Pathologic mandibular prognathism is a potentially disfiguring, genetic disorder where the lower jaw outgrows the upper, resulting in an extended chin.
The condition is characterized by an enlarged mandible, an increased mandibular angle and arch of the circle of the sigmoid notch, and masticatory and phonetic disturbances.
Mandibular prognathism develops as a result of several factors including infant osteogenetic disturbance, mechanical factors such as malocclusion, and heredity.
The most common treatment for mandibular prognathism is a combination of orthodontics and surgery (Orthognathic surgery). The orthodontics can involve braces, removal of teeth, or a bite splint.