动态载荷下不同材料修复非龋性颈部缺损有限元分析

Estimation of Biomechanical Behavior in Non-carious Cervical Lesions Restored by Different Materials:A 3D Finite Element Analysis

目的:通过三维有限元模拟口腔咀嚼环境,采用不同材料修复非龋性颈部缺损后进行动态加载,研究各咀嚼阶段下颌前磨牙生物力学性能,为临床选择合适的修复材料提供参考。方法:以右下颌第二前磨牙颈部缺损模型为对照组(Control),IPS e.max(A)、Celtra Duo(B)、Filtek Z350树脂块(C)、Lava Ultimate(D)和Filtek Supreme XT(E)修复缺损为实验组;模拟一个咀嚼周期T=0.875 s内各模型的应力应变趋势,并进行力学分析。结果:同一时期,各模型剩余牙体组织及修复材料应力变化均表现相同趋势:Control>A>B>C>D>E;同一模型,不同咀嚼阶段各模型组应力值为Ⅳ>Ⅲ>Ⅱ。结论:与牙体弹性模量相近的材料可获得与牙体相似的应力分布,冲击载荷影响应力分布。

Objective:To study the biomechanical properties of different materials to repair non carious cervical defects of right mandibular second premolar with different loadings.Methods:The neck defect model at right mandibular second premolar was used.The non treatment was set as Control group,and IPS e.max(D),Celtra Duo(B),Filtek Z350 resin block(C),Lava Ultimate(D),and Filtek Supreme XT(E)filling were set as experimental group.An instantaneous dynamic loading was performed to investigate the stress distribution within a specific period(T=0.875 s).Results:During the same period,the stress values within remaining teeth and materials were the same,i.e.Control>A>B>C>D>E.For each group,the stress values within different periods wereⅣ>Ⅲ>Ⅱ.Conclusion:The materials with similar elastic modulus to that of teeth showed better stress distribution,and the impact load affects the stress distribution.