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Effects of sodium hypochlorite on nickel-titanium Lightspeed instruments.
Journal article

Effects of sodium hypochlorite on nickel-titanium Lightspeed instruments.

  • 1998-11-21
Published in:
  • International endodontic journal. - 1998
Analysis of Variance
Corrosion
Dental Instruments
Nickel
Root Canal Irrigants
Root Canal Preparation
Sodium Hypochlorite
Titanium
English Sodium hypochlorite is a major irrigant in endodontics, and nickel-titanium instruments are gaining in popularity. This paper investigated the corrosion of nickel-titanium Lightspeed instruments in 1% and 5% NaOCl solutions. The instruments were immersed in ultrasonicated NaOCl solutions for varying times up to 1 h. Corrosion was determined by electrothermal absorption spectrometry in 100 microL aliquots of NaOCl. Background contamination of nickel in the 1% and 5% NaOCl solutions used was low, but high enough to interfere in detecting any increases in nickel after immersing the instruments. The amounts of titanium recorded in the 1% NaOCl solutions were insignificant. However, a statistically significant amount of titanium was detected from the Lightspeed instruments after immersion times of 30 and 60 min in 5% NaOCl. Clinically such instruments do not have an 'in situ' time of 30 min, and this corrosion may be considered irrelevant clinically.
Language
  • English
Open access status
closed
Identifiers
Persistent URL
https://sonar.ch/global/documents/185703
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