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 person 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.
It may develop over time in children or adults as the result of conditions such as gigantism or acromegaly.
A dentist or orthodontist may be able to 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 provider if:
The provider will perform a physical exam 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.
Reviewed By: Ilona Fotek, DMD, MS, Dental Healing Arts, Jupiter, FL. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.