Abstract: Objective To evaluate the clinical effect of muscular position splint on anterior disk displacement with reduction,to analyze the result of the treatment,and to investigate the factors that influence the effect of the treatment.Methods 89 patients (23 men and 66 women),who were diagnosed as anterior disk displacement with reduction by clinical and MRI examination participated in this study.All patients received muscular position splint treatment,and the total course of treatment was 3～6 months .We recorded the condition of recovery 1 week,4 weeks and 12 weeks after treatment.When the treatment was finished,the patients were divided into two different groups according to age and medical history,and the date was retrospectively analyzed.Results The patients who were younger than 17 and those whose clicking time was shorter than two weeks showed better outcome than others,and the recovery rates were respectively 88.9% and 90.9%.The results were analyzed by chisquare test,which showed in age group the χ2=41.53(P<0.05) while in history group χ2=23.94(P<0.05),and there were statistically significant differences in two groups.Conclusions Muscular position splint is more effective in the treatment of anterior disk displacement with reduction in younger patients whose clicking time is shorter than two weeks,thus occlusal splint should be recommended at the early stage of the temporomandibular joint clicking for the possibility of this condition to be cured as we expect.

Key words: Key words: Temporomandibular joint , anterior disk displacement with reduction, Muscular position splint