Single central maxillary incisor

The maxillary central incisor is a human tooth in the front upper jaw, or maxilla, and is usually the most visible of all teeth in the mouth. It is located mesial (closer to the midline of the face) to the maxillary lateral incisor. [Source: Wikipedia ]

Synonyms
Single upper central incisor
SMMCI
Solitary median maxillary central incisor syndrome
OrphaNet reference
Solitary median maxillary central incisor syndrome 
May Cause
Dental defect
Single upper central incisor
SMMCI
Solitary median maxillary central incisor syndrome