The physical properties of tin ion-plated Co-Cr (elgiloy) orthodontic wires

Kim, Jung Min; Kwon, Oh Won; Kim, Kyo Han

Abstract

To estimate the possibility of clinical application of TiN ion-plated Elgiloy(Co-Cr wire), measurements of tensile strength and hardness were made on the four tempers on each of the manufactured Elgiloy, the (heat-treated) Elgiloy for 30 minutes at 250degrees C and the TiN ion-plated Elgiloy. For comparison, the tensile strength and hardness of Stainless Steel wires were also measured. The following are the results of the study: · In the 4 tempers, tensile strength was the greatest in the TiN ion-plated group, followed by the heat-treated Elgiloy group and the manufactured Elgiloy group, but no statistical difference was noticed between heat-treated and manufactured Elgiloy groups(P<0.05). · In each temper, tensile strength- of ion-plated Elgiloy increased- about l0kgf/mm` in comparison with the values of the manufactured Elgiloy. · In yellow, green and red tempers except the blue, hardness was the greatest in ion-plated group. In the blue temper, there was no statistical difference between heat: treated and manufactured Elgiloy groups(P<0.05). · In each temper, hardness of ion-plated Elgiloy increased about 50-90VHN in comparison with the values of the manufactured Elgiloy. · The tensile strength of Stainless Steel wire was similar to that of the red temper of manufactured Elgiloy and the green temper of ion-plated Elgiloy.