Mandibular fourth molars.
D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008963:Molar / Q000002:abnormalities* / Q000000981:diagnostic imaging; D011859:Radiography; D014095:Tooth, Impacted; D014096:Tooth, Supernumerary / Q000000981:diagnostic imaging*