Restorative Dentistry and Endodontics

  • 제41권4호
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  • Pages.304-309
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  • 2016
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  • 2234-7658(pISSN)
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  • 2234-7666(eISSN)
대한치과보존학회 (The Korean Academy of Conservative Dentistry)
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Screw-in forces during instrumentation by various file systems

  • Ha, Jung-Hong (Department of Conservative Dentistry, School of Dentistry, Kyungpook National University) ;
  • Kwak, Sang Won (Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Pusan National University) ;
  • Kim, Sung-Kyo (Department of Conservative Dentistry, School of Dentistry, Kyungpook National University) ;
  • Kim, Hyeon-Cheol (Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Pusan National University)
  • 투고 : 2016.08.30
  • 심사 : 2016.09.20
  • 발행 : 2016.11.30
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초록

Objectives: The purpose of this study was to compare the maximum screw-in forces generated during the movement of various Nickel-Titanium (NiTi) file systems. Materials and Methods: Forty simulated canals in resin blocks were randomly divided into 4 groups for the following instruments: Mtwo size 25/0.07 (MTW, VDW GmbH), Reciproc R25 (RPR, VDW GmbH), ProTaper Universal F2 (PTU, Dentsply Maillefer), and ProTaper Next X2 (PTN, Dentsply Maillefer, n = 10). All the artificial canals were prepared to obtain a standardized lumen by using ProTaper Universal F1. Screw-in forces were measured using a custom-made experimental device (AEndoS-k, DMJ system) during instrumentation with each NiTi file system using the designated movement. The rotation speed was set at 350 rpm with an automatic 4 mm pecking motion at a speed of 1 mm/sec. The pecking depth was increased by 1 mm for each pecking motion until the file reach the working length. Forces were recorded during file movement, and the maximum force was extracted from the data. Maximum screw-in forces were analyzed by one-way ANOVA and Tukey's post hoc comparison at a significance level of 95%. Results: Reciproc and ProTaper Universal files generated the highest maximum screw-in forces among all the instruments while M-two and ProTaper Next showed the lowest (p < 0.05). Conclusions: Geometrical differences rather than shaping motion and alloys may affect the screw-in force during canal instrumentation. To reduce screw-in forces, the use of NiTi files with smaller cross-sectional area for higher flexibility is recommended.

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참고문헌

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피인용 문헌

  1. Nickel–titanium instruments in endodontics: a concise review of the state of the art vol.32, pp.suppl 1, 2018, https://doi.org/10.1590/1807-3107bor-2018.vol32.0067
  2. How biomechanics can affect the endodontic treated teeth and their restorative procedures? vol.32, pp.suppl 1, 2018, https://doi.org/10.1590/1807-3107bor-2018.vol32.0076
  3. Evaluation of selected mechanical properties of NiTi rotary glide path files manufactured from controlled memory wires vol.37, pp.4, 2018, https://doi.org/10.4012/dmj.2017-276
  4. Mechanical Properties of Orifice Preflaring Nickel-titanium Rotary Instrument Heat Treated Using T-Wire Technology vol.44, pp.12, 2016, https://doi.org/10.1016/j.joen.2018.08.016
  5. Comparison of Screw-In Forces during Movement of Endodontic Files with Different Geometries, Alloys, and Kinetics vol.12, pp.9, 2016, https://doi.org/10.3390/ma12091506
  6. Assessment of mechanical properties of WaveOne Gold Primary reciprocating instruments vol.38, pp.3, 2016, https://doi.org/10.4012/dmj.2018-203
  7. Ex-Vivo Comparison of Torsional Stress on Nickel–Titanium Instruments Activated by Continuous Rotation or Adaptive Motion vol.13, pp.8, 2020, https://doi.org/10.3390/ma13081900
  8. Enhanced root canal-centering ability and reduced screw-in force generation of reciprocating nickel-titanium instruments with a post-machining thermal treatment vol.39, pp.2, 2016, https://doi.org/10.4012/dmj.2018-428
  9. Comparative analysis of torque and apical force to assess the cutting behaviour of ProTaper Next and ProTaper Universal endodontic instruments vol.46, pp.1, 2020, https://doi.org/10.1111/aej.12351
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