Home Browse Comparative evaluation of retention of record bases fabricated using...
ALL Metrics
-
Views
-
Downloads
Get PDF
Get XML
Cite
Export
Track
▬
✚
Study Protocol

Comparative evaluation of retention of record bases fabricated using conventional impression and modified digital scan for complete denture: An in vivo study

[version 1; peer review: 3 approved with reservations]
Mahima Agrawal
https://orcid.org/0009-0009-1072-2596
1, Anjali Borle1
Mahima Agrawal
https://orcid.org/0009-0009-1072-2596
1, Anjali Borle1
PUBLISHED 02 Aug 2023
Author details Author details
OPEN PEER REVIEW
REVIEWER STATUS

This article is included in the Datta Meghe Institute of Higher Education and Research collection.

Abstract

Background: In prosthetic dentistry, making an impression to replicate the oral health and tooth morphology is regarded as a crucial step. It is essential to ensure that the intraoral state is replicated as exactly as possible throughout this process, because any mistakes or inconsistencies could significantly impact the quality of the entire denture. In secondary impression, it’s crucial to capture the resilient oral mucosa (oral vestibule and soft palate) in order to acquire a satisfactory retention. As an alternative to conventional impression, digital scanning has been widely used in complete denture procedure. Although the digital scanning of edentulous ridges is feasible, scanning resilient oral tissues in complete denture still cannot be supported digitally. This study focuses on modifying the digital scan and comparison of retention of record bases fabricated from these modified digital scan to the record bases fabricated using conventional impression.
Objectives: To compare the retention of record base prepared from conventional impression to the retention of record base from modified digital scan.
Methodology: A total of 18 patients with edentulous maxillary arches will be recruited. A modified intraoral scan of the maxilla will be made on nine patients and on the remaining nine patients, a conventionally border moulded impression with a custom tray will be made. A record base with heat polymerized acrylic resin will be made on the definitive cast. Using the modified scanned image, the CAD-CAM bases will be milled. A dynamometer will be placed onto the record base; this will simulate the dislodging forces, thus clinically testing record base retention.
Expected outcome: The record bases from modified digital scan will show equivalent or higher retention compared to record bases from conventional impression.
Conclusions: By the end of the study, we will know whether resiliency of tissues can be recorded by modified digital scans.

Keywords

Tissue resiliency, digital scanning, conventional impression, retention

Corresponding author: Mahima Agrawal
Competing interests: No competing interests were disclosed.
Grant information: The author(s) declared that no grants were involved in supporting this work.
Copyright:  © 2023 Agrawal M and Borle A. 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: Agrawal M and Borle A. Comparative evaluation of retention of record bases fabricated using conventional impression and modified digital scan for complete denture: An in vivo study [version 1; peer review: 3 approved with reservations]. F1000Research 2023, 12:927 (https://doi.org/10.12688/f1000research.135068.1) First published: 02 Aug 2023, 12:927 (https://doi.org/10.12688/f1000research.135068.1) Latest published: 02 Aug 2023, 12:927 (https://doi.org/10.12688/f1000research.135068.1)

Introduction

Background and rationale

In prosthetic dentistry, making an impression to replicate the oral health and tooth morphology is regarded as a crucial step. One of the most essential and integral parts of dentistry is making an accurate dental impression. It is essential to ensure that the intraoral state is replicated as exactly as possible throughout this process because any mistakes or inconsistencies could have a significant impact on the quality of the entire denture.1

The generated casts are used for diagnostic purposes, treatment planning and prosthesis. In order for the impression to serve its purpose, it has to accurately represent oral tissues of the patient.2

In secondary impression, it’s crucial to capture the resilient oral mucosa (oral vestibule and soft palate) in order to acquire a satisfactory retention. Soft-tissue management, inappropriate impression tray selection, separation of the impression material from the impression tray, distortion of conventional impressions prior to pouring, and storage of conventional impressions for prospective cast remaking are issues with conventional impressions. Furthermore, patients have reported that conventional impressions make for an uncomfortable treatment experience, particularly for young patients and those with a strong gag reflex. These problems associated with conventional impression can be solved by impressions with digital scanners. Digital systems have certain drawbacks compared to conventional impression systems, such as the difficulty to accurately imprint mobile tissues and the tendency of the scan to modify the impression by diminishing trueness when imprinting the jaws.3

In the last years, digital scanning has been widely applied in complete denture fabrication as an alternative to conventional impression taking. The direct scanning of edentulous jaws has recently been developed, although they do not account for functional mucosal reflections. However, in several of these approaches dependability and reproducibility are under doubt. The two greatest drawbacks are the inability to take functional digital impressions and the lack of precision.4

However, fully edentulous jaws are challenging to scan with an intraoral scanner due to the presence of nonkeratinized moveable mucosa and smooth surfaces covered with saliva. Moreover, only a monostatic image of the edentulous arches can be obtained by intraoral scanning; the resilient oral mucosa is not included.5

The conventional impression for complete denture fabrication involves loading the custom tray with either an elastomer or zinc-oxide eugenol impression paste after moulding the periphery’s plastic border. The molding of a peripheral border in function is still not possible with a digital scan. Thus, digital scanning can be modified to correctly register resilient oral tissues and the soft tissue areas in the posterior maxilla which aids in retention of maxillary complete denture.6

Objectives

  • • To evaluate the retention of record base prepared by conventional impression method.

  • • To evaluate the retention of record base prepared from modified digital scan.

  • • To compare the retention of record base prepared from conventional impression to the retention of record base from modified digital scan.

  • • To evaluate the effectiveness, clinical outcomes of modified digital impression compared to conventional impression.

Trial design

It will be an in vivo experimental cross-over study.

Methods

Study settings

This in vivo study will be conducted in the Department of Prosthodontics and Crown & Bridge, Sharad Pawar Dental College and Hospital, Sawangi, Wardha.

Eligibility criteria

Inclusion criteria

  • • Patients willing to participate in the study.

  • • Patients having signed informed consent form.

  • • Patients with well-formed edentulous maxillary arch.

Exclusion criteria

  • • Patients with excessive maxillary ridge resorption.

  • • Patients with bony undercut of more than 2 mm in the maxillary ridge will be excluded.

  • • Patients with poor neuromuscular control.

  • • Patients with malignancies.

  • • Patients with flabby ridge, papillary hyperplasia.

  • • Patients with epulis fissuratum.

Intervention

The participants will be divided into two groups, each group containing nine participants.

Group I - Conventional impression

Group II - Modified digital scan

A thorough intraoral examination will be carried out. In group I patients, conventionally border molded impression with a custom tray will be made and a definitive cast will be obtained. A record base with heat polymerizing acrylic resin will be made on the definitive cast. In group II patients, the maxilla will be scanned using an intraoral scanner. The scanned image will be modified by incorporating coding calculations according to the resiliency of the tissues. Using the modified scanned image, the CAD-CAM bases will be milled. A platform will be designed with a 45-degree inclination. A dislodging force will be applied via a dynamometer connected to a hook. This will simulate the dislodging force thus, clinically testing record base retention. The retention offered by the conventional record base and CAD-CAM milled record bases from the modified intraoral scan will be compared.

Outcomes

Primary outcome

Modified digital impression will result in more time efficient technique than conventional impression. By the end of the study, we will know whether resiliency of tissues can be recorded by modified digital scans.

Secondary outcome

This study integrates the modified digital scans in the workflow of complete denture fabrication.

Sample size

Formula using mean difference

n1=n2=2Zα+Zβ2σ2δ2
Zα=1.96
α=Type I error at 5%
Zβ=1.281−β=Power at 90%
σ=std. dev.

Primary variable (retention of the base)

Mean±SD.conventional record base=14.52±17.07
Mean±SD.milled record base=6.58±4.92
Difference=14.52−6.58=7.94
Std. dev.=0.02

As per reference articles.

N1=2∗1.96+1.2824.922/7.942=9

Total samples required = 9 per group.

Total number of groups = 2 groups.

Statistical method

An unpaired t-test will be used for statistical analysis.

Dissemination

The modified scan technique may overcome the clinical difficulties during recording of functional depth of sulci and access to the posterior areas taking into consideration the resiliency of tissues during digital scanning procedure. Thus, the modified scan technique may help the clinician to overcome a major drawback of intra oral scanner for complete denture impressions achieving retention of the denture bases equivalent to conventional procedures.

Study status

The study has not started yet at time of writing.

Discussion

It is currently unknown whether intraoral scans for complete dentures are of sufficient quality as compared to traditional border-molded impression procedures.6 This study will focus on the comparison of the record bases fabricated by conventional impression and modified intraoral scan and whether they show any relevant clinical differences.6 According to the present study, a mucostatic digital scan does not record the resiliency of tissues.6 The clinician places the finishing line of the intraoral scan at the boundary between the attached gingiva and the movable resilient tissues on the outer edge of the edentulous arch.6 This may result in a underextended or overextended boundary.6 Thus, there is a need to post-process the scan of edentulous arches when making the record.7 Compared to conventional impression technique digital impression technique is more patient friendly.7 Modifications of the digital scan may overcome the shortcomings of the intraoral scan and improve the retention.8–10

Ethical considerations

Ethical approval received from Datta Meghe Institute of Higher Education and Research, Sawangi, Wardha. ICE reference number: DMIHER(DU)/ICE/2023/850.

Consent

The procedure will be explained to all the patients willing to participate in the research. A written informed consent will be taken from the patients.

Data availability

Underlying data

No data are associated with this article.

Acknowledgements

I thank my Institution and my guide for helping me in conducting this study.

References

  • 1.  Sason GK, Mistry G, Tabassum R, et al.: A comparative evaluation of intraoral and extraoral digital impressions: An in vivo study. J. Indian Prosthodont. Soc. 2018 Apr; 18(2): 108–116. PubMed Abstract | Publisher Full Text | Free Full Text
  • 2.  Abduo J, Elseyoufi M: Accuracy of Intraoral Scanners: A Systematic Review of Influencing Factors. Eur. J. Prosthodont. Restor. Dent. 2018 Aug 30; 26(3): 101–121. PubMed Abstract | Publisher Full Text
  • 3.  Aswani K, Wankhade S, Khalikar A, et al.: Accuracy of an intraoral digital impression: A review. J. Indian Prosthodont. Soc. 2020 Jan; 20(1): 27–37. PubMed Abstract | Publisher Full Text | Free Full Text
  • 4.  Malik J, Rodriguez J, Weisbloom M, et al.: Comparison of accuracy between a conventional and two digital intraoral impression techniques. Int. J. Prosthodont. 2018 Mar 1; 31(3): 107–113. Publisher Full Text
  • 5.  Mai HN, Lee DH: A digital technique to replicate edentulous arches with functional borders and accurate maxillomandibular relationship for digital complete denture. J. Prosthodont. 2020 Apr; 29(4): 356–359. PubMed Abstract | Publisher Full Text
  • 6.  Chebib N, Imamura Y, El Osta N, et al.: Fit and retention of complete denture bases: Part II–conventional impressions versus digital scans: A clinical controlled crossover study. J. Prosthet. Dent. 2022 Aug 30; PubMed Abstract | Publisher Full Text
  • 7.  Yuzbasioglu E, Kurt H, Turunc R, et al.: Comparison of digital and conventional impression techniques: evaluation of patients’ perception, treatment comfort, effectiveness and clinical outcomes. BMC Oral Health. 2014 Dec; 14(1): 1–7. Publisher Full Text
  • 8.  Chebib N, Kalberer N, Srinivasan M, et al.: Edentulous jaw impression techniques: An in vivo comparison of trueness. J. Prosthet. Dent. 2019 Apr 1; 121(4): 623–630. PubMed Abstract | Publisher Full Text
  • 9.  D’Arienzo LF, Casucci A, Ferrari M, et al.: Accuracy, time efficiency and operator preference in edentulous arch scanning: a preliminary report: a preliminary report. J. Osseointegration. 2021 Sep 29; 13(3): 164–170.
  • 10.  Agrawal S, Kambala S, Borle A, et al.: Comparative evaluation of effect of microcurrent electrical stimulation on acupoints to control gag reflex in patients receiving prosthodontic treatment: An in vivo study. J. Indian Prosthodont. Soc. 2022; 22: 188–194. PubMed Abstract | Publisher Full Text | Free Full Text

Comments on this article Comments (0)

Version 1
VERSION 1 PUBLISHED 02 Aug 2023
Comment
Author details Author details
Competing interests
Grant information
Article Versions (1)
Copyright
Download
 
Export To
metrics
Views Downloads
F1000Research - -
PubMed Central
Data from PMC are received and updated monthly.
 - -
Citations
SEE MORE DETAILS
CITE
how to cite this article
Agrawal M and Borle A. Comparative evaluation of retention of record bases fabricated using conventional impression and modified digital scan for complete denture: An in vivo study [version 1; peer review: 3 approved with reservations]. F1000Research 2023, 12:927 (https://doi.org/10.12688/f1000research.135068.1)
NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article.
track
receive updates on this article
Track an article to receive email alerts on any updates to this article.

Open Peer Review

Current Reviewer Status: ?
Key to Reviewer Statuses VIEW
ApprovedThe 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 approvedFundamental flaws in the paper seriously undermine the findings and conclusions
Version 1
VERSION 1
PUBLISHED 02 Aug 2023
Views
6
Cite
Reviewer Report 23 Oct 2023
Tahir ullah Khan, Lady Reading Hospital Medical Teaching Institute, Peshawar, Pakistan 
Approved with Reservations
VIEWS 6
https://doi.org/10.5256/f1000research.148169.r206850
INTRODUCTION

Its well structured and written in scientific way. Gaps in the literature are identified and will be addressed by this project. 

MATERIAL AND METHODS

Over all its well written but ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Khan Tu. Reviewer Report For: Comparative evaluation of retention of record bases fabricated using conventional impression and modified digital scan for complete denture: An in vivo study [version 1; peer review: 3 approved with reservations]. F1000Research 2023, 12:927 (https://doi.org/10.5256/f1000research.148169.r206850)
The direct URL for this report is:
https://f1000research.com/articles/12-927/v1#referee-response-206850
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
Report a concern
Views
5
Cite
Reviewer Report 23 Oct 2023
Mohamed Ahmed Alkhodary, Alexandria University, egypt, Egypt 
Approved with Reservations
VIEWS 5
https://doi.org/10.5256/f1000research.148169.r216446
The rationale for, and objectives of, the study are clearly described, and the study design is appropriate for the research question, however, sufficient details of the methods provided do not allow replication by others as the nature of the modified ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Alkhodary MA. Reviewer Report For: Comparative evaluation of retention of record bases fabricated using conventional impression and modified digital scan for complete denture: An in vivo study [version 1; peer review: 3 approved with reservations]. F1000Research 2023, 12:927 (https://doi.org/10.5256/f1000research.148169.r216446)
The direct URL for this report is:
https://f1000research.com/articles/12-927/v1#referee-response-216446
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
Report a concern
Views
3
Cite
Reviewer Report 04 Sep 2023
Gopi Chander, SRM Dental College, Chennai, Tamil nadu, India 
Approved with Reservations
VIEWS 3
https://doi.org/10.5256/f1000research.148169.r198641
  1. Clarity and Organization: The content is generally well-organized, with distinct sections for the introduction, background, objectives, trial design, methods, outcomes, and other relevant information. This structure helps readers understand the purpose and context of the study.
... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Chander G. Reviewer Report For: Comparative evaluation of retention of record bases fabricated using conventional impression and modified digital scan for complete denture: An in vivo study [version 1; peer review: 3 approved with reservations]. F1000Research 2023, 12:927 (https://doi.org/10.5256/f1000research.148169.r198641)
The direct URL for this report is:
https://f1000research.com/articles/12-927/v1#referee-response-198641
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
Report a concern

Comments on this article Comments (0)

Version 1
VERSION 1 PUBLISHED 02 Aug 2023
Comment

Open Peer Review

Reviewer Status

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

Reviewer Reports

Invited Reviewers
1 2 3
Version 1
02 Aug 23 		read read read
  1. Gopi Chander, SRM Dental College, Chennai, India
  2. Mohamed Ahmed Alkhodary, Alexandria University, egypt, Egypt
  3. Tahir ullah Khan, Lady Reading Hospital Medical Teaching Institute, Peshawar, Pakistan

Comments on this article

All Comments(0)

Add a comment
Sign up for content alerts

Browse by related subjects

    keyboard_arrow_left Back to all reports
    keyboard_arrow_left Back to all reports
    keyboard_arrow_left Back to all reports
    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
    Sign In
    If you've forgotten your password, please enter your email address below and we'll send you instructions on how to reset your password.

    The email address should be the one you originally registered with F1000.
    Email address not valid, please try again

    You registered with F1000 via Google, so we cannot reset your password.

    To sign in, please click here.

    If you still need help with your Google account password, please click here.

    You registered with F1000 via Facebook, so we cannot reset your password.

    To sign in, please click here.

    If you still need help with your Facebook account password, please click here.

    Code not correct, please try again
    Email us for further assistance.
    Server error, please try again.