- 作者：Yasufumi Yamanishi ; Satoshi Yamaguchi ; Satoshi Imazato ; Tamaki Nakano ; Hirofumi Yatani
- 关键词：Biomechanics ; Dental implant ; Finite element analysis ; Occlusal force ; Micromovement
- 刊名：Dental Materials
- 出版年：2012
- 出版时间：November, 2012
- 年：2012
- 卷：28
- 期：11
- 页码：1126-1133
- 全文大小：1336 K
Objectives
Occlusal overloading is one of the causes of peri-implant bone resorption, and many studies on stress distribution in the peri-implant bone by three-dimensional finite element analysis (3D FEA) have been performed. However, the FEA models previously reported were simplified and far from representing what occurs in clinical situations. In this study, 3D FEA was conducted with simulation of the complex structure of dental implants, and the influences of neck design and connections with an abutment on peri-implant bone stress and abutment micromovement were investigated.Methods
Three types of two-piece implant CAD models were designed: external joint with a conical tapered neck (EJ), internal joint with a straight neck (IJ), and conical joint with a reverse conical neck (CJ). 3D FEA was performed with the setting of a ¡°contact¡± condition at the component interface, and stress distribution in the peri-implant bone and abutment micromovement were analyzed.
Results
The shear stress was concentrated on the mesiodistal side of the cortical bone for EJ. EJ had the largest amount of abutment micromovement. While the von Mises and shear stresses around the implant neck were concentrated on the labial bone for IJ, they were distributed on the mesiodistal side of the cortical bone for CJ. CJ had the least amount of abutment micromovement.
Significance
Implants with a conical joint with an abutment and reverse conical neck design may effectively control occlusal overloading on the labial bone and abutment micromovement.