Dental Materials

Question 1

chemical attraction between unlike molecules

Answer 1

adhesion

Question 2

chemical attraction between like molecules

Answer 2

cohesion

Question 3

index which indicates how one material reacts to temperature extremes in relation to another

Answer 3

Coefficient of thermal expansion

Question 4

force at which a material breaks under pressure

Answer 4

compressive strength

Question 5

slow dimensional change caused by compression

Answer 5

creep

Question 6

ability to undergo change of form without breaking

Answer 6

ductility

Question 7

materials ability to recover its initial shape after undergoing force

Answer 7

elasticity

Question 8

electrical current generated by dissimilar metals in an acidic environment

Answer 8

galvanism

Question 9

process of gelling (solidification by cold)

Answer 9

gelation

Question 10

volumetric weight of one cubic cm or mm of water

Answer 10

gram

Question 11

absorption of a solvent by a gel

Answer 11

imbibition

Question 12

materials capacity to be shaped by force or pressure

Answer 12

malleability

Question 13

linking, branching, or cross linking of smaller molecules

Answer 13

polymerization

Question 14

force at which material cannot return to its original shape

Answer 14

proportional limit

Question 15

contraction of a gel due to loss of a solvent

Answer 15

syneresis

Question 16

force need to stretch material to point of fracture

Answer 16

tensile strength

Question 17

resistance to flow

Answer 17

viscosity

Question 18

change a materials components its properties change

Answer 18

truism

Question 19

Mat - an alloy of mercury with silver, copper, tin and zinc

Answer 19

amalgam

Question 20

Mat - added to amalgam to minimize corrosion (gamma 2 phase eliminated)

Answer 20

copper

Question 21

polish - amalgam and gold

Answer 21

tin oxide

Question 22

polish - for composites

Answer 22

diamond

Question 23

used to SEAL dentin to MEDICATE dental pulp

Answer 23

liners

Question 24

liner that stimulates reparative dentin formation

Answer 24

calcium hydroxide

Question 25

used to provide thermal INSULATION or mechanical PROTECTION for dental pulp

Answer 25

bases

Question 26

cement - exothermic reaction on mixing

Answer 26

zinc

Question 27

cement - binds to dentin, thermal expansion, class V restorations

Answer 27

glass ionomer

Question 28

cement - temporary, orange solvent used to clean contaminated instruments

Answer 28

ZOE - zinc oxide eugenol

Question 29

types of impression materials (2)

Answer 29

rigid - inelastic | flexible - elastomeric (aqueous/non-aqueous)

Question 30

Mat - flexible, aqueous, undergoes physical reaction; temp dependent

Answer 30

Hydrocolloid (agar)

Question 31

Mat - flexible, aqueous, undergoes chemical reaction; Not temp dependent- but temp speeds or slows setting, need for fluff

Answer 31

Irreversible Hydrocolloid (alginate)

Question 32

Mat - flexible, non-aqueous, unstable in presence of moisture

Answer 32

polyether rubber

Question 33

Mat - flexible, non-aqueous, addition reaction silicone

Answer 33

vinylpolysiloxane

Question 34

Mat - primarily made of paraffin, used to modify the shape of impression tray and cushion braces

Answer 34

Utility wax

Question 35

Leading cause of implant failure

Answer 35

mobility - due to inadequate bone, lack of osseointegration, peri-implantitis

Question 36

Active ingredient in Tartar control toothpaste; leading cause of dentinal hypersensitivity

Answer 36

pyrophosphate

Question 37

Active ingredient in Gum care toothpaste; antimicrobial agent

Answer 37

triclosan

Question 38

Active ingredient in Desensitization toothpastes (3)

Answer 38

potassium nitrate, sodium citrate, strontium chloride

Question 39

Highly effective Desensitizers professionally placed (2)

Answer 39

potassium oxalate, fluoride varnish

Question 40

Active ingredient in Vital bleaches (home bleach) (2)

Answer 40

carbamide peroxide, hydrogen peroxide

Question 41

GV Black Class 1

Answer 41

pits and fissures

Question 42

GV Black Class 2

Answer 42

posterior proximals

Question 43

GV Black Class 3

Answer 43

anterior proximals

Question 44

GV Black Class 4

Answer 44

anterior proximals including incisal edge

Question 45

GV Black Class 5

Answer 45

facial or lingual cervical third

Question 46

GV Black Class 6

Answer 46

cusp tips and incisal edges

Question 47

Mat - added to non-metal restorative materials to appear radiopaque in X-rays (2); if not added X-ray will appear radiolucent and look like decay

Answer 47

barium, strontium

Question 48

amount of time used to etch

Answer 48

20 seconds

Question 49

time before stone cast is removed from an alginate impression

Answer 49

30-60 minutes

Question 50

Brinell and Knoop test used to determine

Answer 50

hardness