Department of Fixed Prosthodontics and Oral Implantology, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho Nishi, Matsudo, Chiba 271-8587 Japan.
Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho Nishi, Matsudo, Chiba 271-8587 Japan.
J Prosthodont Res. 2020 Oct;64(4):359-367. doi: 10.1016/j.jpor.2019.10.003. Epub 2020 Feb 13.
The aim of this study was: (1) to compare the coefficients of friction between commercially pure titanium (cpTi), titanium (Ti) alloy, and yttria-stabilized zirconia (YSZ) and: (2) to investigate the dynamic behavior of an implant system before, during, and after loading, by transient dynamic three-dimensional finite element analysis (FEA).
Coefficients of friction were measured by a ball-on-disk frictional wear testing device. The preload in the screw shaft was calculated from geometric parameters. Two abutment model designs were created, namely a Ti alloy abutment model with a porcelain-fused-to-metal super structure and a YSZ abutment model with a porcelain-fused-to-zirconia super structure. Transient dynamic three-dimensional FEA was performed on ANSYS Workbench Ver. 15.0.
The coefficients of friction of YSZ/cpTi, YSZ/Ti alloy, Ti alloy/cpTi, and Ti alloy/Ti alloy were 0.4417, 0.3455, 0.3952, and 0.3489, respectively. The preload generated in the abutment screw of the FEA model was set to be 158 N. Significantly differences were not found in the maximum von Mises equivalent stress between the Ti alloy and YSZ abutment models before, during, and after loading.
The findings indicate differences in the coefficients of friction of cpTi, Ti alloy, and YSZ before, during, and after loading. Fractures caused by stress did not depend on the use of different materials (Ti alloy and YSZ) at the abutment.
本研究的目的是：（1）比较商用纯钛（cpTi）、钛（Ti）合金和氧化钇稳定氧化锆（YSZ）之间的摩擦系数；（2）通过瞬态三维有限元分析（FEA）研究在加载前、加载中和加载后植入系统的动态行为。
通过球盘摩擦磨损试验装置测量摩擦系数。螺杆中的预紧力由几何参数计算。创建了两个基台模型设计，即具有烤瓷熔附金属上层结构的 Ti 合金基台模型和具有烤瓷熔附氧化锆上层结构的 YSZ 基台模型。在 ANSYS Workbench Ver.15.0 上进行瞬态三维 FEA。
YSZ/cpTi、YSZ/Ti 合金、Ti 合金/cpTi 和 Ti 合金/Ti 合金的摩擦系数分别为 0.4417、0.3455、0.3952 和 0.3489。FEA 模型中基台螺钉产生的预紧力设定为 158 N。在加载前、加载中和加载后，Ti 合金和 YSZ 基台模型的最大 von Mises 等效应力之间没有显著差异。
研究结果表明，cpTi、Ti 合金和 YSZ 在加载前、加载中和加载后的摩擦系数存在差异。由应力引起的骨折并不取决于基台使用的不同材料（Ti 合金和 YSZ）。
