Marginal fit of anterior 3-unit fixed partial zirconia restorations using different CAD/CAM systems.
- Author:
Tae Jin SONG
1
;
Taek Ka KWON
;
Jae Ho YANG
;
Jung Suk HAN
;
Jai Bong LEE
;
Sung Hun KIM
;
In Sung YEO
Author Information
- Publication Type:Original Article
- Keywords: Marginal fit; CAD/CAM; Zirconia FPD
- MeSH: Denture, Partial, Fixed; Incisor; Resin Cements; Zirconium
- From:The Journal of Advanced Prosthodontics 2013;5(3):219-225
- CountryRepublic of Korea
- Language:English
- Abstract: PURPOSE: Few studies have investigated the marginal accuracy of 3-unit zirconia fixed partial dentures (FPDs) fabricated by computer-aided design/computer-aided manufacturing (CAD/CAM) system. The purpose of this study was to compare the marginal fit of zirconia FPDs made using two CAD/CAM systems with that of metal-ceramic FPDs. MATERIALS AND METHODS: Artificial resin maxillary central and lateral incisors were prepared for 3-unit FPDs and fixed in yellow stone. This model was duplicated to epoxy resin die. On the resin die, 15 three-unit FPDs were fabricated per group (45 in total): Group A, zirconia 3-unit FPDs made with the Everest system; Group B, zirconia 3-unit FPDs made with the Lava system; and Group C, metal-ceramic 3-unit FPDs. They were cemented to resin dies with resin cement. After removal of pontic, each retainer was separated and observed under a microscope (Presize 440C). Marginal gaps of experimental groups were analyzed using one-way ANOVA and Duncan test. RESULTS: Mean marginal gaps of 3-unit FPDs were 60.46 microm for the Everest group, 78.71 microm for the Lava group, and 81.32 microm for the metal-ceramic group. The Everest group demonstrated significantly smaller marginal gap than the Lava and the metal-ceramic groups (P<.05). The marginal gap did not significantly differ between the Lava and the metal-ceramic groups (P>.05). CONCLUSION: The marginal gaps of anterior 3-unit zirconia FPD differed according to CAD/CAM systems, but still fell within clinically acceptable ranges compared with conventional metal-ceramic restoration.
