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目的采用三维有限元方法建立平台转换种植系统的模型,分析平台转换种植系统应用于前牙时,不同加载时种植体植入不同深度的应力分布情况。方法利用Solidwork2007设计软件和Ansys Workbench有限元分析软件,分析平台转换种植体分别在植入牙槽嵴水平、牙槽嵴下1 mm(minus1)、牙槽嵴下2 mm(minus2)时的应力分布情况,以常规种植体为对照组。结果平台转换种植体中牙槽嵴顶骨质的应力值随种植体植入深度加深而有效降低,且比常规组小,而常规组随种植体深入种植应力没有发生明显变化。垂直加载下,各个模型中平台转换基台的应力分布基本相似,与种植深度无明显的相关性,而常规基台的应力分布随着种植深度的下移呈逐渐上移的趋势;各个种植深度中两组种植体、松质骨的应力分布情况基本相似,与种植深度无明显的相关性;在平台转换组中,皮质骨的应力分布随种植深度的下移而下移,而常规组中应力始终集中于牙槽嵴顶与基台相接处没有变化,且其应力分布比平台转换组集中。水平加载下各模型的应力分布规律与垂直组相似,不同的是基台、种植体的最大应力值主要集中在他们相应部位的唇侧。皮质骨中,唇侧的应力明显较垂直加载组集中。结论平台转换种植体植于牙槽嵴顶下水平可以改善牙槽嵴顶应力分布情况,比常规种植体有明显的优势,水平方向的分力将增加牙槽嵴顶骨组织受力,应尽量避免。
OBJECTIVE To establish a three-dimensional finite element model of platform conversion planting system and analyze the stress distribution of implant implantation at different depths when the platform conversion planting system is applied to anterior teeth. Methods Using Solidwork 2007 design software and Ansys Workbench finite element analysis software, the stress distributions of transplanted implants at the level of alveolar ridge, alveolar ridge 1 mm (minus1) and alveolar ridge 2 mm (minus2) were analyzed respectively. The situation, with conventional implants as the control group. Results The stress of alveolar crest in the platform-changed implants decreased with the deepening of implants, and was less than that of the conventional implants. However, there was no significant change in the implants stress in the conventional group with implants. Under vertical loading, the stress distributions of the platform abutments in each model are basically similar and have no obvious correlation with the planting depth. However, the stress distribution of the conventional abutments tends to move upwards with the planting depth down. The planting depth The stress distributions of the two groups of implants and cancellous bone were basically similar and had no significant correlation with the depth of implantation. In the plateau transformation group, the stress distribution of cortical bone decreased with the depth of implantation, while in the conventional group Stress always focused on the alveolar crest and abutment at the abutment has not changed, and its stress distribution than the platform conversion group focus. The stress distribution of each model under horizontal loading is similar to that of the vertical group except that the maximum stress of the implant is mainly concentrated on the labial side of their corresponding parts. Cortical bone, the labial stress was significantly higher than the vertical loading group. CONCLUSION: Transplantation of implants at the level of alveolar crest can improve the stress distribution in alveolar crest, which has obvious advantages over conventional implants. The component of horizontal direction will increase the stress of alveolar crest bone tissue and should be avoided as much as possible .