Orthotic Design, Composition, Materials

Question 1

Durometer

Answer 1

Measure of hardness, smaller the number the softer the material

Question 2

Open Cell

Answer 2

Pores that are connected to each other, interconnected network that is relatively soft
Will fill with whatever it is surrounded by

Question 3

Closed Cell

Answer 3

Does not have interconnected pores.
Higher compressive strength due to structure
Higher dimensional stability & low moisture absorption.

Question 4

Aliplast

Answer 4

• Closed cell polyethylene foam
• 23 durometer
• Thermoformable & generally white (cushioning and lining of orthotics)

Question 5

Laminates

Answer 5

Material glued and laminated together

Question 6

Bilaminate

Answer 6

2 open/closed foams glued together.
Used for cushioning, covering and diabetic top covers

Question 7

Trilaminate

Answer 7

3 open/closed foams glued together.
Used for cushioning, covering and diabetic top covers

Question 8

Impression Foam

Answer 8

Closed-cell, low density foam
Used for foot capture impressions

Question 9

Carboplast

Answer 9

Composite shell material, carbon & glass fibers in a unique polypropylene matrix
Primarily used for foot orthotic shells.

Question 10

Cushion Cork

Answer 10

Cork/rubber composition, stiff, not generally thermoformable
Used for filler material for heel lifts.

Question 11

Ethylene Vinyl Acetate (EVA)

Answer 11

Can be open/closed cell, wide range of durometers, thickness, colors
Used for top/bottom covers, cushioning, accommodations, wedges, fillers, liners, shell material for soft orthotics

Question 12

Leather

Answer 12

Durable/flexible
straps, shells, covers

Question 13

Neolon

Answer 13

Closed cell neoprene w/ fabric cover
used in soft knee/back/elbow orthoses and top covers

Question 14

Nickelplast

Answer 14

closed cell polyethylene foam
doesn’t bottom out
48 durometer
thermoformable
used in liners and accommodations

Question 15

P-Cell

Answer 15

closed cell EVA foam
20-25 durometer
Used in cushions / covering

Question 16

Plastazote

Answer 16

Lightweight, closed cell, cross linked polyethylene foam in med, firm and rigid densities
Used in cushioning & foam collar shells

Question 17

Cloud

Answer 17

Thin EVA, open cell, 30 durometer

Question 18

Polypropylene

Answer 18

Thermoplastic polymer, softens when heated, hardens when cooled into new shape.
Used in shells/stiff structural needs

Question 19

Copolymer

Answer 19

Mainly polypropylene with small amount of ethylene fiving it the ability to resist fatigue when flexing under load.
Used in LE orthoses

Question 20

Carbon Composites

Answer 20

High tensile strength, light weight, not head adjustable.
Used in energy storing AFOs & foot orthoses.

Question 21

Poron

Answer 21

Medical grade urethane that is not thermoformable
15 durometer
Used in padding

Question 22

Felt

Answer 22

Made from wool - organic compound
Used as cushion

Question 23

Hook/Loop

Answer 23

Velcro - used for closures

Question 24

Nylon

Answer 24

High tensile strength
Webbed straps to secure closures

Question 25

Metal

Answer 25

Stays, hinges, buckles, entire brace

Question 26

Canvas

Answer 26

Heavy duty plain woven for making footwear

Question 27

Crepe

Answer 27

Variety of durometers, colors, irons