Pancherz H
Angle Orthod. 1979 Jan;49(1):11-20. doi: 10.1043/0003-3219(1979)049<0011:TMPAIA>2.0.CO;2.
The long-term results of activator treatment were investigated in 15 subjects with a small and 13 subject with a large pretreatment mandibular plane angle. The results of the investigation revealed the following: 1. Activator treatment resulted in a general improvement in the sagittal and vertical incisor relationship in both large and small angle cases. 2. Overjet relapse was more frequent and overbite relapse less frequent in large angle cases than in small angle cases. 3. During the period before treatment follow-up examination the frequency of patients with open bite increased in the large angle group and decreased in the small angle group. 4. The mandibular intercanine arch width was smaller and the frequency of crowding in the mandibular incisor segment was higher in the large angle group than in the small angle group. 5. A large pretreatment mandibular plane angle, per se, was not a primary factor in treatment failure. However, an unfavourable mandibular growth in combination with an atypical tongue function seemed to be the main reason for the relapse found in the large angle subjects.
对15例治疗前下颌平面角小的受试者和13例治疗前下颌平面角大的受试者进行了肌激动器治疗的长期效果研究。研究结果如下：1. 肌激动器治疗使大角度和小角度病例的矢状和垂直切牙关系总体上得到改善。2. 大角度病例的覆盖复发比小角度病例更频繁，而覆合复发比小角度病例更少。3. 在治疗随访检查前的期间，大角度组开牙合患者的频率增加，小角度组减少。4. 大角度组下颌尖牙间牙弓宽度较小，下颌切牙段拥挤的频率高于小角度组。5. 治疗前下颌平面角大本身不是治疗失败的主要因素。然而，下颌生长不良与非典型舌功能相结合似乎是大角度受试者复发的主要原因。
