下颌第一磨牙半切术后不同修复设计的光弹性应力分析

目的:研究下颌第一磨牙半切术后不同修复设计对牙槽骨应力的影响。方法:运用光弹应力冻结切片法,分析⑤⑥⑦、⑤⑥、⑥⑦、⑥固定桥修复模型的第一磨牙半切术后余留根牙槽骨应力分布状况。结果:双端固定桥修复模型(⑤⑥⑦、⑤⑥)的基牙周围牙槽骨的应力值低于单端固定桥(⑥⑦、⑥)(P<0.05);单端固定桥⑥⑦、⑥应力值间有显著差异(P<0.05);双端固定桥⑤⑥⑦、⑤⑥应力值间无显著差异(P>0.05)。结论:磨牙半切术后在临床上应选用双端固定桥的修复设计。

The photoelastic stress analysis of various prosthodontia design for mandibular first molar with hemisection

Objective To investigate the influences of the stress on alveolar bone which was caused by various prosthodontia design for mandibular first molar after hemisection. Methods In four kinds of prosthodontia design models, stress distributions in the remaining sections of the alveolar bone of the mandibular first molar with hemisection models were evaluated. Results The stress values of mandibular first molar's alveolar bone in rigidly fixed bridge design model was much lower than that in free-end fixed bridge(P<0.05).There is also significance difference between two kinds of free-end fixed bridge(P<0.05).However, no significance difference existed between the two kinds of rigidly fixed bridge(P>0.05). Conclusion In clinical application, rigidly fixed bridge should be adopted for mandibular first molar with hemisection.