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Quintessence Publishing: Journals: QI
Quintessence International

Edited by Eli Eliav

ISSN 0033-6572 (print) • ISSN 1936-7163 (online)

Publication:
June 1997
Volume 28 , Issue 6

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Instrument deterioration with usage: Nickel-titanium versus stainless steel

Zuolo/Walton

Pages: 397-402
PMID: 9477904

Nickel-titanium instruments purportedly resist deformation and loss of sharpness better than do stainless steel instruments but may be more susceptible to breakage. The processes of wear and breakage of nickel-titanium and stainless steel instruments were examined. Sixty files of five types (12 each) and three manufacturers were used. All were used repeatedly in curved canals until failure or for a maximu of 22 minutes. Each instrument was examined with scanning electron microscopy both new (control) and at s paced intervals for evidence of wear and fatigue. All new instruments were of good quality. Stainless steel instruments tended to wear the most rapidly, and next were nickel-titanium rotary instruments; the most resistant to wear were nickel-titanium hand instruments. There were few instrument separations. In general, nickl-titanium (particularly hand) instruments resisted deterioration better than did stainless steel. Nickel-titanium rotary instruments (2 of 12) had the most breakage.

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