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Maxillary molar transposition.

机译:上颌臼齿移位。

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摘要

To date, five types of maxillary tooth transposition are described in the international literature (canine/first premolar; canine/lateral incisor; lateral incisor/central incisor; canine/central incisor site; canine/first molar site), although the latter two are indeed extreme displacements and not true transpositions. In the present article a sixth type of transposition is recognized and described: the maxillary molar transposition (MxM3M2 and MxM4M3, respectively). Three cases of this anomaly were presented. The occurrence is extremely rare, about 0.04 percent in a sample of 7,000 orthodontic patients. Investigation of other family members (especially parents and siblings) could not substantiate an hypothesis of inheritance of this anomaly. Other possible causes (trauma, caries, tooth agenesis) were also absent in these cases.
机译:迄今为止,国际文献中描述了五种类型的上颌牙齿移位(犬/第一前磨牙;犬/侧切牙;侧切牙/中央切牙;犬/中央切牙部位;犬/第一磨牙部位),尽管后两种是确实是极端的位移而不是真正的换位。在本文中,认识并描述了第六种类型的移位:上颌臼齿移位(分别为MxM3M2和MxM4M3)。提出了此异常的三个案例。这种情况极为罕见,在7,000名正畸患者的样本中大约占0.04%。对其他家庭成员(尤其是父母和兄弟姐妹)的调查无法证实这种异常的遗传假设。在这些情况下,也没有其他可能的原因(创伤,龋齿,牙齿发育不全)。

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