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目的:探讨残根长度对桩核单冠及桩核联冠修复后应力分布的影响。方法:建立不同长度残根的三维光弹模型,对其进行常规桩核单冠及桩核联冠修复,运用光弹应力分析法分析修复后应力分布的影响。结果:正常长度残根应力峰值与天然牙无明显区别(P>0.05),缩短1/6残根应力峰值小于天然牙2倍,缩短2/6残根应力峰值单冠修复略大于天然牙的2倍,联冠修复小于对照组2倍,缩短3/6残根应力峰值单冠修复远大于天然牙的2倍,联冠修复略大于对照组2倍。结论:正常长度残根,缩短1/6残根可用桩核单冠或者联冠修复,缩短2/6残根应慎用桩核单冠修复,可用桩核联冠。缩短3/6残根不能用桩核单冠修复,应慎用桩核联冠修复。
Objective: To investigate the influence of residual root length on the stress distribution after single crown and post-core crown restoration. Methods: A three-dimensional photoelastic model with different lengths of residual roots was established. The conventional crown and post-core and core were repaired. The influence of stress distribution after restoration was analyzed by photoelastic stress analysis. Results: The peak value of residual root length of normal length was not significantly different from that of natural teeth (P> 0.05). The peak of shortening 1/6 residual stress peak was less than 2 times of that of natural teeth and shortened by 2/6. 2 times, the crown repair less than 2 times the control group, shortening the 3/6 residual stress peak single crown repair is much larger than 2 times the natural teeth, the crown was slightly larger than the control group 2 times. Conclusion: The normal length of the root, the shortening of 1/6 residual roots can be single crown or crown can be used to shorten the 2/6 root remnants should be used with caudal single core crown repair, the crown can be used crown. Shortening of 3/6 stumps can not be repaired with a single post crown, should be used with caution pile crown repair.