Junaid Alanna, Freire Laila Gonzales, da Silveira Bueno Carlos Eduardo, Mello Isabel, Cunha Rodrigo Sanches
University of Manitoba, Winnipeg, Manitoba, Canada.
University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil.
J Endod. 2014 May;40(5):717-20. doi: 10.1016/j.joen.2013.09.021. Epub 2013 Oct 27.
More information regarding the ability of single files to maintain the original canal position is required before adopting a single-file approach to cleaning and shaping. This study compares apical transportation in curved root canals when instrumenting with a single WaveOne (WO) file (Dentsply Tulsa Dental Specialties, Tulsa, OK) in a reciprocating motion with that incurred when using a sequence of Twisted Files (TFs; SybronEndo, Orange, CA) in a continuous rotating motion.
Forty mesial canals of mandibular molars were evenly allocated into 2 balanced groups (n = 20) with a 17-mm average canal length and 20° average curvature. Canals were accessed in a conventional manner and instrumentation was completed with a single WO file or a series of TFs. The canals were instrumented according to the manufacturers' protocol. Apical transportation was assessed on a comparison of the pre- and postinstrumentation micro-computed tomographic scans at 1-, 2-, 3-, 4-, and 5-mm sections. One-way analysis of variance was performed to assess if a significant difference between systems exists.
No significant difference (P > .05) was found between the WO and TF groups. Transportation in the mesial direction was of greater magnitude than distal transportation for both files systems. The mean transportation in the mesial direction was 100.1 ± 8.8 μm (WO group) and 101.0 ± 10.9 μm (TF group) (P = .5), whereas distal transportation was found to be 80.9 ± 14.6 μm (WO group) and 60.3 ± 11.0 μm (TF group) (P = .3).
The results suggest that no difference exists between the WO file system and the conventional multifile TF system when considering apical transportation in curved canals.
在采用单根管锉法进行根管清理和塑形之前，需要更多关于单根管锉维持原始根管位置能力的信息。本研究比较了在弯曲根管中使用单根WaveOne（WO）锉（登士柏图尔萨牙科专业公司，图尔萨，俄克拉荷马州）进行往复运动预备时与使用一系列Twisted Files（TFs；SybronEndo公司，奥兰治，加利福尼亚州）进行连续旋转运动预备时根尖移位的情况。
将40颗下颌磨牙的近中根管平均分为2个平衡组（n = 20），平均根管长度为17 mm，平均弯曲度为20°。以传统方式开髓，并用单根WO锉或一系列TFs完成根管预备。根管预备按照制造商的方案进行。通过比较预备前后在1、2、3、4和5 mm截面的显微计算机断层扫描来评估根尖移位情况。进行单因素方差分析以评估两种系统之间是否存在显著差异。
WO组和TF组之间未发现显著差异（P > 0.05）。对于两种锉系统，近中方向的移位幅度均大于远中方向。近中方向的平均移位在WO组为100.1±8.8μm，在TF组为101.0±10.9μm（P = 0.5）；而远中方向的移位在WO组为80.9±14.6μm，在TF组为60.3±11.0μm（P = 0.3）。
结果表明，在考虑弯曲根管的根尖移位时，WO锉系统与传统的多根管锉TF系统之间没有差异。
