Journal of Endodontics
Volume 18, Issue 7 , Pages 336-339, July 1992

Canal master files: Scanning electron microscopic evaluation of new instruments and their wear with clinical usage

  • Mario L. Zuolo, CD

      Affiliations

    • Dr. Zuolo is a professor in endodontics, Camilo Castelo Branco, School of Dentistry, University São Paulo, Brazil.
    • ,
  • Richard E. Walton, DMD, MS

      Affiliations

    • Dr. Walton is professor and chairman, Department of Endodontics, University of Iowa, College of Dentistry, Iowa City, IA.
    • Corresponding Author InformationAddress requests for reprints to Dr. Richard Walton, Department of Endodontics, University of Iowa, College of Dentistry, Iowa City, IA 52242.
    • ,
  • Carlos A.F. Murgel, CD

      Affiliations

    • Dr. Murgel is a professor in endodontics, Camilo Castelo Branco, School of Dentistry, University São Paulo, Brazil.

Canal Master instruments have a short, fluted cutting area and a small flexible shaft; they may be predisposed to rapid wear and breakage. This study examined new and used files as to tip, flute, and shaft design when new and with increasing time of canal preparation.

One hundred files prepared 140 curved canals. Sizes #20, #40, and #60 files were examined unused and after 1, 3, 5, and 7 min of use. Evaluation was for uniformity when new and for deterioration and breakage with usage.

The smaller sizes (#20 and #40) had some inconsistencies when new and were most predisposed to wear and breakage with time. Findings suggest that smaller files could have had improved quality control by the manufacturer. Also, they should be used with caution and discarded after short times of use in small, curved canals. This should minimize instrument separation and maximize cutting efficiency.

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PII: S0099-2399(06)80484-X

doi:10.1016/S0099-2399(06)80484-X

Journal of Endodontics
Volume 18, Issue 7 , Pages 336-339, July 1992

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