Severe root resorption associated with ectopically erupting teeth: a case report.

A 12-year-old Japanese boy had ectopic eruption of the permanent maxillary canines and permanent mandibular second molars accompanied by root resorption of the adjacent permanent teeth. The permanent maxillary lateral incisors were extracted, and fenestration traction treatment was performed for the ectopically erupting canines. They were moved to the occlusal position orthodontically using a lingual arch appliance and sectional arch wire. The mandibular second molars were moved distally with an appliance designed to minimize the load on the teeth. The treatment is discussed with consideration of the diagnosis and appliances.