摘要
目的:研究锥形固位、平台转移种植体的不同连接设计对基台及基台螺丝受力情况的影响。方法 :建立平台转移量分别为0.2、0.4、0.6、0.8、1.0 mm并对应基台锥度分别为6°、8°、10°的种植体模型,分析各组模型受不同载荷时,基台及基台螺丝von-Mises应力及应变情况。结果:随着平台转移量增大,基台与基台螺丝峰值von-Mises应力及应变增大,且平台转移量≥0.8 mm的模型在水平向力作用下,其峰值von-Mises应力高于690 MPa。水平向加力时,应力与应变随平台转移量增大的幅度最大,斜向加力时次之,垂直向加力时最小。81.67%的模型基台应力集中于基台颈部;所有模型基台螺丝应力均集中于基台螺丝头部与体部转折处。结论:平台转移量增大使基台与基台螺丝在咬合过程中受力增大。为了减少种植修复后机械并发症的发生,建议在一定范围内选用平台转移量小的种植体。当平台转移量≥0.8 mm时,基台与基台螺丝最大应力超过纯钛的屈服强度,临床上应慎用该设计。
PURPOSE: This experiment studied the influence of different connection designs of the tapered retention and platform transfer implant on the stress of the abutments and abutment screws. METHODS: Implant models(Platform-switching: 0.2, 0.4, 0.6, 0.8, 1.0 mm;Taper:6°,8°,10°) were established, and Von-mises stress and strain of abutment and abutment screw under different loads were analyzed. RESULTS: With the increase of the platform-switching amount, the peak von-Mises stress and strain of abutment and abutment screw increased. The peak von-Mises stress of the model with platform transfer≥0.8 mm was higher than 690 MPa. In addition, the variation amplitude was horizontal loading>oblique loading >vertical loading. The maximum stress of the abutment was concentrated at the neck of the abutment in 81.67%models. The stress of the abutment screw was concentrated at the turning point of the head and body of abutment screw in all models. CONCLUSIONS: The increase of the amount of platform switching makes the abutment and the abutment screws bear more force in the occlusion process. Therefore, in order to reduce the occurrence of mechanical complications after implantation and restoration, the implant system with the minimum amount of platform transfer should be selected within a certain range. The maximum stress on the abutments and screws exceeds the yield strength of pure titanium in implants with platform-switching amount greater than 0.8 mm, indicating that this design should be selected prudently in clinical practice.
作者
高远
陈杰
王高琦
李云凯
卞翠荣
GAO Yuan;CHEN Jie;WANG Gao-qi;LI Yun-kai;BIAN Cui-rong(LDepartment of Prosthodontics,Qilu Hospital of Shandong University,Jinan 250012,Shandong Province;Department of Prosthodontics,Peking University School and Hospital of Stomatology,National Center of Stomatology,National Clinical Research Center for Oral Diseases,Beijing 100081;Shanghai Xinli Power Equipment Research Institute,Shanghai 200125;School of Mechanical Engineering,Jinan University,Jinan 250022,Shandong Province,China)
出处
《上海口腔医学》
CAS
北大核心
2021年第5期481-487,共7页
Shanghai Journal of Stomatology
基金
山东省自然科学基金(ZR2018MH023)。
关键词
平台转移
锥度
基台
种植体
有限元分析
Platform switching
Taper
Abutment
Implant
Finite element analysis
