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Intra-Osseous Migration of Second Lower Premolar-Literature Review and a Case Report

Hamed Mortazavi, Maryam Baharvand and Mahdi Niknami

Migration is a kind of eruption abnormality where a tooth is grown far from its original site of development. The incidence of mandibular second premolar impaction has been estimated to be 2.1% to 2.7%. The frequency of its intra-osseous distal migration is 0.25%.We report a case of extremely distally intra-osseous migration of mandibular second premolar which was found in routine radiography. A 28-year-old woman who attended at dental clinic to treat teeth caries was noticed to have her lower second premolar located horizontally in the homolateral mandibular angle below the inferior alveolar nerve canal on panoramic view. As the patient was asymptomatic, she was advised to take follow-up radiographs to rule out any cystic/neoplastic changes. Taking panoramic radiograph in patients with missing mandibular premolars should be considered, because in rare cases migration or transmigration of these teeth may happen.