J. Orthod.
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British Journal of Orthodontics, Vol 23, 37-41, Copyright © 1996 by British Orthodontic Society

ARTICLES

The effects of cross-infection control procedures on the tensile and flexural properties of superelastic nickel-titanium wires

OP Crotty, EH Davies and SP Jones
Eastman Dental Institute, London, UK.

The development of superelastic nickel-titanium archwires has simplified the alignment phase of orthodontic treatment by permitting the use of highly flexible, resilient archwires and avoiding the need for complex loops. The majority of these archwires appear undistorted when removed from the mouth after use. This feature, coupled with the disadvantage of relatively high cost has led to sterilization and recycling of these wires by some clinicians. This study was designed to examine the effects of currently used infection control procedures on the mechanical properties of superelastic nickel-titanium alloy (SENTA) archwires. One-hundred-and-forty lengths of a SENTA wire were subjected to various sterilization and disinfection procedures. These included cold disinfection in 2 per cent glutaraldehyde solution for 3- and 24- hour cycles, and steam autoclaving. Single and double cycles were used. The properties investigated were the 0.1 per cent yield strength, the ultimate tensile strength, and the flexural rigidity. No statistically significant differences were found between the groups or against an untreated control.




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Copyright © 1996 British Orthodontic Society.