Zhang X, Su X
2nd Affiliated Hospital of Wenzhou Medical College.
Zhongguo Yi Xue Ke Xue Yuan Xue Bao. 1993 Oct;15(5):360-3.
Malocclusion and dentofacial deformity in class III is always characterized by maxillary skeletal retrusion and/or mandibular protrusion. It affects function and facial esthetics. An orthopedic mask appliance with class III extraoral traction made by the authors was applied in 48 cases from Aug. 1985 to Oct. 1991. The study population included 5 patients with deciduous dentition, 30 with permanent dentition, and 13 with mixed dentition. The second deciduous molars or permanent first molars are a class III relationship. These exhibited bilateral crossbites and negative overjet greater than 5 mm severe arch length discrepancies existed in both arches, maxillary skeletal retrusion and/or mandibular protrusion. The results of these 48 cases were very satisfactory. The relationship between maxillary and mandibular second deciduous molar or permanent first molar all showed centric occlusal position. Dentofacial orthopedics therapy is one of the most important treatments of malocclusion and dentofacial deformity. The choice of therapy and orthodontic force must follow the age and endurance of the patient. Also, exercise of the tongue muscle must be considered.
Ⅲ类错颌畸形和牙颌面畸形通常以上颌骨骨骼后缩和/或下颌前突为特征。它会影响功能和面部美观。作者制作的带有Ⅲ类口外牵引的矫形面罩矫治器于1985年8月至1991年10月应用于48例患者。研究对象包括5例乳牙列患者、30例恒牙列患者和13例混合牙列患者。第二乳磨牙或第一恒磨牙呈Ⅲ类关系。这些患者均表现为双侧反牙合，前牙反覆盖大于5mm，上下牙弓均存在严重的牙弓长度差异、上颌骨骨骼后缩和/或下颌前突。这48例患者的治疗效果非常令人满意。上颌和下颌第二乳磨牙或第一恒磨牙的关系均显示为正中咬合位。牙颌面矫形治疗是错颌畸形和牙颌面畸形最重要的治疗方法之一。治疗方法和正畸力的选择必须根据患者的年龄和耐受程度。此外，还必须考虑舌肌锻炼。
