上颌第一前磨牙纵折黏结的应力分析

Three dimensional finite element stress analysis in the vertical fractured first premolar after bonding and replantation

目的:分析上颌第一前磨牙纵折黏接修复后牙体各部位的应力改变。方法:在上颌第一前磨牙纵折模型上,假设分别由ClearfilSEBond和SuperBondC&B代替折裂缝处,并进行垂直和侧向加载,采用三维有限元法计算牙体各部位的应力变化。结果:黏结后的纵折牙垂直加载和侧向加载时,牙体应力值和应力改变趋势与正常牙模型相似,ClearfilSEBond黏结的纵折牙应力变化趋势更接近正常牙体。结论:黏结再植术治疗纵折后牙是有效的,治疗时应选用弹性模量与牙本质较接近的黏结材料,以减少破坏应力,提高纵折牙的远期治疗效果。

PURPOSE： To evaluate the change of stress distribution after bonding and replantation of vertical fractured first maxillary premolar. METHODS： The stress distribution in two types of loading and different treatments on the vertical fractured first maxillary premolar were analyzed by three dimensional finite element. The gap was respectively filled with Clearfil SE Bond and Super Bond C＆B ;and vertical and lateral stress force was calculated. RESULTS： The result of the FEM study of adhesive fracture tooth indicated that the stress distribution was similar to the normal tooth, Clearfil SE Bond was better than Super Bond C＆B. CONCLUSION： The treatment of bonding and replantation for vertical fractured tooth is effective.