A comparison of the fidelity between various cores fabricated with CAD/CAM systems

Park, Sun Hee; Lee, Kyu Bok

Abstract

STATEMENT OF PROBLEM: Recently, various all-ceramic crowns fabricated with CAD/CAM systems have come into wide use in dental clinic. However, there are only few domestic studies on CAD/CAM restorations. PURPOSE: Purpose of this study was to compare the fidelity (absolute marginal discrepancy and internal gap) between various cores fabricated with different CAD/CAM systems (Procera system, Lava system, Cerec inLab system) and conventional metal cast core. MATERIALS AND METHODS: 10 cores per each system were fabricated. The absolute marginal discrepancies were measured using measuring microscope and digital counter. The internal gaps were calculated using a silicone paste. The results were statistically analyzed using the one-way ANOVA test and Tukey's HSD test. RESULTS: Within the limits of this study the results were as follows. 1. The absolute marginal discrepancies were 32.5+/-3.7 micrometer for metal cast core, 72.2+/-7.0 micrometer for Procera core, 40.8+/-5.4 micrometer for Lava core, and 55.3+/-8.7 micrometer for Cerec inLab core. The internal gaps were 38.4+/-5.7 micrometer for metal cast core, 71.4+/-5.3 micrometer for Procera core, 45.9+/-7.3 micrometer for Lava core, and 51.8+/-6.2 micrometer for Cerec inLab core. 2. The fidelity of metal cast core showed the smallest gaps, followed by Lava core, Cerec inLab core, and Procera core. CONCLUSION: The fidelities of 4 core groups were all within the clinically acceptable range (120 micrometer).