ABSTRACT
PURPOSE: The purpose of this study was to compare the marginal fit of three-unit zirconia fixed dental prostheses (FDPs) fabricated using CAD/CAM and MAD/MAM system. MATERIALS AND METHODS: Dentiform maxillary central and lateral incisor were prepared for 3-unit FDP and fixed in yellow stone. This model was duplicated to epoxy resin die. On the resin die, fifteen 3-unit FDPs were fabricated. Metal-ceramic group was three-unit metal-ceramic FDPs, Everest(R) group was zirconia three-unit FDPs fabricated using the Everest(R) system (Kavo Dental GmbH, Biberach, Germany) and Rainbow(TM) group was zirconia three-unit FDPs fabricated using the Rainbow(TM) system (Dentium Co. Inc., Seoul, South Korea). They were cemented to resin dies with adhesive resin cement. After removing pontics, each retainers were separated and observed under measuring machine (Presize 440C) and analyzed through one-way ANOVA and Duncan test (alpha= .05). RESULTS: Mean values and standard deviations of marginal gap dimensions in each group for three-unit FDPs were 78.5 +/- 11.05 microm for the metal-ceramic group, 59.30 +/- 11.63 microm for the Everest(R) group and 70.34 +/- 13.98 microm for the Rainbow(TM) group. CONCLUSION: 1. The Everest(R) group in comparison with metal-ceramic group showed better marginal fit, which had significant differences (P.05). 3. The mean marginal gap values between Rainbow(TM) group and metal-ceramic group did not showed significant differences (P>.05). 4. The mean marginal gaps of each group were within clinically acceptable range (120 microm).
Subject(s)
Adhesives , Dental Prosthesis , Denture, Partial, Fixed , Formycins , Incisor , Resin Cements , Ribonucleotides , ZirconiumABSTRACT
PURPOSE: The purpose of this study was to evaluate the fit of zirconia core using MAD/MAM system comparing to that of conventional metal-ceramic and CAD/CAM system. MATERIALS AND METHODS: Duplicating the prepared resin tooth, 50 improved stone dies were fabricated. These dies are classified as a group of 5 to create the core. The groups were composed of metal-ceramic, Cercon(R), Ceramill(R), Rainbow(TM), and Zirkonzhan(R). Each core was cemented to stone die, and then, absolute marginal discrepancy was measured with microscope at a magnification of x50. Statistical analysis was done with one-way ANOVA test and Tukey's HSD test. RESULTS: The mean absolute marginal discrepancy for metal-ceramic was 51.97 +/- 23.38 micrometer, for Cercon(R) was 62.16 +/- 25.88 micrometer, for Ceramill(R) was 67.64 +/- 40.38 micrometer, for Rainbow(TM) was 125.07 +/- 42.19 micrometer, and for Zirkonzhan(R) was 105 +/- 44.61 micrometer. CONCLUSION: 1. Fit of margin was identified as in the order of metal-ceramic, Cercon(R), Ceramill(R), Zirkonzhan(R), and Rainbow(TM). 2. Absolute marginal discrepancy of the zirconia core that designed by MAD/MAM system had significant differences in order of Ceramill(R), Zirkonzhan(R), and Rainbow(TM). 3. The mean absolute marginal discrepancy between Cercon(R) and Ceramill(R) did not show significant differences.