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.

中文翻译：

---

上颌夹板头饰在早期矫正II类错牙合中的牙齿骨骼影响。

为了比较在II类治疗的早期阶段，特别是最初的过喷射和上门牙位置，上颌夹板头套和颈头套矫治器产生的牙本质骨骼变化。在这项回顾性研究中，在治疗前后评估了28例上颌夹板头套治疗的II类患者（MSG，平均年龄10.1±1.9岁）和28例上颈椎板治疗的II类患者（CHG，平均年龄9.5±1.9岁）。 。通过独立的样本t检验对两组进行T1时的头颅测量和T2-T1的变化进行统计学比较。与CHG（分别为-2.4 mm和-0.7 mm）相比，MSG的过喷射减少量更大（分别为-1.8 mm和0.4 mm），上颌切牙直立度也更大。在味精中，过喷射矫正主要是由于下颌前移（3.5毫米），而磨牙关系（3.9毫米）的矫正是骨骼的64％和牙槽膜的36％。在CHG中，由于下颌骨生长（1.8 mm），过喷射矫正也更是骨骼，而摩尔关系（3.5 mm）的矫正为63％牙槽骨和37％骨骼。两组均显示出良好的下颌骨变化，在MSG中更为显着。关于牙齿运动，上颌夹板头饰比上颈托具更有效地竖立上门牙并减少过喷射。由于下颌骨生长（1.8 mm），而磨牙关系（3.5 mm）的矫正为63％的牙槽骨和37％的骨骼。两组均显示出良好的下颌骨变化，在MSG中更为显着。关于牙齿运动，上颌夹板头饰比上颈托具更有效地竖立上门牙并减少过喷射。由于下颌骨生长（1.8 mm），而磨牙关系（3.5 mm）的矫正为63％的牙槽骨和37％的骨骼。两组均显示出良好的下颌骨变化，在MSG中更为显着。关于牙齿运动，上颌夹板头饰比上颈托具更有效地竖立上门牙并减少过喷射。