Orthodontic correction of a skeletal Class III malocclusion with impacted maxillary second molars and amelogenesis imperfecta

This article describes the orthodontic treatment of a 17-year-old female patient having a skeletal Class III malocclusion with impacted maxillary second molars and amelogenesis imperfecta. We simplified the treatment mechanics of orthodontic preparation for orthognathic surgery by starting the traction of impacted teeth after the operation, and we were able to operate on schedule. The present case involved amelogenesis imperfecta of hypoplastic enamel. However, we were able to finish orthodontic treatment without causing dental enamel damage such as demineralization, white spot lesion and cracks when we removed the edgewise appliances. A good occlusion and facial esthetics were achieved, and these results have been maintained for three years after completion of the active treatment.