Treatment of ectopic eruption of permanent mandibular first molars with innovative dental appliances.

AIM: Ectopic eruption (EE) of a first permanent molar occurs during mixed dentition. However, treatment of first permanent mandibular molar EE has been seldom reported. CASE REPORT: The cases of an 8-year-old girl and a 7-year-old boy are described, whose EE first permanent mandibular molars were correctly positioned after treatment with a dental appliance comprising a lingual arch, sectional arch, crimpable hook, and power chain or a simple molar controller, respectively. Both dental appliances are technically easy to construct, require short chair time, induce little discomfort on the patient, and ensure high-level treatment efficiency.