_:vb50937180 "url:http://en.wikipedia.org/wiki/Hypodontia"^^ . _:vb50937180 . _:vb50937180 . _:vb50937180 . _:vb50937180 . _:vb50937180 . _:vb50937180 "A tooth disease characterized by failure to develop on or more missing teeth."^^ .