[摘要] 目的：研究不同深度的楔状缺损及其尖部牙体组织的应力分布。方法：建立下颌第一前磨牙模式图，选择4种不同深度的楔状缺损，应用二维有限元应力分析法，对楔状缺损及其尖部进行应力分析。结果：随着楔状缺损深度的增加，缺损应力呈增高的趋势。结论：楔状缺损对牙体破坏的速度是逐渐加快的，临床上应尽早对楔状缺损进行充填修复。

    [关键词] 深度 楔状缺损 应力

    Two-dimensional finite element strain analysis of teeth with different depth of wedge-shaped defects under loading.

    XIA Rong-ming, WU Xiao-bin.

    BeijingNanmofang Hospital, Beijing 100022

    [Abstract]Objective: To study the concentration of strain at the cervix of tooth with wedge-shaped defects and its top end. Methods: Two-finite element models of strain first premolar defected from longitudinal section were developed. Four different depths of wedge-shaped defects were respectively chosen, then the strain variation in defects and their top end was investigated. Results: The strain of wedg-shaped defects and their top end was raised with increasing depth. Conclusion: The rate that defects do damage to teeth is accelerated. In the clinic, wedge-shaped defects should be restored as early as possible.

    [Key words] Depth Wedge-shaped defects Stress

    楔状缺损的病因较多 ......