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KMID : 1035020190200010004
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Endodontics and Dental Rehabilitation
2019 Volume.20 No. 1 p.4 ~ p.8
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Comparison of torque generation depending on the different degrees of canal curvature
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Kwak Sang-Won
Kim Hyeon-Cheol
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Abstract
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Aim: The purpose of this study was to compare the torque generation during instrumentation procedure depending on the 4 different degree of canal curvature.
Materials and Methods: Four simulated artificial canals with 15°, 25°, 35°, and 45°curvatures in a metal block were fabricated for this study. 40 ProTaper Gold F2 was freely rotated in each artificial canal with 4 mm up-and-down pecking motion at the working length (n = 10). During the instrumentation procedures torque data were recorded in real time. The total torque was calculated by integrating the area below the plot during 15 pecking movement and the maximum torque were measured. The data were statistically analyzed by using Kruskal-Wallis test and Mann-Whitney U test at a significance level of 95% (P < .05).
Results: The total and maximum torque were significantly lowest at the degree of 15 canal curvature, followed by degree of 25, 35, and 45 (P < .05). As the degree of canal curvature was increased, the generated torque was increased.
Conclusions: Under the limitations of this study, the generated torque was affected by the degree of canal curvature. Therefore, the use of flexible file is recommended for the canal shaping in a severely curved canal to reduce the chance of file fracture or development of dentinal microcrack.
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KEYWORD
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torque generation, canal curvature, NiTi file, ProTaper Gold
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