The effect of electric spot-welding on the mechanical properties of different orthodontic wire alloys
AUTOR(ES)
Nascimento, Leonard Euler Andrade Gomes, Santos, Rogério Lacerda dos, Pithon, Matheus Melo, Araújo, Mônica Tirre de Souza, Nojima, Matilde Gonçalves, Nojima, Lincoln Issamu
FONTE
Materials Research
DATA DE PUBLICAÇÃO
29/05/2012
RESUMO
The aim of this study was to test the hypothesis that there is a direct relationship between surface structure and tensile strength of orthodontic alloys submitted to different levels of welding current. Three types of alloys were assessed. One hundred and eight cross-sectional test specimens ("X") were made, 18 for each wire combination, and divided into 6 groups: SS (steel-steel); SN (steel-NiTi); SB (steel-Beta-Ti); NN (NiTi-NiTi); NB (NiTi-Beta-Ti) and BB (Beta-Ti-Beta-Ti), submitted to 6 spot-welding procedures at different levels of current (Super Micro Ponto 3000). Student-Newman-Keuls, Wilcoxon signed-rank, and Kruskal-Wallis tests were used (p < .05). Statistical difference was found between SN group and all the other alloy combinations (p < .05). Initial roughness of alloys ranged from .04 to .55 Ra, with statistical difference between groups (p < .001). The hypothesis was rejected and the tensile strength of Ti-alloys combinations Steel × Beta-Ti was significantly affected by the current level at P50, which changed the properties and structure of the wires.
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