Transmigration of impacted mandibular canine to opposite side

Case ReportA boy visited a local dentist for the treatment of other teeth at the age of 12 years, and the same dentist at the age of 17 years and 6 months. Comparison of panoramic X-rays taken at the age of 17 years and 12 years revealed that the impacted left mandibular canine had transmigrated to the right side, and so the patient was referred to our department for a more detailed examination. The panoramic X-ray obtained at the age of 12 years showed that the left mandibular canine was horizontally impacted almost in the center of the mandibular bone, with its tooth crown oriented toward the right. The panoramic X-ray taken at the age of 17 years and 6 months showed that the apex of the impacted left mandibular canine had horizontally migrated to the tooth root apical area of the right mandibular first molar.ConclusionTransmigration of the mandibular canine across the mandible midline is an uncommon phenomenon. When delayed eruption of primary teeth occurs, it is necessary to confirm the position of permanent tooth germs using panoramic X-rays.