上颌后牙区倾斜种植的三维有限元分析

背景：上颌后牙区种植时往往存在骨量不足的情况,采用骨增量技术时有时候因为手术创伤或者费用等原因,患者不愿意接受。为此有学者提出倾斜种植技术,但该技术尚未得到大家认可,缺乏相关科学依据。目的：观察上颌后牙区种植体连接不同角度基台时种植体周围骨质的应变情况,分析种植体的安全系数,验证上颌后牙区倾斜种植的可行性。方法：通过建立三维模型,利用有限元软件分析种植体连接不同角度的角度基台时,在相同的力量加载下,观察种植体的安全系数,观察种植体及周围骨质的应力应变情况。结果与结论：种植体连接不同角度基台时,随着基台角度的增大,种植体周围骨质的最大应变值增加明显,种植体的安全系数逐渐减小。建议上颌后牙区不要采用倾斜种植技术。

Three-dimensional finite element analysis of tilted implants in the maxillary posterior region

BACKGROUND： Bone mass deficiency is common during implantation in the maxillary posterior region. Some patients do not want to accept extra surgery for increasing bone because of surgical trauma or medical expenses Technology of the tilted implant has been proposed, but it has not been recognized and has a lack of relevant evidence. OBJECTIVE： To investigate the stress distribution of per-implant bone which is subjected to different loading conditions when the different abutment angulations are applied, and to analyze the safety factor of different implants to verify the feasibility of the tilted implant in the maxillary posterior region. METHODS： The finite element models of the different angulate abutments were established in commercial software packages. The safety factor of implant in the same power load was observed, and stress and strain condition of the implant and the surrounding bone was also observed. RESULTS AND CONCLUSION： With the increased abutment angulation, the maximum strain of pre-implant bone was significantly increased, and the safety factor of implant decreased gradually. Thus, the tilted implant is not recommended in the maxillary posterior region.