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An In Vitro Comparison of Marginal Fit of Single-Unit Copings Fabricated Using Computer-Aided Design/Computer-Aided
Amit A Kale1, Shashikala Jain1, Navreet Bhasin1
1Department of Prosthodontics, Maharaja Ganga Singh Dental College and Research Centre, Sri Ganganagar, IND.
Cureus
|November 19, 2024
Summary
Computer-aided design/computer-aided manufacturing (CAD/CAM) zirconia crowns offer superior marginal fit compared to direct metal laser sintering (DMLS) and porcelain-fused-to-metal (PFM) restorations. This digital scanning method ensures better longevity for dental prostheses.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Digital Dentistry
Background:
- Accurate marginal fit is critical for the longevity and success of fixed dental prostheses like single-unit crowns.
- Direct digital scanning provides a non-invasive, accurate, and reproducible method for evaluating marginal fit, surpassing traditional indirect techniques.
Purpose of the Study:
- To compare the marginal fit of single-unit copings fabricated using three different methods: CAD/CAM zirconia, DMLS, and PFM.
- To assess the efficacy of direct three-dimensional (3D) scanning in evaluating marginal discrepancies.
Main Methods:
- Sixty typodont teeth were divided into three groups (n=20 each) for single-unit fixed dental prostheses.
- Copings were fabricated using CAD/CAM zirconia, DMLS, and PFM techniques.
- Direct 3D scanning and Exocad software were used to measure marginal discrepancies.
Main Results:
- CAD/CAM zirconia copings exhibited the lowest mean marginal discrepancy (0.0172 mm).
- DMLS copings showed a mean discrepancy of 0.0256 mm, while PFM copings had the highest mean discrepancy (0.0375 mm).
- Statistical analysis (ANOVA and Tukey's post-hoc test) confirmed significant differences in marginal fit among the three groups (p < 0.05).
Conclusions:
- CAD/CAM zirconia crowns demonstrate superior marginal fit compared to DMLS and PFM, attributed to precise digital workflows and material properties.
- DMLS copings offered better marginal fit than PFM, which presented notable gaps due to the inherent limitations of the lost-wax fabrication method.
