Prevalence and characteristics of non-syndromic distomolars: a retrospective study

Distomolars are defined as the supernumerary teeth that erupt distal to the third molar. The aim of the present study was to evaluate the prevalence of distomolars in permanent dentition in a non-syndromic Turkish subpopulation.

A total of 10 111 panoramic radiographs of patients aged 18 years and over, who had no systemic diseases and syndromes, and who had not undergone any extractions in the third molar area, were examined to determine the presence, location, shape, and laterality of distomolars. The patients' age and sex were noted.

The results showed that distomolars were observed in 0.26% of the investigated population. Distomolars were seen in 0.29% of male patients and in 0.23% of female patients. In total, 30 distomolars were observed in 26 patients. Maxillary distomolars were more frequently encountered than mandibular teeth. Bilateral distomolars were found in three male patients. Of the 30 distomolars, 25 were impacted and five were erupted.

Although the frequency of distomolars is low, early diagnosis and treatment are important to minimize or prevent complications, such as delayed eruption, tooth displacement, crowding, root resorption of the adjacent tooth, and cystic formations.