%0 Journal Article
%T Marginal discrepancy and microleakage in crown-copings fabricated by three CAD/CAM systems: An <i>in vitro</i> study
%A Marcela Herrera
%A Alfonso Catal¨¢n
%A Maritza Flores
%A Alejandra Mart¨ªnez
%J Open Journal of Stomatology
%P 163-169
%@ 2160-8717
%D 2012
%I Scientific Research Publishing
%R 10.4236/ojst.2012.23030
%X The purpose of this study was to evaluate and compare the microleakage and marginal discrepancy of ceramic crown-copings fabricated by three different CAD/CAM systems. Material and methods: Thirty extracted premolars were prepared for complete all-ceramic crowns with: total convergence 10-degree, 2 mm occlusal reduction, 4.5 mm height, 1.3 mm circular reduction and chamfer marginal preparation. They were divided into three groups and each group (n = 10) received a ceramic crown-coping fabricated by one of three CAD/CAM systems: Procera, KaVo Everest and Cerec inLab. The copings were cemented with Panavia F 2.0. After thermal cycling, the teeth were immersed in 2% basic fuchsine dye for 24 hours. Microleakage was scored using a five-point scale and evaluated under a stereomicroscope at ¡Á18. Marginal discrepancies were assessed with scanning electronic microscope at ¡Á150, with measurements at 50 different points. Data were subjected to a chisquare test, Kolmogorov-Smirnov test and using Rho Spearman¡¯s correlation test (P < 0.05). Results: Cerec inLab CAD/CAM crown-copings showed significant microleakage compared to Procera and KaVo Everest (P = 0.031). No significant differences were observed between Procera and the KaVo Everest system (P > 0.05). No significant differences were found in marginal discrepancies for the Procera (62.58 ¡À 8.98 ¦Ìm) and KaVo Everest systems (65.54 ¡À 18.56 ¦Ìm), (P = 0.941). Significant differences were found for Cerec inLab (132.18 ¡À 27.75 ¦Ìm) compared with Procera and KaVo Everest (P = 0.0001). No correlation between the marginal discrepancies and microleakage for the three CAD/CAM crown-copings systems. Conclusions: Cerec inLab CAD/CAM crown-copings showed significantly higher values for microleakage and marginal discrepancy in comparison with Procera and KaVo Everest CAD/CAM crown-copings.
%K CAD/CAM Copings
%K Microleakage
%K Marginal Discrepancy
%K Panavia F.2
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=22977