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- 2018
髓腔固位冠及桩核冠修复下颌第一磨牙大面积缺损的生物力学分析
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Abstract:
摘要 目的:利用有限元法对比分析髓腔固位冠及桩核冠对大面积缺损的下颌第一磨牙剩余牙体组织的应力大小及分布的影响。方法:应用CT扫描下颌第一磨牙后建立三维有限元模型并以完整牙齿作为对照组,模拟根管治疗过程后建立3种缺损的模型作为实验组:近远中壁缺损(A)组、颊壁近中壁缺损(B)组、颊壁及近远中壁缺损(C)组,分别采用髓腔固位冠及桩核冠修复。载荷1以200N的总载荷垂直向加载模拟正中咬合;载荷2以200 N的总载荷与牙长轴成45°斜向加载模拟侧方咬合,应用Abaqus软件分析剩余牙体组织的von Mises应力和最大主应力的大小及分布情况。结果:髓腔固位冠修复后牙体组织所受应力高于桩核冠,甚至可高出1倍;髓腔固位冠修复后应力集中于髓室底,桩核冠修复后应力集中于远中根尖1/3。结论:髓腔固位冠和桩核冠均是下颌第一磨牙大面积缺损可选择的修复方案,桩核冠对牙体组织具有更好的保护作用
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