Department of Oral and Maxillofacial Surgery, University Hospital Freiburg, Hugstetter Str. 55, 79106, Freiburg, Germany.
Clin Oral Investig. 2013 Apr;17(3):1017-23. doi: 10.1007/s00784-012-0786-1. Epub 2012 Jul 22.
Position stability of the abutment should be investigated in four implant systems with a conical implant-abutment connection.
Previously developed formulas and an established experimental setup were used to determine the position stability of the abutment in the four implant systems with a conical implant-abutment connection and different positional index designs: The theoretical rotational freedom was calculated by using the dimensions of one randomly selected implant per system for approximated geometric models. Experimentally, the rotation, the vertical displacement, and canting moments of the abutment after multiple repositioning and hand tightening of the abutment screw were investigated.
The experimental rotation and vertical displacement differed between the implant systems tested. The analytical and experimental results for the rotation of the abutment clearly deviated in the three implant systems.
Malpositioning of the abutment was possible in all the implant systems tested. Deviating theoretical and experimental results suggest high manufacturing tolerances during fabrication of the implant components.
Position stability of the abutment is essential for precisely fitting implant-supported superstructures.
研究具有锥形种植体-基台连接的四种种植系统中基台的位置稳定性。
使用先前开发的公式和已建立的实验装置来确定具有锥形种植体-基台连接和不同位置指数设计的四种种植系统中基台的位置稳定性:通过使用每个系统中一个随机选择的种植体的尺寸为近似几何模型来计算理论旋转自由度。实验中,研究了基台螺丝多次重新定位和手动拧紧后基台的旋转、垂直位移和倾斜力矩。
测试的种植系统之间基台的实验旋转和垂直位移存在差异。三种种植系统中,基台旋转的分析和实验结果明显存在差异。
在所有测试的种植系统中都可能出现基台定位不当的情况。理论和实验结果的偏差表明在制造种植体部件时存在较高的制造公差。
基台的位置稳定性对于精确拟合种植体支持的上部结构至关重要。