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Related Experiment Videos

Defects in GT rotary instruments after use: an SEM study.

T R Tripi1, A Bonaccorso, V Tripi

  • 1Cattedra di Odontoiatria Conservatrice, Corso di Laurea in Odontoiatria e Protesi Dentaria, Università di Catania, Italy.

Journal of Endodontics
|January 5, 2002
PubMed
Summary

Used GT Rotary instruments showed increased defects like pitting and scraping after use, differing from other instruments. No fractures occurred, but wear necessitates careful evaluation for continued use.

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Area of Science:

  • Endodontics
  • Materials Science

Background:

  • Rotary nickel-titanium instruments are crucial in endodontics.
  • Frequent replacement of these instruments due to wear is a significant concern.

Purpose of the Study:

  • To evaluate the defects present in GT Rotary instruments before and after clinical usage.
  • To compare the wear patterns of GT Rotary instruments with other available instruments.

Main Methods:

  • Laboratory evaluation of GT Rotary instruments using scanning electron microscopy (SEM) at magnifications up to 12,000x.
  • Instruments (sizes 20 and 35) were examined before and after use in 12 root canals.
  • Defects were scored based on pre- and post-usage SEM images.

Main Results:

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  • No instrument fracturing or plastic deformation was observed.
  • Significant changes in debris, pitting, and scraping were noted after usage.
  • Increased presence of defects, including pitting, scraping, and blunt cutting edges, was evident on all used instruments.

    • Conclusions:

    • Used GT Rotary instruments exhibit wear and increased surface defects.
    • The wear behavior of GT Rotary instruments appears distinct compared to other rotary instruments.
    • Further research is needed to understand the long-term implications of these defects on instrument performance and longevity.