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Open AccessArticle

Comparison of Screw-In Forces during Movement of Endodontic Files with Different Geometries, Alloys, and Kinetics

1
Department of Conservative Dentistry, School of Dentistry, Kyungpook National University, Daegu 41940, Korea
2
Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Pusan National University, Yangsan 50612, Korea
3
Dongnam Regional Division, Korea Institute of Industrial Technology, Jinju 52845, Korea
*
Author to whom correspondence should be addressed.
Materials 2019, 12(9), 1506; https://doi.org/10.3390/ma12091506
Received: 6 April 2019 / Revised: 30 April 2019 / Accepted: 5 May 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Contemporary Endodontic Materials)
This study compared the maximum screw-in forces of various instruments during their movements. Forty simulated canals in resin blocks were randomly divided into four groups (n = 10): ProTaper Universal F2, ProTaper Gold F2, WaveOne Primary, and WaveOne Gold Primary. To standardize a lumen size, all artificial canals were prepared with ProTaper Universal F1. The rotation speed was set at 350 rpm with an automated 4 mm pecking motion at a speed of 1 mm/s. The pecking depth was increased by 1 mm for each pecking motion until the file reached the working length. During instrumentation, screw-in forces were automatically recorded by customized software. Maximum screw-in forces were analyzed by one-way ANOVA and Tukey’s post hoc comparison with the significance level at 0.05. WaveOne Gold files generated the lowest maximum screw-in forces, followed by ProTaper Gold, WaveOne, and ProTaper Universal (p < 0.05). Under the condition of this study, heat-treated nickel–titanium (NiTi) files with smaller cross-sectional area, fewer contact points, and reciprocating movements resulted in a lower screw-in effect. View Full-Text
Keywords: endodontics; engine-driven NiTi file; root canal preparation; root canal therapy; screw-in force endodontics; engine-driven NiTi file; root canal preparation; root canal therapy; screw-in force
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MDPI and ACS Style

Kwak, S.W.; Lee, C.-J.; Kim, S.K.; Kim, H.-C.; Ha, J.-H. Comparison of Screw-In Forces during Movement of Endodontic Files with Different Geometries, Alloys, and Kinetics. Materials 2019, 12, 1506.

AMA Style

Kwak SW, Lee C-J, Kim SK, Kim H-C, Ha J-H. Comparison of Screw-In Forces during Movement of Endodontic Files with Different Geometries, Alloys, and Kinetics. Materials. 2019; 12(9):1506.

Chicago/Turabian Style

Kwak, Sang W.; Lee, Chan-Joo; Kim, Sung K.; Kim, Hyeon-Cheol; Ha, Jung-Hong. 2019. "Comparison of Screw-In Forces during Movement of Endodontic Files with Different Geometries, Alloys, and Kinetics" Materials 12, no. 9: 1506.

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