人工楔状缺损牙颈部硬组织应力分布的有限元接触分析

目的:分析人工楔状缺损患牙颈部硬组织的应力分布。方法:在下颌前磨牙沿釉牙本质界建立三角形缺损,设计楔状缺损模型,模拟紧咬和咀嚼运动中牙的受力情况,对下颌前磨牙颈部硬组织进行非线性接触分析。结果:模拟紧咬和咀嚼运动中牙的受力情况,釉牙本质界缺损的下颌前磨牙缺损区尖端均存在明显的拉应力集中,应力集中区沿釉牙本质界向方延伸,其中尤以侧方运动工作侧一点接触载荷下的应力集中最为明显,应力值最大。结论:釉牙本质界破坏改变了缺损区牙颈部的应力分布。

Finite element contact stress analysis of simulating teeth with wedge-shaped defects in the cervical region

PURPOSE: To study the distribution of stress of simulating teeth with wedge-shaped defects in the cervical region.METHODS: The models of anisotropic enamel of the mandibular first premolar and the opposite maxillary first premolar crown were created.A defect was introduced into the model of mandibular premolar in the buccal cervical region along the enamelo-dentinal junction.The stress distribution in the cervical region of the mandibular premolar was investigated with regard to different loading conditions simulating working,nonworking and vertical micromotions.In each case,the stroke was applied to the mandibular premolars in a stepping procedure using nonlinear contact analysis.RESULTS: The stresses were concentrated in the defect of the enamel and dentin at the enamelo-dentinal junction(EDJ) in the condition of different loading,especially in the condition of simulating lateral excursion on one contact.CONCLUSION: Undermined cervical EDJ had a significant effect on the stress distribution in the buccal cervical region.