Abstract:

Skeletal class Ⅱ malocclusion is a common disease in adolescents and children. It can cause oral and muscular dysfunction, oral and maxillofacial development deformity, and even affect the physical and mental health of patients if it could not be corrected in time. This case report presented the early intervention of a 9-year-old boy who was in the early mixed dentition and had a severe protruding upper incisor and retrognathic mandible, as well as skeletal class Ⅱ malocclusions. After the 13-month treatment with headgear-activator, the malocclusion had been corrected, and both the front look and facial profile met the aesthetic criteria.

Key words: Orthodontic appliances, functional, Headgear-activator, Early treatment, Skeletal classⅡ malocclusion, Cephalometrics analysis