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WaveOne Rotary Instruments after Clinical Use.

Ya Shen1, Jeffrey M Coil2, Anthony John Mo2

  • 1Division of Endodontics, Department of Oral Biological and Medical Sciences, Faculty of Dentistry, The University of British Columbia, Vancouver, Canada; Department of Materials Engineering, Faculty of Applied Science, The University of British Columbia, Vancouver, Canada.

Journal of Endodontics
|December 15, 2015
PubMed
Summary

WaveOne endodontic files showed a low fracture risk with single use. The Small file size experienced the most distortion and unwinding, but operator skill did not influence defect rates.

Keywords:
Clinical useWaveOnefracturenickel-titanium instrumentoperatorshear failure

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Area of Science:

  • Endodontics
  • Dental Materials Science
  • Biomaterials Engineering

Background:

  • WaveOne instruments are widely used in endodontic treatments.
  • Understanding instrument defect rates is crucial for clinical safety and efficiency.
  • Previous research has not extensively detailed WaveOne defect modes after single clinical use.

Purpose of the Study:

  • To determine the incidence and types of defects in WaveOne instruments after single use.
  • To compare defect rates across different WaveOne file sizes.
  • To investigate potential influencing factors on instrument defects.

Main Methods:

  • Collected 438 WaveOne instruments after single clinical use from multiple endodontic clinics and a graduate program.
  • Analyzed the incidence and types of instrument defects.
  • Utilized scanning electron microscopy (SEM) for detailed examination of defective and fractured instruments.
  • Performed nanoindentation tests on unused and used files to assess material properties.

Main Results:

  • A total of 9.6% of WaveOne instruments exhibited defects, with 9.1% showing distortion and 0.5% fracturing.
  • The Small file size had the highest defect frequency (21.2% distortion, 0.7% fracture), followed by the Primary file (4.4% distortion, 0.4% fracture).
  • No defects were observed in the Large file size. Fractures were attributed to shear stress, and unwinding occurred near the tip. Nanohardness remained consistent between unused and used instruments.

Conclusions:

  • Single use of WaveOne files by endodontists and residents presents a very low risk of fracture.
  • The Small WaveOne file is most susceptible to distortion and unwinding.
  • Instrument defect occurrence was not significantly influenced by the operator or clinic.