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牙列拥挤是常见的错(牙合)畸形;造成牙列拥挤的机制是牙量大于骨量,而前牙拥挤比后牙拥挤更常见,作者对85例安氏I类错(牙合)畸形患者,用顺序拔牙法进行预防性矫治取得了满意的效果。方法为:①拍全颌曲面断层片,推断全部恒牙及牙胚均存在。②在恒侧切牙已萌出,恒尖牙和第一双尖牙根已形成1/3时,拔除乳尖牙为恒侧切牙的萌出提供间隙。③第一双尖牙在牙槽骨内即将萌出拔除第一乳磨牙,在第一双尖牙刚萌出并出现于口腔时将其拔除。结果85例患者中有59例未用任何矫治器,4例用活动矫治器稍微局整后即很满意,22例顺序拔牙后用Begg固定矫治器,全部病例均矫治良好,达到了矫治目的,全部下颌牙齿漂移后自行调整,未用任何矫治器,即达到了矫治的目的。
Crowding of the dentition is a common malocclusion; the mechanism that causes the crowding of the dentition is that the amount of teeth is larger than the amount of bone, while the crowding of the anterior teeth is more common than the posterior crowding. The author of 85 cases of Class I malocclusion (occlusion) Deformity patients, with the order of extraction method for preventive treatment achieved satisfactory results. Methods: ① shoot all jaw curved surface slice, infer all permanent teeth and tooth germs are present. ② In the constant side of the incisors have erupted, the canine and the first bicuspid root has formed 1/3, the extraction of canine decalcification for constant eruption of the incisors to provide clearance. ③ the first bicuspid tooth in the alveolar bone is about to erupt the first deciduous molar, the first pair of canines had just erupted and appeared in the mouth when the removal. Results Of the 85 patients, 59 patients did not use any appliance and 4 patients were satisfied with active appliances after partial extremity operation. Twenty-two patients were treated with Begg appliance after tooth extraction, and all the patients were cured well to achieve the purpose of treatment. All mandibular teeth drift to adjust themselves, without any appliance, that is to achieve the purpose of orthodontic treatment.