Ⅱ类骨质中正畸微种植体锥度及植入角度对支抗稳定性影响的三维有限元分析  

Effect of taper and inserting angle on stability of micro-implants in type Ⅱ bone with three-dimensional finite element

作　　者：董晶[1] 张哲湛 周国良[3] 

机构地区：[1]连云港市中医院口腔科,连云港222004 [2]上海交通大学医学院附属第九人民医院口腔正畸科,上海200011 [3]中国船舶重工集团公司江苏自动化研究所,连云港222061

出　　处：《华西口腔医学杂志》2014年第1期13-17,共5页West China Journal of Stomatology

摘　　要：目的探讨微种植体锥度和植入角度对Ⅱ类骨质下颌骨中支抗稳定性的影响，为临床选择微种植体最佳锥度与植入角度提供理论依据。方法建立包含正畸微种植体的颌骨三维有限元模型，在植入角度为30°、45°、60°、75°、90°时分别植入不同锥度的微种植体（直径为1．1～1．6mm，锥度为0～0．0625），分析在2N水平力作用下颌骨应力、种植体应力和位移的变化规律。结果植入角度对骨皮质、种植体应力和位移影响较大，植入角度为60。时，应力和位移水平均较小；微种植体锥度的影响与植入角度相关，植入角度为60°时D模型出现应力最小值，分别为5．0134MPa（骨皮质）和25．1310MPa（微种植体），种植体位移与锥度变化趋势呈正比。结论植入角度对支抗稳定性影响显著，60°为较适宜的植入角度；微种植体锥度对稳定性的影响与植人角度相关，锥度为0．0375（最大直径为1．6mm，最小直径为1.3mm）的微种植体更加适用于Ⅱ类骨质颌骨。Objective To evaluate the effect of taper and inserting angle on stability of micro-implants in type Ⅱ bone and to provide theoretical evidence for clinical selection of taper and inserting angle. Methods Three-dimensional finite element models of type Ⅱ bone sections and micro-implants were fabricated. They were designed using different tapers （diameter between 1.1 to 1.6 mm, taper between 0 to 0.062 5） and different inserting angles ranging from 30° to 90° （30°, 45°, 60°, 75°, 90°）. Effects on the maximum von Mises stresses in mandible and micro-implants, as well as on the maximum displacements in micro-implants, were analyzed under an applied 2 N horizontal force. Results The inserting angle had a significant effect on stresses and displacements, with lower distribution of stresses and displacements occurring at 60°. The effect of the taper was also related to the inserting angle. The minimum stresses were 5.013 4 MPa （cortical bone） and 25.131 0 MPa （micro-implant） in model D at 60°. The displacements of micro-implants were proportional to the taper. Conclusion The inserting angle has a significant effect on stability of micro-implants, and the recommended inserting angle is 60°. The influence of taper on the stability of micro-implants is related to the inserting angle. The micro-implant with 0.037 5 taper （maximum diameter is 1.6 mm, minimum diameter is 1.3 mm） is more suitable for type 11 bones.

关 键 词：微种植体 植入角度 锥度 稳定性 

分 类 号：R783.5[医药卫生—口腔医学]