Introduction: Musculoskeletal disorders (MSD) represent one of the most common work-related health problems in laboratory prosthodontists. They are mainly caused by prolonged work in forced postures, repetitive movements and static loading. Due to the nature of the work, which requires high precision, workers are often exposed to harmful factors. Purpose: The investigation of the musculoskeletal disorders and the working postures of laboratory dental prosthetists, the analysis the exposure of the body segments to ergonomic stresses and the discomfort at work of the subjects observed. To propose measures to relieve the strain on the employees based on the results. Methods: We used the descriptive-causal method, the modified OWAS method and the CORLETT method. The OWAS method was used to record body positions during work and to assess the degree of strain on individual segments, while the CORLETT method was used to record subjectively expressed discomfort in 12 body segments in four laboratory dental prosthetists who were observed throughout the working day. Results: We found that the head was often bent over 30° at some work tasks, the upper arms were raised away from the body, and sitting was often unphysiological. Discomfort increased throughout the day, with peaks in the late afternoon. Discussion: Individual differences suggest that the work experience, the age and the individual tasks also influence the findings. The OWAS and CORLETT methods have been shown to be suitable for the detection of critical physical strains and as a basis for work environment adaptations. Conclusion: With the appropriate ergonomic adaptations, the introduction of regular active breaks, the stretching exercises and the use of assistive devices, it is possible to significantly reduce the workload and thus the prevalence of MSDs. The results offer concrete recommendations for improving the working conditions of laboratory prosthodontists.
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