A two-phase treatment comprising functional orthopedic therapy and fixed orthodontic therapy is often proposed for pubescent patients with Class II division 1 malocclusion. Mandibular retrognathism is a more common underlying cause of Class II skeletal discrepancy than the maxillary prognathism. In such cases, an activator is a widely used functional orthopedic appliances to enhance the mandibular growth. After resolving the sagittal problem by using the functional appliances, the biomechanical considerations of the anchorage requirement could be simplified in the second phase fixed appliance therapy, and the total treatment duration could be shorter. This case report describes a two-phase orthodontic treatment of an 11-year-old boy with Class II division 1 malocclusion which characterized as mandibular retrognathism. The patient was corrected with an activator to improve the skeletal relation. Subsequently, fixed orthodontic appliances were used for full mouth dental alignment and occlusion. After treatment, the patient exhibited Class I molar relationships, proper occlusion, and harmonized facial esthetics.
Hsieh, Wen-Hui; Chen, Hui-I; and Chan, Chin-Hsiang
"Two-Phase Orthodontic Treatment in Class II Division 1 Malocclusion,"
Taiwanese Journal of Orthodontics: Vol. 30:
1, Article 3.
Available at: https://www.tjo.org.tw/tjo/vol30/iss1/3