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Prognathism is an extension or bulging out (protrusion) of the lower jaw (mandible). It occurs when the teeth are not properly aligned due to the shape of the face bones.
Prognathism may cause malocclusion (misalignment of the biting surfaces of the upper and lower teeth). It can give a people an angry, or fighter's, appearance. Prognathism may be a symptom of other syndromes or conditions.
An extended (protruding) jaw can be part of a person's normal face shape that is present at birth.
It can also be caused by inherited conditions, such as Crouzon syndrome or basal cell nevus syndrome.
A dentist or orthodontist may be able to about treat abnormal alignment of the jaw and teeth. Your primary health care provider should also be involved to check for underlying medical disorders that can be associated with prognathism.
Call a health care provider if:
The health care provider will perform a physical examination and ask questions regarding your medical history. Questions may include:
Diagnostic tests may include:
This condition may be treated with surgery. An oral surgeon, plastic facial surgeon, or ENT specialist may perform this surgery.
Taub DI, Jacobs JMS, Jacobs JS. Anthropometry, cephalometry, and orthognathic surgery. In: Neligan PC, ed. Plastic Surgery. 3rd ed. Philadelphia, PA: Saunders Elsevier; 2013:chap 16.
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