正确估计下颌生长方向是制定治疗计划及明确预后的基本问题,作者通过观察猴子在人为造成口呼吸后出现的下颌骨变化来研究这一问题。选择16只2岁半到3岁的雄性罗猴,按照年齡、大小、颅面形态随机分为实验组和对照组。在靠近下颌骨前部下缘及接近下颌角处,两侧分别插入二枚不绣钢钉,作为测量标记。实验前为每只猴子拍摄5张头颅定位X线片,取口内印模,并于连续观察的3年间每隔3个月重复拍片及取摸。5张片子分别为头颅侧位片、左斜位片、右斜位片、正位片以及颏顶片。用硅橡胶鼻塞堵住实验组猴子的双侧鼻孔,人为造成口呼吸。然后主要通过测量头 Correct estimation of the direction of mandibular growth is a fundamental issue in the development of treatment plans and a clear prognosis. The authors investigated this issue by observing the changes in the mandible that occur after monkeys cause mouth resuscitation. Sixteen male Rhesus macaques aged 2 to 30 years old were randomly divided into experimental group and control group according to age, size and craniofacial morphology. Close to the mandibular anterior lower edge and near the mandibular angle at both sides were inserted two stainless steel nails, as a measurement marker. Before the experiment for each monkey shot 5 cranial X-ray film, take the impression of the mouth, and in the continuous observation of 3 years repeated every 3 months filming and touch. The five films were cephalometric films, left oblique films, right oblique films, anteroposterior films and chin top films respectively. Stuffed with silicone rubber plug experimental group of monkey bilateral nostrils, artificially cause mouth breathing. Then mainly through the measuring head