头帽颏兜治疗早期骨型前牙反畸形的疗效分析

目的：探讨头帽颏兜治疗早期骨型前牙反Ｈｅ的效果。方法：使用头帽颏兜，双侧共施加７００－１０００ｇ的矫治力治疗早期骨型前牙反Ｈｅ患者１３６例，通过治疗前后模型，计算每一患者下颌相对于上颌位置变化的距离。分析４个组虱的下颌相对于上颌位置变化的距离，疗程及下颌相对于上颌位置变化的速度。结果；Ｃ１，Ｃ２，Ｃ３组患者（３－１１岁）疗效明显，Ｃ１组患者（３－５岁）疗程最短。结论：应用头帽颏兜治疗早期骨型前牙反

Effects of Chincap Therapy for Early Anterior Crossbite

OBJECTIVE: To analysis the effects of chincap therapy for early anterior crossbite and mandibular prognathism. METHODS: 136 patients anterior crossbite and mandibular prognathism aged from 3 to 14 years old at the start of treatment were treated with active chincap with bilateral force of 700 to 1000 gram. Every patient wore chin cap 12 to 14 hours daily, and most of those patients used removable appliances to open the crossbite of incisors. According to the age of patients, they were divided into four groups, C1 (3-5 years old), C2 (6-8 years old), C3 (9-11 years old) and C4 (12-14 years old). When the treatment ended after two years, we analyzed the models by measuring the length of maxillary on the models before and after treatment (U1 and U2 that's the distance between the tip of 1|1 and the distal plane of 6|6 or V|V and the overjet before and after treatment (L1 and L2). Then we calculated the obtained distance for the mandible related to the maxillary position X(X = (L2-L1)-(U2-U1)) and analyzed treating time and mandibular retreating speed in the four groups. RESULTS: The obtained distance for the mandible related to the maxillary position in C1, C2, C3 and C4 groups were 3.27 +/- 0.99 mm, 4.62 +/- 1.33 mm, 4.43 +/- 1.28 mm and 2.63 +/- 0.92 mm respectively, and the treating time in four groups were 8.92 +/- 2.66 months, 10.47 +/- 2.21 months, 13.07 +/- 2.00 months, 20.50 +/- 3.96 months respectively. The retreating speed of the mandible related to the maxillary position in the four groups were 0.37 mm/month, 0.44 mm/month, 0.34 mm/month and 0.13 mm/month respectively. The effects of the treatment in C1, C2 and C3 groups (3-11 years old) were remarkable, especially in C1 group (3-5 years old). CONCLUSION: The effects of chincap therapy for early anterior crossbite and mandibular prognathism were remarkable, especially for the very early crossbite patients.