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首页> 外文期刊>Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontics >Shaping ability of Hero 642 rotary nickel-titanium instruments and stainless steel hand K-Flexofiles in simulated curved root canals.
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Shaping ability of Hero 642 rotary nickel-titanium instruments and stainless steel hand K-Flexofiles in simulated curved root canals.

机译：Hero 642旋转镍钛器械和不锈钢手动K型柔韧锉在模拟弯曲根管中的成形能力。

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OBJECTIVE: The purpose of this study was to compare the shaping ability of Hero 642 rotary nickel-titanium instruments with that of stainless steel hand K-Flexofiles. STUDY DESIGN: Simulated 28 degrees and 35 degrees curved canals were prepared with Hero 642 instruments by using a crown-down preparation and with K-Flexofiles by using a reaming working motion (n = 24 canals in each case). All canals were sequentially prepared up to size 35. Preinstrumental and postinstrumental images were taken, and assessment of the canal shapes was completed with a computer image analysis program. Material removal was measured at 20 measuring points, beginning 1 mm away from the apex. In addition, preparation time, changes of working length, and instrument failures were recorded. RESULTS: In comparison with stainless steel K-Flexofiles, rotary Hero 642 instruments achieved better canal geometry and showed less canal transportation, both in canals with 28 degrees curves and in canals with 35 degrees curves. Three Hero instruments separated, whereas none of the K-Flexofiles separated. In 28 degrees curved canals, Hero instruments were significantly faster (P <.01) and maintained working distance significantly better (P <.05) than K-Flexofiles. These differences were insignificant in 35 degrees curved canals. CONCLUSION: Hero 642 instruments prepared curved canals rapidly, without change in working length and with only minimal transportation toward the outer aspect of the curve.
机译：目的：本研究的目的是比较Hero 642旋转镍钛器械与不锈钢手动K型挠性锉刀的成形能力。研究设计：用Hero 642器械通过冠下准备和用K-Flexofiles通过铰孔工作运动（每种情况下n = 24条运河）来准备模拟的28度和35度弯曲的运河。依次准备所有大小不超过35号的根管。取出器械前和器械后图像，并使用计算机图像分析程序完成对根管形状的评估。在距顶点1毫米处开始的20个测量点处测量材料去除。此外，还记录了准备时间，工作时间的变化和仪器故障。结果：与不锈​​钢K-Flexofiles相比，旋转的Hero 642器械在具有28度弯曲度的运河和具有35度弯曲度的运河中，都具有更好的运河几何形状，并且运河运输较少。三个Hero乐器分开了，而K-Flexo文件没有分开。与K-Flexofiles相比，在28度弯曲的运河中，Hero器械的速度明显更快（P <.01），保持的工作距离也明显更好（P <.05）。这些差异在35度弯曲的运河中微不足道。结论：Hero 642器械可快速制备弯曲的根管，而无需改变工作长度，并且仅向弯曲的外表面进行最小的运输。

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