使用手动器械和旋转器械时去除牙本质厚度的比较。
Comparison of removed dentin thickness with hand and rotary instruments.
作者信息
Shahriari Shahriar, Abedi Hasan, Hashemi Mahdi, Jalalzadeh Seyed Mohsen
机构信息
Department of Endodontics, Dental School, Hamadan University of Medical Sciences, Hamadan, Iran.
出版信息
Iran Endod J. 2009 Spring;4(2):69-73. Epub 2009 Apr 17.
Abstract
INTRODUCTION
The aim of this study was to evaluate the amount of dentine removed after canal preparation using stainless steel (SS) hand instruments or rotary ProFile instruments.
MATERIALS AND METHODS
Thirty-six extracted human teeth with root canal curvatures less than 30º were embedded in clear polyester resin. The roots were cut horizontally at apical 2, 4 and 7 mm. Dentin thickness was measured at each section and the sections were accurately reassembled using a muffle. Root canals were randomly prepared by SS hand instruments or rotary ProFile instruments. Root sections were again separated, and the remaining dentin thickness was measured. Mann-Whitney U and t tests were performed for analytic comparison of the results.
RESULTS
The thickness of removed dentin was significantly different between the two used methods (P<0.05). Significantly greater amounts of dentin was removed mesially in all sections in hand instrumentation group (P<0.001).
CONCLUSION
ProFile rotary instrumentation prepares root canals with a greater conservation of tooth structure.
摘要
引言
本研究的目的是评估使用不锈钢（SS）手动器械或旋转ProFile器械进行根管预备后去除的牙本质量。
材料与方法
将三十六颗根管弯曲度小于30°的拔除人牙嵌入透明聚酯树脂中。在根尖2、4和7毫米处水平切断牙根。在每个切片处测量牙本质厚度，并使用马弗炉精确重新组装切片。根管随机使用SS手动器械或旋转ProFile器械进行预备。再次分离牙根切片，并测量剩余牙本质厚度。进行曼-惠特尼U检验和t检验以对结果进行分析比较。
结果
两种使用方法之间去除的牙本质厚度有显著差异（P<0.05）。手动器械组所有切片中近中方向去除的牙本质量显著更多（P<0.001）。
结论
ProFile旋转器械预备根管时能更好地保留牙齿结构。
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