ch.25 Ergonomics

adaptation of the human body to the work environment. safest, most efficient, and easiest way to work

how does ergonomics work?
design of the workplace, instruments, systems and machines being used
-training -breaks and strengthening muscles
– efficiency in performing tasks

factors of ergonomics 6
1.good practice
2.staff training design
4.instrument design
5.workplaces changes
6. balance and exercise

MSD disorders?
back pain, carpal tunnel, headache, neck pain, shoulder pain

3 categories of risk factors to MSD?
posture, force, repetition

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

neutral position
sit up right while weight is evenly distribute.
legs separated and feet flat.
back shoulder press against back
tilt hip forward to rotate

extreme stretching of muscles and ligaments

usually involve a sudden twist or wrenching of a joint with stretching or tearing of ligaments.

optimal dental assistant position
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 feet on chair or foot rest.
6. eye level 6 inch from dentist level

normal horizontal reach
frequently use of items

maximum vertical reach
operatory light

maximum horizontal reach
other supplies less frequently

cumulative trauma disorders CTDs
repetitive motion, overflexion, and extension of wrist
breaks and alternating difficult procedures can reduce risk injury

carpal tunnel syndrome
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

ambidextrous gloves
cause excessive tension called thenar eminence (flesly elevation on the palm ) forcing hand to work against the vertical alignment of the glove form.

muscle-strenghthening exercises
hands, eyestrain,back,head,shoulder

hand exercise
resting the hand frequently

eye exercise
look up from the task and focus your eye at a distance for 20 seconds
practice throughout the day

back exercise
relieve stresses back, neck shoulder
head rotations

neck exercise
rotate tilt head right to left

shoulder shugging
by holding oral evacuators, instruments and telephone handsets

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