Department of Prosthodontics, Munich Dental School, Goethestr. 70, 80336, Munich, Germany.
Hürzeler/Zuhr Private Practice, Rosenkavalierplatz 18, 81925, Munich, Germany.
Clin Oral Investig. 2017 Nov;21(8):2629-2635. doi: 10.1007/s00784-017-2064-8. Epub 2017 Feb 4.
The purpose of this in vitro study was to compare the precision of fit of frameworks milled from semi-sintered regular zirconia and high-translucent (HT) zirconia blanks, fabricated with two different CAD/CAM systems.
Three-unit, posterior fixed dental prostheses (FDP) frameworks were fabricated for standardized dies (n = 11) with two different laboratory computer-aided design (CAD)/computer-aided manufacturing (CAM) systems (Cercon/Ceramill). The replica technique was used to evaluate the marginal and internal fit under an optical microscope. Evaluation of the data was performed according to prior studies at a level of significance of 5%.
The systems showed a statistically significant influence on the internal fit of the frameworks (p ≤ 0.001) and on the marginal fit (p < 0.001). The type of material showed no influence on the marginal fit for the Cercon system (p = 0.636) and on the marginal fit (p = 0.064) and the internal fit (p = 0.316) for the Ceramill system, while regular zirconia from Cercon showed higher internal values than HT zirconia (p = 0.016).
Both investigated systems showed clinically acceptable values within the limitations of this in vitro study. However, one showed less internal accuracy when regular zirconia was used.
本体外研究的目的是比较两种不同 CAD/CAM 系统加工的半烧结常规氧化锆和高透光氧化锆坯料制成的框架的拟合精度。
使用两种不同的实验室计算机辅助设计 (CAD)/计算机辅助制造 (CAM) 系统 (Cercon/Ceramill) 为标准化模具 (n=11) 制作了三单位后固定义齿 (FDP) 框架。复制技术用于在光学显微镜下评估边缘和内部拟合。根据先前的研究，在 5%的显著性水平下对数据进行评估。
系统对框架的内部拟合 (p≤0.001) 和边缘拟合 (p<0.001) 有统计学显著影响。材料类型对 Cercon 系统的边缘拟合 (p=0.636) 和 Ceramill 系统的边缘拟合 (p=0.064) 和内部拟合 (p=0.316) 没有影响，但 Cercon 的常规氧化锆显示出比 HT 氧化锆更高的内部值 (p=0.016)。
在本体外研究的限制范围内，两种研究的系统均显示出临床可接受的值。然而，当使用常规氧化锆时，一个系统的内部精度较低。
