楔状缺损充填治疗后牙颈部硬组织应力分析

Two-dimensional finite element stress analysis of simulating restored teeth with wedge-shaped defects under loads

目的 了解楔状缺损患牙充填治疗后 ,牙颈部硬组织的应力分布。方法 在下颌前磨牙颊舌向纵剖面上设计楔状缺损模型 ,选择复合树脂和玻璃离子水门汀两种材料模拟充填缺损区 ;用二维有限元法对模型受力作用时牙颈部应力做分析。结果 复合树脂充填和玻璃离子水门汀充填均可使缺损附近的应力集中明显改善 ;缺损最深处的最大主应力值分别降至 36 2MPa和 42 5MPa,接近正常牙应力值 32 6MPa。

Objective To study the concentration of stresses at the cervix with simulating restoration of tooth defects Methods A two dimensional finite element model of a mandible first premolar with defect from longitudinal section was developed The model was simulatedly restored, respectively by composite resin and glass ionomer cement, and then investigated stress variation in the cervical area Results In the restored models, both of materials improved the concentration of stresses at the cervical area The composite resin and the glass ionomer cement restorations made the maximum principal stresses declined respectively to 36 2 MPa and 42 5 MPa, which were close to the value of normal tooth in the deepest area of defects Conclusion The concentration of stresses are improved in the cervical area with teeth defects restored