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Survivability of Lithium Disilicate CAD/CAM Restorations Delivered by Predoctoral Students
Cecilia Tran1, Sunshine Lee1, Feng Gao1
1College of Dental Medicine - Illinois, Midwestern University, Downers Grove, Illinois, USA.
Journal of Dental Education
|March 3, 2025
Summary
This study found that monolithic lithium disilicate (LiDi) restorations made by dental students have a high survival rate, comparable to practicing dentists. Factors related to the provider and patient influenced the longevity of these CAD/CAM restorations.
Area of Science:
- Dental Materials Science
- Digital Dentistry
- Clinical Dentistry
Background:
- Digital workflows are increasingly integrated into dental education.
- Assessing the clinical competence of predoctoral students in digital dentistry is crucial.
- Monolithic lithium disilicate (LiDi) restorations are commonly used in CAD/CAM workflows.
Purpose of the Study:
- To evaluate the survivability of monolithic LiDi restorations.
- To assess restorations prepared and delivered by predoctoral dental students.
- To identify factors influencing restoration longevity.
Main Methods:
- Retrospective study of 3700 monolithic LiDi CAD/CAM restorations.
- Kaplan-Meier survival analysis was used to calculate survivability.
- Cox regression models analyzed provider and patient-related factors.
Main Results:
- The overall survival rate for LiDi CAD/CAM restorations was 92.2% at 98 months.
- Failure modes included debonding (31.6%), LiDi fracture (20%), and recurrent caries (14.6%).
- Provider and patient factors significantly affected restoration survivability.
Conclusions:
- Predoctoral students can deliver LiDi CAD/CAM restorations with comparable survivability to practicing clinicians.
- Provider and patient-related factors are critical determinants of restoration success.
- This highlights the effectiveness of digital dentistry training in dental schools.
