Final - Chemistry of Resins

Question 1

macromolecule is a blank

Answer 1

polymer

Question 2

is alginate a polymer

Answer 2

nope

Question 3

dentures, restorative materials, pit and fissure sealants, impression materials, cements are all uses of blank in dentistry

Answer 3

polymers

Question 4

polymer that changes elasticity with heat

Answer 4

thermoplastic

Question 5

polymer that requires heat to polymerize because it is liquid form beforehand

Answer 5

thermosetting

Question 6

polymers with only one type of polymer

Answer 6

homopolymer

Question 7

blank are random, block, and grafted or branched polymers are chain structure properties of this type of polymer

Answer 7

copolymer

Question 8

glass transition temperature is the temp at which blank occurs

Answer 8

softening

Question 9

addition in polymerization does not produce blank

Answer 9

byproduct

Question 10

type of polymerization that produces a by product

Answer 10

step growth/condensation

Question 11

in dentistry we like polymerization that does/does not create a byproduct

Answer 11

does not

Question 12

all addition polymerization is initiated by a blank and requires a blank group

Answer 12

free radical, unsaturated

Question 13

steps in addition polymerization

Answer 13

induction, propagation, chain transfer, termination

Question 14

induction during addition polymerization has these two parts

Answer 14

activation by free radical, initiation of polymerization by free radical

Question 15

lengthening of the polymer chain

Answer 15

propagation

Question 16

propagation requires very blank energy and occurs at a blank velocity with the evolution of blank

Answer 16

little, high, heat

Question 17

stage of polymerization in which the growing end of a chain is transferred to another molecule

Answer 17

chain transfer

Question 18

a terminated polymer chain might be blank by chain transfer and it will then continue to grow

Answer 18

re activated

Question 19

termination of a polymer is accomplished in one of these two ways

Answer 19

direct coupling of free radicals, transfer of H atom from one polymer chain to another

Question 20

condensation/step growth polymerization is blank compared to addition

Answer 20

slow

Question 21

common inhibitors of polymerization

Answer 21

impurities, oxygen, methyl ether/hydroquinone

Question 22

these are often added to resins to reduce their softening or fusion temperautres, thereby resulting in a resin that is softer and more flexible and room temps

Answer 22

plasticizers

Question 23

bowens resin that is the backbone of resin composites, is very large, very rigid, strong, hard to mold,

Answer 23

bis GMA

Question 24

more flexible resin than bis GMA and more linear

Answer 24

UEDMA

Question 25

resin to which hydroxy ethyl methacrylate has been grafted

Answer 25

polyacrylic acid

Question 26

smell during D2 year

Answer 26

methylmethacrylate

Question 27

blank of a free radical often uses a tertiary amine as the activator and benzoyl peroxide as the initiatior

Answer 27

chemical activation

Question 28

primary molecule is aka blank

Answer 28

monomer