Neo Hui-Lin Luisa, Watt Eileen N, Acharya Priti
Orthodontic Department, Eastman Dental Institute, London, UK.
J Orthod. 2019 Dec;46(4):343-348. doi: 10.1177/1465312519875973. Epub 2019 Sep 23.
Molar-incisor malformation (MIM) is a dental anomaly that has recently been presented in the literature. It features morphological root abnormalities affecting the permanent first molars, resulting in narrow, shortened or almost completely absent roots in patients who interestingly still present with clinically normal crowns. In some cases, this condition also involves the roots of the deciduous second molars in a similar manner and the maxillary central incisors may exhibit notching around the cervical region of the clinical crown. Root dysplasia of the permanent first molars compromises the long-term survival of these teeth and, in itself, presents a challenge when attempting to undertake any orthodontic treatment. This case report describes an incidental finding of a patient presenting with similar features to that of MIM, discusses the features and clinical implications of this newly discovered condition, and highlights the importance of undertaking a comprehensive radiological investigation before treatment.
磨牙-切牙畸形（MIM）是一种最近在文献中有所报道的牙齿异常情况。其特征是影响恒牙第一磨牙的形态学牙根异常，导致患者牙根变窄、缩短或几乎完全缺失，而有趣的是这些患者的临床牙冠仍表现正常。在某些情况下，这种情况还会以类似方式累及乳牙第二磨牙的牙根，并且上颌中切牙在临床牙冠的颈部区域可能会出现切迹。恒牙第一磨牙的牙根发育异常会影响这些牙齿的长期存活，并且在尝试进行任何正畸治疗时，其本身就构成了一项挑战。本病例报告描述了一名具有与MIM相似特征患者的偶然发现，讨论了这种新发现病症的特征和临床意义，并强调了在治疗前进行全面影像学检查的重要性。
