Abnormal dental morphology Double tooth 2011-03-11T02:13:26Z HP:0011089 Fusion of two adjacent teeth. The fusion can be complete or be limited to the crown or the root. Typically, incisors and canines form double teeth. Double teeth are more common in the deciduous dentition and rare in the permanent dentition. Double teeth encompasses fusion, concrescence, and gemination of teeth, which some authors describe with the twinning. UMLS:C0016873 Conjoined teeth Twinning tooth SNOMEDCT_US:1744008 Double tooth Teeth, double