许宁 卜冬平 王翠妍

[摘要] 目的 评价纤维桩修复对根管治疗后年轻恒牙抗折强度的影响。 方法 选取2014年7～10月大连市口腔医院60颗因正畸需要拔除的未经根管治疗的前磨牙。按照随机数字表法将其分为三组，每组20颗。根管充填后不做处理者为阴性对照组；根管充填后进行复合树脂水门汀充填者为阳性对照组；根管充填后行纤维桩+树脂水门汀者为实验组。常规桩道预备后用复合树脂和纤维桩修复，万能测试机进行抗折实验，比较三组抗折强度。结果 实验组牙根颈部抗折强度为（978.00±86.56）N，根尖1/3处为（807.00±20.13）N，阳性对照组牙根颈部抗折强度为（786.00±23.42）N，根尖1/3处为（577.00±18.78）N，阴性对照组牙根颈部抗折强度为（401.00±12.52）N，根尖1/3处为（298.00±13.16）N，组间比较差异有统计学意义（P<0.01）。 结论 对用纤维桩修复根管治疗过的年轻恒牙各部位抗折强度的测量显示，纤维桩可以增强根管治疗后年轻恒牙的抗折强度。

[关键词] 年轻恒牙；纤维桩；抗折强度

[中图分类号] R781.05 [文献标识码] A [文章编号] 1674-4721（2016）03（b）-0120-03

[Abstract] Objective To evaluate the influence of fiber post restoration on fracture resistance in young permanent teeth after root canal treatment. Methods From July to October 2014，60 premolar teethwithout root canal treatment were pulled out for orthodontics and selected in our hospital.According to a random number table，they were evenly divided into three groups.Root canal filling without further disposal was classified into negative control group.Composite resin cement filling was used after root canal filling，which was categorized into positive control group.After root canal filling，fiber post combining with resin cement was classified into experimental group.Composite resin and fiber post were applied after conventional post space preparation.Universal testing machine was used for fracture resistance.The strength of fracture resistance among three groups was compared. Results In the experimental group，strength of fracture resistance in root neck was （978.00±86.56） N and in 1/3 of root tip was （807.00±20.13） N.In the positive control group，they were （786.00±23.42） N and （577.00±18.78） N，while in the negative control group，they were （401.00±12.52） N and （298.00±13.16） N respectively，that displayed statistical differences in comparison between groups （P<0.01）. Conclusion After testing the strength of fracture resistance in each position of young permanent teeth treated by fiber post restoration on root canal，fiber post can enhance the fracture resistance strength of young permanent teeth after root canal therapy.

[Key words] Young permanent teeth；Fiber post；Fracture resistance strength

临床上核桩冠是修复残根残冠的主要方法，纤维桩具有抗疲劳性、耐腐蚀性和生物相容性好等特点，由于其与牙本质的弹性模量相似，减少了根折的发生率，且折断后易去除，使患者就诊次数减少，在临床上正广泛地被认可和使用[1-2]。广泛应用的纤维桩使越来越多的缺损大的牙体得以保存，与此同时，如何增加年轻恒牙薄弱根管的抗力性，提高修复的成功率，也成为该领域要解决的难题。目前国内外关于纤维桩的主要研究为纤维桩的生物力学、黏结固位等[3-5]，但都集中在发育完成的恒牙，而对于年轻恒牙纤维桩修复的实验研究较少见。本实验通过对用纤维桩修复根管治疗过的年轻恒牙各部位抗折强度的测量，探讨纤维桩可以增强根管治疗后年轻恒牙的抗折强度。……