McCreedy Chanel, Robbins Hila, Newell Adele, Mallya Sanjay M
Section of Pediatric Dentistry, UCLA School of Dentistry, Los Angeles, Calif., USA.
private practice, New Orleans, La., USA.
J Dent Child (Chic). 2016;83(1):33-7.
Molar-incisor malformation (MIM) is a recently described dental developmental anomaly with marked manifestations in the primary second molars and permanent first molars and sometimes the permanent maxillary central incisors. To date, there are only two known manuscripts that present this anomaly. The major manifestations are severe coronal cervical constriction of the affected molars and significant under-development of one or more roots. These abnormalities may be detected during routine radiographic examination or present as altered or ectopic eruption or early exfoliation. The characteristic radiographic features are sufficient to identify this abnormality properly. The purpose of this paper is to present two cases of MIM and discuss the impact of the dental abnormalities on patient management.
磨牙-切牙畸形（MIM）是一种最近才被描述的牙齿发育异常，在乳牙第二磨牙和恒牙第一磨牙以及有时在恒牙上颌中切牙中有明显表现。迄今为止，仅有两篇已知的文献报道了这种异常。主要表现为受累磨牙严重的牙冠颈部缩窄以及一个或多个牙根的显著发育不全。这些异常可能在常规影像学检查中被发现，或者表现为萌出改变、异位萌出或早期脱落。其特征性的影像学表现足以准确识别这种异常。本文旨在介绍两例MIM病例，并讨论牙齿异常对患者治疗的影响。
