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Hidden Effect of Repetitive Use on the Fracture Resistance of Rotary and Reciprocating Nickel-Titanium Files.

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Biocompatibility With Osteogenic Potential of Premixed Bioceramic Cements for Use in Apical Surgery.

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Screw-in forces during instrumentation by various file systems.

Jung-Hong Ha1, Sang Won Kwak2, Sung-Kyo Kim1

  • 1Department of Conservative Dentistry, School of Dentistry, Kyungpook National University, Daegu, Korea.

Restorative Dentistry & Endodontics
|November 17, 2016
PubMed
Summary

Nickel-Titanium (NiTi) file systems showed varying screw-in forces during root canal preparation. Reciproc and ProTaper Universal files exhibited higher forces, while M-two and ProTaper Next files demonstrated lower forces.

Keywords:
Continuous rotationGeometryNickel-titanium fileReciprocatingScrew-in force

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Area of Science:

  • Endodontics
  • Dental Materials Science

Background:

  • Nickel-Titanium (NiTi) rotary and reciprocating instruments are widely used in endodontics.
  • Understanding the forces generated during canal preparation is crucial for instrument longevity and procedural safety.

Purpose of the Study:

  • To compare the maximum screw-in forces generated by different NiTi file systems during simulated root canal preparation.

Main Methods:

  • Four NiTi file systems (Mtwo, Reciproc, ProTaper Universal, ProTaper Next) were used to prepare simulated resin canals.
  • Screw-in forces were measured using a custom experimental device.
  • Standardized preparation parameters including rotation speed and pecking motion were employed.

Main Results:

  • Reciproc and ProTaper Universal files generated significantly higher maximum screw-in forces compared to M-two and ProTaper Next files.
  • The p-value was less than 0.05, indicating statistical significance.

Conclusions:

  • Geometrical characteristics of NiTi files, rather than shaping motion or alloy composition, appear to influence screw-in forces.
  • Files with smaller cross-sectional areas and greater flexibility are recommended to minimize screw-in forces.