In-vitro study on tooth fracture of bridge abutment tooth

建立三维有限元模型，分析基牙和牙槽骨周围的应力分布，记录应力条纹级数。选择金属核和复合树脂核，包括纤维桩（核材料）和氧化锆（桥材料）。模型材料的选择应使其与牙槽骨、牙根、金属核、纤维桩、复合树脂的弹性模量比值一致。此外，有必要寻找杨氏模量与牙槽骨模型处于相同水平的材料，改变环氧树脂、硬化剂和软化剂的基质的比例，并测量混合物的杨氏模量。金属核和含纤维树脂核基牙的应力分布根颈区和牙槽骨尖区的桩钉数量不同。

Two-dimensional simulation models of three-unit bridges were constructed, and stress distribution around the abutment teeth and alveolar bone was analysed and the fringe orders were recorded. Metal Core and composite resin core including a fiber post (core materials) and zirconium oxide (bridge material) were selected. Materials of this model were chosen so that it might become the same as the ratio of Young's modulus of alveolar bone, dental root, metal core, Fiber post, and composite resin. Moreover, it was necessary to search a material with the Young's modulus at the same level as an alveolar bone model, the ratio of the matrix of the epoxy resin, the hardener, and the softener was changed and measured the Young's modulus of mixtures.As a result, stress distribution of the abutment tooth with metal core and resin core including a fiber-post was different at cervical area of the root and apical area of the alveolar bone.