Background and purpose:  Mesiodens are supernumerary tooth between the two central incisors. Mesiodens are usually responsible for eruption disturbances, midline diastema, crowding and finally root resorption of adjacent teeth. The aim of this study was to evaluate the prevalence of mesiodens in the panoramic images of 12-6-year-old children referred to Sari Dental School.

Methods: This cross-sectional study evaluated all radiographs of 6-12 year-old children referred to pediatric department of Sari Dental School. Radiographic examination of mesiodensis included the presence and number of mesiodensis.

Results: Mesiodensis was observed In 6 cases (0.6%) of the studied population. In each case only one mesiodens was observed and 5 of them male and only one was female. The difference in the prevalence of mesiodensis was statistically significant in both sexes (P-value =0.025) But there was no significant relationship between the prevalence of mesiodenes and age (P-value =0.444).

Conclusion: Despite the low prevalence in this population, approximately 90% mesiodens has been associated with dental problems therefore early diagnosis and treatment is recommended.