玻璃纤维桩长度和纤维含量对牙体抗折强度的影响

玻璃纤维桩长度和纤维含量对牙体抗折强度的影响

孙宁宁,殷恺,李玉民

天津医科大学一中心临床学院

收稿日期:2013-10-22 修回日期:2013-12-27 出版日期:2014-05-15 发布日期:2014-05-15
通讯作者: 殷恺

Effects of different length and fiber content of glass fiber posts on the fracture resistance of teeth

Received:2013-10-22 Revised:2013-12-27 Published:2014-05-15 Online:2014-05-15

孙宁宁,殷恺,李玉民. 玻璃纤维桩长度和纤维含量对牙体抗折强度的影响[J]. .

摘要/Abstract

摘要： 　　【摘要】目的研究玻璃纤维桩长度和纤维含量对牙齿抗折强度的影响，探索进行牙体缺损修复所适宜的玻璃纤维桩长度和纤维含量。方法选择42颗因正畸拔除完整的下颌前磨牙，随机分为3个 (A、B、C) 实验组。自釉牙骨质界上2mm截冠后行完善的根管治疗，进行桩道预备，桩道深度分别为A组10mm、B组8mm、C组6mm。每一个实验组再各分成2个亚组，A1、B1、 C1组应用纤维含量42%玻璃纤维桩，A2、B2、C2组应用纤维含量75%玻璃纤维桩，进行桩粘接、树脂核塑型及金属冠修复。将所有实验标本制成试件，置于万能材料实验机上进行抗折裂强度测试，记录牙根折断时的瞬间压力值以及试件折断的模式。结果玻璃纤维桩修复后的牙体抗折强度，A组 (3211.16±378.94) N高于B组(1843.22±359.61) N及C组(1251.82±217.48) N（P< 0.05），B组高于C组（P< 0.05）；纤维含量75%玻璃纤维桩(2328.62±827.98) N高于纤维含量42%玻璃纤维桩(1902.17±891.21) N（P< 0.05）。结论用玻璃纤维桩修复缺损牙体时，在一定范围内，桩的长度越长，牙体抗折强度越大。纤维含量75%玻璃纤维桩修复后牙体抗折强度大于纤维含量42%玻璃纤维桩。

关键词: 玻璃纤维桩, 纤维桩长度, 弹性模量, 抗折强度, 折裂模式

Abstract: [Abstract] Objective To explore the influence of different glass-fiber post lengths and the content of fiber on teeth fracture resistance, and investigate the optimal glass-fiber post length and the content of fiber when apply fiber post restorative treatment．Methods Forty-two intact single canal mandibular premolars were collected from orthodontic patients．All the teeth were endodontically treatment after cut off the crowns from the 2mm above cemento—enamel junction．Divided the mandibular premolars randomly into three experimental groups (A, B, C) 14teeth a group．The experimental groups were post lengths of 10mm(1onger than 1／1 clinical crown length),8mm(1／1 clinical crown length)and6mm (shorter than 1／1 clinical crown length) respectively with 3# fiber Post drill．Each experimental group was averagely divided into two subgroups (A1, A2, B1, B2, C1, C2 )．Group A1, B1,and C1were restored with the 42% glass fiber post, group A2, B2, C2 with 75% glass fiber post．And then,all of them were restored with resin cores and metal crowns．Fracture resistance was measured with universal testing machine and recorded the root fracture pressure data and the mode of all the teeth．Results Fracture resistance of group A of restoration was significantly lower than that of B group and C group(P<0.05)．Fracture resistances of group B was significantly lower than that of C group (P<0.05)．Conclusion Within a certain range, the longer the length of pile, tooth fracture resistance is greater when we use them to restore dental defects.The fracture resistance of fiber content75% is better than the fiber content42%．

Key words: Glass fiber post, Fiber post length, Elasticity Modulus, Fracture resistance, Fracture mode