Xie Jinchen, Liu Fen, Sang Ting, Wu Jun
School of Stomatology, Nanchang University & Jiangxi Province Clinical Research Center for Oral Diseases & Jiangxi Province Key Laboratory of Oral Biomedicine, Nanchang, Jiangxi, China.
School of Stomatology, Nanchang University & Jiangxi Province Clinical Research Center for Oral Diseases & Jiangxi Province Key Laboratory of Oral Biomedicine, Nanchang, Jiangxi, China.
Am J Orthod Dentofacial Orthop. 2023 Apr;163(4):540-552.e2. doi: 10.1016/j.ajodo.2022.04.017. Epub 2022 Dec 22.
The objectives of this study were to evaluate the clinical efficacy of SmartTrack aligner in rotational movement of the anterior tooth by 15°-30°, and to analyze the factors influencing anterior tooth rotational movement.
A total of 212 teeth, including 4 tooth types (maxillary central incisor, maxillary lateral incisor, mandibular central incisor, and mandibular canine) that require anterior tooth rotational movement by 15°-30° were selected from 123 patients, with a mean age of 25.6 years. Rotational movements were calculated from the superimposition of the initial and predicted models (predicted rotational movement) and from the superimposition of the initial and achieved models (achieved rotational movement) using the best-fit alignment tool in NX Imageware. The difference between the predicted and achieved rotational movements (DPARM) was calculated. Univariate analysis, categorical regression analysis, and subgroup analysis were performed on 7 variables: age, gender, tooth type, predicted rotational movement, attachment type, interproximal reduction (IPR), and the total number of active aligners.
The mean DPARM when the anterior tooth was rotated 15°-30° was 4.46° (range, -3.52° to 25.28°). Regression analysis showed that the patient's age, IPR, tooth type, and predicted rotational movement affected DPARM (P <0.01).
Factors influencing the DPARM of the anterior tooth include the patient's age, tooth type, the magnitude of the predicted rotational movement, and whether or not IPR was prescribed.
本研究的目的是评估SmartTrack矫治器在前牙旋转15°-30°时的临床疗效，并分析影响前牙旋转移动的因素。
从123例患者中选取共212颗需要前牙旋转15°-30°的牙齿，包括4种牙型（上颌中切牙、上颌侧切牙、下颌中切牙和下颌尖牙），患者平均年龄25.6岁。使用NX Imageware中的最佳拟合对齐工具，通过初始模型与预测模型的叠加（预测旋转移动）以及初始模型与实际完成模型的叠加（实际旋转移动）来计算旋转移动。计算预测旋转移动与实际旋转移动之间的差值（DPARM）。对年龄、性别、牙型、预测旋转移动、附件类型、邻面去釉（IPR）和主动矫治器总数7个变量进行单因素分析、分类回归分析和亚组分析。
前牙旋转15°-30°时的平均DPARM为4.46°（范围为-3.52°至25.28°）。回归分析表明，患者年龄、IPR、牙型和预测旋转移动会影响DPARM（P<0.01）。
影响前牙DPARM 的因素包括患者年龄、牙型、预测旋转移动的幅度以及是否进行了IPR。
