A Comparative Study of the Efficiency of FlexMaster ® NiTi Rotary and K-Flexofile ® Stainless Steel Hand Instruments

Shahin Hossain, Koukichi Matsumoto, J. Kinoshita, Y. Kimura, Shamsul Alam, Yukiko Takamatsu
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Abstract

The aims of this study were to compare the effectiveness of FlexMaster® nickeltitanium rotary and K-Flexofile® hand instruments with regard to straightening of curved root canals and preparation time, and to evaluate the morphological aspects of instrumented root canal walls in extracted human teeth. A total of 60 root canals in molar teeth, with curvatures ranging between 0 and 35°, were divided into three groups of 20 root canals each, based on the degree of curvature. Half of each group was prepared using FlexMaster® instruments by a crown-down preparation technique and the other half using K-Flexofile® by a conventional technique. After each instrumentation, the root canals were flushed with 3 ml of 5.25% sodium hypochlorite and 3% hydrogen peroxide, alternatively, and 1 ml of 14% EDTA. Using radiographs taken before and after root canal preparation, the angles of root canal curvature of all specimens were determined. The preparation time was also recorded. All roots were bisected longitudinally and the canal walls were examined by scanning electron microscopy for morphological aspects. The use of FlexMaster® instruments resulted in significantly less straightening of root canal curvatures and a shorter preparation time compared to K-Flexofiles® (p <0.01) . They resulted in less debris, but left a thicker smear layer at the apical third of root canal than the K-Flexofile®. These results showed that rapid preparation of curved root canals with minimal canal straightening was possible using FlexMaster® instruments, and the use of FlexMaster® resulted in less debris, but a thicker smear layer than that of K-Flexofile®.
FlexMaster®NiTi旋转和K-Flexofile®不锈钢手动仪器效率的比较研究
本研究的目的是比较FlexMaster®镍钛旋转器械和K-Flexofile®手动器械在矫直弯曲根管和准备时间方面的有效性,并评估拔牙时器械根管壁的形态学方面。磨牙根管弯曲度为0 ~ 35°,共60根,根据根管弯曲度分为3组,每组20根。每组一半使用FlexMaster®仪器进行冠状准备,另一半使用K-Flexofile®进行常规技术准备。每次预备后,用3ml 5.25%次氯酸钠和3%过氧化氢或1ml 14% EDTA冲洗根管。利用根管预备前后的x线片,确定所有标本的根管曲率角度。同时记录了准备时间。所有根纵切,并通过扫描电镜检查管壁的形态学方面。与K-Flexofiles®相比,FlexMaster®器械的使用显著减少了根管弯曲的矫直,缩短了准备时间(p <0.01)。与K-Flexofile®相比,它们产生的碎片较少,但在根管根尖三分之一处留下了更厚的涂片层。这些结果表明,使用FlexMaster®器械可以快速准备弯曲的根管,同时尽可能减少根管矫直,并且使用FlexMaster®产生的碎片更少,但涂抹层比K-Flexofile®更厚。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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