ch.25 Ergonomics – Flashcards
22 test answers
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3 categories of risk factors to MSD?
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posture, force, repetition
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posture
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ability of dental assistant to reach and hold equipment. also how long posture can be hold for task. lead to - low back pain and fatigue
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neutral position
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sit up right while weight is evenly distribute. legs separated and feet flat. back shoulder press against back tilt hip forward to rotate
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strains
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extreme stretching of muscles and ligaments
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sprains
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usually involve a sudden twist or wrenching of a joint with stretching or tearing of ligaments.
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optimal dental assistant position
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1. position head up right 2.back straight and support with back rest 3.keep thigh parallel to floor 4. sit at patient shoulder with knees even with patients headrest 5.rest feet on chair or foot rest. 6. eye level 6 inch from dentist level
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normal horizontal reach
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frequently use of items
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maximum vertical reach
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operatory light
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maximum horizontal reach
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other supplies less frequently
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cumulative trauma disorders CTDs
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repetitive motion, overflexion, and extension of wrist breaks and alternating difficult procedures can reduce risk injury
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carpal tunnel syndrome
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8 bones in wrist that become a tunnel where tendons and median nerve passes -cause swelling and inflammation -symptoms- pain and tingling in hand often at night, maybe loss of strength
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ambidextrous gloves
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cause excessive tension called thenar eminence (flesly elevation on the palm ) forcing hand to work against the vertical alignment of the glove form.
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muscle-strenghthening exercises
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5 hands, eyestrain,back,head,shoulder
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hand exercise
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resting the hand frequently
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eye exercise
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look up from the task and focus your eye at a distance for 20 seconds practice throughout the day
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back exercise
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relieve stresses back, neck shoulder TRY FULL BACK RELEASE head rotations
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neck exercise
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rotate tilt head right to left
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shoulder shugging
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by holding oral evacuators, instruments and telephone handsets
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