Association of subgingival Epstein–Barr virus and periodontitis

Chaerita Maulani; Sri Lelyati C. Masulili; Widayat Djoko Santoso; Nurtami Soedarsono; Lindawati Kusdhany; Elza Ibrahim Auerkari

doi:10.12688/f1000research.52624.2

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Research Article

Revised

Association of subgingival Epstein–Barr virus and periodontitis

[version 2; peer review: 2 approved]

Chaerita Maulani¹, Sri Lelyati C. Masulili², Widayat Djoko Santoso³, Nurtami Soedarsono⁴, Lindawati Kusdhany⁵, Elza Ibrahim Auerkari ⁴

Chaerita Maulani¹, Sri Lelyati C. Masulili², [...] Widayat Djoko Santoso³, Nurtami Soedarsono⁴, Lindawati Kusdhany⁵, Elza Ibrahim Auerkari ⁴

PUBLISHED 28 Jun 2021

Author details Author details

¹ Faculty of Dentistry, Universitas Indonesia, Jakarta, 10430, Indonesia
² Department of Periodontology, Faculty of Dentistry, Universitas Indonesia, Jakarta, 10430, Indonesia
³ Department of Internal Medicine, Faculty of Medicine, Universitas Indonesia, Jakarta, 10430, Indonesia
⁴ Department of Oral Biology, Faculty of Dentistry, Universitas Indonesia, Jakarta, 10430, Indonesia
⁵ Department of Prosthodontics, Faculty of Dentistry, Universitas Indonesia, Jakarta, 10430, Indonesia

Chaerita Maulani
Roles: Data Curation, Formal Analysis, Investigation, Visualization, Writing – Original Draft Preparation

Sri Lelyati C. Masulili
Roles: Conceptualization, Project Administration, Resources, Supervision

Widayat Djoko Santoso
Roles: Methodology, Supervision, Validation

Nurtami Soedarsono
Roles: Resources, Validation, Visualization

Lindawati Kusdhany
Roles: Formal Analysis, Resources, Validation

Elza Ibrahim Auerkari
Roles: Conceptualization, Funding Acquisition, Methodology, Supervision, Writing – Review & Editing

OPEN PEER REVIEW

REVIEWER STATUS

This article is included in the Cell & Molecular Biology gateway.

This article is included in the Pathogens gateway.

Abstract

Background: The Epstein–Barr virus (EBV) is gaining interest as a possible agent in the etiology of periodontitis. Previous studies have shown controversy on whether EBV DNA in the subgingival periodontal pockets is associated with periodontitis. The present study aimed to seek the potential relationship between EBV and periodontitis.
Methods: Samples were taken from gingival crevicular fluid using sterile paper points, and data on sociodemographics, oral health, and periodontal health were recorded. This case-control study of 118 participants included 59 subjects with severe periodontitis and 59 control subjects with mild periodontitis. Quantitative real-time PCR was used to determined EBV load.
Results: EBV DNA was detected in 37.3% of the case samples and 18.6% of the control samples. There was no significant difference in a load of EBV DNA between severe and mild periodontitis (p>0.05). The observed load of EBV DNA was up to 4.55x10 ⁵ copies/mL. The detected EBV DNA was significantly associated with the plaque index and the oral hygiene index (p<0.05).
Conclusions: Although no significant association was found, EBV may play a role in periodontitis. The real-time PCR methods can be used to monitor the EBV load in gingival crevicular fluid.

Keywords

Epstein-Barr Virus, Periodontitis, Gingival Crevicular Fluid

Corresponding author: Elza Ibrahim Auerkari

Competing interests: No competing interests were disclosed.

Grant information: This research was funded by Universitas Indonesia grant number BA1072/UN2.RST/PPM.00.03.01/2020 to EIA.
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Copyright: © 2021 Maulani C 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: Maulani C, C. Masulili SL, Santoso WD et al. Association of subgingival Epstein–Barr virus and periodontitis [version 2; peer review: 2 approved]. F1000Research 2021, 10:414 (https://doi.org/10.12688/f1000research.52624.2) First published: 24 May 2021, 10:414 (https://doi.org/10.12688/f1000research.52624.1) Latest published: 28 Jun 2021, 10:414 (https://doi.org/10.12688/f1000research.52624.2)

Revised Amendments from Version 1

The revision in this article, including the corrected punctuation and grammatical errors. We hope it gives a better flow of text for the reader. In the methods section we added the number of non-respondents. The EBV detection in saliva also added in the introduction and the rational and background of the study in GCF. The references about GCF were added. The purposes of using GCF were mention in the discussion.

See the authors' detailed response to the review by Muhammad Sohail Zafar

Introduction

Periodontal diseases consist of chronic inflammatory conditions that affect the supporting tissue of the teeth. Localized inflammation within the gingiva caused by microorganisms in the dental plaque leads to gingivitis. Untreated gingivitis can progress to chronic periodontitis with the progressive loss of gingiva, bone, and periodontal ligament¹. The periodontitis process is a multifactorial interplay between microbial, host, and environmental factors. In the development of periodontitis, microbial agents are the critical key. However, microbial communities in periodontitis compared with healthy individuals showed that bleeding was not associated with a specific microbiome, although total bacterial load tends to be higher in bleeding sites². Periodontal breakdown is site-specific. It can be explained not just by bacterial specificity or immunopathology but also by a combined herpesvirus–bacterial infection³. With this contribution, herpesvirus has emerged as a significant periodontal pathogen⁴. Epstein–Barr virus (EBV) is one of eight herpesviruses that can cause disease in humans. EBV is prevalent in about 90% of the world’s population, with oral transmission being the most common route of infection⁵.

However, the presence of EBV in subgingival pockets has yielded mixed results. Some studies have reported a higher prevalence of EBV DNA with increasing severity of periodontitis^6–9, while others have shown weak or no relationship^10–12.

Oral cavity samples, such as saliva, can be used to determine the presence and quantity of viral DNA. EBV is commonly present in the saliva of periodontitis patients^13,14. Subgingival plaque, gingival crevicular fluid (GCF), and gingival tissue can all be used to detect EBV in the periodontal environment^7,15,16. The study used GCF as a sampling method because it resembles normal serum in the periodontal environment and allows multiple sampling sites within the oral cavity¹⁷. GCF sampling can be collected noninvasively using paper points and is an ideal tool to detect host-microorganism interactions and the severity of periodontal inflammations¹⁸. The previous study about EBV detection from GCF show significant results between periodontitis and control¹⁵. The presence of EBV DNA can be analyzed using PCR¹⁵, nested PCR^6,7 or quantitative real-time PCR^9,11.

This study aimed to examine using quantitative real-time PCR whether EBV DNA in subgingival pockets has a higher prevalence in systemically healthy patients with severe periodontitis than in those with mild periodontitis.

Methods

Study population

This case-control study included 118 systematically healthy, 18 to 66 years old individuals with at least 14 erupted teeth¹² and with either healthy periodontal condition, gingivitis or periodontitis. There were about 140 subjects, and 118 of them were willing to participate in the study. Subjects were excluded if they had systemic disease, periodontal treatment in the last six months, pregnancy, lactation, used antibiotic therapy or immunosuppressants in the last 3 months, had an acute illness, detectable inflammation within oral mucosa, or refused to take part in the research. All participants were given a thorough verbal and written explanation of the study and were required to sign an informed consent form. The study was approved by the Institutional Review Board, protocol number 070390418. Between June 2018 and March 2019, the research was conducted at three different district offices in Central Jakarta. The case and control subjects were recruited from the same districts. The subjects who did not meet the inclusion criteria were excluded, leaving 59 case patients with severe periodontitis and 59 controls with mild periodontitis in the final study. The sample size was considered acceptable in comparison to previous studies^9,15. The sample size also gives 80% power with the effect size 0.3 (medium) with a 0.05 two-tails significance level.

Clinical periodontal examination

For each subject, two investigators (CM, PW) performed periodontal examinations, measuring plaque index (PI)¹⁹, bleeding on probing (BOP), pocket depth (PD), clinical attachment level (CAL), and oral hygiene index–simplified (OHIS)^20,21. The plaque index was measured at four sites per tooth, according to Loe¹⁹. The UNC-15 probe (Hu-Friedy, USA) was used to measure PD at six sites per tooth (disto-buccal, mid-buccal, mesio-buccal, disto-lingual, mid-lingual and mesio-lingual). The clinical attachment loss was determine by distance between the cementoenamel junction and the base of the periodontal pocket. BOP was measured at one site per tooth using papillary bleeding index by Mühlemann²⁰. The OHIS was calculated by adding the debris index and the calculus index at two sites per tooth²¹.

Patient grouping was according to the classification of periodontal and peri-implantitis conditions²². The severe periodontitis case category included stage 3 and stage 4 periodontitis cases with CAL ≥5 mm and PD ≥6 mm. The control group included gingivitis, stage 1 and stage 2 periodontitis cases of CAL <5 mm and PD ≤5 mm^20,23.

The examiner’s reliability was verified with an interclass correlation coefficient (ICC) of 0.741 (95% CI 0.507–0.846) and 0.837 (95% CI 0.784–0.875), indicating good and excellent agreement for PD and CAL, respectively. The kappa value for PI and BOP ranged from 0.737 to 0.805, indicating substantial agreement.

Gingival crevicular fluid (GCF) was collected from four sites of the deepest periodontal pocket and randomly at one site of each quadrant in the healthy sulcus. Saliva and supragingival plaque were cleaned gently with sterile cotton pellets, separated with cotton rolls, and air-dried before sampling. A sterile paper point ISO 30 (Roeko, Germany) was inserted gently into the periodontal pocket until it reached the base of pocket depth with mild resistance and held for about 30 seconds. Bleeding sites were carefully avoided. The collected samples were pooled then put in a plastic tube containing 1 mL of sterile phosphate buffered saline. The vial was vortexed for about 1 min and then centrifuged for approximately 20 min at 3000 rpm. The supernatants were collected and samples stored at −20°C until further processing.

DNA extraction and real-time PCR

After centrifugation, DNA was extracted from GCF using a commercial kit (QIAamp DNA Mini Kit, Qiagen, Germany) according to the instructions. NanoQuant Infinite^® M200Pro was used to check for the presence and quantity of extracted DNA. The amount of EBV DNA in the samples was determined using the real-time PCR technique. The analyzed amount of EBV DNA in each sample was in a volume of 10 μL. The single-copy gene encoding the EBV nuclear antigen 1 (EBNA1) was the target sequence (EBNA1). A commercial kit (EBV/ISIN/100, GeneProof, Brno, CZ) was utilized using a real-time PCR LightCycler^® 480 II (Roche Diagnostics GmbH, Mannheim, Germany). The kit has four standards containing an EBV calibrator from 10¹ to 10⁴ copies of EBNA1 per μL. From linear regression to standard curves, quantification was conducted by extrapolation. The PCR conditions were set as directed by the manufacturer.

Statistical analysis

The findings were analyzed using IBM SPSS v.23 (RRID:SCR_019096), for which an open-access alternative would be JASP (https://jasp-stas.org; RRID:SCR_015823). The Chi-squared test was used to determine the association between EBV and periodontitis. A p-value of 0.05 or less was considered statistically significance.

Results

In total, 118 subjects with mild-to-severe periodontitis, ranging from 18 to 66 years old, mean of 38.15 ± 14.4 years, were evaluated for periodontal status, including EBV DNA in the gingival crevicular fluid. Table 1 shows the demographic and clinical periodontal parameters.

Table 1. Demographic data and clinical parameters.

Demographic data	Case (n = 59)	Control (n = 59)	p-value
Age (years)^a, median (IQR)	49 (19)	24 (14)	0.000**
Male^b, n(%)	19 (27.5)	50 (72.5)	0.000**
Female, n(%)	40 (81.6)	9 (18.4)
Non-smokers^b, n(%)	43 (58.1)	31 (41.9)	0.036*
Smokers, n(%)	16 (36.4)	28 (63.6)
Clinical parameters
PD (mm)^a, median (IQR)	1.87 (0.63)	1.44 (0.33)	0.000**
CAL (mm)^a, median (IQR)	2.60 (1.25)	1.48 (0.42)	0.000**
BOP, mean ± SD^b	1.47 ± 0.90	0.77 ± 0.62	0.000**
Plaque index^a, median (IQR)	1.24 (0.57)	0.88 (0.72)	0.001*
OHIS^a, median (IQR)	2.19 (1.25)	1.68 (1.28)	0.026*
Number of teeth^a, median (IQR)	24 (6)	27 (2)	0.000**

a Mann–Whitney test.

b Continuity correction.

c Independent t-test

EBV DNA was detected in 28.0% of all subjects, 37.3% of severe periodontitis cases, and 18.6% of mild periodontitis control cases. The highest EBV DNA level was 4.55 × 10⁵ copies/mL in severe periodontitis. No statistically significant difference in the detected EBV DNA was found between the case and control groups (Table 2).

Table 2. Prevalence of EBV DNA in GCF samples.

Variable	Case (n = 59)	Control (n = 59)	p-value
EBV^a, n (%)	22 (66.7)	11 (33.3)	0.086

a Mann–Whitney test.

In Table 3 showed the association between clinical parameters of periodontitis and EBV DNA detection. It showed that the EBV DNA load was significantly associated with the plaque index and OHIS, but not with age, gender, and other clinical parameters of periodontitis. Although not statistically significant, patients with severe periodontitis had higher EBV DNA detection than those with mild periodontitis.

Table 3. Demographic data and clinical parameters in relation to detected EBV DNA.

Variable	Detected (n = 33)	Not detected (n = 85)	p-value
Age (years)^a, median (IQR)	35 (26)	36 (28)	0.990
Male^a, n (%)	24 (34.8)	45 (65.2)	0.080
Female^a, n (%)	9 (18.4)	40 (81.6)
PD^a, median (IQR)	1.67 (0.71)	1.59 (0.53)	0.159
CAL^a, median (IQR)	2.03 (1.42)	1.86 (1.13)	0.078
BOP^a, median (IQR)	1.11 (1.01)	0.89 (1.07)	0.337
PI, mean ± SD^b	1.29 ± 0.44	1.04 ± 0.52	0.002*
OHIS^a, median (IQR)	2.39 (1.06)	1.70 (1.44)	0.001*
Number of teeth^a, median (IQR)	26 (6)	26 (5)	0.765

a Mann–Whitney test.

b Independent t-test

Discussion

Periodontal disease was initially assumed to be caused by bacteria but recent research have revealed that herpesviruses, particularly EBV, are also involved^24,25. This hypothesis emerged because some periodontal diseases cannot be explained by bacterial activity alone⁴. Our data do not support the idea that EBV plays a role in periodontitis, as some other research’ conclusions^10,12. In cases of severe periodontitis, the prevalence of EBV detected at periodontal pockets was about 37.3% which was only slightly lower than in a previous study in India with 44.2% in aggressive periodontitis⁹ lower than observed values for chronic periodontitis 72.5% in Iran⁶; 74.49% in Indonesia²⁶; and 66–68% in Japan^7,8.

Age, gender, and smoking status were associated significantly with periodontitis, so were the clinical parameters of periodontitis (Table 1). The findings support a prior study that found smoking to be a risk factor for periodontitis in periodontal classification²³.

The detected EBV DNA was not significantly associated with periodontitis, age, gender, and clinical parameters (pocket depth, clinical attachment level, bleeding on probing) of periodontitis (p > 0.05). However, the increasing plaque index and OHIS were significantly associated with detected EBV DNA (Table 3). This is in agreement with the findings of a previous study¹⁵. Low rates of EBV detection could have various reasons including study methodology. In our study, the periodontitis group had a mean of clinical attachment level of 2.74 ± 0.92, while in other studies, a mean clinical attachment level of 6.7 ± 1.6 mm did not indicate an association between prevalence of EBV and periodontitis¹². Similarly, the probing depth was 1.9 ± 0.52 mm, well below the 5.8 ± 1.2 mm in the comparison study.

We analyzed the presence of EBV DNA by sterile paper points in 118 patients from gingival crevicular fluid (GCF) as done previously using paper strips¹⁵. In other studies, EBV DNA has been detected from subgingival plaque with sterile paper point^7,8,12,26 or curettage^6,10,27. GCF is only found in small amounts in healthy sulcus, but it increases 5.5-fold during inflammation, as demonstrated in experimental gingivitis²⁸. The resting void volume in GCF is highly dependent upon the pocket depth; as a pocket increases from 3 to 6 mm, the resting void volume increases by 50%²⁹. After 6 weeks posttreatment of phase-I periodontal therapy, the GCF level in periodontitis decreased as compared to baseline¹⁵. Subgingival plaque was considered gold standard for periodontal EBV detection, that’s why GCF may be one reason for the poor detection rates. However, infrequently EBV DNA detection was also found in the subgingival plaque with curette technique in another study¹¹. In this study, we used GCF since it is non-invasive technique that can also detect the host immune response such as cytokines. A proposed mechanism for the EBV role suggests that periodontal pockets harbor EBV and contain excessive reactive oxygen species, which induce excessive development of receptor activator of nuclear factor κB ligand (RANKL) that activates osteoclasts³⁰.

The lowest positive amount of EBV DNA was 3.4 copies/mL. The range for mild periodontitis patients was up to 7.98 × 10⁴ copies/mL and for the severe periodontitis cases up to 4.55 × 10⁵ copies/mL. In a previous study in Japan on chronic periodontitis, the observed upper range of detected EBV DNA was about 10³–10⁹ copies/mL and an order of magnitude higher in deep pockets (PD ≥ 5 mm) than in shallower pockets (PD ≤3 mm)⁸.

Another reason for the variability is the grouping of periodontitis that does not present a good contrast between cases and controls when healthy subjects are uncommon so that subjects with gingivitis and mild periodontitis provide the control group. As the recent classification of periodontitis does not differentiate between aggressive and chronic periodontitis, the severity of periodontitis is based on staging²³.

Furthermore, sensitive methods like nested PCR^6,7 to identify EBV DNA have the risk of overestimating the result, while other methods like automated real-time PCR assays in previous studies found EBV DNA less frequently^10–12, including in our investigation.

A previous study about EBV in another Indonesian population of Bandung, West Java, found all subjects seropositive for EBV with 75% detection rate in subgingival EBV DNA using the same technique of qRT-PCR²⁶. Some differences in environmental, ethnic, and immunogenetic factors may contribute but are not expected to be significant. Limitations of the study include the relatively small sample size so the study may have a limited power²⁶.

Conclusions

Our findings showed no significant association between EBV and periodontitis, although in cases of severe periodontitis, EBV DNA was detected more frequently and at a higher maximum level than in cases of mild periodontitis. Gingival crevicular fluid is useful to check the EBV load using a real-time PCR technique.

Data availability

Underlying data

Harvard Dataverse: Underlying data for ‘Association of subgingival Epstein–Barr virus and periodontitis’. https://doi.org/10.7910/DVN/AR3Y00

This project contains the following underlying data: F1000_EBV_RawData_EIA_2021.csv

Data are available under the terms of the Creative Commons Zero “No rights reserved” data waiver (CC0 1.0 Public domain dedication).

Consent

Written informed consent for publication of the patient details was obtained from the patients.

Author contributions

CM: Data Curation, Formal Analysis, Investigation, Visualization, Writing-Original Draft Preparation; SLM: Conceptualization, Project Administration, Supervision; WDS: Methodology, Supervision, Validation; NS: Validation, Visualization; LK: Formal Analysis, Validation; EIA: Conceptualization, Funding Acquisition, Methodology, Supervision, Writing-Review & Editing.

Acknowledgments

The authors wish to gratefully acknowledge the expert technical assistance of Pitu Wulandari in clinical examination, and Universitas Indonesia for funding the work.

Faculty Opinions recommended

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Version 2

VERSION 2 PUBLISHED 24 May 2021

Author details Author details

Chaerita Maulani
Roles: Data Curation, Formal Analysis, Investigation, Visualization, Writing – Original Draft Preparation

Sri Lelyati C. Masulili
Roles: Conceptualization, Project Administration, Resources, Supervision

Widayat Djoko Santoso
Roles: Methodology, Supervision, Validation

Nurtami Soedarsono
Roles: Resources, Validation, Visualization

Lindawati Kusdhany
Roles: Formal Analysis, Resources, Validation

Elza Ibrahim Auerkari
Roles: Conceptualization, Funding Acquisition, Methodology, Supervision, Writing – Review & Editing

Competing interests

No competing interests were disclosed.

Grant information

This research was funded by Universitas Indonesia grant number BA1072/UN2.RST/PPM.00.03.01/2020 to EIA.
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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https://doi.org/10.12688/f1000research.52624.2

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© 2021 Maulani C 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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Maulani C, C. Masulili SL, Santoso WD et al. Association of subgingival Epstein–Barr virus and periodontitis [version 2; peer review: 2 approved]. F1000Research 2021, 10:414 (https://doi.org/10.12688/f1000research.52624.2)

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Reviewer Report 13 Jul 2021

Muhammad Sohail Zafar, Department of Restorative Dentistry, College of Dentistry, Taibah University, Medina, Saudi Arabia

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https://doi.org/10.5256/f1000research.58041.r88310

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Reviewer Report 12 Jul 2021

Shahida Mohd-Said, Centre for Restorative Dentistry, Faculty of Dentistry, National University of Malaysia (UKM), Kuala Lumpur, Malaysia

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https://doi.org/10.5256/f1000research.58041.r87685

A relevant and interesting study on the association of EBV and Periodontitis. Good and clear Introduction and justified reason for study.

Well written and detailed Methods, with good number of patients and samples. Clearly explained Results; Distribution of microorganism is more suitable to be used than Prevalence, as the samples do not represent the bigger population. Good discussion with relevant literature to support.

Nonetheless I think the implication of the study findings within the interested population would benefit the paper better, with emphasise on its impact to the current or future management of periodontitis and the wellness of the particular population in general. Sound conclusion.

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?

I cannot comment. A qualified statistician is required.
Are all the source data underlying the results available to ensure full reproducibility?

Partly
Are the conclusions drawn adequately supported by the results?

Yes

Competing Interests: No competing interests were disclosed.

Reviewer Expertise: Periodontology - Microbiology and Immunology Research, Natural Product Drug Discovery Research, Oral Health Service and Management Systems Research

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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Version 1

VERSION 1

PUBLISHED 24 May 2021

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Reviewer Report 16 Jun 2021

Muhammad Sohail Zafar, Department of Restorative Dentistry, College of Dentistry, Taibah University, Medina, Saudi Arabia

Approved with Reservations

https://doi.org/10.5256/f1000research.55925.r86020

I have reviewed the manuscript “Association of subgingival Epstein–Barr virus and periodontitis” submitted to F1000Research for publication. In this study, authors have investigated the potential relationship between Epstein–Barr virus and periodontitis. This is a well conducted study and the manuscript fits well within the scope of the journal; it needs some improvements; there are a few suggestions that authors may consider to improve it further:

The use of English language is reasonable, however, there are a number of punctuation and grammatical errors; that should be corrected and rephrased using academic English for a better flow of text for reader.

Authors should clarify that whether the STROBE checklist was used or not.

Authors should mention more information regarding the non-respondents (i.e., how many individuals were willing to participant and how many were not?).

Authors have used GCF in this study to measure EBV level. Is there any study that showed the use of saliva to measure the EBV?

The introduction section is very brief and barely cover the rationale of the study and background of GCF in context. Authors should expand the introduction section a bit more adding GCF details. The following articles on GCF may be included (which I am a co-author):

Human gingival crevicular fluids (GCF) proteomics: an overview." Dentistry Journal 5.1 (2017): 12¹.
Bacteriological Evaluation of Gingival Crevicular Fluid in Teeth Restored Using Fixed Dental Prostheses: An In Vivo Study." International Journal of Molecular Sciences 22.11 (2021): 5463².

Please add; What was the main purpose of using GCF in this study?

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?

Yes

References

1. Khurshid Z, Mali M, Naseem M, Najeeb S, et al.: Human Gingival Crevicular Fluids (GCF) Proteomics: An Overview.Dent J (Basel). 2017; 5 (1). PubMed Abstract | Publisher Full Text
2. Heboyan A, Manrikyan M, Zafar MS, Rokaya D, et al.: Bacteriological Evaluation of Gingival Crevicular Fluid in Teeth Restored Using Fixed Dental Prostheses: An In Vivo Study.Int J Mol Sci. 2021; 22 (11). PubMed Abstract | Publisher Full Text

Competing Interests: No competing interests were disclosed.

Reviewer Expertise: Dentistry

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, however I have significant reservations, as outlined above.

CITE

Report a concern

Author Response 28 Jun 2021

Elza Ibrahim Auerkari, Department of Oral Biology, Faculty of Dentistry, Universitas Indonesia, Jakarta, 10430, Indonesia

28 Jun 2021

Author Response
"I have reviewed the manuscript “Association of subgingival Epstein–Barr virus and periodontitis” submitted to F1000Research for publication. In this study, authors have investigated the potential relationship between Epstein–Barr virus and ... Continue reading
"I have reviewed the manuscript “Association of subgingival Epstein–Barr virus and periodontitis” submitted to F1000Research for publication. In this study, authors have investigated the potential relationship between Epstein–Barr virus and periodontitis. This is a well conducted study and the manuscript fits well within the scope of the journal; it needs some improvements; there are a few suggestions that authors may consider to improve it further:

The use of English language is reasonable, however, there are a number of punctuation and grammatical errors; that should be corrected and rephrased using academic English for a better flow of text for reader."

Answer: We check again the punctuation and grammatical errors.

"Authors should clarify that whether the STROBE checklist was used or not."

Answer: STROBE checklist was not used in our study but our manuscript was checked against the STROBE checklist by the academic editor journal, and we completed the manuscript according to that checklist.

"Authors should mention more information regarding the non-respondents (i.e., how many individuals were willing to participant and how many were not?)."

Answer: We added in the non-respondents in the methods.

"Authors have used GCF in this study to measure EBV level. Is there any study that showed the use of saliva to measure the EBV?"

Answer: Yes, some study did measure EBV level in GCF or saliva or subgingival plaque. We added in the introduction.

"The introduction section is very brief and barely cover the rationale of the study and background of GCF in context. Authors should expand the introduction section a bit more adding GCF details. The following articles on GCF may be included (which I am a co-author):

Human gingival crevicular fluids (GCF) proteomics: an overview." Dentistry Journal 5.1 (2017): 12¹.

Bacteriological Evaluation of Gingival Crevicular Fluid in Teeth Restored Using Fixed Dental Prostheses: An In Vivo Study." International Journal of Molecular Sciences 22.11 (2021): 5463²."

Answer: Thank you for the suggestion, we added the references in the introduction section.

"Please add; What was the main purpose of using GCF in this study?"

Answer: We added in the purpose of using GCF in the discussion.
"I have reviewed the manuscript “Association of subgingival Epstein–Barr virus and periodontitis” submitted to F1000Research for publication. In this study, authors have investigated the potential relationship between Epstein–Barr virus and periodontitis. This is a well conducted study and the manuscript fits well within the scope of the journal; it needs some improvements; there are a few suggestions that authors may consider to improve it further:

The use of English language is reasonable, however, there are a number of punctuation and grammatical errors; that should be corrected and rephrased using academic English for a better flow of text for reader."

Answer: We check again the punctuation and grammatical errors.

"Authors should clarify that whether the STROBE checklist was used or not."

Answer: STROBE checklist was not used in our study but our manuscript was checked against the STROBE checklist by the academic editor journal, and we completed the manuscript according to that checklist.

"Authors should mention more information regarding the non-respondents (i.e., how many individuals were willing to participant and how many were not?)."

Answer: We added in the non-respondents in the methods.

"Authors have used GCF in this study to measure EBV level. Is there any study that showed the use of saliva to measure the EBV?"

Answer: Yes, some study did measure EBV level in GCF or saliva or subgingival plaque. We added in the introduction.

"The introduction section is very brief and barely cover the rationale of the study and background of GCF in context. Authors should expand the introduction section a bit more adding GCF details. The following articles on GCF may be included (which I am a co-author):

Human gingival crevicular fluids (GCF) proteomics: an overview." Dentistry Journal 5.1 (2017): 12¹.

Bacteriological Evaluation of Gingival Crevicular Fluid in Teeth Restored Using Fixed Dental Prostheses: An In Vivo Study." International Journal of Molecular Sciences 22.11 (2021): 5463²."

Answer: Thank you for the suggestion, we added the references in the introduction section.

"Please add; What was the main purpose of using GCF in this study?"

Answer: We added in the purpose of using GCF in the discussion.
Competing Interests: The authors declare that there is no competing interests Close
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COMMENTS ON THIS REPORT

Author Response 28 Jun 2021

Elza Ibrahim Auerkari, Department of Oral Biology, Faculty of Dentistry, Universitas Indonesia, Jakarta, 10430, Indonesia

28 Jun 2021

Author Response
"I have reviewed the manuscript “Association of subgingival Epstein–Barr virus and periodontitis” submitted to F1000Research for publication. In this study, authors have investigated the potential relationship between Epstein–Barr virus and ... Continue reading
"I have reviewed the manuscript “Association of subgingival Epstein–Barr virus and periodontitis” submitted to F1000Research for publication. In this study, authors have investigated the potential relationship between Epstein–Barr virus and periodontitis. This is a well conducted study and the manuscript fits well within the scope of the journal; it needs some improvements; there are a few suggestions that authors may consider to improve it further:

The use of English language is reasonable, however, there are a number of punctuation and grammatical errors; that should be corrected and rephrased using academic English for a better flow of text for reader."

Answer: We check again the punctuation and grammatical errors.

"Authors should clarify that whether the STROBE checklist was used or not."

Answer: STROBE checklist was not used in our study but our manuscript was checked against the STROBE checklist by the academic editor journal, and we completed the manuscript according to that checklist.

"Authors should mention more information regarding the non-respondents (i.e., how many individuals were willing to participant and how many were not?)."

Answer: We added in the non-respondents in the methods.

"Authors have used GCF in this study to measure EBV level. Is there any study that showed the use of saliva to measure the EBV?"

Answer: Yes, some study did measure EBV level in GCF or saliva or subgingival plaque. We added in the introduction.

"The introduction section is very brief and barely cover the rationale of the study and background of GCF in context. Authors should expand the introduction section a bit more adding GCF details. The following articles on GCF may be included (which I am a co-author):

Human gingival crevicular fluids (GCF) proteomics: an overview." Dentistry Journal 5.1 (2017): 12¹.

Bacteriological Evaluation of Gingival Crevicular Fluid in Teeth Restored Using Fixed Dental Prostheses: An In Vivo Study." International Journal of Molecular Sciences 22.11 (2021): 5463²."

Answer: Thank you for the suggestion, we added the references in the introduction section.

"Please add; What was the main purpose of using GCF in this study?"

Answer: We added in the purpose of using GCF in the discussion.
"I have reviewed the manuscript “Association of subgingival Epstein–Barr virus and periodontitis” submitted to F1000Research for publication. In this study, authors have investigated the potential relationship between Epstein–Barr virus and periodontitis. This is a well conducted study and the manuscript fits well within the scope of the journal; it needs some improvements; there are a few suggestions that authors may consider to improve it further:

The use of English language is reasonable, however, there are a number of punctuation and grammatical errors; that should be corrected and rephrased using academic English for a better flow of text for reader."

Answer: We check again the punctuation and grammatical errors.

"Authors should clarify that whether the STROBE checklist was used or not."

Answer: STROBE checklist was not used in our study but our manuscript was checked against the STROBE checklist by the academic editor journal, and we completed the manuscript according to that checklist.

"Authors should mention more information regarding the non-respondents (i.e., how many individuals were willing to participant and how many were not?)."

Answer: We added in the non-respondents in the methods.

"Authors have used GCF in this study to measure EBV level. Is there any study that showed the use of saliva to measure the EBV?"

Answer: Yes, some study did measure EBV level in GCF or saliva or subgingival plaque. We added in the introduction.

"The introduction section is very brief and barely cover the rationale of the study and background of GCF in context. Authors should expand the introduction section a bit more adding GCF details. The following articles on GCF may be included (which I am a co-author):

Human gingival crevicular fluids (GCF) proteomics: an overview." Dentistry Journal 5.1 (2017): 12¹.

Bacteriological Evaluation of Gingival Crevicular Fluid in Teeth Restored Using Fixed Dental Prostheses: An In Vivo Study." International Journal of Molecular Sciences 22.11 (2021): 5463²."

Answer: Thank you for the suggestion, we added the references in the introduction section.

"Please add; What was the main purpose of using GCF in this study?"

Answer: We added in the purpose of using GCF in the discussion.
Competing Interests: The authors declare that there is no competing interests Close
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Muhammad Sohail Zafar, Taibah University, Medina, Saudi Arabia
Shahida Mohd-Said, National University of Malaysia (UKM), Kuala Lumpur, Malaysia

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8 Views

13 Jul 2021 | for Version 2

Muhammad Sohail Zafar, Department of Restorative Dentistry, College of Dentistry, Taibah University, Medina, Saudi Arabia

8 Views Cite this report Responses(0)

Approved

Many thanks for the revision and responding to the comments.

Competing Interests

No competing interests were disclosed.

Reviewer Expertise

Dentistry

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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12 Views

12 Jul 2021 | for Version 2

Shahida Mohd-Said, Centre for Restorative Dentistry, Faculty of Dentistry, National University of Malaysia (UKM), Kuala Lumpur, Malaysia

12 Views Cite this report Responses(0)

Approved

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?

I cannot comment. A qualified statistician is required.
Are all the source data underlying the results available to ensure full reproducibility?

Partly
Are the conclusions drawn adequately supported by the results?

Yes

Competing Interests

No competing interests were disclosed.

Reviewer Expertise

Periodontology - Microbiology and Immunology Research, Natural Product Drug Discovery Research, Oral Health Service and Management Systems Research

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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Reviewer Report

17 Views

16 Jun 2021 | for Version 1

Muhammad Sohail Zafar, Department of Restorative Dentistry, College of Dentistry, Taibah University, Medina, Saudi Arabia

17 Views Cite this report Responses(1)

Approved With Reservations

Human gingival crevicular fluids (GCF) proteomics: an overview." Dentistry Journal 5.1 (2017): 12¹.
Bacteriological Evaluation of Gingival Crevicular Fluid in Teeth Restored Using Fixed Dental Prostheses: An In Vivo Study." International Journal of Molecular Sciences 22.11 (2021): 5463².

Please add; What was the main purpose of using GCF in this study?

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?

Yes

References

Competing Interests

No competing interests were disclosed.

Reviewer Expertise

Dentistry

Respond to this report

Responses (1)

Author Response

28 Jun 2021

Elza Ibrahim Auerkari, Department of Oral Biology, Faculty of Dentistry, Universitas Indonesia, Jakarta, 10430, Indonesia

"I have reviewed the manuscript “Association of subgingival Epstein–Barr virus and periodontitis” submitted to F1000Research for publication. In this study, authors have investigated the potential relationship between Epstein–Barr virus and periodontitis. This is a well conducted study and the manuscript fits well within the scope of the journal; it needs some improvements; there are a few suggestions that authors may consider to improve it further:

The use of English language is reasonable, however, there are a number of punctuation and grammatical errors; that should be corrected and rephrased using academic English for a better flow of text for reader."

Answer: We check again the punctuation and grammatical errors.

"Authors should clarify that whether the STROBE checklist was used or not."

Answer: STROBE checklist was not used in our study but our manuscript was checked against the STROBE checklist by the academic editor journal, and we completed the manuscript according to that checklist.

"Authors should mention more information regarding the non-respondents (i.e., how many individuals were willing to participant and how many were not?)."

Answer: We added in the non-respondents in the methods.

"Authors have used GCF in this study to measure EBV level. Is there any study that showed the use of saliva to measure the EBV?"

Answer: Yes, some study did measure EBV level in GCF or saliva or subgingival plaque. We added in the introduction.

"The introduction section is very brief and barely cover the rationale of the study and background of GCF in context. Authors should expand the introduction section a bit more adding GCF details. The following articles on GCF may be included (which I am a co-author):

Human gingival crevicular fluids (GCF) proteomics: an overview." Dentistry Journal 5.1 (2017): 12¹.
Bacteriological Evaluation of Gingival Crevicular Fluid in Teeth Restored Using Fixed Dental Prostheses: An In Vivo Study." International Journal of Molecular Sciences 22.11 (2021): 5463²."

Answer: Thank you for the suggestion, we added the references in the introduction section.

"Please add; What was the main purpose of using GCF in this study?"

Answer: We added in the purpose of using GCF in the discussion.

View more View less

Competing Interests

The authors declare that there is no competing interests

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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Association of subgingival Epstein–Barr virus and periodontitis

Abstract

Keywords

Revised Amendments from Version 1

Introduction

Methods

Study population

Clinical periodontal examination

DNA extraction and real-time PCR

Statistical analysis

Results

Table 1. Demographic data and clinical parameters.

Table 2. Prevalence of EBV DNA in GCF samples.

Table 3. Demographic data and clinical parameters in relation to detected EBV DNA.

Discussion

Conclusions

Data availability

Underlying data

Consent

Author contributions

Acknowledgments

References

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