title: A positioning device for the edentulous mandible in extraoral radiography.
mesh_terms: D002508:Cephalometry / Q000295:instrumentation*; D006801:Humans; D007575:Jaw, Edentulous / Q000000981:diagnostic imaging*; D008334:Mandible / Q000000981:diagnostic imaging; D011861:Radiography, Dental / Q000295:instrumentation