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Related Experiment Videos

Morphometric video analysis of the engine-driven nickel-titanium Lightspeed instrument system

E S Marsicovetere1, D J Clement, C E del Rio

  • 1Department of Endodontics, University of Texas Health Science Center, San Antonio 78284-7892, USA.

Journal of Endodontics
|May 1, 1996
PubMed
Summary

New Lightspeed endodontic instruments, made of nickel-titanium, showed design variations. Current American Dental Association (ADA) standards are insufficient for evaluating these novel dental files.

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Area of Science:

  • Endodontics
  • Materials Science
  • Dental Instrument Design

Background:

  • Lightspeed instruments represent a new generation of nickel-titanium endodontic files.
  • Existing evaluation standards may not be suitable for these advanced instruments.

Purpose of the Study:

  • To microscopically and morphometrically evaluate 216 Lightspeed instruments.
  • To assess physical design consistency and dimensional accuracy against established standards.

Main Methods:

  • Microscopic examination for corrosion, debris, and defects.
  • Morphometric analysis of pilot tips, heads, and shafts (8 parameters).
  • Comparison with American Dental Association (ADA) Specification No. 28 tolerances.

Main Results:

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  • No corrosion observed; surface porosities (23) and alloy defects (17) were found.
  • Only 7 of 18 sizes met ADA head diameter tolerances (+/- 0.02 mm).
  • Instruments showed gradual shifts in size and shape with increasing dimensions, not just diameter.

Conclusions:

  • Lightspeed instruments exhibit morphometric variations not fully captured by current ADA standards.
  • The unique design characteristics necessitate a re-evaluation of existing testing protocols.
  • Current American National Standards Institute/ADA Specification No. 28 is inadequate for Lightspeed nickel-titanium files.