School of Dental Medicine, University of Connecticut Health Center, Farmington, Connecticut 06030, USA.
Int J Oral Maxillofac Implants. 2013 May-Jun;28(3):661-9. doi: 10.11607/jomi.2370.
The purpose of this experiment was to analyze the mechanics of the ceramic abutment-implant joint and the dimensional changes in the abutment screws from cyclic loading.
Two groups of experimental assemblies were used, one with zirconia abutments and the other with titanium abutments (n = 10). Each specimen consisted of an implant, an abutment, and a metal crown affixed in an acrylic resin base. The specimens were subjected to cyclic loading of 200 N for 1 million cycles at 10 Hz. After loading, a torque-angle signature analysis was done, the dimensions of the screws were measured, and the implant-abutment interfaces were examined with scanning electron microscopy.
There was a statistically significant increase in the total length of the screws: 121 μm in the titanium group versus 88 μm in the zirconia group (P < .004). Microscopic analysis showed collected debris on the zirconia abutment undersurface and the screws. A statistically similar decrease in torque was observed: 18% for zirconia versus 13.5% for titanium. Radiographic microanalysis revealed that the debris collected in the zirconia assemblies was essentially a collection of titanium, vanadium, and aluminum, with traces of zirconium.
While there was a loss of torque in both types of abutments, the stability of the zirconia abutment-implant joint was not affected by the loading. The study provides a better understanding of zirconia abutments, screw designs, and the mechanism holding together the implant-abutment assembly.
本实验旨在分析陶瓷基台-种植体连接的力学性能以及循环载荷下基台螺丝的尺寸变化。
使用两组实验组件，一组为氧化锆基台，另一组为钛基台（n = 10）。每个样本由种植体、基台和金属冠组成，固定在丙烯酸树脂底座上。将标本在 10 Hz 下以 200 N 的循环载荷进行 100 万次循环。加载后，进行扭矩-角度特征分析，测量螺丝的尺寸，并使用扫描电子显微镜检查种植体-基台界面。
螺丝的总长度有统计学意义的增加：钛组为 121 μm，氧化锆组为 88 μm（P <.004）。微观分析显示氧化锆基台下表面和螺丝上有收集的碎屑。扭矩也有统计学上相似的下降：氧化锆组为 18%，钛组为 13.5%。放射微分析显示，在氧化锆组件中收集的碎屑基本上是钛、钒和铝的混合物，有少量的锆。
虽然两种基台的扭矩都有损失，但负载并没有影响氧化锆基台-种植体连接的稳定性。该研究提供了对氧化锆基台、螺丝设计以及固定种植体-基台组件的机制的更好理解。
