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Marginal Adaptation and Internal Fit of Zirconia Crowns Fabricated with Different CAD/CAM Systems
Bhagyashree Gurunath Kalsekar1, Papala Sesha Reddy2, S Lakshmi Prasanna3
1Department of Prosthodontics, Bharati Vidyapeeth Deemed to be University Dental College and Hospital, Pune, Maharashtra, India.
Background:
The precision of marginal adaptation and internal fit plays a critical role in the longevity and clinical success of zirconia crowns. Computer-aided design and computer-aided manufacturing (CAD/CAM) systems have revolutionized dental prosthesis fabrication, yet discrepancies exist in their accuracy.
Methods:
A total of 60 zirconia crowns were fabricated on identical typodont molar preparations using three CAD/CAM workflows (n = 20 per group). Marginal adaptation and internal fit were measured using the silicone replica technique under a stereomicroscope. Descriptive statistics were calculated, and comparisons were made using one-way ANOVA followed by post-hoc Tukey test (α = 0.05).
Results:
The mean marginal gap was smallest in the EXOCAD-Amann Girrbach group (45.3 ± 4.8 µm), followed by the 3Shape-Roland group (57.2 ± 5.1 µm), and largest in the CEREC group (69.5 ± 6.3 µm). Internal fit values followed a similar trend: EXOCAD-Amann Girrbach (82.6 ± 6.9 µm), 3Shape-Roland (94.2 ± 7.4 µm), and CEREC (108.5 ± 8.1 µm). Statistically significant differences were observed among all groups (P < 0.001).
Conclusion:
The choice of CAD/CAM system significantly affects the marginal adaptation and internal fit of zirconia crowns. The EXOCAD-Amann Girrbach combination yielded superior outcomes and may be recommended for clinical applications requiring high precision.
