Ciarlantini Roberto, Melsen Birte
Department of Orthodontics, University of Aarhus, Aarhus, Denmark.
Am J Orthod Dentofacial Orthop. 2007 Sep;132(3):385-94. doi: 10.1016/j.ajodo.2007.04.011.
Among dentitional anomalies, tooth transposition is considered the most difficult to manage clinically. Uncorrected, the results are often both functionally and esthetically unsatisfactory. Acceptance of the malpositions and alignment is nevertheless the predominating treatment strategy in case reports in the literature. Our aims in this article were to present a literature survey on the prevalence and the etiology and to discuss the cost-benefit considerations influencing the treatment strategy and the decision whether to accept or correct. An additional aim was to discuss the treatment of 12 patients who had maxillary transpositions--8 with maxillary canine and first premolar, and 4 with maxillary canine and lateral incisor--9 of whom were corrected within normal treatment times. A segmented appliance allowed for the differentiation between active and passive units of the appliance and for the delivery of a specific and necessary line of action of the force. Two patients were treated with extractions, 1 because of periodontal problems and the other because of crowding; in 1 patient, the transposition was accepted because the alignment had been started by another dentist.
在牙列异常中，牙齿易位被认为是临床上最难处理的。若不进行矫正，其结果在功能和美观方面往往都不尽人意。然而，在文献中的病例报告里，接受错位和排列不齐仍是主要的治疗策略。本文的目的是对患病率和病因进行文献综述，并讨论影响治疗策略以及决定接受或矫正的成本效益考量因素。另一个目的是讨论12例上颌牙齿易位患者的治疗情况——8例为上颌尖牙与第一前磨牙易位，4例为上颌尖牙与侧切牙易位——其中9例在正常治疗时间内得到了矫正。一种分段矫治器能够区分矫治器的主动和被动单元，并施加特定且必要的作用力。2例患者接受了拔牙治疗，1例是因为牙周问题，另1例是因为牙列拥挤；有1例患者的易位情况被接受，因为另一位牙医已经开始进行排列治疗。
