Trapezius muscle activity in using ordinary and ergonomically designed dentistry chairs.

摘要: Background: Most dentists complain of musculoskeletal disorders which can be caused by prolonged static posture, lack suitable rest and other physical psychological problems. Objective: We evaluated a chair with new ergonomic design incorporated forward leaning chest arm supports. Methods: The was in the laboratory during task simulation EMG analysis on 12 students subjectively assessed 30 professional using an 18-item questionnaire. activity right left trapezius muscles for male no measured while simulating common tasks like working teeth lower jaw. Results: Normalized data showed significant reduction (p<0.05) all recordings muscle. Dentists also unanimously preferred ergonomically designed chair. Conclusion: Such chairs should introduced as early possible student training before bad postural habits are acquired.