IRCT2015113024199N2 IRCT 2015-12-09 Research Deputy, Iran University of Medical Sciences Participatory ergonomics interventions for dentists Investigate the effectiveness of ergonomic interventions to reduce the prevalence of musculoskeletal disorders with participatory ergonomics approach to dentists and their assistants in Milad hospital at 2015. 2015-12-01 anticipated 100 Complete https://irct.ir/trial/20488 interventional Randomization: N/A, Blinding: Not blinded, Placebo: Not used, Assignment: Single, Purpose: Prevention. N/A Diseases of the musculoskeletal system and connective tissue. The program will be conduct among dentists. Before running the program, will investigate the prevalence of musculoskeletal disorders among employees. The multifaceted intervention program consisted of five components, which will design to address all the major ergonomic risk factors identify in the healthcare environment. After the intervention to assess the effectiveness of the program, will investigate the prevalence of musculoskeletal disorders among employees. The five components are: group training on ergonomic principles and safe practices, Work and equipment modification, supervise onsite ergonomic training, regular exercise program and typing training and computer workstation evaluation and advice. Main outcome measures: Prevalence of musculoskeletal disorders. After the intervention to assess the effectiveness of the program, will investigate the prevalence of musculoskeletal disorders among employees. In fact, in this study we have a group for intervention. The program has been implemented to reduce musculoskeletal disorders in this group of employees and the prevalence of musculoskeletal disorders in this group of employees will be compared before and after the program together..