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Related Experiment Videos

Canal markings produced by endosonic instruments.

A D Walmsley1, C Murgel, K V Krell

  • 1Department of Endodontics, University of Iowa College of Dentistry.

Endodontics & Dental Traumatology
|April 1, 1991
PubMed
Summary

Ultrasonic and sonic endodontic files create distinct canal surface patterns. Ultrasonic K-files imprint cutting edges, while sonic files show longitudinal and transverse motion marks, with unclear long-term effects.

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Area of Science:

  • Endodontics
  • Dental Materials Science
  • Biomaterials

Background:

  • Endodontic instrumentation aims to clean and shape root canals.
  • The surface characteristics left by endodontic files are crucial for effective therapy.
  • Previous research noted diagonal patterns from ultrasonic files, but causation and sonic file markings were unclear.

Purpose of the Study:

  • To investigate and differentiate the surface markings produced by ultrasonic and sonic endodontic files in dentin.
  • To clarify the causative factors behind the observed patterns.

Main Methods:

  • In vitro study using polished dentin discs to observe initial file markings.
  • Root canals of extracted teeth were instrumented with ultrasonic K-files, Rispisonic, and Shaper files.
  • Scanning electron microscopy (SEM) was used to analyze the surface topography.

Main Results:

  • Ultrasonic K-files created diagonal grooves, imprints of cutting edges, in coronal and middle thirds, and longitudinal marks in the apical third.
  • Sonic files (Rispisonic, Shaper) produced debris bands and both longitudinal and transverse grooves.
  • Debris formation by sonic files was observed even with sodium hypochlorite (NaOCl) irrigation.

Conclusions:

  • Distinct surface patterns are generated by ultrasonic and sonic endodontic instrumentation.
  • The clinical significance and long-term impact of these differing surface characteristics on root canal therapy prognosis remain unknown.

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