ArRejaie Aws, Alalawi Haidar, Al-Harbi Fahad A, Abualsaud Reem, Al-Thobity Ahmad M
Int J Periodontics Restorative Dent. 2018 November/December;38(6):857–863. doi: 10.11607/prd.2869. Epub 2017 Oct 27.
The purpose of this in vitro study was to measure the marginal and internal fit of single-unit all-ceramic zirconia copings (ZCs) fabricated through three different computer-aided design/computer-assisted manufacture (CAD/CAM) systems using microcomputed tomography (microCT). A total of 10 ZCs were produced for each experimental group. Scanning of the stainless steel (SS) model with its respective copings was conducted with a SkyScan machine. DataViewer software was used to acquire cross-sectional images. Locations of cross-sections for all specimens were standardized to reduce errors. Seven different cross-section locations were selected: four transverse and three sagittal. Adobe Photoshop CS3 was used for the measurements. One-way analysis of variance and Tukey post hoc test were used for the statistical analysis for each group. In addition, t test (α = .05) was used to compare values at each measurement location for the different groups. The results of this study show significant differences in the precision of fit of the experimental groups at the axio-occlusal transition (AOT) location, with a significant gap present in the DeguDent CAD/CAM System compared to the other two systems. Tukey test results indicate a significant difference in the marginal gap between the DeguDent CAD/CAM System and KaVo Everest Dental CAD/CAM System (P = .004). In addition, there is a significant difference in gap size values in the sagittal sections distal to the midline between the DeguDent CAD/CAM System and the Lava Ultimate CAD/CAM System (P = .002). The different CAD/CAM systems showed a clinically acceptable internal fit and marginal adaptation. Different levels of fit were found between the experimental groups. Marginal adaptation was the best in all experimental groups. The gap at the AOT area varied among the three groups, with the DeguDent CAD/CAM System showing the greatest value.
本体外研究的目的是使用微型计算机断层扫描（microCT）测量通过三种不同的计算机辅助设计/计算机辅助制造（CAD/CAM）系统制作的单单位全瓷氧化锆冠（ZCs）的边缘适合性和内部适合性。每个实验组制作10个ZCs。使用SkyScan机器对带有相应冠的不锈钢（SS）模型进行扫描。使用DataViewer软件获取横截面图像。所有标本的横截面位置进行标准化以减少误差。选择七个不同的横截面位置：四个横向和三个矢状面。使用Adobe Photoshop CS3进行测量。对每组进行单因素方差分析和Tukey事后检验进行统计分析。此外，使用t检验（α = 0.05）比较不同组在每个测量位置的值。本研究结果显示，实验组在轴牙合过渡（AOT）位置的适合精度存在显著差异，与其他两个系统相比，DeguDent CAD/CAM系统存在显著间隙。Tukey检验结果表明，DeguDent CAD/CAM系统与KaVo Everest牙科CAD/CAM系统之间的边缘间隙存在显著差异（P = 0.004）。此外，DeguDent CAD/CAM系统与Lava Ultimate CAD/CAM系统之间在中线远端矢状面的间隙大小值存在显著差异（P = 0.002）。不同的CAD/CAM系统显示出临床上可接受的内部适合性和边缘适应性。实验组之间发现了不同程度的适合性。所有实验组的边缘适应性最佳。三组之间AOT区域的间隙各不相同，DeguDent CAD/CAM系统的值最大。
