上颌骨内横位埋伏阻生尖牙的外科-正畸治疗

目的：探讨上颌骨内横位埋伏阻生尖牙的诊断、治疗方法。方法：用螺旋CT定位上颌骨内横位埋伏阻生尖牙的位置及与相邻侧切牙根间的关系。用直丝弓矫治器进行间隙预备，外科翻辩暴露埋伏尖牙的牙冠，粘贴舌侧扣，用改良Nance弓或带垂直外展曲的不锈钢方丝作牵引装置，将尖牙牙冠向外、向后牵引绕过相邻侧切牙根的阻挡，对5例6颗上颌埋伏阻生尖牙进行正畸牵引导萌。结果：6颗埋伏尖牙均萌出后排齐，牙髓和牙周情况良好。结论：根据螺旋CT诊断，采用外科．正畸方法及特殊的牵引装置可有效地矫治横位埋伏上颌尖牙。

The surgery-orthodontic treatment of horizontal impacted maxillary canines

Objective: To explore the diagnosis and treatment on horizontal impacted maxillary canines. Methods:The position of horizontal impacted canines was orienta ted with helical CT,to analyse the relationship between the impacted canines and the adja cent lateral incisor roots.The spaces with straight wire arch applian ces to expose the crowns of impacted canines with full flap closure surgical appr oach and bond firmly lingual knot button. Modifing Nance arch or stainless s t eel wire(with outset or vertical loop in canine area)was used as traction d evic e. The impacted canines were drawn outwards and backwards in order to wind the b arrier of the adjacent lateral incisor's roots. Six horizontal impacted maxillar y canines were treated. Results:Six impacted maxillary canines were treated to normal p osition. Their pulp and periodontal attachment were normal. Conclusion:Horizontal impacted maxillary canines can be effecti vely treated by sugery with orthodontical methods used special traction dev ices.