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2 "Buckling resistance"
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Buckling resistance, torque, and force generation during retreatment with D-RaCe, HyFlex Remover, and Mtwo retreatment files
Yoojin Kim, Seok Woo Chang, Soram Oh
Restor Dent Endod 2023;48(1):e10.   Published online February 6, 2023
DOI: https://doi.org/10.5395/rde.2023.48.e10
AbstractAbstract PDFPubReaderePub
Objectives

This study compared the buckling resistance of 3 nickel-titanium (NiTi) retreatment file systems and the torque/force generated during retreatment.

Materials and Methods

The buckling resistance was compared among the D-RaCe (DR2), HyFlex Remover, and Mtwo R25/05 retreatment systems. J-shaped canals within resin blocks were prepared with ProTaper NEXT X3 and obturated by the single-cone technique with AH Plus. After 4 weeks, 4 mm of gutta-percha in the coronal aspect was removed with Gates-Glidden drills. Retreatment was then performed using DR1 (size 30, 10% taper) followed by DR2 (size 25, 4% taper), HyFlex Remover (size 30, 7% taper), or Mtrwo R25/05 (size 25, 5% taper) (15 specimens in each group). Further apical preparation was performed with WaveOne Gold Primary. The clockwise torque and upward force generated during retreatment were recorded. After retreatment, resin blocks were examined using stereomicroscopy, and the percentage of residual filling material in the canal area was calculated. Data were analyzed using 1-way analysis of variance with the Tukey test.

Results

The HyFlex Remover files exhibited the greatest buckling resistance (p < 0.05), followed by the Mtwo R25/05. The HyFlex Remover and Mtwo R25/05 files generated the highest maximum clockwise torque and upward force, respectively (p < 0.05). The DR1 and DR2 files generated the least upward force and torque (p < 0.05). The percentage of residual filling material after retreatment was not significantly different between file systems (p > 0.05).

Conclusions

NiTi retreatment instruments with higher buckling resistance generated greater clockwise torque and upward force.

Citations

Citations to this article as recorded by  
  • Comparative evaluation of the efficacy of three different retreatment files in removing root canal filling material: An In vitro confocal microscopy study
    Meghna Sarah Abraham, Aravind R. Kudva, Prathap M. S. Nair, Shravan Kini, Samreena Kalander, Faseeh Muhammed Bin Farookh
    Endodontology.2025; 37(2): 136.     CrossRef
  • Cone-beam computed tomographic evaluation and fracture resistance of endodontically retreated teeth using hyflex remover, Mtwo, and ProTaper retreatment file systems: An in vitro study
    Isha Singh, Dakshita Joy Sinha, Pallavi Sharma, Kunal Bedi, Priyanka Rani, Swapnil Vats
    Saudi Endodontic Journal.2024; 14(1): 56.     CrossRef
  • 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
  • Assessing the impact of obturation techniques, kinematics and irrigation protocols on apical debris extrusion and time required in endodontic retreatment
    Eugenio Pedullà, Francesco Iacono, Martina Pitrolo, Giovanni Barbagallo, Giusy Rita Maria La Rosa, Chiara Pirani
    Australian Endodontic Journal.2023; 49(3): 623.     CrossRef
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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
AbstractAbstract PDFPubReaderePub
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  
  • Buckling resistance of various pathfinding endodontic instruments: An in vitro study
    Ujjwal Das, Rajesh Kumar Das, Kallol Kumar Saha, Lugu Buru Murmu, Srimanta Banerjee, Rishila Nag
    Journal of Conservative Dentistry and Endodontics.2025; 28(4): 384.     CrossRef
  • 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
    Abayomi Omokeji Baruwa, Filipa Chasqueira, Sofia Arantes-Oliveira, João Caramês, Duarte Marques, Jaime Portugal, Jorge N. R. Martins
    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
    Abayomi Omokeji Baruwa, Filipa Chasqueira, Sofia Arantes-Oliveira, João Caramês, Duarte Marques, Jaime Portugal, Jorge N. R. Martins
    Dentistry Journal.2024; 12(4): 98.     CrossRef
  • Glide Path in Endodontics: A Literature Review of Current Knowledge
    Vlad Mircea Lup, Giulia Malvicini, Carlo Gaeta, Simone Grandini, Gabriela Ciavoi
    Dentistry Journal.2024; 12(8): 257.     CrossRef
  • Shaping Ability and Buckling Resistance of TruNatomy, WaveOne gold, and XP-Endo Shaper Single-File Systems
    Neveen Ali Shaheen, Nahla Gamal Eldin Elhelbawy
    Contemporary Clinical Dentistry.2022; 13(3): 261.     CrossRef
  • A comparison of different hand and rotary endodontic glide path files for buckling resistance
    Ruchika Gupta, Pramod Mohite, Suvarna Patil, Nandita Bansal
    Endodontology.2021; 33(2): 102.     CrossRef
  • Buckling Resistance of Various Nickel-Titanium Glide Path Preparation Instruments in Dynamic or Static Mode
    Jung-Hong Ha, Sang Won Kwak, Antheunis Versluis, Hyeon-Cheol Kim
    Journal of Endodontics.2020; 46(8): 1125.     CrossRef
  • Influence of heat treatment on color and flexibility of nickel-titanium endodontic instruments
    Bernardo Corrêa de ALMEIDA, Carlos Nelson ELIAS
    RGO - Revista Gaúcha de Odontologia.2020;[Epub]     CrossRef
  • Influence of Negotiation, Glide Path, and Preflaring Procedures on Root Canal Shaping—Terminology, Basic Concepts, and a Systematic Review
    Gianluca Plotino, Venkateshbabu Nagendrababu, Frederic Bukiet, Nicola M. Grande, Sajesh K. Veettil, Gustavo De-Deus, Hany Mohamed Aly Ahmed
    Journal of Endodontics.2020; 46(6): 707.     CrossRef
  • Mechanical Properties of Various Heat-treated Nickel-titanium Rotary Instruments
    Hye-Jin Goo, Sang Won Kwak, Jung-Hong Ha, Eugenio Pedullà, Hyeon-Cheol Kim
    Journal of Endodontics.2017; 43(11): 1872.     CrossRef
  • Debris extrusion by glide-path establishing endodontic instruments with different geometries
    Jung-Hong Ha, Sung Kyo Kim, Sang Won Kwak, Rashid El Abed, Yong Chul Bae, Hyeon-Cheol Kim
    Journal of Dental Sciences.2016; 11(2): 136.     CrossRef
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  • 21 Download
  • 12 Crossref
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