title: Needles--25 gauge versus 27 gauge--can patients really tell?
mesh_terms: D000766:Anesthesia, Dental / Q000295:instrumentation*; D005260:Female; D006801:Humans; D008297:Male; D008340:Mandibular Nerve; D009339:Needles; D009407:Nerve Block / Q000295:instrumentation*; D010146:Pain / Q000523:psychology