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KMID : 0362420080460030269
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Journal of Korean Academy of Prosthodontics
2008 Volume.46 No. 3 p.269 ~ p.279
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A COMPARISON OF THE FIDELITY BETWEEN VARIOUS CORES FABRICATED WITH CAD/CAM SYSTEMS
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Park Sun-Hee
Lee Kyu-Bok
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Abstract
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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 ㎛ for metal cast core, 72.2±7.0 ㎛ for Procera core, 40.8±5.4 ㎛ for Lava core, and 55.3±8.7 ㎛ for Cerec inLab core. The internal gaps were 38.4± 5.7 ㎛ for metal cast core, 71.4±5.3 ㎛ for Procera core, 45.9±7.3 ㎛ for Lava core, and 51.8±6.2 ㎛ 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 ㎛).
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KEYWORD
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All-ceramic crown, CAD/CAM system, Absolute marginal discrepancy, Internal gap
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