Angle Orthod. 2022 Jan 1;92(1):45-54. doi: 10.2319/021421-126.1.
To evaluate anchorage control using miniscrews vs an Essix appliance in treatment of Class II malocclusion by distalization using the Carrière Motion Appliance (CMA).
Twenty-four postpubertal female patients with Class II, division 1 malocclusion were randomly distributed into two equal groups. CMA was bonded in both groups, and one group was treated with miniscrews as anchorage (12 patients, mean age = 18.0 years) while the other group was treated with an Essix appliance as anchorage (12 patients, mean age = 17.8 years). For each patient, two cone-beam computed tomographic scans were obtained: one preoperatively and another after completion of distalization.
In the Essix appliance group, there was a statistically significant anterior movement (2.2 ± 1.43 mm) as well as proclination of the lower incisor (5.3° ± 4.0°), compared to a nonsignificant anterior movement (0.06 ± 1.45 mm) and proclination (0.86° ± 2.22°) in the miniscrew group. The amount of maxillary molar distalization was higher in the miniscrew group (2.57 ± 1.52 mm) than in the Essix appliance group (1.53 ± 1.11 mm); however, the difference was not statistically significant.
Miniscrews led to a decrease in the amount of anchorage loss in the mandibular incisors, both in terms of anterior movement and proclination.
通过 Carrière 矫治器（CMA）远移来评估使用微螺钉和 Essix 矫治器作为支抗治疗安氏Ⅱ类 1 分类错（牙合）的支抗控制情况。
将 24 名安氏Ⅱ类 1 分类错（牙合）的青春期后女性患者随机分为两组。两组均粘结 CMA，一组使用微螺钉作为支抗（12 名患者，平均年龄=18.0 岁），另一组使用 Essix 矫治器作为支抗（12 名患者，平均年龄=17.8 岁）。每位患者均拍摄两次锥形束 CT：一次是在术前，另一次是在远移完成后。
在 Essix 矫治器组中，下切牙出现了明显的前牙移动（2.2±1.43mm）和前倾（5.3°±4.0°），而在微螺钉组中，下切牙仅出现了轻微的前牙移动（0.06±1.45mm）和前倾（0.86°±2.22°），差异具有统计学意义。微螺钉组上颌磨牙远移量（2.57±1.52mm）高于 Essix 矫治器组（1.53±1.11mm），但差异无统计学意义。
微螺钉减少了下颌切牙支抗丧失量，无论是前牙移动还是前倾。
