Solitary median maxillary central incisor Single midline maxillary incisor Solitary median maxillary central incisor syndrome Solitary median maxillary central incisor Single median incisor HP:0001573 Single maxillary central incisor Only one upper front tooth Solitary midline maxillary central incisor The tooth differs from a normal central incisor in the symmetric formation of the crown. The tooth is present in both deciduous and permanent dentition. Solitary/single median maxillary central incisor syndrome indicates the presence of a single median maxillary central incisor together with other midline defects of development. A single maxillary central incisor not positioned in the midline indicates agenesis of the contralateral central incisor and can be differentiated furthermore by the morphology of the crown. A diagnosis of a solitary median maxillary central incisor typically requires X-ray examinations. Single median maxillary incisor HP:0006356 Single central incisor Single midline upper front tooth HP:0006315 A single maxillary central incisor positioned in the midline with morphological symmetry of the crown and bordered by lateral incisors. HP:0001568 SNOMEDCT_US:707609006 UMLS:C1840235 Single central upper incisor Abnormal number of incisors