Hartung F, Kordass B
Center for Applied Informatics, Flexible Learning and Telemedicine, CIFT-STZ, Ernst Moritz Arndt University, Greifswald, Germany.
Int J Comput Dent. 2006 Apr;9(2):129-36.
The objective of this study was to compare resulting contact point patterns in the context of crown production with the Cerec 3D system. The contact surface patterns of full-ceramic crowns milled with the Cerec 3D system were examined for agreement with the corresponding virtually produced crowns.
The agreement was determined with regard to the parameters number, size, position, and shape. Twenty-eight models were mounted centrally in a mechanical articulator. In these model cases, at least one second premolar and one first molar in the maxilla and mandible had to be prepared for crown production (preparation). A total of 50 teeth was prepared. Crowns were then designed with the aid of the Cerec 3D system. The crown designs were milled and integrated in the model. Silicone bite registrations, the contact point patterns of which were compared with the virtually designed crowns, were produced in static occlusion in the region of the crowns. Different evaluation methods were used for the comparison.
There was an agreement of 78% with regard to number, 76% in terms of localization, 65% regarding size, and 65% in terms of shape.
It was thus confirmed that very good, highly reproducible results can be achieved with the Cerec 3D system.
本研究的目的是在全瓷冠制作过程中，比较使用Cerec 3D系统所产生的接触点模式。检查使用Cerec 3D系统研磨的全瓷冠的接触表面模式，以确定其与相应虚拟制作的全瓷冠是否一致。
从数量、大小、位置和形状等参数方面确定一致性。将28个模型居中安装在机械咬合架上。在这些模型病例中，上颌和下颌至少各有一颗第二前磨牙和一颗第一磨牙需要预备全瓷冠（预备）。总共预备了50颗牙齿。然后借助Cerec 3D系统设计全瓷冠。将设计好的全瓷冠研磨并安装到模型中。在全瓷冠区域的静态咬合状态下制作硅橡胶咬合记录，并将其接触点模式与虚拟设计的全瓷冠进行比较。采用不同的评估方法进行比较。
在数量方面的一致性为78%，定位方面为76%，大小方面为65%，形状方面为65%。
由此证实，使用Cerec 3D系统能够获得非常好的、高度可重复的结果。
