Department of Orthodontics, Centro de Investigação Ciências da Saúde, Instituto Superior de Ciências da Saúde-Norte/CESPU, Gandra, Portugal.
Am J Orthod Dentofacial Orthop. 2012 Sep;142(3):374-83. doi: 10.1016/j.ajodo.2010.10.027.
This case report describes the treatment of a 14-year-old adolescent patient who had 2 impacted maxillary central incisors with distoangular root dilacerations. He also had an impacted maxillary left canine, with the crown completely overlapping the root of the lateral incisor, and insufficient space. The general dentist referred this patient because the maxillary central incisors had still not erupted 2 years after extraction of the retained deciduous incisors. A unilateral expander with a modified vestibular arch and an attachment spring on the right side was used to correct the posterior crossbite on the right side and improve the positions of the teeth. The expansion appliance was also applied as a high anchorage device to move the central incisors and the left canine into position during the initial stages. After this phase, fixed appliances were used to redistribute the space in the anterior maxillary region to create enough space for repositioning the impacted teeth. This procedure restored the normal appearance of the maxillary arch, with good periodontal health and without evidence of root resorption, apart from the distoangular root dilacerations of the 2 maxillary central incisors.
本病例报告描述了一位 14 岁青少年患者的治疗过程,该患者有 2 颗上颌中切牙呈远中倾斜根弯曲,且左上尖牙埋伏阻生,其牙冠完全覆盖侧切牙的牙根,间隙不足。一般牙医转诊该患者是因为上颌中切牙在拔除滞留的乳牙后 2 年仍未萌出。使用单侧扩弓器,带有改良的前庭弓和右侧附件弹簧,以纠正右侧后牙反牙合,并改善牙齿位置。扩弓器也用作高支抗装置,在初始阶段移动中切牙和左侧尖牙就位。此阶段后,使用固定矫治器在前上颌区域重新分配空间,为重新定位埋伏牙创造足够的空间。该程序恢复了上颌弓的正常形态,牙周健康状况良好,无牙根吸收的证据,除了 2 颗上颌中切牙的远中倾斜根弯曲。