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Terms in this set (42)
Correct spelling for a pair
1 american inch = mm? iron? oz?
(use 1/16 = 1.6mm = 3 iron = 4oz rule to extrapolate)
What is the international standard for thickness of elastometric material?
the IRON... aka SYNTHETIC RUBBER thickness
What is the Oz (ounce) referring to in orthoses?
THICKNESS OF LEATHER
(most common leather used is shoulder leather 1/8th thick)
Apothecary Oz = how many grams? how many drams?
Avoirdupois Oz = how many grams?
1 - What is the European standard for linear length?
2 - What is this significance in relation to the foot?
1 - meter (~40 inches)
2 - average length of the human stride
What does the Durometric Scale measure?
scale of 0 - 100 ... 100 is hardest, 0 softest
Dr. Scholl: Where is he from?
What are the durometer of his products? What is a potential issue of this?
His products are 9 durometer... WAY TOO SOFT... NO SUPPORT... USELESS
What is poron made of?
Who/Where was it made?
What TYPE of poron do we use and what is its durometer?
1 - polyurethane foam
2 - Rodger in Woodstock, CT
3 - Medical Grade Poron = 20 durometer
Human soft tissue is ___________ durometer?
If a material is less than this durometer what does it do... support? or does it cushion?
it will cushion! because it is softer
What is it made of?
Usual thickness is?
1 - wool + snythetic cotton
2 - 1/8 or 1/4th inch
Chiropodist is synonymous with what profession?
How many durometer options are there?
What color + durometer is each option?
1 - there are THREE options!
1) #1 = MEDIUM / PINK / 20 durometer
2) #2 = FIRM / WHITE / 35 durometer
3) #3 = RIGHT / BLACK / 69 durometer
Human scar tissue is _________ durometer?
Molecular weight bearing
What is the correlation between HEAVY/LIGHT and SOFTNESS/HARDNESS?
THERE IS NO CORRELATION!!!
Softness and hardness is on the durometer scale... heavy/light IS NOT
How is cowhide used?
If split, what product is created?
Do we use natural leather any longer?
Define Lamination in Oz and Inches... what is this measurement used for?
As a thin pliable cover of 2-3oz
If split = SUEDE
No, we use synthetic leather now - cheaper
8oz / 1/8th inch ... used to make leather laminate orthoses... can stack laminations on top of each other to make different thickness!
Pigskin... describe its tensile strength (high or low)
HIGH tensile strength... little deformation under high tensile loads
Deerskin... describe durometer/tensile strength/what is it used for?
low durometer / high tensile strength / it is used as an upper in patients WITH VERY SENSITIVE FEET (diabetic neuroapathy)
Natural latex is made from?
Do we use it any more?
PARA RUBBER or GUM RUBBER from trees
NO! too expensive! better alternatives!
What material does vulcanization apply to?
Who did it? How is it done? What is vulcanized rubber a precursor for?
It applies to rubber!
Goodyear did it ... it is done by mixing latex + sulfur where you vary durometer by heat .. it is a precursor for PLASTICS
What is rubber butter / latex fillers?
When rubber/latex is mixed with other materials like cork or leather
Where does it come from?
Cork orthoses is called?
What is a significant property of cork?
What is Thermocork? (hint: its combined with another material)
Old orthoses used to combine cork with?
It comes from OAK TREES
cork is THERMOFORMABLE (mold with heat)
CORK + LATEX SHEETING
They used to combine cork with a steel frame... people's feet/arches would mold to the orthoses!
What chemical structure are they?
Are they adjustable / moldable to heat? What is the name for this?
Are some plastics not adjustable to heat?
They are MONOMERS
Yes, some are! These are called THERMOMOLDING/THERMOFOLDING... heat moldable after setting... can reheat and reset as much as desired
Yes, these are called thermoSETTING resins... not heat moldable after setting
Open cell foams _______ heat?
DISSIPATE... OPEN to evaporation!
Closed cell foams _____ heat?
Are they formable to heat?
What is their chemical composition?
How many types?
What country makes these?
Yes, formable to heat
Polyethylene Double Carbon
1) Ortholen ultra high density
2) Subortholen high density
GERMANY makes these... order in METRIC
Polypropylene Triple Carbon
Where is it made?
Is it that much different clinically compared to Polyethylene?
AMERICA... order in INCHES
Not clinically different compared to its German counterpart
What is it a mixture of?
What is another name for this material?
It is a mixture of POLYETHYLENE + POLYPROPYLENE
this is called COLENE
Are these good for orthoses?
Common name? Common use name?
NOT GOOD ORTHOSES -- THEY CRACK
methyl methacrylate ... bone cement
Where is it made?
What was this combination of?
What are some manufacturing names of this material?
Is it still sold?
Acrylic + Acrylonitrile... this no longer cracks compared to just acrylic alone
THERMOLAST1 + THERMOLAST2
This is NOT STILL SOLID
What is the composition of these?
What is the primary indication for these orthoses?
What are manufacturer names for this?
What is the manufacturer?
acrylic/polypropylene + carbon graphite
indicated for their STRENGTH AND RIGIDITY with MINIMAL THICKNESS
CARBOPLAST / SUPERFOAM .. TL2100 / TL BLUE
NORTHWEST LABS makes SUPERFEET... they don't sell their material to anyone
Where is it made?
What is it indicated for?
Describe Pink Plastazote properties... is it still used?
Used for plantar ulcer healing... 1st material of choice
Closed cell / polyethylene foam / heat moldable / self accomodating... NOT STILL USED... we use WHITE PLASTAZOTE NOW
What is this now used for?
BK prostheses... low durometer / closed cell foam
How are they made?
What are common names?
vulcanized synthetic latex
NEOPRENE CONTAINS AIR BUBBLES... NEOPRENE FOAM
What is it made of?
How thick was original?
What is SBR? What country makes it?
prevents blistering on the plantar aspect of runners feet
NEOPRENE with DACRON MESH... THREE WAY STRETCHING ABILITY AND WONT BREAK
1/8th thick... PRE FAB ORTHOSES
SBR = STYRENE BUTADIENE RUBBER... GERMANY
Vibram soles... Italian mountain climber invented... no evidence barefoot running is better
Is it open or closed cell? Thermoforming?
What is Thermosky?
What is EVA PUFF similar to?
"vinyl" generic name
OPEN or CLOSED! it IS THERMOFORMING
Thermosky = EVA only
similar to pink plastazote
What is the story behind?
Are they thermoforming?
What is the drawback to these?
what is the main synonym for this material?
Story of Rogers + Langer... Rogers made for Langer... contract broken... both sell their own very similar version now
NOT thermoforming... it is thermoSET
BAD TENSILE STRENGTH
MEDICAL GRADE PORON
What are some names?
SILIPOS and BAUERFEIND
PVC (poly vinyl chloride)
What is their use?
NAUGEHYDE - synthetic leather
COVER FOOT ORTHOSES
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