摘要
在牙科种植领域常使用的种植体材料多为纯钛或钛合金,然而钛金属种植体存在美学缺陷及潜在的致敏可能等问题.氧化锆陶瓷由于其高强度、美观性与生物相容性被认为是钛金属种植体的理想替代品,但目前国内对于氧化锆种植体的研究仍处于起步阶段.本文通过对氧化锆种植体及骨组织进行有限元建模,并对种植体的动态植入过程进行仿真,分析了骨组织内部的应力-应变状况.结果发现,随着植入深度的增加,种植体与骨组织的接触面积增大,松质骨内应力增加.考虑到骨组织的具体结构,将松质骨内的最大应力-应变作为分析的主要对象,结合损伤分析,对种植体模型进行了优化.此外,还设计了3种具有自攻刃设计的种植体模型,分别进行应力应变分析后确定了最优设计.之后建立了具有自攻刃设计的种植体模型,并模拟了临床的3种植入方案:螺纹成形、螺纹切割、螺纹成形与切割进行分析,通过分析得到螺纹成形与切割种植方案更为安全的结论.本文结果可以指导氧化锆种植体的结构设计以及植入时的条件设定等,为我国自主研发的氧化锆种植体进行了理论指导,为其早日进行临床应用指明了方向.
In the field of dental implantology, the most commonly used implant materials are pure titanium or titanium alloy, however, implants composed of titanium have aesthetic defects and potential allergic problems. Zirconia ceramic implants are considered to be an ideal alternative to titanium implants due to their high strength, aesthetics and biocompatibility, but the research on zirconia implants in China is still in its start-up phase comparing with titaniumbased implants. In this paper, the stress-strain conditions inside the bone tissue in which the zirconia implants were placed were analyzed by finite element modeling of zirconia ceramic implants as well as the bone tissue and simulation of the dynamic implant placement process. The finite element simulation results shows that the contact area between the implant and the bone tissue increased with the increase of the implantation depth, and the stress within the cancellous bone increased. Considering the specific structure of the bone tissue, the maximum stress and strain within the cancellous bone was taken as the main object of the analysis, then the implant model was optimized in combination with the damage analysis method. In addition, three implant models with self-tapping edge design were designed, and the optimal design was determined by stress-strain analysis. The implant models with self-tapping edge design were then simulated and analyzed for three clinical implant scenarios: thread forming, thread cutting, and thread forming and cutting. The analysis of three implant models with self-tapping edge design led to the conclusion that the thread forming and cutting implant solutions are safer in the process of clinical implant. The results of this paper can shed light on the structural design of zirconia implants and the setting of implantation conditions, and provide theoretical guidance for the independent development of zirconia implants in China and indicate the direction for their early clinical application.
作者
王天瑜
牛一龙
周健邦
王晓飞
邵丽华
韩建民
Wang Tianyu;Niu Yilong;Zhou Jianbang;Wang Xiaofei;Shao Lihua;Han Jianmin(Institute of Solid Mechanics,School of Aeronautic Science and Engineering,Beihang University,Beiing 100191,China;Key Laboratory of Biomechanics and Mechanobiology,Ministry of Education Beijing Advanced Innovation Center for Biomedical Engineering,School of Biological Science and Medical Engineering,Beihang University,Beijing 100191,China;National Engineering Research Center of Oral Biomaterials and Digital Medical Devices,NMPA Key Laboratory for Dental Materials,Peking University Hospital of Stomatology,Beiing 100081,China)
出处
《力学学报》
EI
CAS
CSCD
北大核心
2022年第1期220-231,共12页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家重点研发计划资助项目(2019 YFE0101100)。
关键词
氧化锆
种植体
有限元
损伤
zirconia
implant
finite element method
damage
