Effect of vitamin E supplementation on orthodontic tooth movement in Wistar rats

Erliera Sufarnap; Darmayanti Siregar; Yumi Lindawati

doi:10.12688/f1000research.25709.1

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Research Article

Effect of vitamin E supplementation on orthodontic tooth movement in Wistar rats

[version 1; peer review: 1 approved, 1 not approved]

Erliera Sufarnap ¹, Darmayanti Siregar², Yumi Lindawati³

PUBLISHED 04 Sep 2020

Author details Author details

¹ Department of Orthodontics, Universitas Sumatera Utara, Medan, North Sumatera, 20155, Indonesia
² Department of Dental Public Health, Universitas of Sumatera Utara, Medan, North Sumatera, 20155, Indonesia
³ Department of Oral Biology, Universitas Sumatera Utara, Medan, North Sumatera, 20155, Indonesia

Erliera Sufarnap
Roles: Conceptualization, Data Curation, Formal Analysis, Funding Acquisition, Investigation, Project Administration, Resources, Supervision, Validation

Darmayanti Siregar
Roles: Formal Analysis, Methodology, Software

Yumi Lindawati
Roles: Visualization, Writing – Review & Editing

OPEN PEER REVIEW

REVIEWER STATUS

Abstract

Background: Tooth movement induced by the application of orthodontic force is facilitated by bone remodelling cells and chemical mediators. Vitamin E has anti-inflammatory properties, which helps in suppressing the damaging effects of oxygen free radicals in cells during bone formation. This study aimed to evaluate the effect of vitamin E supplementation on orthodontic tooth movement in Wistar rats.
Methods: Wistar rats (n=56) were divided into two groups. Group 1 served as the control groups, while group 2 was given vitamin E for 14 days before application of orthodontic force. Each group was divided into four subgroups (n=7), corresponding to the number of days orthodontic force lasted, i.e. 0, 1, 3, 7 days. At each of these four time points, distance measurements and quantity of osteoblasts-osteoclasts were measured in each rat.
Results: Tooth movement distance was increased for group 2 than group 1 for all time intervals, but this difference was only statistically different on day 3 (p=0.001). For both groups, tooth movement was significantly different between each time interval in each group (p=0.041). The mean number of osteoblast cells was increased for group 2 compared to group 1 for all time intervals (p<0.05), but was not significant different between time intervals (p=0.897). The number of osteoclasts was not significantly different between groups, but it was statistically different between time intervals (p=0.004).
Conclusion: Present outcomes demonstrate that vitamin E contributes to faster tooth movement compared to control group. It also stimulates more bone formation without reducing the bone resorption.

Keywords

Orthodontic tooth movement, vitamin E, tooth movement distance, osteoblast, osteoclast.

Corresponding author: Erliera Sufarnap

Competing interests: No competing interests were disclosed.

Grant information: This study project is financed by Research Institution of Universitas Sumatera Utara (263/UN5.2.3.1/PPM/KP-TALENTA-USU/2019).
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Copyright: © 2020 Sufarnap E et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

How to cite: Sufarnap E, Siregar D and Lindawati Y. Effect of vitamin E supplementation on orthodontic tooth movement in Wistar rats [version 1; peer review: 1 approved, 1 not approved]. F1000Research 2020, 9:1093 (https://doi.org/10.12688/f1000research.25709.1) First published: 04 Sep 2020, 9:1093 (https://doi.org/10.12688/f1000research.25709.1) Latest published: 07 Dec 2020, 9:1093 (https://doi.org/10.12688/f1000research.25709.3)

Introduction

Tooth movement is induced by the application of orthodontic force characterized by bone and periodontal tissue remodelling. Orthodontic force also alters periodontal tissue vascularity and blood flow, resulting in the local synthesis and release of various molecules such as neurotransmitters, cytokines, growth factors, colony-stimulating factors and arachidonic acid metabolites¹.

Bone remodelling is a process that enables tooth movement. It involves bone-reabsorption by osteoclasts on the pressure site and bone-formation by osteoblasts on the tension site^2,3. Osteoclasts are multinucleated cells, irregular in shape with a process originating from Howship’s lacunae⁴. They stimulate bone resorption by creating cavities in the bone known as lacunae that will be filled by osteoblast cells³. According to Mavragani et al., the cellular process of osteoclast proliferation has been used as important indicators in evaluating the level of tooth movement⁵. Osteoblasts are mononuclear cells that originate from mesenchymal stem cells in bone marrow. Mature osteoblasts form the osteoid by synthesizing collagen and non-collagen proteins⁶.

According to Burstone in Asiry’s citation, there are three phases of orthodontic tooth movement, which consists the initial, lag and postlag phases⁷. The initial stage of orthodontic tooth movement stimulates an inflammatory response involving cells and blood vessels in periodontal ligaments as well as chemical mediators. In response to mechanical stress caused by the application of orthodontic force, substances such as cytokines and enzymes are released^2,8. Interleukin-1β is a pro-inflammatory cytokine that facilitates fusion and activation of osteoclasts, and encourages early bone resorption⁹.

Studies have shown that vitamin E has anti-inflammatory properties, which helps suppress damaging effects of oxygen free radicals in cells during bone formation¹⁰. Previous studies carried out by Esenlik et al. and Xu et al. suggest that vitamin E supplementation may alter cytokine production; vitamin E supplement maintains normal bone remodelling in young animals and increases bone mass by decreasing the concentration of free radicals which suppress bone formation^11,12.

Since orthodontic tooth movement is facilitated by bone remodelling cells and chemical mediators, it is possible to hypothesize that vitamin E has a positive effect on bone remodelling cells, which is crucial to tooth movement. However, it is unknown if vitamin would accelerate the movement or inhibit tooth movement. The purpose of this study was to evaluate the effect of vitamin E supplementation on orthodontic tooth movement in Wistar rats. Mice and rats are mammals that have a reasonably comparable metabolism to humans, which can be used for biological-cellular mechanism analysis in orthodontic tooth movement¹³.

Methods

Animals

This article was reported in line with the ARRIVE guidelines. The study was an in-vivo quasi experiment, which was approved by the Animal Research Ethics Committee, Department of Biology - Faculty of Mathematics and Science, Universitas Sumatera Utara (No. 0128/KEPH-FMIPA/2019).

A total of 56 healthy male, four to five-months old, Wistar rats, weighing 150–250 grams, were used in this study. The Wistar Rats came from the same breeding farm (Deli Serdang, North Sumatera, Indonesia) in two cycles.

The rats were adapted to their environment for 7 days before the experiment start. They were nurtured at the Animal House at Faculty of Mathematics and Science, Universitas Sumatera Utara in polycarbonate cage, which measured 480 mm × 265 mm × 210 mm. Each cage had wood shavings on the floor, and contained 3 or 4 animals, which were marked for each subgroup. Rats were chosen for each group by simple random sampling.

Low light to dark cycle was maintained for a minimum 12 hours at 25–30°C for room temperature within the experiment period. The rats were given a standard pellet diet. All conditions served to produce the optimum condition of the rats’ habitat¹⁴. A rubber separator was inserted between maxillae’s incisors to produce non-invasive experiments. Anaesthetic was used to euthanize the rats at the end of the experimental procedure.

Experiment

Wistar rats (n=56) were divided into two groups. Each group was then divided into four subgroups (n=7), corresponding to the number of the days orthodontic force lasted, i.e. 0, 1, 3, 7 days. The sample size of each subgroup was decided by Sastroasmoro and Ismael’s formula for hypothetical analysis between independent variables¹⁵.

Subgroups were chosen based on the rats’ social behaviours. Hyperactive rats were chosen to be in the same cage, separately to rats with a more passive behaviour. These conditions avoided any anxiety social-related behaviour between rats in the cage within the experiment. For each experiment, a researcher who was blind to the experiment chose a sample randomly from each cage.

Group 1 were the control group and were given water orally as a placebo. The rats’ tail was marked with black pen. Group 2 were the experimental group and were given vitamin E (dl-α-Tocopheryl Acetate; Sanbe, Indonesia) at a dosage of 60 mg/kg, orally using gavage needle. The group 2 rats’ tail marked with red pen.

Water and vitamin E were given every day at 8am, for 14 days before and continued after application of orthodontic force. After 14 days, orthodontic force was applied to each rat in both groups by addition of a rubber separator to one of the maxilla incisors (Figure 1A). This administration of orthodontic force applied were carried out before daily water and vitamin E feeding. This procedure counted as the baseline time of the experiment. At each of these four time points distance measurements and quantity of osteoblasts-osteoclasts were measured (see section below).

Figure 1.

(A) Rat separator; (B) Distance measurement; (C) Microscopic of whole teeth at 40x magnification. Lines, Yellow=teeth; Green=periodontal ligament; Red=alveolar bone. Arrows, Blue=pressure side; Green=tension side.

At end of each experiment period, the dosage of ketamine® at 80mg/kg of body weight and xyla® (Interchemie, Holland) at 10mg/kg of body weight was used to euthanised each rat by cardiac puncture methods for further research with blood analysis.

Outcomes

Tooth movement was measured using a digital calliper (Mitutoyo, Japan) was used to measure the distance between maxilla incisors at mesial cervical (Moorrees method) immediately after removal of the rubber separator (Figure 1B)¹⁶.

The pre-maxillae were dissected and fixated in 10% formalin for 24h, and decalcified with rapid-decalsifier, Nitric acid 10% (Aurona Scientific, Singapore) for 10-14 days. The embedded blocks were trimmed using a Leica microtome (Leica, Germany) into 5µm sections. Histological sections were stained with haematoxylin-eosin and were examined using Olympus CX21 light microscope at 400x magnification to analyse the number of cells within five fields of view for each measurement. A pressured site exhibited as a narrow area between teeth and alveolar bone where the tooth tended to move, and this site was used for osteoclast analysis. A tension site exhibited as a wide area between teeth and alveolar bone where the tooth was left out, and this site was used for osteoblast analysis (Figure 1C).

Statistical analysis

IBM-SPSS (Statistical Package for Social Sciences), version 26.0, was used for statistical analysis. Independent t-test and Mann-Whitney test were used to analyse the difference between the two main groups. General Linear Model-Repeated Measures (ANOVA GLM-RM) and Friedman analysis were used to analyse the difference between time intervals. Significant differences were determined at p<0.05.

Results

Tooth movement distances were greater in group 2 compared to group 1 at each time point (Table 1). This difference was only statistically significant on day 3 (p=0.001). For both groups, tooth movement was significantly different between each time interval in each group (p=0.041). After day 3, movement for group 1 reduced, while for group 2, this continued to increase until day 7.

Table 1. Comparison of tooth movement distance between Group 1 (control) and group 2 (vitamin E treatment) (n=7/subgroup (day)).

Data are presented as mean±SD.

Day	Tooth movement (mm)		P value^a	P value^b
Day	Group 1	Group 2	P value^a	P value^b
0	0.00±0.00	0.00±000	Baseline	0.041
1	0.25±0.05	0.31±0.13	0.486
3	0.22±0.12	0.50±0.11	0.001
7	0.37±0.20	0.55±0.22	0.1373

p<0.05 – statistically significant. ^aIndependent t-test; ^bANOVA GLM-RM

The number of osteoblasts in group 2 were higher compared with group 1 at each time point (Figure 2A and B; Table 2). These differences were statistically significant (p<0.05). Group 2 showed increased osteoblasts starting from day 0 to day 3, while group 1 had decreased osteoblast after day 3.

Figure 2. Osteoblasts and osteoclasts in rat alveolar bone at 400x magnification.

(A) osteoblasts in group 1 (control); (B) osteoblasts in group 2 (vitamin E treatment); (C) osteoclasts in group 1; (D) osteoclasts in a Howship’s lacuna in group 2.

Table 2. Comparison of number of osteoblasts between Group 1 (control) and group 2 (vitamin E treatment) (n=7/subgroup (day)).

Data are presented as mean±SD.

Day	Number of osteoblasts (n)		P value^a	P value^b
Day	Group 1	Group 2	P value^a	P value^b
0	5.14±1.34	9.21±3.21	0.012	0.001
1	5.29±1.71	9.36±2.38	0.003
3	3.86±1.94	10.14±3.53	0.004
7	5.04±0.95	8.43±1.02	0.002

p<0.05 – statistically significant. ^aMann-Whitney test; ^bFriedman analysis

The number of osteoclasts in group 2 were higher than group 1 except on day 1, but the differences were not significant statistically (Figure 2C and D; Table 3).

Table 3. Comparison of number of osteoclasts between Group 1 (control) and group 2 (vitamin E treatment) (n=7/subgroup (day)).

Data are presented as mean±SD.

Day	Number of osteoclasts (n)		P value^a	P value^b
Day	Group 1	Group 2	P value^a	P value^b
0	0.89±0.48	1.18±0.47	0.393	0.016
1	1.86±0.93	1.79±0.77	0.797
3	1.07±0.91	1.68±0.67	0.109
7	1.82±1.01	2.18±0.93	0.172

p<0.05 – statistically significant. ^aMann-Whitney test; ^bFriedman analysis

Discussion

Orthodontic force causes gradual compression on the periodontal ligament, which leads to circulatory disorders, such as ischemia and hypoxia in the early stage of orthodontic tooth movement¹⁷. Hypoxia and compression caused by orthodontic force stimulate the production of reactive oxygen species and free radicals, which contribute to cellular and tissue damage, especially damaging lipid peroxidation chains¹⁸. Vitamin E is a strong biological antioxidant that has several functions: scavenges free radicals, which inhibit lipid peroxidation and inflammation; protects ischemic tissue and hypoxia; provides immunostimulation^11,19. Norazlina et al. observed the effect of vitamin E supplementation on bone metabolism in mice treated with nicotine. Their study results suggested that vitamin E can increase trabecular bone formation and prevent bone calcium loss by reducing pro-inflammatory cytokines²⁰.

In the present study, it can be seen that both groups showed increased tooth movement distance as well as increase in the number of osteoclast and osteoblast cells on day 1. This is due to the initial phase of tooth movement after application of orthodontic force²¹. This phase occurs 24 hours to 48 hours after application of orthodontic force on teeth³.

Our results showed that the number of osteoclasts is higher in group 2 compared to group 1 although the difference was not statistically significant. Miresmaeili et al., in their study on the effect of vitamin C to orthodontic tooth movement, found that osteoclast numbers were significantly higher in the vitamin C group, which hence accelerates tooth movement²². Kale et al., in their research on vitamin D injection, observed a significant amount of Howhip’s lacunae in resorption cavity as a result of osteoclast’s activity²³. Future research is required to observe the comparison between Howship’s lacunae and osteoclasts numbers.

In our study, there were statistically significant differences in the mean number of osteoblast cells between both groups at each time observed. Kawakami and Takano-Yamamoto demonstrated an increased osteoclast and osteoblast number with local injection of 1,25-dihydroxyvitamin D3 in the submucosal palatal area of rats subjected to tooth movement on day 7. Increased osteoblast counts were observed on day 14^19,24. In another study, Feresin et al. reported that the formation rate and bone volume increased significantly by 65% in rat bone, who were given a vitamin E diet compared to the control group. Their result indicated that a vitamin E diet was able to increase the process of mineralization and bone formation mediated by osteoblast cells²⁵. Diravidamani et al. stated that many drugs that are used to reduce pain had effects on orthodontic tooth movement. Further research should be done to observe vitamin E on pain regulation, because it has anti-inflammatory effect, which is assumed to reduce pain in orthodontic treatment^10,26–28.

The force mechanism from the separator used in our study was static and the elasticity from the separator is easily lost due to saliva acidity (pH), food and chewing process; a the force of a rubber separator will be reduced by 50–55% within 24 hours²⁹. This is a limitation of our study, as we wanted to analyse for a longer time and with a larger force. The aim of our study was to see the orthodontic tooth movement and not stabilization, so we decided to observe the orthodontic movement within the initial phase, and not all phases until the stabilization phase.

Conclusions

Our findings demonstrated that vitamin E accelerates tooth movement and stimulates bone formation. The number of osteoblast cells in the vitamin E supplemented group is significantly higher than those in the non-vitamin E group. Further studies are needed to evaluate the effect of different doses and types of vitamin E.

Data availability

Underlying data

Open Science Framework: Methods, Figures, and Results from "Effect of Vitamin E Supplementation on Orthodontic Tooth Movement in Wistar Rats, https://doi.org/10.17605/OSF.IO/3S4QB³⁰.

Reporting guidelines

Open Science Framework: ARRIVE checklist for ‘Effect of vitamin E supplementation on orthodontic tooth movement in Wistar rats’, https://doi.org/10.17605/OSF.IO/3S4QB³⁰.

Data are available under the terms of the Creative Commons Attribution 4.0 International license (CC-BY 4.0).

Faculty Opinions recommended

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Comments on this article Comments (0)

Version 3

VERSION 3 PUBLISHED 04 Sep 2020

Author details Author details

Erliera Sufarnap
Roles: Conceptualization, Data Curation, Formal Analysis, Funding Acquisition, Investigation, Project Administration, Resources, Supervision, Validation

Darmayanti Siregar
Roles: Formal Analysis, Methodology, Software

Yumi Lindawati
Roles: Visualization, Writing – Review & Editing

Competing interests

No competing interests were disclosed.

Grant information

This study project is financed by Research Institution of Universitas Sumatera Utara (263/UN5.2.3.1/PPM/KP-TALENTA-USU/2019).
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Article Versions (3)

version 3

Revised

Published: 07 Dec 2020, 9:1093

https://doi.org/10.12688/f1000research.25709.3

version 2

Revised

Published: 15 Oct 2020, 9:1093

https://doi.org/10.12688/f1000research.25709.2

version 1

Published: 04 Sep 2020, 9:1093

https://doi.org/10.12688/f1000research.25709.1

© 2020 Sufarnap E et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Sufarnap E, Siregar D and Lindawati Y. Effect of vitamin E supplementation on orthodontic tooth movement in Wistar rats [version 1; peer review: 1 approved, 1 not approved]. F1000Research 2020, 9:1093 (https://doi.org/10.12688/f1000research.25709.1)

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Reviewer Report 25 Sep 2020

Hiroyuki Kanzaki, Maxillo-oral Disorders, Tohoku University Hospital, Sendai, Japan; Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan

Not Approved

https://doi.org/10.5256/f1000research.28373.r71955

In this manuscript, the authors examined the effect of vitamin E (VE) supplementation on orthodontic tooth movement (OTM). They found that VE augmented OTM only at day-3. The number of osteoblasts was increased by VE at any time point, though the number of osteoclasts was stable irrespective of VE. This manuscript seems at the development stage, and there are some concerns and they are discussed below.

Major:

Increased osteoblast at day 0 in group-2.
Why was there a statistically significant difference on day-0?
Model of OTM
The reviewer felt that the model the authors used is not suitable for the model of OTM, due to excessive heavy force by elastic separation band. Other models such as the use of super-elastic coil spring between molar and incisor would be suitable.

Minor:

Please add the scale in figure 2.
Vitamin E dosage
Please describe how the authors decided the dose of vitamin E in this experiment.

Is the work clearly and accurately presented and does it cite the current literature?

No
Is the study design appropriate and is the work technically sound?

No
Are sufficient details of methods and analysis provided to allow replication by others?

No
If applicable, is the statistical analysis and its interpretation appropriate?

Partly
Are all the source data underlying the results available to ensure full reproducibility?

Partly
Are the conclusions drawn adequately supported by the results?

Partly

Competing Interests: No competing interests were disclosed.

Reviewer Expertise: bone biology

I confirm that I have read this submission and believe that I have an appropriate level of expertise to state that I do not consider it to be of an acceptable scientific standard, for reasons outlined above.

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Author Response 15 Oct 2020

Erliera Sufarnap, Department of Orthodontics, Universitas Sumatera Utara, Medan, 20155, Indonesia

15 Oct 2020

Author Response

Dear, Assoc. Prof. Hiroyuki Kanzaki, Maxillo-oral Disorders, Yohoku University Hospital, Sendai, Japan

Thank you for your kind attention and assistance in reviewing our manuscript with the precious advices for ... Continue reading Dear, Assoc. Prof. Hiroyuki Kanzaki, Maxillo-oral Disorders, Yohoku University Hospital, Sendai, Japan

Thank you for your kind attention and assistance in reviewing our manuscript with the precious advices for the manuscript and our further research. We have revised the manuscript according to some inquiries you have been suggested. The following are our comprehensive comments to the review after revised.

Major :

1. “In this manuscript, the authors examined the effect of VE supplementation on OTM. They found that VE augmented OTM only at day 3”.
     Comment : The distance measurement showed that the distance of the group 2 (VE) seemed wider for all time point of observation, but unfortunately we found significantly difference only on day 3 since the initial phase was happened within this period of time.

2. “The number of osteoblasts was increased by VE at any time point since the baseline time (day-0)”
     Comment : VE already intervened 14 days prior the orthodontic separator insertion based on McGavin et al. study ²⁴. The authors wanted to observe the OTM after the VE circulated to the rats body since VE is one of the regular vitamin to be intake daily.

3. “This manuscript seems at the development stage and there are some concerns suppose to be discussed below”
     Comment : Yes Indeed, we discuss this is as our limitation of the study on the discussion chapter, moreover we added the Title of this manuscript become “A preliminary study”.

4. Model of OTM: “The reviewer felt that the model the authors used is not suitable for the model of OTM, due to excessive heavy force by elastic separation band. Other models such as the use of super-elastic coil spring between molar and incisor would be suitable”.
     Comment : Yes Indeed. For further research we should effort ourself to have more controllable and continuously force of the mechanic. We thank you again for this valuable insight and definitely we will be consider in our future works.

Minor:
1. Please add the scale in figure 2
     Comment : The Olympus CX21 light microscope we used did not have any scale bar and so that the slide we used. We were sorry for our laboratory limitation. I have tried so hard to put in to ImageJ and converted it, but still it could not be processed properly. So, still I couldn’t give the answer your inquiry.
2. VE dosage
Comment : We have edited and added to the experiment chapter

We thank you again for your kindness for the established and valuable insight of the reviews.

Dear, Assoc. Prof. Hiroyuki Kanzaki, Maxillo-oral Disorders, Yohoku University Hospital, Sendai, Japan

Thank you for your kind attention and assistance in reviewing our manuscript with the precious advices for the manuscript and our further research. We have revised the manuscript according to some inquiries you have been suggested. The following are our comprehensive comments to the review after revised.

Major :

1. “In this manuscript, the authors examined the effect of VE supplementation on OTM. They found that VE augmented OTM only at day 3”.
     Comment : The distance measurement showed that the distance of the group 2 (VE) seemed wider for all time point of observation, but unfortunately we found significantly difference only on day 3 since the initial phase was happened within this period of time.

2. “The number of osteoblasts was increased by VE at any time point since the baseline time (day-0)”
     Comment : VE already intervened 14 days prior the orthodontic separator insertion based on McGavin et al. study ²⁴. The authors wanted to observe the OTM after the VE circulated to the rats body since VE is one of the regular vitamin to be intake daily.

3. “This manuscript seems at the development stage and there are some concerns suppose to be discussed below”
     Comment : Yes Indeed, we discuss this is as our limitation of the study on the discussion chapter, moreover we added the Title of this manuscript become “A preliminary study”.

4. Model of OTM: “The reviewer felt that the model the authors used is not suitable for the model of OTM, due to excessive heavy force by elastic separation band. Other models such as the use of super-elastic coil spring between molar and incisor would be suitable”.
     Comment : Yes Indeed. For further research we should effort ourself to have more controllable and continuously force of the mechanic. We thank you again for this valuable insight and definitely we will be consider in our future works.

Minor:
1. Please add the scale in figure 2
     Comment : The Olympus CX21 light microscope we used did not have any scale bar and so that the slide we used. We were sorry for our laboratory limitation. I have tried so hard to put in to ImageJ and converted it, but still it could not be processed properly. So, still I couldn’t give the answer your inquiry.
2. VE dosage
Comment : We have edited and added to the experiment chapter

We thank you again for your kindness for the established and valuable insight of the reviews.

Competing Interests: No competing interest were disclosed Close
Report a concern
Respond or Comment

COMMENTS ON THIS REPORT

Author Response 15 Oct 2020

Erliera Sufarnap, Department of Orthodontics, Universitas Sumatera Utara, Medan, 20155, Indonesia

15 Oct 2020

Author Response

Dear, Assoc. Prof. Hiroyuki Kanzaki, Maxillo-oral Disorders, Yohoku University Hospital, Sendai, Japan

Thank you for your kind attention and assistance in reviewing our manuscript with the precious advices for ... Continue reading Dear, Assoc. Prof. Hiroyuki Kanzaki, Maxillo-oral Disorders, Yohoku University Hospital, Sendai, Japan

Thank you for your kind attention and assistance in reviewing our manuscript with the precious advices for the manuscript and our further research. We have revised the manuscript according to some inquiries you have been suggested. The following are our comprehensive comments to the review after revised.

Major :

1. “In this manuscript, the authors examined the effect of VE supplementation on OTM. They found that VE augmented OTM only at day 3”.
     Comment : The distance measurement showed that the distance of the group 2 (VE) seemed wider for all time point of observation, but unfortunately we found significantly difference only on day 3 since the initial phase was happened within this period of time.

2. “The number of osteoblasts was increased by VE at any time point since the baseline time (day-0)”
     Comment : VE already intervened 14 days prior the orthodontic separator insertion based on McGavin et al. study ²⁴. The authors wanted to observe the OTM after the VE circulated to the rats body since VE is one of the regular vitamin to be intake daily.

3. “This manuscript seems at the development stage and there are some concerns suppose to be discussed below”
     Comment : Yes Indeed, we discuss this is as our limitation of the study on the discussion chapter, moreover we added the Title of this manuscript become “A preliminary study”.

4. Model of OTM: “The reviewer felt that the model the authors used is not suitable for the model of OTM, due to excessive heavy force by elastic separation band. Other models such as the use of super-elastic coil spring between molar and incisor would be suitable”.
     Comment : Yes Indeed. For further research we should effort ourself to have more controllable and continuously force of the mechanic. We thank you again for this valuable insight and definitely we will be consider in our future works.

Minor:
1. Please add the scale in figure 2
     Comment : The Olympus CX21 light microscope we used did not have any scale bar and so that the slide we used. We were sorry for our laboratory limitation. I have tried so hard to put in to ImageJ and converted it, but still it could not be processed properly. So, still I couldn’t give the answer your inquiry.
2. VE dosage
Comment : We have edited and added to the experiment chapter

We thank you again for your kindness for the established and valuable insight of the reviews.

Dear, Assoc. Prof. Hiroyuki Kanzaki, Maxillo-oral Disorders, Yohoku University Hospital, Sendai, Japan

Thank you for your kind attention and assistance in reviewing our manuscript with the precious advices for the manuscript and our further research. We have revised the manuscript according to some inquiries you have been suggested. The following are our comprehensive comments to the review after revised.

Major :

1. “In this manuscript, the authors examined the effect of VE supplementation on OTM. They found that VE augmented OTM only at day 3”.
     Comment : The distance measurement showed that the distance of the group 2 (VE) seemed wider for all time point of observation, but unfortunately we found significantly difference only on day 3 since the initial phase was happened within this period of time.

2. “The number of osteoblasts was increased by VE at any time point since the baseline time (day-0)”
     Comment : VE already intervened 14 days prior the orthodontic separator insertion based on McGavin et al. study ²⁴. The authors wanted to observe the OTM after the VE circulated to the rats body since VE is one of the regular vitamin to be intake daily.

3. “This manuscript seems at the development stage and there are some concerns suppose to be discussed below”
     Comment : Yes Indeed, we discuss this is as our limitation of the study on the discussion chapter, moreover we added the Title of this manuscript become “A preliminary study”.

4. Model of OTM: “The reviewer felt that the model the authors used is not suitable for the model of OTM, due to excessive heavy force by elastic separation band. Other models such as the use of super-elastic coil spring between molar and incisor would be suitable”.
     Comment : Yes Indeed. For further research we should effort ourself to have more controllable and continuously force of the mechanic. We thank you again for this valuable insight and definitely we will be consider in our future works.

Minor:
1. Please add the scale in figure 2
     Comment : The Olympus CX21 light microscope we used did not have any scale bar and so that the slide we used. We were sorry for our laboratory limitation. I have tried so hard to put in to ImageJ and converted it, but still it could not be processed properly. So, still I couldn’t give the answer your inquiry.
2. VE dosage
Comment : We have edited and added to the experiment chapter

We thank you again for your kindness for the established and valuable insight of the reviews.

Competing Interests: No competing interest were disclosed Close
Report a concern

Views

Reviewer Report 09 Sep 2020

Ananto Ali Alhasyimi, Department of Orthodontics, Faculty of Dentistry, Gadjah Mada University (UGM), Yogyakarta, Indonesia

Approved

https://doi.org/10.5256/f1000research.28373.r70989

It’s been an honor for us to review the manuscripts. First of all, please allow me to congratulate the authors for endeavoring to undertake this study which I found very interesting and valuable as a recommendation for further study in the orthodontics field especially in the acceleration of orthodontic tooth movement area. We have been reviewing throughout the manuscript. The following are our comments related to the manuscript.

General Comment:

The title and topic are quite interesting for journal scope and discover a novelty especially for developing natural materials to accelerate orthodontic tooth movement.
Paper is well-organized and easy to follow.
To improve the readability, It is recommended that the text is given an English language edit as many of the sentences might be misunderstood and some of typos were found. I suggest a revision of the English grammar structures by an expert editor in revising manuscripts.

Abstract:

The author mentioned: “Tooth movement induced by the application of orthodontic force is facilitated by bone remodeling cells and chemical mediators. Vitamin E has anti-inflammatory properties, which helps in suppressing the damaging effects of oxygen free radicals in cells during bone formation”. As we know that inflammation is a part of the orthodontic tooth movement, so it is better to find another logic to connect the reason for using Vitamin E in this study.
It stated: “Conclusion: Present outcomes demonstrate that vitamin E contributes to faster tooth movement compared to control group. It also stimulates more bone formation without reducing the bone resorption”. The author only evaluates the osteoclast and osteoblast number and did not analyze bone formation nor bone resorption indicator. It is better to write a conclusion based on what the author did.

Introduction:

At the end of the introduction part please add some of the hypotheses.

Methods:

Author used healthy male Wistar ratsà what is the rationale? Please explain shortly in the manuscript.
A dosage of 60 mg/kg Vitamin E was used in this study, what is the rationale? Please explain shortly in the manuscript.
Authors have chosen HE staining for labeling osteoclast and osteoblast number but did not use any specific marker for osteoblasts (e.g. Von-kossa or Alkaline phosphatase.) and osteoclast (TRAP), rather relied on visual analyses and counting of cells. This method of counting cells is somewhat arbitrary. There are a number of markers available for osteoblasts – osteoclasts using these biomarkers will strengthen this study.
Author should add the special characteristic of osteoclast-osteoblast (e.g. osteoblast was demonstrated as a cuboidal shape cell, characterized by a single, large, deep blue-purple nuclei, and found on the edge surfaces of alveolar bone) to minimize the bias and add the region of interest (ROI) since ROI is the key element in both number counts and distribution. Therefore, it is of utmost importance to show where were these ROIs.
A blinded evaluator was responsible for determination of the score and had undergone a training exercise involving the calculation of the Kappa coefficient for the determination of intra-examiner agreement, what about the result? Please write it whether it is satisfactory or not.

Results

General results were not reported. What happens with the general health of the animal during the administration of Vitamin E (e.g.general toxicity, edema, deaths affect the body weight of animals?)

Discussion

Fairly well written with minor typographical errors.

Conclusion

The author only evaluates the osteoclast and osteoblast number and did not analyze bone formation nor bone resorption indicator. It is better to write a conclusion based on what the author did.

Is the work clearly and accurately presented and does it cite the current literature?

Yes
Is the study design appropriate and is the work technically sound?

Yes
Are sufficient details of methods and analysis provided to allow replication by others?

Yes
If applicable, is the statistical analysis and its interpretation appropriate?

Yes
Are all the source data underlying the results available to ensure full reproducibility?

Yes
Are the conclusions drawn adequately supported by the results?

Partly

Competing Interests: No competing interests were disclosed.

Reviewer Expertise: orthodontic biomaterials

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard.

CITE

Report a concern

Author Response 15 Oct 2020

Erliera Sufarnap, Department of Orthodontics, Universitas Sumatera Utara, Medan, 20155, Indonesia

15 Oct 2020

Author Response
Dear Dr Ananto Ali Alhasyimi, Universitas Gadjah Mada, Sleman, Indonesia
Thank you for your kind assistance in reviewing our manuscript becoming very marvelous manuscript with your advices at many chapters. We have ... Continue reading
Dear Dr Ananto Ali Alhasyimi, Universitas Gadjah Mada, Sleman, Indonesia
Thank you for your kind assistance in reviewing our manuscript becoming very marvelous manuscript with your advices at many chapters. We have revised the manuscript according to some inquiries you have been suggested. Finally we add the title become ‘A preliminary study’ which suppose to be our limitation of this research and would be continue to further research which we mentioned on discussion part. Several additional references already provided to consolidated theories which were needed. The following are our comprehensive comments to the review after revised.

Abstract

“As we know that inflammation is a part of the orthodontic tooth movement, so it is better to find another logic to connect the reason for using Vitamin E in this study”.

: We have edited the reason of using VE in this study

The author only evaluates the osteoclast and osteoblast number and did not analyze bone formation nor bone resorption indicator. It is better to write a conclusion based on what the author did.

: We have edited the conclusion based on the variables we observed without any other conclusion.

2. Introduction : “  At the end of the introduction part please add some of the hypotheses”.
   Comment : We have edited our hypothesize more pointedly.

3. Methods :
a. “Author used healthy male Wistar rats what is the rationale? Please explain    shortly in the manuscript.”
     Comment : We were sorry, we’ve missed the detail to explain why. We edited and gave a reason that VE able to modulate the estrogen (hormone) and a reference had been added to strengthen this reason.
b. “A dosage of 60 mg/kg Vitamin E was used in this study, what is the rationale? Please
explain shortly in the manuscript.
Comment : The dose chosen was based on a research that had been done by Nur Azlina et al. ¹⁷_.
c. “There are a number of markers available for osteoblasts – osteoclasts using these biomarkers will strengthen this study”.
     Comment : We mentioned changes in the title and discussion chapter as our limitations of the study
d.  Author should add the special characteristic of osteoclast-osteoblast to minimize the bias and add the region of interest (ROI) since ROI is the key element in both number counts and distribution. Therefore, it is of utmost importance to show where were these ROIs.
     Comment :  Thank you Doctor, We completed and added additional references to mention about the characteristic of osteoblasit and osteoclast and expalained about the specific ROI.
e.  A blinded evaluator was responsible for determination of the score and had undergone a training exercise involving the calculation of the Kappa coefficient for the determination of intra-examiner agreement, what about the result? Please write it whether it is satisfactory or not.
     Comment : To be honest, the level for IRR results have not very satisfactory result. The observer decided to use the “main value” from both raters as the datas to be analysed. And we also editted and added this results as our limitation of the study at the discussion chapter.

4. Results : General results were not reported. What happens with the general health of the animal during the administration of Vitamin E (e.g.general toxicity, edema, deaths affect the body weight of animals?)
     Comment : We have edited this inquiry to the result’s chapter.

5. Discussion : “Fairly well written with minor typographical errors”.
     Comment  : Thank you for the review and we already rechecked and changed.

6. Conclusion :  “The author only evaluates the osteoclast and osteoblast number and did not analyze bone formation nor bone resorption indicator. It is better to write a conclusion based on what the author did”.
     Comment : We have edited the conclusion based on the variables we observed without any
     other conclusion.

Thank you for the established reviews and the valuable insight for our manuscript.
Dear Dr Ananto Ali Alhasyimi, Universitas Gadjah Mada, Sleman, Indonesia
Thank you for your kind assistance in reviewing our manuscript becoming very marvelous manuscript with your advices at many chapters. We have revised the manuscript according to some inquiries you have been suggested. Finally we add the title become ‘A preliminary study’ which suppose to be our limitation of this research and would be continue to further research which we mentioned on discussion part. Several additional references already provided to consolidated theories which were needed. The following are our comprehensive comments to the review after revised.

Abstract

“As we know that inflammation is a part of the orthodontic tooth movement, so it is better to find another logic to connect the reason for using Vitamin E in this study”.

: We have edited the reason of using VE in this study

The author only evaluates the osteoclast and osteoblast number and did not analyze bone formation nor bone resorption indicator. It is better to write a conclusion based on what the author did.

: We have edited the conclusion based on the variables we observed without any other conclusion.

2. Introduction : “  At the end of the introduction part please add some of the hypotheses”.
   Comment : We have edited our hypothesize more pointedly.

3. Methods :
a. “Author used healthy male Wistar rats what is the rationale? Please explain    shortly in the manuscript.”
     Comment : We were sorry, we’ve missed the detail to explain why. We edited and gave a reason that VE able to modulate the estrogen (hormone) and a reference had been added to strengthen this reason.
b. “A dosage of 60 mg/kg Vitamin E was used in this study, what is the rationale? Please
explain shortly in the manuscript.
Comment : The dose chosen was based on a research that had been done by Nur Azlina et al. ¹⁷_.
c. “There are a number of markers available for osteoblasts – osteoclasts using these biomarkers will strengthen this study”.
     Comment : We mentioned changes in the title and discussion chapter as our limitations of the study
d.  Author should add the special characteristic of osteoclast-osteoblast to minimize the bias and add the region of interest (ROI) since ROI is the key element in both number counts and distribution. Therefore, it is of utmost importance to show where were these ROIs.
     Comment :  Thank you Doctor, We completed and added additional references to mention about the characteristic of osteoblasit and osteoclast and expalained about the specific ROI.
e.  A blinded evaluator was responsible for determination of the score and had undergone a training exercise involving the calculation of the Kappa coefficient for the determination of intra-examiner agreement, what about the result? Please write it whether it is satisfactory or not.
     Comment : To be honest, the level for IRR results have not very satisfactory result. The observer decided to use the “main value” from both raters as the datas to be analysed. And we also editted and added this results as our limitation of the study at the discussion chapter.

4. Results : General results were not reported. What happens with the general health of the animal during the administration of Vitamin E (e.g.general toxicity, edema, deaths affect the body weight of animals?)
     Comment : We have edited this inquiry to the result’s chapter.

5. Discussion : “Fairly well written with minor typographical errors”.
     Comment  : Thank you for the review and we already rechecked and changed.

6. Conclusion :  “The author only evaluates the osteoclast and osteoblast number and did not analyze bone formation nor bone resorption indicator. It is better to write a conclusion based on what the author did”.
     Comment : We have edited the conclusion based on the variables we observed without any
     other conclusion.

Thank you for the established reviews and the valuable insight for our manuscript.
Competing Interests: No competing interest were disclosed Close
Report a concern
Respond or Comment

COMMENTS ON THIS REPORT

Author Response 15 Oct 2020

Erliera Sufarnap, Department of Orthodontics, Universitas Sumatera Utara, Medan, 20155, Indonesia

15 Oct 2020

Author Response
Dear Dr Ananto Ali Alhasyimi, Universitas Gadjah Mada, Sleman, Indonesia
Thank you for your kind assistance in reviewing our manuscript becoming very marvelous manuscript with your advices at many chapters. We have ... Continue reading
Dear Dr Ananto Ali Alhasyimi, Universitas Gadjah Mada, Sleman, Indonesia
Thank you for your kind assistance in reviewing our manuscript becoming very marvelous manuscript with your advices at many chapters. We have revised the manuscript according to some inquiries you have been suggested. Finally we add the title become ‘A preliminary study’ which suppose to be our limitation of this research and would be continue to further research which we mentioned on discussion part. Several additional references already provided to consolidated theories which were needed. The following are our comprehensive comments to the review after revised.

Abstract

“As we know that inflammation is a part of the orthodontic tooth movement, so it is better to find another logic to connect the reason for using Vitamin E in this study”.

: We have edited the reason of using VE in this study

The author only evaluates the osteoclast and osteoblast number and did not analyze bone formation nor bone resorption indicator. It is better to write a conclusion based on what the author did.

: We have edited the conclusion based on the variables we observed without any other conclusion.

2. Introduction : “  At the end of the introduction part please add some of the hypotheses”.
   Comment : We have edited our hypothesize more pointedly.

3. Methods :
a. “Author used healthy male Wistar rats what is the rationale? Please explain    shortly in the manuscript.”
     Comment : We were sorry, we’ve missed the detail to explain why. We edited and gave a reason that VE able to modulate the estrogen (hormone) and a reference had been added to strengthen this reason.
b. “A dosage of 60 mg/kg Vitamin E was used in this study, what is the rationale? Please
explain shortly in the manuscript.
Comment : The dose chosen was based on a research that had been done by Nur Azlina et al. ¹⁷_.
c. “There are a number of markers available for osteoblasts – osteoclasts using these biomarkers will strengthen this study”.
     Comment : We mentioned changes in the title and discussion chapter as our limitations of the study
d.  Author should add the special characteristic of osteoclast-osteoblast to minimize the bias and add the region of interest (ROI) since ROI is the key element in both number counts and distribution. Therefore, it is of utmost importance to show where were these ROIs.
     Comment :  Thank you Doctor, We completed and added additional references to mention about the characteristic of osteoblasit and osteoclast and expalained about the specific ROI.
e.  A blinded evaluator was responsible for determination of the score and had undergone a training exercise involving the calculation of the Kappa coefficient for the determination of intra-examiner agreement, what about the result? Please write it whether it is satisfactory or not.
     Comment : To be honest, the level for IRR results have not very satisfactory result. The observer decided to use the “main value” from both raters as the datas to be analysed. And we also editted and added this results as our limitation of the study at the discussion chapter.

4. Results : General results were not reported. What happens with the general health of the animal during the administration of Vitamin E (e.g.general toxicity, edema, deaths affect the body weight of animals?)
     Comment : We have edited this inquiry to the result’s chapter.

5. Discussion : “Fairly well written with minor typographical errors”.
     Comment  : Thank you for the review and we already rechecked and changed.

6. Conclusion :  “The author only evaluates the osteoclast and osteoblast number and did not analyze bone formation nor bone resorption indicator. It is better to write a conclusion based on what the author did”.
     Comment : We have edited the conclusion based on the variables we observed without any
     other conclusion.

Thank you for the established reviews and the valuable insight for our manuscript.
Dear Dr Ananto Ali Alhasyimi, Universitas Gadjah Mada, Sleman, Indonesia
Thank you for your kind assistance in reviewing our manuscript becoming very marvelous manuscript with your advices at many chapters. We have revised the manuscript according to some inquiries you have been suggested. Finally we add the title become ‘A preliminary study’ which suppose to be our limitation of this research and would be continue to further research which we mentioned on discussion part. Several additional references already provided to consolidated theories which were needed. The following are our comprehensive comments to the review after revised.

Abstract

“As we know that inflammation is a part of the orthodontic tooth movement, so it is better to find another logic to connect the reason for using Vitamin E in this study”.

: We have edited the reason of using VE in this study

The author only evaluates the osteoclast and osteoblast number and did not analyze bone formation nor bone resorption indicator. It is better to write a conclusion based on what the author did.

: We have edited the conclusion based on the variables we observed without any other conclusion.

2. Introduction : “  At the end of the introduction part please add some of the hypotheses”.
   Comment : We have edited our hypothesize more pointedly.

3. Methods :
a. “Author used healthy male Wistar rats what is the rationale? Please explain    shortly in the manuscript.”
     Comment : We were sorry, we’ve missed the detail to explain why. We edited and gave a reason that VE able to modulate the estrogen (hormone) and a reference had been added to strengthen this reason.
b. “A dosage of 60 mg/kg Vitamin E was used in this study, what is the rationale? Please
explain shortly in the manuscript.
Comment : The dose chosen was based on a research that had been done by Nur Azlina et al. ¹⁷_.
c. “There are a number of markers available for osteoblasts – osteoclasts using these biomarkers will strengthen this study”.
     Comment : We mentioned changes in the title and discussion chapter as our limitations of the study
d.  Author should add the special characteristic of osteoclast-osteoblast to minimize the bias and add the region of interest (ROI) since ROI is the key element in both number counts and distribution. Therefore, it is of utmost importance to show where were these ROIs.
     Comment :  Thank you Doctor, We completed and added additional references to mention about the characteristic of osteoblasit and osteoclast and expalained about the specific ROI.
e.  A blinded evaluator was responsible for determination of the score and had undergone a training exercise involving the calculation of the Kappa coefficient for the determination of intra-examiner agreement, what about the result? Please write it whether it is satisfactory or not.
     Comment : To be honest, the level for IRR results have not very satisfactory result. The observer decided to use the “main value” from both raters as the datas to be analysed. And we also editted and added this results as our limitation of the study at the discussion chapter.

4. Results : General results were not reported. What happens with the general health of the animal during the administration of Vitamin E (e.g.general toxicity, edema, deaths affect the body weight of animals?)
     Comment : We have edited this inquiry to the result’s chapter.

5. Discussion : “Fairly well written with minor typographical errors”.
     Comment  : Thank you for the review and we already rechecked and changed.

6. Conclusion :  “The author only evaluates the osteoclast and osteoblast number and did not analyze bone formation nor bone resorption indicator. It is better to write a conclusion based on what the author did”.
     Comment : We have edited the conclusion based on the variables we observed without any
     other conclusion.

Thank you for the established reviews and the valuable insight for our manuscript.
Competing Interests: No competing interest were disclosed Close
Report a concern

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Version 3

VERSION 3 PUBLISHED 04 Sep 2020

Open Peer Review

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Reviewer Reports

	Invited Reviewers
	1	2
Version 3 (revision) 07 Dec 20
Version 2 (revision) 15 Oct 20		read
Version 1 04 Sep 20	read	read

Ananto Ali Alhasyimi, Gadjah Mada University (UGM), Yogyakarta, Indonesia
Hiroyuki Kanzaki, Tohoku University Hospital, Sendai, Japan; Tsurumi University, Yokohama, Japan

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Reviewer Report

16 Views

24 Nov 2020 | for Version 2

Hiroyuki Kanzaki, Maxillo-oral Disorders, Tohoku University Hospital, Sendai, Japan; Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan

16 Views Cite this report Responses(1)

Approved

Thank you for an excellent revision of the manuscript. The reviewer felt that this revised manuscript is appropriate for next step, except for one issue. It is no scale bar at figure 2.
If your lab is performing in vitro assay and has hemotocytometer, you can calibrate the microscope scale by using the hemotocytometer. If your lab has no hemotocytometer, microscope calibration slide would help the calibration. Microscope calibration slide is around $10.00, and not so expensive. I recommend you to set the scale in figure 2 by using microscope calibration slide...

Competing Interests

No competing interests were disclosed.

Reviewer Expertise

bone biology

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard.

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Responses (1)

Author Response

04 Dec 2020

Erliera Sufarnap, Department of Orthodontics, Universitas Sumatera Utara, Medan, 20155, Indonesia

Dear Prof. Hiroyuki Kanzaki;
Maxillo-oral Disorders, Tohoku University Hospital, Sendai, Japan; Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan

We send a thousand thanks, gratitudes and appreciations of your knowledge and advices.
We currently order the microscope calibration scale and the eyepiece graticule for the Olympus microscope. Unfortunately within this pandemic, the university’s laboratorium were closed and some of them switched to ‘other’ function for the pandemic purposes. We were terribly ask for the forgiveness. Soon after we receive the calibration sets or the condition of the lab’s will clear and clean, we try our best to complete it regardless to the unknown of time prediction.
Once again, I apologize for this matter and thanking you so much for the valuable knowledge for our research.

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Competing Interests

No competing interest were disclosed

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Reviewer Report

27 Views

25 Sep 2020 | for Version 1

Hiroyuki Kanzaki, Maxillo-oral Disorders, Tohoku University Hospital, Sendai, Japan; Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan

27 Views Cite this report Responses(1)

Not Approved

Increased osteoblast at day 0 in group-2.
Why was there a statistically significant difference on day-0?
Model of OTM
The reviewer felt that the model the authors used is not suitable for the model of OTM, due to excessive heavy force by elastic separation band. Other models such as the use of super-elastic coil spring between molar and incisor would be suitable.

Minor:

Please add the scale in figure 2.
Vitamin E dosage
Please describe how the authors decided the dose of vitamin E in this experiment.

Is the work clearly and accurately presented and does it cite the current literature?

No
Is the study design appropriate and is the work technically sound?

No
Are sufficient details of methods and analysis provided to allow replication by others?

No
If applicable, is the statistical analysis and its interpretation appropriate?

Partly
Are all the source data underlying the results available to ensure full reproducibility?

Partly
Are the conclusions drawn adequately supported by the results?

Partly

Competing Interests

No competing interests were disclosed.

Reviewer Expertise

bone biology

Respond to this report

Responses (1)

Author Response

15 Oct 2020

Erliera Sufarnap, Department of Orthodontics, Universitas Sumatera Utara, Medan, 20155, Indonesia

Dear, Assoc. Prof. Hiroyuki Kanzaki, Maxillo-oral Disorders, Yohoku University Hospital, Sendai, Japan

Thank you for your kind attention and assistance in reviewing our manuscript with the precious advices for the manuscript and our further research. We have revised the manuscript according to some inquiries you have been suggested. The following are our comprehensive comments to the review after revised.

Major :

1. “In this manuscript, the authors examined the effect of VE supplementation on OTM. They found that VE augmented OTM only at day 3”.
     Comment : The distance measurement showed that the distance of the group 2 (VE) seemed wider for all time point of observation, but unfortunately we found significantly difference only on day 3 since the initial phase was happened within this period of time.

2. “The number of osteoblasts was increased by VE at any time point since the baseline time (day-0)”
     Comment : VE already intervened 14 days prior the orthodontic separator insertion based on McGavin et al. study ²⁴. The authors wanted to observe the OTM after the VE circulated to the rats body since VE is one of the regular vitamin to be intake daily.

3. “This manuscript seems at the development stage and there are some concerns suppose to be discussed below”
     Comment : Yes Indeed, we discuss this is as our limitation of the study on the discussion chapter, moreover we added the Title of this manuscript become “A preliminary study”.

4. Model of OTM: “The reviewer felt that the model the authors used is not suitable for the model of OTM, due to excessive heavy force by elastic separation band. Other models such as the use of super-elastic coil spring between molar and incisor would be suitable”.
     Comment : Yes Indeed. For further research we should effort ourself to have more controllable and continuously force of the mechanic. We thank you again for this valuable insight and definitely we will be consider in our future works.

Minor:
1. Please add the scale in figure 2
     Comment : The Olympus CX21 light microscope we used did not have any scale bar and so that the slide we used. We were sorry for our laboratory limitation. I have tried so hard to put in to ImageJ and converted it, but still it could not be processed properly. So, still I couldn’t give the answer your inquiry.
2. VE dosage
Comment : We have edited and added to the experiment chapter

We thank you again for your kindness for the established and valuable insight of the reviews.

View more View less

Competing Interests

No competing interest were disclosed

Back to all reports

Reviewer Report

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09 Sep 2020 | for Version 1

Ananto Ali Alhasyimi, Department of Orthodontics, Faculty of Dentistry, Gadjah Mada University (UGM), Yogyakarta, Indonesia

19 Views Cite this report Responses(1)

Approved

The title and topic are quite interesting for journal scope and discover a novelty especially for developing natural materials to accelerate orthodontic tooth movement.
Paper is well-organized and easy to follow.
To improve the readability, It is recommended that the text is given an English language edit as many of the sentences might be misunderstood and some of typos were found. I suggest a revision of the English grammar structures by an expert editor in revising manuscripts.

Abstract:

The author mentioned: “Tooth movement induced by the application of orthodontic force is facilitated by bone remodeling cells and chemical mediators. Vitamin E has anti-inflammatory properties, which helps in suppressing the damaging effects of oxygen free radicals in cells during bone formation”. As we know that inflammation is a part of the orthodontic tooth movement, so it is better to find another logic to connect the reason for using Vitamin E in this study.
It stated: “Conclusion: Present outcomes demonstrate that vitamin E contributes to faster tooth movement compared to control group. It also stimulates more bone formation without reducing the bone resorption”. The author only evaluates the osteoclast and osteoblast number and did not analyze bone formation nor bone resorption indicator. It is better to write a conclusion based on what the author did.

Introduction:

At the end of the introduction part please add some of the hypotheses.

Methods:

Author used healthy male Wistar ratsà what is the rationale? Please explain shortly in the manuscript.
A dosage of 60 mg/kg Vitamin E was used in this study, what is the rationale? Please explain shortly in the manuscript.
Authors have chosen HE staining for labeling osteoclast and osteoblast number but did not use any specific marker for osteoblasts (e.g. Von-kossa or Alkaline phosphatase.) and osteoclast (TRAP), rather relied on visual analyses and counting of cells. This method of counting cells is somewhat arbitrary. There are a number of markers available for osteoblasts – osteoclasts using these biomarkers will strengthen this study.
Author should add the special characteristic of osteoclast-osteoblast (e.g. osteoblast was demonstrated as a cuboidal shape cell, characterized by a single, large, deep blue-purple nuclei, and found on the edge surfaces of alveolar bone) to minimize the bias and add the region of interest (ROI) since ROI is the key element in both number counts and distribution. Therefore, it is of utmost importance to show where were these ROIs.
A blinded evaluator was responsible for determination of the score and had undergone a training exercise involving the calculation of the Kappa coefficient for the determination of intra-examiner agreement, what about the result? Please write it whether it is satisfactory or not.

Results

General results were not reported. What happens with the general health of the animal during the administration of Vitamin E (e.g.general toxicity, edema, deaths affect the body weight of animals?)

Discussion

Fairly well written with minor typographical errors.

Conclusion

The author only evaluates the osteoclast and osteoblast number and did not analyze bone formation nor bone resorption indicator. It is better to write a conclusion based on what the author did.

Is the work clearly and accurately presented and does it cite the current literature?

Yes
Is the study design appropriate and is the work technically sound?

Yes
Are sufficient details of methods and analysis provided to allow replication by others?

Yes
If applicable, is the statistical analysis and its interpretation appropriate?

Yes
Are all the source data underlying the results available to ensure full reproducibility?

Yes
Are the conclusions drawn adequately supported by the results?

Partly

Competing Interests

No competing interests were disclosed.

Reviewer Expertise

orthodontic biomaterials

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard.

Respond to this report

Responses (1)

Author Response

15 Oct 2020

Erliera Sufarnap, Department of Orthodontics, Universitas Sumatera Utara, Medan, 20155, Indonesia

Dear Dr Ananto Ali Alhasyimi, Universitas Gadjah Mada, Sleman, Indonesia
Thank you for your kind assistance in reviewing our manuscript becoming very marvelous manuscript with your advices at many chapters. We have revised the manuscript according to some inquiries you have been suggested. Finally we add the title become ‘A preliminary study’ which suppose to be our limitation of this research and would be continue to further research which we mentioned on discussion part. Several additional references already provided to consolidated theories which were needed. The following are our comprehensive comments to the review after revised.

Abstract
1. “As we know that inflammation is a part of the orthodontic tooth movement, so it is better to find another logic to connect the reason for using Vitamin E in this study”.
  - : We have edited the reason of using VE in this study
The author only evaluates the osteoclast and osteoblast number and did not analyze bone formation nor bone resorption indicator. It is better to write a conclusion based on what the author did.
- : We have edited the conclusion based on the variables we observed without any other conclusion.

2. Introduction : “  At the end of the introduction part please add some of the hypotheses”.
   Comment : We have edited our hypothesize more pointedly.

3. Methods :
a. “Author used healthy male Wistar rats what is the rationale? Please explain    shortly in the manuscript.”
     Comment : We were sorry, we’ve missed the detail to explain why. We edited and gave a reason that VE able to modulate the estrogen (hormone) and a reference had been added to strengthen this reason.
b. “A dosage of 60 mg/kg Vitamin E was used in this study, what is the rationale? Please
explain shortly in the manuscript.
Comment : The dose chosen was based on a research that had been done by Nur Azlina et al. ¹⁷_.
c. “There are a number of markers available for osteoblasts – osteoclasts using these biomarkers will strengthen this study”.
     Comment : We mentioned changes in the title and discussion chapter as our limitations of the study
d.  Author should add the special characteristic of osteoclast-osteoblast to minimize the bias and add the region of interest (ROI) since ROI is the key element in both number counts and distribution. Therefore, it is of utmost importance to show where were these ROIs.
     Comment :  Thank you Doctor, We completed and added additional references to mention about the characteristic of osteoblasit and osteoclast and expalained about the specific ROI.
e.  A blinded evaluator was responsible for determination of the score and had undergone a training exercise involving the calculation of the Kappa coefficient for the determination of intra-examiner agreement, what about the result? Please write it whether it is satisfactory or not.
     Comment : To be honest, the level for IRR results have not very satisfactory result. The observer decided to use the “main value” from both raters as the datas to be analysed. And we also editted and added this results as our limitation of the study at the discussion chapter.

4. Results : General results were not reported. What happens with the general health of the animal during the administration of Vitamin E (e.g.general toxicity, edema, deaths affect the body weight of animals?)
     Comment : We have edited this inquiry to the result’s chapter.

5. Discussion : “Fairly well written with minor typographical errors”.
     Comment  : Thank you for the review and we already rechecked and changed.

6. Conclusion :  “The author only evaluates the osteoclast and osteoblast number and did not analyze bone formation nor bone resorption indicator. It is better to write a conclusion based on what the author did”.
     Comment : We have edited the conclusion based on the variables we observed without any
     other conclusion.

Thank you for the established reviews and the valuable insight for our manuscript.

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Competing Interests

No competing interest were disclosed

Alongside their report, reviewers assign a status to the article:

Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested

Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.

Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions

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Effect of vitamin E supplementation on orthodontic tooth movement in Wistar rats

Abstract

Keywords

Introduction

Methods

Animals

Experiment

Figure 1.

Outcomes

Statistical analysis

Results

Table 1. Comparison of tooth movement distance between Group 1 (control) and group 2 (vitamin E treatment) (n=7/subgroup (day)).

Figure 2. Osteoblasts and osteoclasts in rat alveolar bone at 400x magnification.

Table 2. Comparison of number of osteoblasts between Group 1 (control) and group 2 (vitamin E treatment) (n=7/subgroup (day)).

Table 3. Comparison of number of osteoclasts between Group 1 (control) and group 2 (vitamin E treatment) (n=7/subgroup (day)).

Discussion

Conclusions

Data availability

Underlying data

Reporting guidelines

References

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