不同长度的玻璃纤维桩修复对下颌前磨牙抗折强度的影响  

Effects of Fracture Resistance on Mandible Premolars Restored with Different Glass Fiber Post Lengths.

作　　者：李张维[1] 吴妹娟[1] 刘雪云[1] 潘宣[1] 李梁[1] 

机构地区：[1]广东药学院附属第一医院口腔科,广州510080

出　　处：《医学研究杂志》2011年第8期111-113,共3页Journal of Medical Research

摘　　要：目的比较玻璃纤维桩长度对牙齿抗折强度的影响。方法选择30颗近期因正畸完整拔除的下颌前磨牙,自釉牙骨质界处截冠后行完善的根管治疗,随机分为A、B、C 3组,每组10颗。对应每组按5mm(短于修复体牙冠的长度),7mm(等于修复体牙冠的长度),9mm(大于修复体牙冠的长度)长度的纤维桩修复,树脂核加金属冠修复外形。自凝塑料包埋后,固定于万能试验机上测试实验牙的抗折强度,记录读数并观察修复体折裂模式。结果 A组的修复体抗折强度低于B组与C组(P<0.05),而B组与C组修复体抗折强度的差异无统计学意义(P>0.05)。结论使用玻璃纤维桩修复缺损牙体时,桩的长度不应短于临床牙冠的长度。Objective To compare the influence of different glass - fiber post lengths on teeth fracture resistance. Methods Thirty extracted human mandible premolars were endodontically treated after being cut off the crowns from the cemento - enamel junction. The teeth were randomly and equally divided into A, B, C groups which were post lengths of 5ram （shorter than 1/1 clinical crown length） , 7ram （ 1/1 clinical crown length） ,and 9mm （ longer than 1/1 clinical crown length） respectively. And then,all of them were restored with resin cores and metal crowns. All the teeth were fixed in a universal text machine after embedded in acrylic resin blocks,which were tested for the fracture resistance,and recorded the counts and observed the fracture mode. 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 and C, however,were not significantly different （P 〉 0.05）. Conclusion Glass fiber post lengths should not be shorter than clinical crowns when we use them to restore dental defects.

关 键 词：玻璃纤维桩 纤维桩长度 抗折强度 折裂模式 

分 类 号：R[医药卫生]