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Related Experiment Videos

Scanning electron microscope appearances of Lightspeed instruments used clinically: a pilot study

M Marending1, F Lutz, F Barbakow

  • 1Department of Preventive Dentistry, School of Dentistry, University of Zurich, Switzerland.

International Endodontic Journal
|November 21, 1998
PubMed
Summary

Overusing Lightspeed dental instruments can lead to microfractures in cutting heads. Clinicians should monitor instrument condition to prevent potential damage during root canal treatments.

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Area of Science:

  • Endodontics
  • Dental Materials Science

Background:

  • Lightspeed instruments are widely used in endodontic procedures.
  • Assessing the wear and tear of dental instruments is crucial for patient safety and treatment efficacy.

Purpose of the Study:

  • To evaluate the effects of clinical use on the cutting heads of Lightspeed endodontic instruments.
  • To identify potential failure modes and recommend optimal usage guidelines.

Main Methods:

  • Scanning electron microscopy (SEM) was used to examine 108 Lightspeed instrument cutting heads.
  • Instruments were sourced from two distinct clinical settings with varying usage patterns.
  • Defects such as debris, metal strips, disrupted edges, microfractures, tears, pitting, fretting, and fatigue cracks were assessed.

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Main Results:

  • Ultrasonic cleaning reduced debris presence before SEM examination.
  • Microfractures and tears were more common in instruments used more frequently (faculty group).
  • Pitting and fretting were equally prevalent in both groups; no fatigue cracks were observed.

Conclusions:

  • Frequent use of Lightspeed instruments may increase the risk of microfractures in the cutting head flutes.
  • Clinicians should be aware of potential instrument degradation with prolonged use.
  • Adherence to recommended usage or replacement protocols is advised to maintain instrument integrity.