【摘要】 目的 :明确一段式单桩螺旋形种植牙的骨组织形态、硬度与应力的关系 ,指导种植体的设计与运用。方法 :模型为皮质骨厚度 1～ 2mm ,种植体与牙槽骨直接相接触。种植体根长 10、12、13、14mm ,直径为 3.6、3.7、3.8、3.9、4.0mm的圆柱形 ,冠高为 4mm和 9mm。加载方式为垂直、45°斜向 45°偏心斜向。力量为 2 0 0N。牙槽骨形态 :用CT垂直于牙合平面取自一无附着丧失、正常牙合形的青年男性下颌第一磨牙、上颌切牙。结果 :骨组织的应力主要发生在皮—松质骨交界区和有最大应力的部位 ,松质骨是应力主要承受区。前、后牙牙槽骨的厚度、形态可影响骨组织的应力大小和分布。结论 :在 4种工况条件下与种植体接触的皮—松质骨交界区始终是骨组织最大应力的部位。种植体周的骨弹性模量越高 ,皮质骨的应力也升高。提高种植体弹性模量可以降低皮质骨和松质骨承变的应力。更多还原

【Abstract】 ?Objective: To study the stress distribution of one segment type mono dowel implant with various length and diameter in alveolar bone. Methods: The thickness of cortical bone is 1～2 mm, implant was in close contact with alveolar bone directly. Implants with root length of 10,12,13 and 14 mm, cast diameter of 3.6, 3.7, 3.8, 3.9 and 4.0 mm, corona tall 4 and 9 mm were put into a bone model with alveolar bone. 200 N force was loaded in vertical, 45° oblique and 45° oblique of non center. CT and 3D FEM were used to study the stress distribution and selected the morphology of alveolar bone from first molar of lower jaw and an incisor of maxillary. Results: There was an area of stress in the boundary of the cortical and cancellous bony tissue,horizontal hole. The main region of stress was at the cancellous. Thickness and shape of alveolar bone could affect the distribution of stress. The maximal Von Mises Stress was always in the boundary of cortical and bone that contacted with implant. Higher elastic modulus of bone around the implant had higher stress in cortical stress . Conclusion: The stress of cortical and cancellous bone can be depressed to rise elastic modulus of implant.更多还原