This study compared time to correction of mandibular anterior crowding using two arch wire sequences, one with conventional nickel-titanium (NiTi) arch wires and the other with conventional and NiTi heat-activated arch wires. Twenty-two boys and girls (mean age: 16.68 ± 2.66) with moderate crowding (3–6 mm) were assigned randomly to one of two groups and followed up for five months (six assessments) when arch wires were changed. Time to crowding correction was analyzed statistically using the Kaplan-Meier method. Data were collected during the five-month follow-up, and time to correction was compared between groups using the log rank test. At the end of follow-up, mandibular crowding was corrected in 100% of the cases in the group treated with the sequence that included NiTi heat-activated arch wires, whereas about 30% of those treated with NiTi arch wires were not completely corrected. There was a significant difference in time to complete treatment between groups (log rank = 5.996; p < 0.05). In the group treated with the sequence that included heat-activated wires, alignment and leveling of mandibular anterior teeth were completed earlier than in the group treated only with conventional NiTi arch wires. Clinical trial registration is found at .
展开▼
机译：这项研究将时间与使用两种弓丝序列校正下颌前部拥挤的时间进行了比较，一种序列使用常规的镍钛（NiTi）弓丝，另一种采用常规的和NiTi热激活弓丝。 22名中度拥挤（3–6mm）的男孩和女孩（平均年龄：16.68±2.66）被随机分配到两组中的一组，并在更换弓丝时进行了为期五个月的随访（六个评估）。使用Kaplan-Meier方法统计分析了校正拥挤的时间。在五个月的随访期间收集了数据，并使用对数秩检验比较了两组之间的校正时间。随访结束时，在包括镍钛热激活弓丝在内的顺序治疗组中，有100％的病例矫正了下颌拥挤，而镍钛弓丝治疗的大约30％的病例没有得到完全矫正。两组之间完成治疗的时间存在显着差异（对数秩= 5.996； p <0.05）。在使用包括热激活金属丝的顺序治疗的组中，下颌前牙的对齐和矫直比仅使用常规NiTi弓丝治疗的组更早完成。可在上找到临床试验注册。
展开▼
