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- 2016
“All-on-4”在不同骨质条件下应力分布的三维有限元分析
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Abstract:
摘要 目的:建立“All-on-4”种植三维有限元模型,研究不同骨质条件下远中种植体倾斜角度及修复体悬臂梁长度的变化对种植体及周围骨组织应力分布的影响,为临床提供依据。方法:CBCT扫描无牙颌下颌骨标本,将获取的DICOM数据图像,导入Mimics软件,进行三维重建,运用Geomagic studio软件进行实体化处理,利用Unigraphics及ANSYS Workbench软件模拟“All-on-4”种植建立三维有限元模型。设定修复体牙弓长度不变,在Ⅱ、Ⅲ类骨条件下,分别调整两个远中倾斜种植体倾斜角度及悬臂梁长度,在双侧悬臂梁末端施加150 N静载荷,对比分析种植体及周围骨组织应力分布规律。结果:当远中种植体倾斜角度为30°、45°及60°时,修复体悬臂梁长度分别为10.8 mm、8 mm及6.3 mm,Ⅱ类骨质条件下皮质骨应力峰值分别为26.8 MPa、23.5 MPa及16.3 MPa,Ⅲ类骨质条件下皮质骨应力峰值分别为40 MPa、29 MPa及21.8 MPa。结论:骨密度越低,种植体周围皮质骨应力越大;在牙弓长度相同的情况下,增大远中倾斜种植体的植入角度,可以减小修复体悬臂梁的长度,能有效地减小种植体及周围骨组织应力
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