Retrognathism

{{Short description|Abnormal backwards positioning of the jaw relative to the rest of the face}}

{{distinguish|Micrognathism}}

{{Infobox medical condition (new)

| name = Retrognathism

| image = File:TeacherCollinSide.jpg

| caption = A child with Treacher Collins syndrome showing microtia and retrognathism awaiting corrective surgery

| pronounce =

| field = Medical genetics, dentistry

| synonyms = Retrognathism

| symptoms =

| complications =

| onset =

| duration =

| types =

| causes =

| risks =

| diagnosis =

| differential =

| prevention =

| treatment =

| medication =

| prognosis =

| frequency =

| deaths =

}}

Retrognathia is a type of malocclusion which refers to an abnormal posterior positioning of the maxilla{{cite journal |vauthors=Chang JZ, Liu PH, Chen YJ, etal |title=Thin-plate spline analysis of the effects of face mask treatment in children with maxillary retrognathism |journal=J. Formos. Med. Assoc. |volume=105 |issue=2 |pages=147–54 |date=February 2006 |pmid=16477335 |doi=10.1016/S0929-6646(09)60336-3 |doi-access=free }} or mandible,{{cite journal |vauthors=van Es RJ, Wittebol-Post D, Beemer FA |title=Oculodentodigital dysplasia with mandibular retrognathism and absence of syndactyly: a case report with a novel mutation in the connexin 43 gene |journal=Int J Oral Maxillofac Surg |volume=36 |issue=9 |pages=858–60 |date=September 2007 |pmid=17509830 |doi=10.1016/j.ijom.2007.03.004 }} particularly the mandible, relative to the facial skeleton and soft tissues.{{DorlandsDict|seven/000092657|Retrognathism}}

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