Incidence of two root canals in human mandibular incisor teeth.
D003786:Dental Pulp Cavity / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D006801:Humans; D007180:Incisor / Q000033:anatomy & histology*; D008334:Mandible; D011861:Radiography, Dental; D013223:Statistics as Topic