Evaluation of acupuncture for pain control after oral surgery - A placebo-controlled trial

Background: Acupuncture is increasingly being used by the general populatio n and investigated by conventional medicine; however, studies of its effect s on pain still lack adequate control procedures. Objectives: To evaluate the (1) efficacy of Chinese acupuncture in treating postoperative oral surgery pain, (2) validity of a placebo-controlled proc edure, and (3) effects of psychological factors on outcomes. Design: Randomized, double-blind, placebo-controlled trial. Setting: Dental School Outpatient Clinic, University of Maryland at Baltimo re. Participants: Thirty-nine healthy subjects, aged 18 to 40 years, assigned t o treatment (n = 19) and control (n = 20) groups. Main Outcome Measures: Patients' self-reports of time until moderate pain, time until medication use, total pain relief, pain half gone, and total pai n medication consumption. Results: Mean pain-free postoperative time was significantly longer in the acupuncture group (172.9 minutes) than in the placebo group (93.8 minutes) (P = .01), as was time until moderate pain (P = .008). Mean number of minut es before requesting pain rescue medication was significantly longer in the treatment group (242.1 minutes) than in the placebo group (166.2 minutes) (P = .01), as was time until medication use (P = .01). Average pain medicat ion consumption was significantly less in the treatment group (1.1 tablets) than in the placebo group (1.65 tablets) (P = .05). There were no signific ant between-groups differences on total-pain-relief scores or pain-half-gon e scores (P > .05). Nearly half or more of all patients were uncertain of o r incorrect about their group assignment. Outcomes were not associated with psychological factors in multivariate models. Conclusions: Acupuncture is superior to the placebo in preventing postopera tive dental pain; noninsertion placebo procedure is valid as a control.