Restorative Dentistry & Endodontics

Research Article

Buckling resistance, bending stiffness, and torsional resistance of various instruments for canal exploration and glide path preparation: Sang-Won Kwak, Jung-Hong Ha, WooCheol Lee, Sung-Kyo Kim, Hyeon-Cheol Kim; Restor Dent Endod 2014;39(4):270-275. Published online July 16, 2014; DOI: https://doi.org/10.5395/rde.2014.39.4.270

Objectives

This study compared the mechanical properties of various instruments for canal exploration and glide-path preparations.

Materials and Methods

The buckling resistance, bending stiffness, ultimate torsional strength, and fracture angle under torsional load were compared for C+ file (CP, Dentsply Maillefer), M access K-file (MA, Dentsply Maillefer), Mani K-file (MN, Mani), and NiTiFlex K-file (NT, Dentsply Maillefer). The files of ISO size #15 and a shaft length of 25 mm were selected. For measuring buckling resistance (n = 10), the files were loaded in the axial direction of the shaft, and the maximum load was measured during the files' deflection. The files (n = 10) were fixed at 3-mm from the tip and then bent 45° with respect to their long axis, while the bending force was recorded by a load cell. For measuring the torsional properties, the files (n = 10) were also fixed at 3-mm, and clockwise rotations (2-rpm) were applied to the files in a straight state. The torsional load and the distortion angle were recorded until the files succumbed to the torque.

Results

The CP was shown to require the highest load to buckle and bend the files, and the NT showed the least. While MA and MN showed similar buckling resistances, MN showed higher bending stiffness than MA. The NT had the lowest bending stiffness and ultimate torsional strength (p < 0.05).

Conclusions

The tested instruments showed different mechanical properties depending on the evaluated parameters. CP and NT files were revealed to be the stiffest and the most flexible instruments, respectively.

Citations

Citations to this article as recorded by

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Comparison of torsional, bending, and buckling resistances of different nickel-titanium glide path files
Feyyaz Çeliker, İrem Çetinkaya
Matéria (Rio de Janeiro).2024;[Epub] CrossRef
Comparative Analysis of Endodontic 0.15 Stainless-Steel K-Files: Exploring Design, Composition, and Mechanical Performance
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Dentistry Journal.2024; 12(2): 29. CrossRef
Comparative Analysis of Endodontic ISO Size 06, 08, and 10 Stainless Steel K-Files Used for Glide Path Procedures
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Dentistry Journal.2024; 12(4): 98. CrossRef
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Journal of Endodontics.2020; 46(8): 1125. CrossRef
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Bernardo Corrêa de ALMEIDA, Carlos Nelson ELIAS
RGO - Revista Gaúcha de Odontologia.2020;[Epub] CrossRef
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Journal of Endodontics.2020; 46(6): 707. CrossRef
Comparative evaluation of buckling resistance of Proglider and One-G file: An in vitro study
Priyanka Himmatrao Patil, Meenal Nitin Gulve, Swapnil Janardan Kolhe
Endodontology.2018; 30(1): 21. CrossRef
Mechanical Properties of Various Heat-treated Nickel-titanium Rotary Instruments
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Journal of Endodontics.2017; 43(11): 1872. CrossRef
Debris extrusion by glide-path establishing endodontic instruments with different geometries
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Journal of Dental Sciences.2016; 11(2): 136. CrossRef

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Original Article

Stress distribution of three NiTi rotary files under bending and torsional conditions using 3-dimensional finite element analysis: Tae-Oh Kim, Chan-Joo Lee, Byung-Min Kim, Jeong-Kil Park, Bock Hur, Hyeon-Cheol Kim; J Korean Acad Conserv Dent 2008;33(4):323-331. Published online July 31, 2008; DOI: https://doi.org/10.5395/JKACD.2008.33.4.323

Abstract PDF PubReader ePub

Flexibility and fracture properties determine the performance of NiTi rotary instruments. The purpose of this study was to evaluate how geometrical differences between three NiTi instruments affect the deformation and stress distributions under bending and torsional conditions using finite element analysis.

Three NiTi files (ProFile .06 / #30, F3 of ProTaper and ProTaper Universal) were scanned using a Micro-CT. The obtained structural geometries were meshed with linear, eight-noded hexahedral elements. The mechanical behavior (deformation and von Mises equivalent stress) of the three endodontic instruments were analyzed under four bending and rotational conditions using ABAQUS finite element analysis software. The nonlinear mechanical behavior of the NiTi was taken into account.

The U-shaped cross sectional geometry of ProFile showed the highest flexibility of the three file models. The ProTaper, which has a convex triangular cross-section, was the most stiff file model. For the same deflection, the ProTaper required more force to reach the same deflection as the other models, and needed more torque than other models for the same amount of rotation. The highest von Mises stress value was found at the groove area in the cross-section of the ProTaper Universal.

Under torsion, all files showed highest stresses at their groove area. The ProFile showed highest von Mises stress value under the same torsional moment while the ProTaper Universal showed the highest value under same rotational angle.

Citations

Citations to this article as recorded by

Effect of internal stress on cyclic fatigue failure in .06 taper ProFile
Hye-Rim Jung, Jin-Woo Kim, Kyung-Mo Cho, Se-Hee Park
Restorative Dentistry & Endodontics.2012; 37(2): 79. CrossRef

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