EVALUATION OF THE VERTICAL MARGINAL GAP OF THREE CAD/CAM CERAMIC SYSTEM AFTER CYCLIC LOADING

Emad Eldin Elsharkawy, Ahmad El-Kouedi, Tamer E. Shokry
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Abstract

Objective: The objective of this in vitro study was to evaluate the marginal accuracy of different CAD/CAM ceramic crowns after thermo-mechanical cyclic loading. Material and methods: The marginal accuracy of a polymer-infiltrated ceramic network (PICN) material (Vita Enamic [VE]) was compared to two machinable glass ceramics; Zirconia-reinforced lithium silicate (Vita Suprinity [VS]) and a lithium disilicate glass ceramic (IPS e.max. CAD, IPS). 30 natural premolar teeth of average size were prepared (n=10 each group) by computer numerical control (CNC) to fulfill the criteria of all ceramic crown design. Optical impressions were taken for each tooth preparation using the CAD/CAM scanner. 30 crowns were milled from ceramic blocks based on the optical data. A total of 30 crowns were fabricated using CAD/CAM system, and divided into three groups (IPS e.max, VE and VS). The vertical marginal gap was measured using stereomicroscope before, after cementation and after thermo mechanical cyclic loading. Results: No statistically significant difference in vertical marginal gap within or between groups of three tested materials before, after cementation and after thermo mechanical cyclic loading. Conclusions: Vertical marginal adaptation of all tested ceramics was within the clinically acceptable values.
循环加载后三cad / cam陶瓷系统垂直边缘间隙的评价
目的:评价不同CAD/CAM陶瓷冠在热机械循环加载后的边缘精度。材料和方法:比较了聚合物渗透陶瓷网络(PICN)材料(Vita Enamic [VE])与两种可加工玻璃陶瓷的边缘精度;氧化锆增强硅酸锂(Vita Suprinity [VS])和二硅酸锂玻璃陶瓷(IPS e.max。CAD, IPS)。采用计算机数控(CNC)法制备平均尺寸天然前磨牙30颗(每组10颗),满足全瓷冠设计标准。使用CAD/CAM扫描仪对每个牙齿制备进行光学印模。根据光学数据,从陶瓷块中铣削30个冠。采用CAD/CAM系统制作30个冠状体,分为3组(IPS e.max、VE和VS)。采用立体显微镜测量了胶结前后和热-机械循环加载前后的垂直边缘间隙。结果:三种被试材料在胶结前后和热-机械循环加载后,组内和组间的垂直边缘间隙均无统计学差异。结论:所有测试陶瓷的垂直边缘适应性均在临床可接受的范围内。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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