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Effects of sodium hypochlorite on nickel‐titanium Lightspeed® instruments
Author(s) -
Busslinger,
Sener,
Barbakow
Publication year - 1998
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1046/j.1365-2591.1998.00149.x
Subject(s) - sodium hypochlorite , corrosion , nickel , titanium , materials science , endodontics , nuclear chemistry , sodium , metallurgy , chemistry , dentistry , medicine , organic chemistry
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 μL 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.