RESUMO
Objective:To investigate the efficacy of tramadol hydrochloride tablets in the control of periodontal pain following ortho-dontic treatment.Methods:76 orthodontic patients were randomly assigned to I,II,III and IV groups according to the different doses of tramadol hydrochloride tablets or placebo(control).Periodontal pain was recorded and analysed by VAS,adverse reaction was ob-served.Results:The pain scores were all lower when teeth were not touching than when teeth were touching.Pain scores of experi-mental group were less than that of the control group,muff-doses are more effective than single-dose.No obvious adverse reaction was found in all group.Conclusion:Tramadol hydrochloride tablet is effective in the control of the pain following orthodontic treatment.