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目的:探讨以乳磨牙为支抗的上腭快速扩大联合前牵引矫治早期骨性Ⅲ类错合并后牙反畸形患者腭形态的变化。方法:12例替牙早期骨性Ⅲ类错合并后牙反病例,第一阶段Hyrax支架式上腭快速扩大器扩大2-3周至上颌牙舌尖咬在下颌牙颊尖。第二阶段前牵引至前牙覆盖2～4mm,对矫治前后模型进行腭形态测量。结果:腭底宽增加1.98mm±0.97mm,磨牙距增加5.04mm±1.30mm,腭底宽增加量/磨牙距的增加量为41%,上颌牙槽突夹角增加8.57°±4.05°,左磨牙的倾斜角颊倾8.99°±4.06°,右磨牙的倾斜角颊倾8.34°±3.94°,变化均有显著性差异。腭深度改变无显著性差异。结论:上腭快速扩大联合前牵引是矫治替牙早期骨性Ⅲ类错合并后牙反畸形的较好方法,腭底宽、磨牙距、上颌牙槽突夹角、磨牙倾斜角的增加均有显著性差异。腭的明显变化使畸形的上腭趋向正常。
OBJECTIVE: To investigate the changes of palatal palate morphology in patients with early skeletal class Ⅲ malocclusion complicated with posterior tibiofemoral deformity by palatal palate rapid expansion combined with molars. Methods: Twelve patients with early skeletal Class Ⅲ malocclusion complicated with posterior tarsal inverted pharynx were enrolled. The first stage of Hyrax stent-palatal rapid enlargement was extended for 2-3 weeks until the maxillary lingual tip was bitten at the maxillary dentate. Before the second stage of traction to the anterior teeth covered 2 ~ 4mm, palate morphology before and after treatment of the model measurement. Results: The width of the palatal floor increased by 1.98 mm ± 0.97 mm, the molar distance increased by 5.04 mm ± 1.30 mm, the increase of the palatal floor width / the increase of molar distance was 41%, the maxillary alveolar protrusion angle increased by 8.57 ° ± 4.05 °. The inclination angle of molars was 8.99 ° ± 4.06 ° and the inclination angle of right molars was 8.34 ° ± 3.94 °. There were significant differences between the two groups. Palate depth changes no significant difference. Conclusions: Rapid palatal expansion combined with pre-traction is a good way to treat early skeletal Class Ⅲ malocclusion complicated with posterior tarsal deformity. The wide palatal floor, molar distance, maxillary alveolar ridge angle and molar inclinations There are significant differences. Obvious changes in the palate so that the normal palate deformity.