Material Properties

Question 1

Force on 1st and 2nd molars

Answer 1

400-800 N

Question 2

Force on bicuspids

Answer 2

300

Question 3

Force on cuspids

Answer 3

200

Question 4

Force on incisors

Answer 4

150

Question 5

What is stress

Answer 5

Resistance of body upon which force is being exerted

Question 6

Types of stress

Answer 6

Axial
Shear
Bending
Torsional

Question 7

What is tension?

Answer 7

Forces pulling away

Question 8

What is compression?

Answer 8

Forces pushing together

Question 9

What is strain

Answer 9

Change in length, reported as a percentage

Question 10

What region of stress strain curves is the elastic region?

Answer 10

Up to the proportional limit

Question 11

What region of stress strain curves is the plastic region?

Answer 11

Past the PL up to the failure point

Question 12

What is the elastic limit?

Answer 12

Max stress material withstands without permanent deformation

Question 13

What is yield strength?

Answer 13

Stress at which material begins to function aplastically

Question 14

What is ultimate tensil strength?

Answer 14

Max stress before failure in tension

Question 15

What is ultimate compressive strength?

Answer 15

Max stress before failure in compression

Question 16

Fracture strength

Answer 16

Point at which material fractures

Question 17

What is elastic modulus?

Answer 17

Relative rigidity or stiffness within the elastic range (slope helps determine this)

Question 18

What is poissons ratio?

Answer 18

Ratio of lateral increase under compressional stress

Question 19

What is ductility?

Answer 19

Ability to be drawn and shaped into wire

Question 20

What is malleability?

Answer 20

Ability to be hammered into thin sheets

Question 21

What is resilience?

Answer 21

Ability of material to resist permanent deformation

Question 22

What is toughness?

Answer 22

Resistance of material to fracture

Question 23

What is viscoelasticity?

Answer 23

Properties dependent on load rate with a viscous or elastic behavior

Question 24

What is elastic?

Answer 24

Properties independent of loading rate

Question 25

What is hardness?

Answer 25

Resistance to permanent surface indentation

Question 26

What are colloids?

Answer 26

Materials with multiple states. Gels, films, emulsions

Question 27

What is adsorption?

Answer 27

A liquid or gas adhering to surface of a solid, decreases their surface free energy

Question 28

What is absorption?

Answer 28

Diffusing into the solid material

Question 29

What is sorption?

Answer 29

Absorption and adsorption at the same time

Question 30

What is wetting power?

Answer 30

Power of a liquid to spread over a solid

Question 31

What is value?

Answer 31

Quality of | Lightness

Question 32

What is chroma?

Answer 32

Quality of color purity

Question 33

What is metamerism?

Answer 33

Colors match or don't match depending on lighting

Question 34

What is fluorescence?

Answer 34

Emission of light when light has been shown on it

Question 35

What is heat of fusion?

Answer 35

Energy required to convert material to liquid state

Question 36

What is a dielectric?

Answer 36

Material providing insulation

Question 37

What is electromotive force?

Answer 37

Voltage developed by any source of electrical energy

Question 38

What is galvanism?

Answer 38

When a circuit is completed between alive and fillings causing pain

Question 39

What is the range for occlusal force

Answer 39

200-3500 N | Higher in posterior regions lower in anterior