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上颌正中孤立中切牙(solitary median maxillary central incisor,SMMCI)是一种比较罕见的牙畸形,是指在上颌牙弓中仅发育并萌出1颗中切牙且该中切牙位于牙弓的正中,形态左右对称,大小与正常中切牙相似,在乳、恒牙列均可见。SMMCI可单独发生,也可伴发其他先天性中线结构畸形,或与一些系统性疾病同时发生。其中,与前脑无裂畸形(holoprosencephaly,HPE)关系最为密切。本文报告1例伴有其他中线结构缺陷的上颌正中孤立中切牙病例。并对相关问题进行讨论。
Solitary median maxillary central incisor (SMMCI) is a relatively rare dental malformation, which refers to the development and eruption of only one central incisor in the maxillary dental arch, which is located in the middle of the dental arch , The shape of bilateral symmetry, the size of the normal incisors similar to the milk, permanent dentition are visible. SMMCI can occur alone, can also be associated with other congenital malformations of the midline structure, or with some systemic diseases. Among them, the most closely related to the holoprosencephaly (HPE). This article reports one case of median central incisor with other median defects. And discuss the related issues.