title: [Incidence of the 4th canal in the mesiobuccal root of the first upper permanent molar].
mesh_terms: D002986:Clinical Trials as Topic; D003786:Dental Pulp Cavity / Q000002:abnormalities*; D006801:Humans; D066298:In Vitro Techniques; D008437:Maxilla; D008963:Molar / Q000033:anatomy & histology*; D014092:Tooth Root
vernacular_title: Incidencia del cuarto conducto en la raíz mesiobucal del primer molar superior permanente.