Angle Orthod. 2023 Jan 1;93(1):3-10. doi: 10.2319/032322-237.1.
To compare the efficacy and efficiency between clear aligners and 2 × 4 fixed appliances for correcting maxillary incisor position irregularities in the mixed dentition.
The sample comprised 32 patients from 7 to 11 years of age randomly allocated into two parallel treatment groups: the clear aligners group, 14 patients (6 girls, 8 boys) with a mean initial age of 9.33 years (standard deviation [SD] = 1.01) treated with clear aligners; and the fixed appliances group, 13 patients (9 girls, 4 boys) with a mean initial age of 9.65 years (SD = 0.80) treated with partial (2 × 4) fixed appliances. Digital models were acquired before treatment and after appliance removal. Primary outcomes were incisor irregularity index and treatment time. Secondary outcomes were arch width, perimeter, length, size and shape, incisor leveling, incisor mesiodistal angulation, plaque index, and white spot lesion formation (International Caries Detection and Assessment System index). Intergroup comparisons were evaluated using t-tests or Mann-Whitney U-tests with Holm-Bonferroni correction (P < .05).
Treatment time was approximately 8 months in both groups. No intergroup differences were observed for changes in any of the variables. Similar posttreatment arch shapes were observed in both groups.
Clear aligners and 2 × 4 mechanics displayed similar efficacy and efficiency for maxillary incisor position corrections in the mixed dentition. The choice of appliance should be guided by clinician and family preference.
比较透明牙套和 2×4 固定矫治器在混合牙列中矫正上颌切牙位置不规则的疗效和效率。
本研究纳入了 32 名 7-11 岁的患者，随机分为两组平行治疗组：透明牙套组 14 名患者（6 名女孩，8 名男孩），平均初始年龄为 9.33 岁（标准差 [SD] = 1.01），采用透明牙套治疗；固定矫治器组 13 名患者（9 名女孩，4 名男孩），平均初始年龄为 9.65 岁（SD = 0.80），采用部分（2×4）固定矫治器治疗。在治疗前和矫治器拆除后获取数字模型。主要结果是切牙不规则指数和治疗时间。次要结果是牙弓宽度、周长、长度、大小和形状、切牙排齐、切牙近远中倾斜角、菌斑指数和白色斑点形成（国际龋病检测和评估系统指数）。采用 t 检验或曼-惠特尼 U 检验（Holm-Bonferroni 校正，P<.05）对组间比较进行评估。
两组的治疗时间均约为 8 个月。两组间任何变量的变化均无组间差异。两组治疗后牙弓形状相似。
透明牙套和 2×4 力学在混合牙列中矫正上颌切牙位置具有相似的疗效和效率。矫治器的选择应根据临床医生和患者的偏好进行指导。
