Abu Alhaija E S, Richardson A
Division of Orthodontics, Queen's University of Belfast, UK.
Eur J Orthod. 1999 Jun;21(3):291-8. doi: 10.1093/ejo/21.3.291.
The short- and long-term effects of the chincap used in combination with a removable appliance to procline upper incisors were analysed cephalometrically in 23 patients with Class III malocclusions. The overall changes were compared with growth changes in a closely matched control sample of untreated Class III patients. There was no evidence that the chincap retarded growth of the mandible. During treatment, there was an increase in mandibular length and facial height. The lower incisors retroclined and the upper incisors proclined. The incisor relationship was corrected. Soft tissue changes included an increase in nasolabial angle and improvement in soft-tissue profile, including the nose. Skeletal post-treatment changes included further mandibular growth associated with an increase in angle SNB and Wits measurement. Facial height also increased significantly. The Class I overjet was maintained, although slightly diminished. The soft tissue nose, upper and lower lip, and chin moved anteriorly, and the nasal tip and chin moved inferiorly. At the end of the study period there were no significant skeletal or soft tissue differences between the treated and control groups. The only significant contrasts were in the overjet and the overbite. Chincap therapy combined with an upper removable appliance to procline the upper incisors is effective in producing long-term correction of the incisor relationship by retroclination of lower incisors, proclination of upper incisors, and redirection of mandibular growth in a downward direction. The direction of growth at the chin is maintained subsequent to treatment, as are the changes in incisor inclination, although in diminished form. There are corresponding improvements in the soft tissue profile.
对23例III类错牙合患者进行了头影测量分析，以研究颏兜联合可摘矫治器使上前牙前倾的短期和长期效果。将总体变化与未经治疗的III类患者的匹配对照样本的生长变化进行比较。没有证据表明颏兜会阻碍下颌骨的生长。治疗期间，下颌长度和面部高度增加。下前牙舌倾，上前牙唇倾。前牙关系得到矫正。软组织变化包括鼻唇角增加和软组织侧貌改善，包括鼻子。治疗后的骨骼变化包括与SNB角和Wits测量值增加相关的下颌骨进一步生长。面部高度也显著增加。I类覆盖得以维持，尽管略有减小。软组织的鼻子、上唇和下唇以及下巴向前移动，鼻尖和下巴向下移动。在研究期末，治疗组和对照组之间在骨骼或软组织方面没有显著差异。唯一显著的对比在于覆盖和覆牙合。颏兜治疗联合上颌可摘矫治器使上前牙前倾，通过下前牙舌倾、上前牙唇倾以及下颌骨生长方向向下改变，有效地实现了前牙关系的长期矫正。治疗后颏部的生长方向得以维持，前牙倾斜度的变化也得以维持，尽管程度有所减轻。软组织侧貌也有相应改善。
