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目的:探讨Twin-block功能矫治器早期矫治骨性Ⅱ类错所引起的牙、牙槽以及颌骨的变化。方法:对23例处于生长发育期的以下颌后缩为特征的Ⅱ类患者进行Twin-block功能矫治,对其治疗前后硬组织X线头影测量进行Pancherz分析。结果:治疗后,磨牙关系与前牙覆盖得到改善,下颌向有利的方向发育。前牙覆盖的改善51%为骨骼因素,49%为牙性因素。磨牙关系的改善66%为骨骼因素,34%为牙性因素。结论:Twin-block矫治器对骨性Ⅱ类错的矫治是有效的,包括矫形作用与正畸作用。
OBJECTIVE: To investigate the changes of teeth, alveoli and jaw induced by Twin-block appliance in early stage of skeletal Class Ⅱ malocclusion. Methods: Twenty-three patients with growth-distorted mandibular retrusion were enrolled in this study. Twin-block functional correction was performed. Panclerz analysis was performed before and after treatment. Results: After treatment, the relationship between molars and anterior teeth coverage improved and the mandible developed in a favorable direction. 51% improvement in anterior tooth cover is a skeletal factor and 49% is an orthodontic factor. Molar relationship improvement of 66% for the skeletal factor, 34% for the dental factors. Conclusion: Twin-block appliance is effective in the treatment of skeletal Class Ⅱ malocclusion, including orthopedic and orthodontic effects.