Simultaneous presence of a congenitally missing premolar and supernumeraryincisor in the same jaw: Report of case

Supernumerary teeth and hypodontia can be regarded as opposite developmenta l phenomena. An eight-year-old girl presented a concomitant occurrence of a supernumerary tooth and two congenitally missing teeth. The supemumerary t ooth was found in the left maxillary incisor region, while the left second premolar in the maxilla and the left lateral incisor in the mandible were c ongenitally missing. The supernumerary tooth showed a similar color and mor phology to those of the maxillary lateral incisor, and the lateral incisor on the mesial side was diagnosed as a supernumerary tooth from dental age, eruption time, and mesiodistal crown dimension. The supernumerary incisor w as guided labially to cure an anterior crossbite, and the lateral incisor, canine, and first premolar were guided distally to compensate for the space left by the congenitally missing left second premolar.