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首页> 外文期刊>International medical journal: IMJ >The Comparison of ProTaper? and K-Flexofiles in Preparation of Curved Canals: In Vitro Study
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The Comparison of ProTaper? and K-Flexofiles in Preparation of Curved Canals: In Vitro Study

机译：ProTaper的比较？和K-Flexofiles在弯曲管的制备中：体外研究

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Objectives: To compare the performance of ProTaper? rotary instruments and stainless steel K-Flexofiles in preparing curved root canals in terms of changes in angle of curvature, apical transportation and production of canal aberrations and also to record the rate of separation of ProTaper? files.Materials and Methods: Forty-one human mandibular first molars (mesial roots only each with 2 canals) with canal curvature of 15 to 18 degrees were divided into two groups. Forty-one canals were prepared using ProTaper? rotary instruments while forty-one canals were prepared using K-Flexofiles and Gates-Glidden drills. Digital radiographs obtained were analyzed with various image-analyzing programs. The parameters evaluated were reduction in canal curvature, apical transportation, lateral perforation, ledge, and apical zip, elbow, over-instrumentation and instrument separation. The statistical tests used were both independent and paired t-test, general linear models repeated measures, cross-tabulation with Pearson's chi-square test and Fisher's exact test. Significance level was set at 5% (a = 0.05).Results: Significant difference (P < 0.05) was found in the mean curvature reduction and in the occurrence of elbows. Five ProTaper? files fractured during canal preparation procedures; three of them were F3, and two were F2 instruments.Conclusion: ProTaper? rotary instruments maintained the curvatures better however it performed equally in terms of apical canal transportation when compared with stainless-steel instruments. For procedural errors and canal aberrations, ProTaper? instruments produced more elbows. Incidence of fractures was enhanced with increasing size of ProTaper? files, with most fractures occurring with file size #30 (F3) and #25 (F2).
机译：目标：比较ProTaper的性能？旋转器械和不锈钢K-Flexofiles来制备弯曲的根管，包括曲率角的变化，根尖运输和根管畸变的产生，以及记录ProTaper的分离率。材料与方法：将41个人的下颌第一磨牙（仅根部有2条根管）的根管磨成15至18度的管曲度。使用ProTaper准备了41条运河？使用K-Flexofiles和Gates-Glidden钻头准备了41条运河的旋转器械。用各种图像分析程序分析获得的数字射线照片。评估的参数为：减少运河曲率，减少根尖运输，横向穿孔，壁架和根尖拉链，肘部，过度器械和器械分离。所使用的统计检验是独立的和配对的t检验，通用线性模型重复测量，与Pearson卡方检验和Fisher精确检验的交叉表。显着性水平设置为5％（a = 0.05）。结果：在平均曲率减小和肘部发生方面发现显着差异（P <0.05）。五个ProTaper？渠道准备过程中破裂的锉;其中三个是F3，两个是F2仪器。结论：ProTaper？旋转器械可更好地保持曲率，但与不锈钢器械相比，在根管运输方面表现相同。对于程序错误和运河畸变，ProTaper吗？器械产生更多的肘。 ProTaper尺寸的增加会增加骨折的发生率？锉，大多数骨折发生在＃30（F3）和＃25（F2）大小。

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