2 种方法根管充填后牙根疲劳强度的体外研究

doi:10.3969/j.issn.1673-5749.2009.05.009

摘要/Abstract

摘要： 目的测试自行设计的疲劳测试系统的性能并比较冷牙胶侧压充填和热牙胶垂直充填对牙根疲劳强度的影响。方法 20 个离体下颌前磨牙常规开髓，根管预备后随机平均分为2 组：A 组为冷牙胶侧压充填，B 组为热牙胶垂直充填。充填后沿釉牙骨质界截去牙冠，制作成试件，用自行设计组装的疲劳测试系统在压力为50 N、频率为2 Hz 的条件下循环加载直至折裂，记录加载次数，并对所得结果进行t 检验。结果冷牙胶侧压充填组平均加载次数为16 402.00±4 632.57 次，热牙胶垂直加压组为16 500.00±4 558.37 次，t 检验显示二者差别无统计学意义（t=0.96，P＞0.05）。结论自行设计组装的疲劳测试系统可以用于模拟咬合运动。冷牙胶侧压充填和热牙胶垂直充填后牙根在疲劳强度方面未见差别。

关键词: 牙根纵裂, 疲劳强度, 根管治疗术

Abstract: Objective To measure the fatigue test system designed by ourselves, and evaluate the fatigue strength of root filled by cold lateral condensation and warm vertical condensation. Methods 20 lower premolars were made by access cavity and root canal preparation, and then divided into 2 groups randomly. Group A was cold lateral condensation, and group B was warm vertical condensation. After condensation the teeth were cut down the crown along the cemento-enamel junction. Specimens were subsequently submitted to an axial compression cycle test with 50 N, 2 Hz in fatigue test system, until fractured. The cycle time was recorded. Total values were analysis by t-test. Results The average load frequency of cold lateral condensation was 16 402.00±4 632.57, and warm vertical condensation was 16 500.00±4 558.37. The results from t-test revealed that there was no difference between two groups（t=0.96, P＞0.05）. Conclusion The fatigue test system designed by ourselves
could imitate the bite cycle. And it could be concluded that the fatigue resistance between cold lateral condensation and warm vertical condensation had no difference.

Key words: vertical root fracture, fatigue strength, root canal therapy

葛兵, 倪海林, 黄娟, 吴友农. 2 种方法根管充填后牙根疲劳强度的体外研究[J]. 国际口腔医学杂志, 2009, 36(5): 527-530.

GE Bing, NI Hai -lin, HUANG Juan , WU You-nong. Fatigue strength of root filled by two different techniques: An in vitro study

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