Retrospective Analysis of Tooth Preparation Done by Postgraduate Trainees for Monolithic Zirconia Restorations
Introduction: Computer-Aided Designing/Computer-Aided Manufacturing (CAD/CAM) technology has revolutionised the practice of restorative dentistry. Zirconia has become a popular choice of restorative material due to the various advantages of metal-free dentistry. Postgraduate prosthodontics trainees...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
JCDR Research and Publications Private Limited
2025-08-01
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| Series: | Journal of Clinical and Diagnostic Research |
| Subjects: | |
| Online Access: | https://jcdr.net/article_fulltext.asp?issn=0973-709x&year=2025&volume=19&issue=8&page=ZC60&issn=0973-709x&id=21415 |
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| Summary: | Introduction: Computer-Aided Designing/Computer-Aided Manufacturing (CAD/CAM) technology has revolutionised the practice of restorative dentistry. Zirconia has become a popular choice of restorative material due to the various advantages of metal-free dentistry. Postgraduate prosthodontics trainees undergo rigorous training for fixed prosthodontics. Monitoring the tooth preparations of postgraduate prosthodontic trainees is an important component of auditing a dental school’s output and can provide valuable insights into the efficiency of trainees in executing tooth preparations. However, there is a lack of adequate research focusing on tooth preparation by postgraduate prosthodontic trainees.
Aim: The aim of this study was to investigate the quality of tooth preparations performed by postgraduate trainees for monolithic zirconia restorations in order to assess adherence to established tooth preparation guidelines.
Materials and Methods: This retrospective observational study was conducted from 1st May 2022 to 1st June 2024 in the Department of Prosthodontics at Guru Nanak Institute of Dental Sciences and Research, Kolkata, West Bengal, India. A total of 247 Standard Tessellation Language (STL) files containing 279 tooth preparations for monolithic zirconia restorations were retrieved. The preparations were assessed by a single evaluator using 3D designing software (Cerec SW 20.0, inLab SW 20.0, Dentsply Sirona) for occlusal clearance, finish line design, finish line width, finish line quality, surface finish, undercuts, and iatrogenic injury to adjacent structures. A 3D software (Geomagic Control X 2024.1.0) was used to create cross-sections of the prepared tooth from the STL files, and measurements were taken for Occluso-Cervical Height (OCH) and Total Occlusal Convergence (TOC). Data were described descriptively. Additionally, the Mann-whitney U test and Pearson Chi-square test were performed using IBM – International Business Machines SPSS – Statistical Package for the Social Sciences, Version 26 software. All statistical analyses were conducted using a 95% confidence interval, and a p-value < 0.05 was considered statistically significant.
Results: A total of 279 preparations were analysed. The mean TOC of all abutments was 19.43±4.86 degrees. The mean OCH and margin width of all abutments were 4.44±1.18 mm and 0.75±0.24 mm, respectively. A total of 148 (53.34%) abutment teeth exhibited adequate preparation.
Conclusion: The adequacy of tooth preparation by postgraduate trainees is predominantly affected by the quality of TOC, especially in the posterior tooth zone and for vital teeth, followed by OCH and finish line geometry. |
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| ISSN: | 2249-782X 0973-709X |