Pomarico Luciana, Primo Laura Guimarães, Noce Denise
Veiga de Almeida University, Rio de Janeiro, Brazil.
Quintessence Int. 2006 Oct;37(9):677-83.
Ectopic eruption is a disturbance in which the tooth does not follow its usual course. Among its more important etiologic factors are macrodontism, shortened arch length, posterior positioning of the maxilla, atypical eruption angle, and genetic factors. This article reports a rare case of ectopic eruption of 4 permanent teeth, maxillary central incisors and mandibular first molars, in a child aged 7 years and 11 months, in which the treatment consisted of extracting the maxillary primary central incisors and making an orthodontic intervention on the mandibular arch. A bilateral fixed appliance containing 2 hooks with loops, 1 buccal and the other lingual, was placed on the mandibular primary first molars. The hooks were activated in a niche made of light-curing resin on the occlusal surface of the mandibular permanent molars, to bring about the distal drift of these teeth. After 6 months, complete eruption of the mandibular permanent molars occurred, and a slight displacement of the maxillary permanent central incisors toward the median line was noted. The importance of early, adequate treatment is discussed.
异位萌出是一种牙齿未按正常萌出路径萌出的异常情况。其较为重要的病因包括牙体过大、牙弓长度缩短、上颌后位、异常萌出角度以及遗传因素。本文报告了一例7岁11个月儿童4颗恒牙（上颌中切牙和下颌第一磨牙）异位萌出的罕见病例，治疗方法为拔除上颌乳中切牙并对下颌牙弓进行正畸干预。在下颌乳第一磨牙上放置双侧固定矫治器，矫治器带有2个带圈的钩，一个位于颊侧，另一个位于舌侧。在位于下颌恒磨牙咬合面由光固化树脂制成的凹槽中激活这些钩，以使这些牙齿向远中移动。6个月后，下颌恒磨牙完全萌出，同时注意到上颌恒中切牙向中线有轻微移位。文中讨论了早期充分治疗的重要性。
