Department of Orthodontics, School of Dentistry, State University of Rio de Janeiro, Boulevard 28 de Setembro, 157, Vila Isabel, Rio de Janeiro, RJ, 20551-030, Brazil.
Sous-section Orthopédie Dento-Faciale, Faculté de Chirurgie dentaire, Université de Nice Sophia Antipolis, Nice, France.
Prog Orthod. 2020 May 4;21(1):11. doi: 10.1186/s40510-020-00311-x.
To compare dentoskeletal changes produced by the maxillary splint headgear and cervical headgear appliance during the early phase of Class II treatment, specially the initial overjet and upper incisors position.
In this retrospective study, 28 Class II patients treated with the maxillary splint headgear (MSG, mean age 10.1 ± 1.9 years) and 28 Class II patients treated with cervical headgear (CHG, mean age 9.5 ± 1.9 years) were evaluated before and after treatment. Statistical comparisons between the two groups for cephalometric measurements at T1 and for T2-T1 changes were performed by means of independent sample t tests.
The MSG showed a significantly greater reduction of the overjet in comparison to the CHG (- 2.4 mm and - 0.7 mm, respectively) and a significantly greater maxillary incisor uprighting (- 1.8 mm and 0.4 mm, respectively). In the MSG, overjet correction was due mainly to mandibular advancement (3.5 mm), while the correction of molar relationship (3.9 mm) was 64% skeletal and 36% dentoalveolar. In the CHG, the overjet correction was also more skeletal, due to mandibular growth (1.8 mm), while correction of molar relationship (3.5 mm) was 63% dentoalveolar and 37% skeletal.
Both groups showed favorable skeletal mandibular changes, which was more significant in the MSG. Regarding tooth movement, the maxillary splint headgear was more effective in uprighting upper incisors and reducing the overjet than cervical headgear appliance.
比较上颌分裂头帽和颈头帽矫治器在 II 类治疗早期产生的牙颌变化，特别是初始覆颌和上颌切牙位置。
在这项回顾性研究中，评估了 28 例接受上颌分裂头帽（MSG，平均年龄 10.1±1.9 岁）和 28 例接受颈头帽（CHG，平均年龄 9.5±1.9 岁）治疗的 II 类错颌患者。在 T1 时，通过独立样本 t 检验对两组的头影测量值进行比较，并对 T2-T1 变化进行比较。
MSG 组与 CHG 组相比，覆颌明显减少（分别为-2.4mm 和-0.7mm），上颌切牙直立度明显增加（分别为-1.8mm 和 0.4mm）。在 MSG 中，覆颌的矫正主要是由于下颌前伸（3.5mm），而磨牙关系的矫正（3.9mm）则有 64%为骨骼性，36%为牙源性。在 CHG 中，由于下颌生长（1.8mm），覆颌的矫正也更具骨骼性，而磨牙关系的矫正（3.5mm）则有 63%为牙源性，37%为骨骼性。
两组均显示出有利的下颌骨骼变化，MSG 组更为显著。关于牙齿移动，上颌分裂头帽在上颌切牙直立和减少覆颌方面比颈头帽更有效。
