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Related Experiment Videos

A method to assess rotary nickel-titanium files.

T A Svec1, J M Powers

  • 1Department of Stomatology, Division of Endodontics, University of Texas-Houston Health Science Center, Dental Branch, 6516 John Freeman Avenue, Division of Endodontics, Room 202, Houston, TX 77030-3402, USA.

Journal of Endodontics
|February 24, 2001
PubMed
Summary

This study evaluated the durability of rotary nickel-titanium endodontic files. Larger file sizes exhibited increased torsional resistance, and used files showed greater torsional strength than new ones.

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Area of Science:

  • Endodontics
  • Materials Science
  • Biomedical Engineering

Background:

  • Rotary nickel-titanium (NiTi) files are crucial in endodontic procedures.
  • Assessing the physical properties and durability of NiTi files is essential for clinical safety and efficacy.
  • Existing methods for evaluating NiTi file performance may lack controlled parameters.

Purpose of the Study:

  • To propose and validate a controlled method for assessing the physical properties and durability of rotary NiTi files.
  • To determine the torsional moment and angular deflection at failure for NiTi files of varying sizes and usage history.

Main Methods:

  • Rotary NiTi files (0.04 taper, 25 mm length, ISO sizes 25, 30, 35) were used four times in simulated curved canals within plastic blocks.
  • A testing device controlled penetration depth (17 mm), load (8 N), and rate (120 mm/min) at 200 rpm.

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  • Torsional moment and angular deflection at failure were measured using a Torsiometer/Memocouple; data (n=5) were analyzed using ANOVA and Tukey-Kramer intervals.

    • Main Results:

    • Torsional moment significantly increased with larger file sizes (ISO 25, 30, 35).
    • Used NiTi files demonstrated significantly higher torsional moments compared to unused controls.
    • Angular deflection at failure ranged from 480 to 810 degrees across the tested instruments.

    Conclusions:

    • The proposed testing method provides a controlled environment for evaluating NiTi file durability.
    • File size is a significant factor influencing torsional resistance in NiTi rotary instruments.
    • Prior use of NiTi files appears to enhance their torsional resistance, contrary to expectations.