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目的探讨不同植入扭矩对种植体骨界面生物力学特性的影响。方法采用薄层CT扫描和自主开发的USIS软件建立包含种植体的即刻负载下颌骨三维有限元模型。采用ANSYS软件分析种植体在0、15、25 N.cm 3种植入扭矩下,垂直和颊舌向45°加载150 N力时种植体骨界面von Mises应力、应变值。结果垂直载荷时,3种植入扭矩下的种植体骨界面von Mises应力最大值分别为33.6、56.4和69.6 MPa,应变最大值分别为5 157、8 645、15 630με。颊舌向载荷时,3种植入扭矩下的种植体骨界面von Mises应力最大值分别为95.3、100.6和108.3 MPa,应变最大值分别为17 110、18 690、21 380με。结论种植体植入扭矩的增大会增加种植体骨界面的应力应变值,颊舌向载荷时比垂直载荷时增加明显缓慢。
Objective To investigate the effects of different implantation torques on the biomechanical properties of implant bone interface. Methods Three-dimensional finite element model of mandible immediately loaded with implants was established by thin layer CT scanning and USIS software independently developed. ANSYS software was used to analyze the implant von Mises stress and strain at implanting torques of 0, 15 and 25 N.cm with vertical and bucco-lingual forces of 150 N at 45 °. Results The maximal von Mises stresses of implant implants at three kinds of implantation torque were 33.6, 56.4 and 69.6 MPa respectively, and the maximum strains were 5 157, 8 645 and 15 630 με, respectively. The maximum von Mises stress at implanting interface was 95.3, 100.6 and 108.3 MPa, respectively, and the maximum strains were 17 110, 18 690 and 21 380 με, respectively. Conclusion The increase of implants’ implant torque will increase the stress-strain value at the implant-bone interface. The buccolingulence increases more slowly than that under the vertical load.