To compare the clinical efficiency of premium heat-activated copper nickel-titanium (Tanzo Cu-NiTi) and NT3 superelastic NiTi during initial orthodontic alignment. A total of 50 patients were randomly allocated to 1 of 2 different archwire types (group 1, Tanzo Cu-NiTi; group 2, NT3 superelastic NiTi). Eligibility criteria included Class I or Class II malocclusion, moderate maxillary anterior crowding, and healthy periodontal condition. Impressions of the upper arches were taken before archwire placement (T0) and at every 4 weeks (T1, T2, T3, and T4). For T1 and T2 stages, 0.014-in., and for T3 and T4 stages, 0.018-in. archwires were used. The primary outcome was the alignment efficiency assessed using Little’s irregularity index. The secondary outcomes were arch width and incisor inclination changes. Data were analyzed using independent samples t test, repeated measures ANOVA, and Mann-Whitney U test. Marginal models were established for the estimation of coefficients. The anterior irregularity index reduction was mostly observed between T0 and T2 periods, which were respectively − 7.40 ± 0.50 mm (p < 0.001; 95% CI, − 8.94, − 5.85) and − 6.80 ± 0.55 mm (p < 0.001; 95% CI, − 8.49, − 5.12) for groups 1 and 2 (p < 0.001). With both wires, Little’s irregularity index decreased over time, and the difference between the groups was not significant (p = 0.581; estimated effect size, 0.011). No statistically significant difference was found between the groups in terms of intercanine and intermolar width and incisor inclination changes. There were no significant between-group differences in alignment efficiency, arch width, and incisor inclination change. There was an increased alignment with 0.014-in. compared with 0.018-in. diameter archwire.

中文翻译：

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在青少年正畸初期，优质热活化铜镍钛和超弹性镍钛弓丝之间的临床疗效比较评估：一项随机临床试验

为了比较优质热活化铜镍钛（Tanzo Cu-NiTi）和NT3超弹性镍钛合金在正畸初期的临床效率。共有50名患者被随机分配到2种不同弓丝类型中的1种（第1组，Tanzo Cu-NiTi；第2组，NT3超弹性NiTi）。资格标准包括I级或II级错牙合，中度上颌前部拥挤和牙周健康。在放置弓丝之前（T0）和每4周（T1，T2，T3和T4）采集上弓的印象。对于T1和T2级，为0.014英寸，对于T3和T4级，为0.018英寸。使用了弓丝。主要结果是使用Little的不规则指数评估的比对效率。次要结果是足弓宽度和门牙倾斜度变化。使用独立样本t检验，重复测量ANOVA和Mann-Whitney U检验分析数据。建立了用于估计系数的边际模型。在T0和T2时期之间的前部不规则指数减少最多，分别为-7.40±0.50 mm（p <0.001; 95％CI，-8.94，-5.85）和-6.80±0.55 mm（p <0.001; 95％）第1组和第2组的CI为− 8.49，− 5.12）（p <0.001）。两种导线的利特氏不规则指数均随时间降低，两组之间的差异不显着（p = 0.581；估计效应量为0.011）。就犬齿间和臼齿间的宽度以及门牙倾斜度的变化而言，两组之间没有统计学上的显着差异。对准效率，牙弓宽度，和门牙倾斜度变化。与0.014英寸的比对增加。相比于0.018英寸 直径弓丝。