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.
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2014年第1期13-17,共5页
West China Journal of Stomatology
关键词
微种植体
植入角度
锥度
稳定性
micro-implant
inserting angle
taper
stability
