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A form of selective tooth agenesis, a common anomaly characterized by the congenital absence of one or more teeth. Selective tooth agenesis without associated systemic disorders has sometimes been divided into 2 types: oligodontia, defined as agenesis of 6 or more permanent teeth, and hypodontia, defined as agenesis of less than 6 teeth. The number in both cases does not include absence of third molars (wisdom teeth). STHAG1 can be associated with orofacial cleft in some patients.




Absence of second premolars and third molars
Familial tooth agenesis
Hypodontia/oligodontia 1
Hypodontia/oligodontia with orofacial cleft
Selective tooth agenesis 1
Selective tooth agenesis with orofacial cleft