| 摘要: |
| ［摘要］ 目的 分析Hero642机用镍钛锉在临床使用时的损伤情况及原因，为其预防提供资料。方法 2007-05～2010-04收集在临床根管预备中发生变形、折断的Hero642机用镍钛锉共275根，记录损伤器械的号数和锥度，并对折断器械在患牙中的分布、根管中的位置进行分析。结果 镍钛合金根管器械折断的类型以0.02锥度锉居多(50.8%)，且易发生于磨牙、根管弯曲中段。结论 镍钛合金根管器械折断与患牙的根管状况及使用方法等因素紧密相关。 |
| 关键词: 根管预备 机用镍钛锉 器械损坏 |
| DOI：10.3969/j.issn.1674-3806.2010.09.02 |
| 分类号:R 783.1 |
| 基金项目:广西卫生厅科研课题(编号：Z2007145) |
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| Clinical analysis of the failure of Hero642 nickel-titanium rotary instruments during root canal therapy |
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LI Yan, YANG Jian-shao, LI Shi-jian
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Department of Stomatology, the People′s Hospital of Guangxi Zhuang Autonomous Region，Nanning 530021，China
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| Abstract: |
| ［Abstract］ Objective To analyze the clinical failure of nickel-titanium instruments and its causes.Methods Two hundred and seventy-five Hero642 nickel-titanium rotary instruments failed during the clinical root canal instrumentations from May 2007 to April 2010 were collected.The analysis was carried out regarding the relation between the broken files and the distribution in the teeth and canal, and the relation between these files′ size and taper.Results The majority of the clinical fracture of nickel-titanium instruments was the 0.02 taper and frequently occurred in molar and the midpoint of the curvature.Conclusion The fracture of nickel-titanium instruments is closely related to the anatomy of the root cana1 and the usage of instrument and so on. |
| Key words: Root canal preparation Nickel-titanium rotary instrument Failure of instruments |
