Objective: This study evaluates the effect of clinical wear on the incidence of temporomandibular disorders in patients with complete dentures. Methods: A randomized clinical trial was conducted on two groups; group 1 (30 patients) received complete upper and lower dentures with teeth made of heat-cured acrylic resin, and group 2 (29 patients) received complete upper and lower dentures with teeth fabricated of porcelain. The occurrence and clinical examination of temporomandibular disorders

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... bular disorders were evaluated using Helkimo anamnestic dysfunction index (Ai) and Helkimo clinical dysfunction index (Di), respectively. Clinical wear of denture teeth was estimated by the assessment of wear depth using the mean differences between tracing images of lingual cusps at each follow-up. The patients were followed up at 6, 12, 18 and 24 months for assessment of clinical wear and incidence of temporomandibular disorders. Results: The acrylic resin group was subjected to significantly higher wear than the porcelain group at 12, 18 and 24 months of follow-up. The incidence of temporomandibular disorders was also significantly higher in the acrylic resin group than in the porcelain group at 18 and 24 months of follow-up. Conclusion: There was higher incidence of temporomandibular disorders among patients who wore complete dentures with teeth made of acrylic resin than in patients who wore complete dentures with porcelain teeth.