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A child with Treacher Collins syndrome showing microtia and retrognathism awaiting corrective surgery
Classification and external resources
Specialty gastroenterology
ICD-10 K07.1
ICD-9-CM 524.10
DiseasesDB 34031
MeSH D012182

Retrognathia (or retrognathism) is a type of malocclusion which refers to an abnormal posterior positioning of the maxilla[1] or mandible,[2] particularly the mandible, relative to the facial skeleton and soft tissues.[3]

A retrognathic mandible is commonly referred to as an overbite, though this terminology is not used medically.

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