Postgraduate School of Orthodontics, University of Ferrara, Ferrara, Italy.
Department of Orthodontics, Dental School, University of Geneva, 1205 Geneve, Switzerland.
Prog Orthod. 2023 Sep 18;24(1):30. doi: 10.1186/s40510-023-00482-3.
To investigate the accuracy of torque, tip and rotation and linear intra-arch movements yielded by passive self-ligating lingual straight-wire appliances with brackets featuring square slots.
Twenty-five adult Caucasian patients (16 females and 9 males; mean age 26.5 ± 4.3 years) with Class I or mild Class II head-to-head malocclusion were orthodontically treated via passive lingual self-ligating straight-wire appliances (ALIAS, Ormco, Orange, CA) with no extraction. Records were retrospectively analysed, and digital models of pre-treatment (T0), planned (T1) and achieved (T2) phase were acquired for both arches in each patient via an intraoral scanner (Medit I500 (iScan Medit, Seoul, Korea). VAM software (Vectra, Canfield Scientific, Fairfield, NJ, USA) was used to measure both angular values (torque, tip and rotation) and linear intra-arch widths (between canines, first and second premolars and first and second molars). Measurements were obtained for all the movements investigated for each tooth group (incisors, canines, premolars and molars), by arch (maxillary and mandibular) and for both arches at T0, T1 and T2. The accuracy of angular values was compared using Student's t-test against a hypothetical 100%, and among the various tooth groups by post-hoc tests. Transverse linear measurements were investigated by means of the non-parametric Friedman test. The significance threshold was set at 0.05.
The mean accuracy of angular values was 77.25 ± 7.71% for torque, 78.41 ± 6.17% for tip and 77.99 ± 6.58% for rotation. In all cases, however, there was a significant difference between planned and achieved movements, and accuracy was significantly lower than the hypothetical 100% for all tooth groups, individual arches and dentition (p < 0.001). For intra-arch diameters, the greatest accuracy values were found for the anterior sectors (83.54 ± 5.19% for the maxillary inter-canine distance) and the lowest for the posterior sectors (67.28% for the maxillary inter-second molar distance).
Straight-wire lingual treatment with passive self-ligating appliances featuring with square slot displayed excellent clinical accuracy, albeit with statistical accuracy decreasing antero-posteriorly.
研究方槽被动自锁托槽直丝弓矫治器产生的转矩、倾斜和扭转以及弓丝内的线性弓形移动的准确性。
25 名成人白种错颌畸形患者（16 名女性和 9 名男性；平均年龄 26.5±4.3 岁）接受了无拔牙的被动舌侧自锁直丝弓矫治（Ormco，橙 CA 的 ALIAS）。通过口内扫描仪（Medit I500（iScan Medit，首尔，韩国））对每个患者的上下牙弓在治疗前（T0）、计划（T1）和达到（T2）阶段进行了回顾性分析，并获得了数字模型。Vectra（Canfield Scientific，Fairfield，NJ，美国）软件用于测量所有牙齿组（切牙、尖牙、前磨牙和磨牙）的角度值（转矩、倾斜和扭转）和弓丝内的线性宽度（尖牙间、第一前磨牙和第二前磨牙间以及第一和第二磨牙间）。通过对每个牙组（切牙、尖牙、前磨牙和磨牙）、上下牙弓以及 T0、T1 和 T2 时的所有运动进行测量，比较了角度值的准确性。使用学生 t 检验与假设的 100%进行比较，并通过事后检验比较了不同牙组之间的角度值。通过非参数 Friedman 检验研究了横向线性测量。显著性阈值设为 0.05。
转矩的平均准确性为 77.25±7.71%，倾斜为 78.41±6.17%，扭转为 77.99±6.58%。然而，在所有情况下，计划和达到的运动之间都有显著差异，而且所有牙齿组、个体牙弓和牙列的准确性都显著低于假设的 100%（p<0.001）。对于弓丝内的直径，最大的准确性值在前牙区（上颌尖牙间距离为 83.54±5.19%），而后牙区的准确性值最低（上颌第二磨牙间距离为 67.28%）。
具有方槽的被动自锁托槽直丝弓矫治器的直丝弓矫治具有出色的临床准确性，尽管前后方向的准确性呈下降趋势。
