Influence of Convergence Angle and Cement Space on Margin and Internal Adaptation of CAD/CAM All-ceramic Crowns

VernacularTitle:聚合度和隙料厚度对计算机辅助设计与制作全瓷冠边缘和内部适合性的影响
Author: Yajun ZHANG ¹ ; Zhi QU
Author Information

1. 锦州医科大学附属第二医院修复科
Keywords: all-ceramic crown; convergence angle; cement space; marginal fit
From: Journal of China Medical University 2017;46(10):921-923
CountryChina
Language:Chinese
Abstract: Objective To study the influence of the convergence angle and cement space on the fit of CAD/CAM all-ceramic crowns.Methods The PMMA resin was produced in two groups,group A (2 degrees) and group B (4 degrees),30 in each group,and each group was divided into 3 sub-groups A 1,A2,A3;or B 1,B2,B3.Each subgroup included 10 patients with a CAD/CAM all-ceramic crown with PMMA resin generation type,but the cement space was 40 μm,60 μm,or 80 μm.The internal clearance edge of the double color silicone rubber impression reproduction technology of the all-ceramic crown was observed under the microscope.Analysis Micro-image software was used to measure the edge gap,and the resulting data were analyzed using SPSS 20.0 software.Results When the cement space is the same,the difference between 2 degrees and 4 degrees was statistically significant.Conclusion The fit is the best when the cement space is 60 μm and the convergence angle space is 4 degrees.