纤维桩不同长度对纤维树脂桩核修复体抗折能力的影响

Evaluation of Different Post Lengths' Effect on Fracture Resistance of a Fiber Post System

目的:评价侧向加载条件下纤维桩在根管内的长度对纤维桩复合树脂核修复体抗折性能的影响。方法:选择下颌单根管前磨牙36颗,随机分为6mm、9mm和12mm的3个组,将离体牙行纤维桩修复后使用速率为0.2mm/min的135°角侧向加载。结果:桩长度为6mm组的荷载力值明显的低于其余2组的荷载力值,其差异有统计学意义(P<0.05)。结论:对于纤维桩复合树脂核修复体,当桩在根管内的长度小于临床牙冠时,修复体的抗折能力较低,因此,临床上尽可能的达到一定的长度,以消除临床失败几率。

Objective： To evaluate,the influence of different post lengths upon root fracture resistance. Methods： Thirty six recently extracted single rooted lower premolars from orthodontic patients were divided into 3 groups （6mm,9mm,12mm）, 12 teeth each. The specimens were tested in a universal test machine and all samples were loaded until failure. Results： Posts shorter than clinical crown length, demonstrated root fracture under significantly lower loading forces（P〈0.05）. Conclusion： Usage of posts shorter than clinical crowns should be avoided to eliminate clinical failure.