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目的:建立下颌后牙单端固定桥及其支持组织的三维有限元模型,采用瞬态动力学分析,比较单端桥修复前后基牙骨支持组织的应力分布规律。方法:用ANSYS 10.0软件对模型施以不同部位和方向的冲击载荷,分析单端桥基牙骨支持组织的应力大小、分布及变化规律。结果:斜向载荷下,基牙骨支持组织存在明显应力集中;单端桥修复后,应力峰值77.676 MPa位于近缺隙侧基牙的皮质骨颈部;一个咀嚼周期末存在应力残余,其值不显著。结论:单端桥近缺隙侧基牙承受主要应力,载荷方向影响应力大小及分布,应力峰值小于下颌骨应变极限强度。
OBJECTIVE: To establish a three-dimensional finite element model of mandibular single-ended fixed bridge and its supporting tissues, and to analyze the stress distribution of the supporting tissues before and after single-ended bridge restoration by transient dynamic analysis. Methods: The impact loads of different parts and directions were applied to the model by ANSYS 10.0 software, and the stress distribution, distribution and variation regularity of the support structure of single-ended bridge abutment were analyzed. Results: Under diagonal loading, there was significant stress concentration in the support tissues of the abutment. After the repair of the single-ended bridge, the peak stress was 77.676 MPa located in the cortical bone and neck of the proximal crease. There was stress residual at the end of a chewing cycle Not obvious. CONCLUSION: The abutment tooth near the flank end of single-ended bridge is subject to the main stress. The load direction affects the stress distribution and the stress peak value is smaller than the ultimate strength of the mandible.