相某，男，１５岁。恒牙，磨牙中性关系，前牙覆、覆盖正常，１２之间存在３．５ｍｍ间隙，１未萌出。ｘ光片示：１低位阻生，牙体形态正常，冠根无成角畸形，根尖孔发育基本完成（图略）。一、临床矫治过程上颌用方丝弓细丝弓矫治技术开拓１２间隙，待间隙足够大时，... Phase a, male, 15 years old. Permanent teeth 磨, molars neutral, anterior teeth covered 正, covering normal, there is 3.5mm gap between 12, 1 did not erupt. X-ray showed: 1 low obstruction, normal tooth shape, crown no angular deformity, apical foramen basically completed (Figure omitted). First, the clinical process of correction of the maxillary arch wire arch bow technique to open up 12 gaps, until the gap is large enough, ...