1) Retrognathia 1) Retrusion of the mandible 
Retrognathia (or retrognathism) is a type of malocclusion which refers to an abnormal posterior positioning of the maxilla or mandible, particularly the mandible, relative to the facial skeleton and soft tissues. A retrognathic mandible is commonly referred to as an overbite, though this terminology is not used medically. ...
Retrusion of the mandible. ... (12 Dec 1998) ... 
(ret″ro-nath´iz-әm) retrusion of the mandible. Called also retrognathia. adj., retrognath´ic., adj.
Type: Term Pronunciation: ret′rō-nath′izm Definitions: 1. A condition of facial disharmony in which one or both jaws are posterior to normal in their craniofacial relationships; usually used in reference to the mandible.