D'Arcy Brian L, Omer Osama E, Byrne Declan A, Quinn Frank
Dublin Dental School and Hospital, Dublin 2, Ireland.
Eur J Prosthodont Restor Dent. 2009 Jun;17(2):73-7.
The objective of this study was to evaluate the reproducibility and accuracy of internal fit using Cerec 3D CAD/CAM (computer aided design/computer aided manufacturing) all-ceramic crowns and to investigate the proximal contact point areas between the crowns and neighbouring teeth, in terms of location and the presence or absence of contact. A total of 48 crowns were milled and divided into two groups of twenty-four each. One group consisted of testing a Control die and the other group consisted of testing single Replica stone die duplicates of the Control die. The Internal Marginal Gap, Axio-Occlusal Transition Gap and Occlusal Gap were measured on each crown in both groups. No significant differences were identified between the mean thickness of the Marginal Gap, the Axio-Occlusal Transition Gap and the Occlusal Gap of the Control die when compared with the Replica dies indicating uniformity and consistency of the accuracy of fit and therefore die replication.
本研究的目的是评估使用Cerec 3D CAD/CAM（计算机辅助设计/计算机辅助制造）全瓷冠时内部适合性的可重复性和准确性，并从位置以及接触的有无方面研究冠与相邻牙齿之间的邻面接触点区域。总共制作了48个全瓷冠，并将其分为两组，每组24个。一组包括测试一个对照代型，另一组包括测试对照代型的单个复制石膏代型复制品。测量了两组中每个全瓷冠的内部边缘间隙、轴（面）-牙合面过渡间隙和牙合面间隙。与复制代型相比，对照代型的边缘间隙、轴（面）-牙合面过渡间隙和牙合面间隙的平均厚度未发现显著差异，表明适合性准确性的均匀性和一致性，因此代型复制良好。
