Análise dos efeitos do tratamento térmico em fios de aço inoxidável em fios de CrNi secção retangular

Abstract

The heat treatment of the stainless steel wire is a routine clinical procedure adopted as for many dentists in order to relieve stress caused after performing folds in the arc, helping to improve the mechanical properties. Despite the acceptance of this procedure by professionals, the efficiency of heat treatment stove still generates controversy in orthodontic means. The objective of this study was to evaluate the influence of heat treatment of stainless steel wire with a rectangular section .016'' x .022'' on the dimensional stability under mechanical properties. For analysis of dimensional stability were evaluated anterior and posterior dimensions of 40 stainless steel orthodontic arches .016'' x.022'' without heat treatment and after completion of the heat treatment. For analysis of the mechanical properties were tested 12 stainless steel wire segments of the same rectangular section without heat treatment and after completion of the heat treatment through tensile tests. To see if there were differences between the front and rear dimensions, the results were analyzed by T de Student test. To compare the tensile strength and deformity between the groups, we used the ANOVA test. The level of significance was provided with 95% (p <0.05). With the findings of this study we conclude that heat treatment did not stop the expansion of arches 30 days after its preparation and heat-treated wires have mechanical behavior similar to steel wires which were not subjected to heat treatment.