The effect of electric spot-welding on the mechanical properties of different orthodontic wire alloys
The effect of electric spot-welding on the mechanical properties of different orthodontic wire alloys
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DOI：
10.1590/s1516-14392012005000049
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发表时间：
2012-06-01
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影响因子：
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通讯作者：
Nojima, Lincoln Issamu
中科院分区：
文献类型：
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作者：
Nascimento, Leonard Euler Andrade Gomes;Santos, Rogério Lacerda dos;Nojima, Lincoln Issamu
本研究的目的是测试的假设，有一个直接的关系，表面结构和抗拉强度的正畸合金提交到不同水平的焊接电流。评估了三种类型的合金。制作108个横截面测试样本（“X”），每个丝组合18个，并分为6组：SS（钢-钢）; SN（钢-NiTi）; SB（钢-β-Ti）; NN（NiTi-NiTi）; NB（NiTi-β-Ti）和BB（β-Ti-β-Ti），在不同电流水平下进行6次点焊程序（Super Micro Ponto 3000）。使用Student-Newman-Keuls、Wilcoxon符号秩和Kruskal-Wallis检验（p <0.05）。SN组与所有其他合金组合之间存在统计学差异（p <0.05）。合金的初始粗糙度范围为0.04至0.55 Ra，组间存在统计学差异（p <0.001）。该假设被拒绝，钛合金组合钢x β-Ti的拉伸强度受到P50电流水平的显著影响，这改变了丝的性能和结构。
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 x Beta-Ti was significantly affected by the current level at P50, which changed the properties and structure of the wires.