Abstract
A true primary supernumerary tooth was found in a girl 18 months old.
1. The occurrence in the mandibular incisal region as the site was rare.
2. Similarity in the degree of radiopacity was suggested to be an important criterion in making the diagnosis as a primary supernumerary tooth.
3. On the basis of intraoral findings, radiological findings, and analysis of the plaster cast, the primary central incisor on the mesial side was concluded to be the primary supernumerary tooth.
4. A decision was made to make a follow-up observation for handling the tooth. It was also decided to give at each regular examination oral hygiene guidance and denture guidance.
