ergonomics chapter 25 Flashcards
MSDS
musculoskeletal disorders
three interrelated factors that contribute to increased risk of job-related injury
posture, repetition, force
what posture affects
affects the ability of DA to reach, hold and use the equipment.
Influences how long DA can perform tasks
Can get worse
how to sit
establish a neutral position by sitting upright with your weight evenly distributed.
The feet should be flat on the ground, the back should be leaning against the chair, hips should lean forward.
extreme stretching of muscles and tendons causes
strains
sudden twist or wrenching of a joint with stretching or tearing of ligaments is
sprains
frequently used items such as air water syringe, handpiece, saliva ejector, and high volume oral evacuator so they’re within
normal horizontal reach
keep operatory light within safe
maximum vertical reach
other supplies used less frequently should be placed within
maximum horizontal reach
repetitive motion, over flexing and extension of the wrist, can significantly increase the risk of
cumulative trauma disorders (CTD)
term carpal tunnel refers to
an anatomic area of the hand/wrist
The first symptom of cts are
painful tingling in one or both hands. Decreased ability and power to squeeze objects or make a tight fist
because of cts which muscle weakens
thenar muscle (located at the base of the thumb
what position is believed to be the most important
resting hands are frequently believed to be the most important factors in preventing CTS
To give your eyes some rest what should you do
lookup from the task and focus your eyes at a distance for about 20 seconds
back exercise
sit on the chair and allow arms and head to fall between the knees
neck exercise
head rotations for neck stiffness, right/left, forward/backward
shoulder exercise
shoulder shrugging, pull shoulders up towards the ears, roll them backward then forward
ergonomics is the
adaptation of the work environment to the human body
the goal of ergonomics is to
help people stay healthy, perform work more effectively
most common risk factor contributing to musculoskeletal disorders
poor posture
a reach that is created by the sweep of the forearm with the upper arm held at the side is
normal horizontal reach
what type of gloves are most likely to aggravate carpal tunnel syndrome
ambidextrous gloves
what is one of the most important factors in preventing carpal tunnel syndrome
resting the hands
conditions of the muscles and skeleton such as neck and shoulder pain, back pain, and carpal tunnel syndrome
musculoskeletal disorder
is the fleshy elevation of the palm side of the hand
thenar eminence
repetition and force
repetitive motion, overflowing, and extension of the wrist can increase the risk of CTD
how cts appears
with improper motions, the tendons swell and exert pressure on the median nerve
