Hoffer F L, Walters R D
Angle Orthod. 1975 Oct;45(4):282-90. doi: 10.1043/0003-3219(1975)045<0282:ACITFO>2.0.CO;2.
The classical effects of lateral orthopedic stress on the midpalatal suture were confirmed in this study conducted on ten female Macaca mulatta monkeys in the mixed dentitional period. The suture was opened with consequent expansion of the maxillary arch, of the intranasal space, and of the palatal vault. There was marked buccal displacement of the upper posterior teeth together with a definite broadening of the entire midface. Modest relapse of maxillary expansion and of palatal depth occurred when retention was terminated after four months. Normal angulation of the upper first molars at the end of the experimental period is indicative of a predominantly translatory expansion of the arch or of a rapid restoration of normal tooth alignment and inclination. Subsidiary expansion of the mandibular arch and reclosure of the midpalatal suture also occurred. Of particular importance to this study was confirmation of changes in the bony configuration of the midface manifested by prominence of the canine eminence and the general pug-nosed appearance of treated animals althrough this could not be attributed to retrusion of the premaxilla.
在这项对10只处于混合牙列期的雌性恒河猴进行的研究中，证实了外侧正畸力对腭中缝的经典作用。腭中缝打开，随之上颌牙弓、鼻内空间和腭穹窿扩张。上颌后牙明显颊向移位，整个中面部明显变宽。在四个月后终止保持时，上颌扩张和腭深度出现了一定程度的复发。实验期结束时上颌第一磨牙的正常角度表明牙弓主要是平移性扩张，或者牙齿排列和倾斜度迅速恢复正常。下颌牙弓也出现了辅助性扩张，腭中缝重新闭合。对本研究特别重要的是，证实了中面部骨结构的变化，表现为犬齿隆突突出以及受试动物普遍的塌鼻外观，尽管这不能归因于上颌前部的后缩。
