Department of Periodontology, Institute of Odontology, The Sahlgrenska Academy at University of Gothenburg, Göteborg, Sweden.
Clin Implant Dent Relat Res. 2012 Jun;14(3):388-94. doi: 10.1111/j.1708-8208.2010.00272.x. Epub 2010 Feb 11.
To evaluate longitudinal changes in tooth/implant relationship and bone topography at single implants with a microthreaded, conical marginal portion (Astra Tech ST® implants, Astra Tech AB, Mölndal, Sweden).
Thirty-one subjects with single implant-supported restorations in the esthetic zone were included. Radiographs obtained at crown installation and 1, 5, and 8 years of follow-up were analyzed with regard to changes in (1) bone level at the implant and adjacent teeth and (2) vertical position of adjacent teeth relative to the single implant.
The mean marginal bone loss amounted to 0.1 mm at both implants and adjacent teeth during the 8 years of follow-up. Regression analysis failed to identify significant explanatory factors for observed variance in bone level change at the adjacent tooth surfaces. Vertical change in position of the teeth relative to the implants was more frequent and significantly greater in incisor compared with premolar tooth region but not associated with gender or age.
The marginal bone level at teeth adjacent to single implants with a microthreaded conical marginal part was not influenced by horizontal and vertical tooth-implant distances. Continuous eruption of adjacent teeth may result in infraocclusal positioning of a single-implant restoration.
评估具有微螺纹、锥形边缘部分的单个种植体（AstraTech ST®植入物，AstraTech AB，Mölndal，瑞典）的牙/种植体关系和骨形貌的纵向变化。
纳入 31 名在美学区域接受单种植体支持修复的受试者。在冠部安装时以及随访 1、5 和 8 年时获得的 X 线片，分析了（1）种植体和相邻牙齿的骨水平变化和（2）相邻牙齿相对于单个种植体的垂直位置的变化。
在 8 年的随访期间，两个种植体和相邻牙齿的平均边缘骨损失均为 0.1mm。回归分析未能确定相邻牙表面骨水平变化的观察到的方差的显著解释因素。与种植体相比，牙齿相对于种植体的位置的垂直变化在切牙区域更为频繁且显著更大，但与性别或年龄无关。
具有微螺纹锥形边缘部分的单个种植体的相邻牙齿的边缘骨水平不受水平和垂直牙种植体距离的影响。相邻牙齿的连续萌出可能导致单个种植体修复体的低位。
