Crack Initiation on the Apical Root Surface Caused by Three Different Nickel-Titanium Rotary Files at Different Working Lengths
Crack Initiation on the Apical Root Surface Caused by Three Different Nickel-Titanium Rotary Files at Different Working Lengths
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DOI：
10.1016/j.joen.2010.12.002
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发表时间：
2011-04-01
影响因子：
4.2
通讯作者：
Suda, Hideaki
中科院分区：
文献类型：
--
作者：
Adorno, Carlos G.;Yoshioka, Takatomo;Suda, Hideaki
简介：本研究的目的是比较三种品牌的镍钛（NiTi）旋转锉在短距离、在根尖孔处和在根尖孔之外工作时，不同设计对根尖裂缝发生的影响。研究方法：选择108颗直形单根管的牙齿，将其固定在模拟牙周韧带的树脂块上，暴露根尖。根据使用的NiTi旋转锉类型（Profile [Dentsply Maillefer，Ballaigues，Switzerland]、K3 [SybronEndo，West柯林斯，CA]和Endo Wave [FKG Dentaire，La-Chaux-de-Fonds，Switzerland]）和工作长度（CL处，距根尖孔[CL - 1 mm]短1 mm，距根尖孔[CL + 1 mm]外1 mm），将牙齿分为9组，每组12颗牙齿。在每次换锉时，在根尖扩大序列中拍摄每颗牙齿根尖表面的数字图像。将这些图像与基线图像进行比较，并注意到裂纹的存在。结果：CL - 1 mm组中观察到的裂纹明显少于CL和CL + 1 mm组。使用的文件类型之间没有显着差异。结论：在根尖孔前1 mm处工作，根尖表面裂纹较少。此外，当使用较大的文件大小时，观察到更多的裂缝。使用NiTi旋转锉进行内固定可能会导致根尖牙根表面出现裂纹。（J Endod 2011;37：522-525）
Introduction: The aim of this study was to compare the effects of three brands of nickel-titanium (NiTi) rotary files with different designs on the initiation of apical root cracks when working short, at, and beyond the apical foramen. Methods: One-hundred eight teeth with straight single canals were selected and mounted on resin blocks with simulated periodontal ligaments, and the apex was exposed. The teeth were divided into 9 groups of 12 teeth according to the NiTi rotary file type used (Profile [Dentsply Maillefer, Ballaigues, Switzerland], K3 [SybronEndo, West Collins, CA], and Endo Wave [FKG Dentaire, La-Chaux-de-Fonds, Switzerland]) and working length (at CL, 1 mm short of [CL - 1 mm], and 1 mm beyond [CL + 1 mm] the apical foramen). Digital images of the apical surface of every tooth were taken during the apical enlargement sequence at each file change. These images were compared with the baseline image, and the presence of a crack was noted. Results: Significantly less cracks were observed in the CL - 1 mm group than in the CL and CL + 1 mm groups. No significant difference was found between the file types used. Conclusions: Working 1 mm short of the apical foramen caused less cracks on the apical surface. In addition, more cracks were observed when using larger file sizes. Instrumentation with NiTi rotary files could potentially cause cracks on the apical root surface. (J Endod 2011;37:522-525)