论文部分内容阅读
目的探讨不同洞缘斜面宽度对树脂充填上颌中切牙切角缺损应力的影响。方法选择形态、尺寸正常的上颌中切牙,通过逆向工程技术建立上颌中切牙邻面缺损的三维有限元模型,并对其进行边缘扩展,将其边缘斜面宽度设计为0、1、2、3、4mm;运用三维有限元法分析不同边缘宽度对树脂充填后树脂、粘接界面以及牙体组织最大主应力的影响。结果不同边缘宽度的最大主应力分布相似。树脂的最大主应力主要集中于加载点附近;粘接界面的最大主应力集中于舌侧粘接边缘;牙体组织的最大主应力集中于牙颈部。随着肩台宽度的增加,粘接界面的最大主应力在不断减小,而树脂与牙体组织的最大主应力几乎无变化。结论宽度为3mm的斜面边缘扩展可以有效增加树脂粘接面积,并降低树脂和粘接界面的最大主应力。
Objective To investigate the influence of different widths of bevel edge on the stress of dental implants in resin-filled maxillary incisors. Methods The maxillary central incisor with normal morphology and size was selected and the three-dimensional finite element model of the maxillary central incisor adjacent defect was established by reverse engineering. The edge of the maxillary central incisor was designed as 0,1,2, 3,4 mm. The influence of different edge widths on the resin, bonding interface and the maximum principal stress of dental tissues were analyzed by three-dimensional finite element method. Results The distribution of maximum principal stress at different edge widths is similar. The maximum principal stress of the resin mainly concentrates near the loading point; the maximum principal stress of the bonding interface is concentrated on the lingual adhesive edge; and the maximum principal stress of the tooth tissue is concentrated on the dental neck. With the increase of the width of the shoulder, the maximum principal stress of the bonding interface is decreasing while the maximum principal stress of the resin and the tooth structure is almost unchanged. Conclusion The 3mm wide bevel edge expansion can effectively increase the resin bonding area and reduce the maximum principal stress of the resin and bonding interface.