Effects of cold disinfectants on the mechanical properties and the surface topography of nickel-titanium arch wires.

The effects of disinfectants on the mechanical properties and surface topographies were determined for 0.017 x 0.025-inch Nitinol and Titanal wires. Three disinfectants approved by the American Dental Association were tested at maximum antimicrobial concentrations: 2% acidic glutaraldehyde, chlorine dioxide, and iodophor. Bending and tensile tests were evaluated to determine whether the stiffness, strength, or range of the wires changed after disinfectant treatment. Laser spectroscopy was used to detect surface changes from corrosion or tarnish after treatment. No detrimental changes were detected in the mechanical properties or surface topography of either wire product after disinfectant treatment. Nitinol was found to be stronger and stiffer than Titanal. On average, Titanal exhibited five times more specular reflectivity than Nitinol.