Acrylic resin

Question 1

these are the unfilled resins

Answer 1

ACRYLIC RESIN

Question 2

why is acrylic resin called the unfilled resin

Answer 2

because it does not have fillers and is not bulky

Question 3

methods of condensation of acrylic resin

Answer 3

1. Bulk Pack Method or Pressure Technique
2. Bead Technique or Nealon’s Technique
3. Flow Method

Question 4

method of condensation wherein the powder and liquid is mixed until a doughy stage is reached

Answer 4

BULK PACK METHOD or PRESSURE TECHNIQUE

Question 5

T or F: in the Pressure Technique, acrylic resin is placed in the prepared cavity in increments using celluloid strips

Answer 5

FALSE. the acrylic resin is placed AS A WHOLE

Question 6

in the bulk pack method, pressure in the acrylic resin is applied using ?

Answer 6

CELLULOID STRIPS

Question 7

in this technique, powder and liquid components of acrylic resin is placed in separate receptacle

Answer 7

BEAD TECHNIQUE or NEALON’s TECHNIQUE

Question 8

consistency of the mixture in the Nealon’s technique should be

Answer 8

WET

Question 9

T or F: cavity walls are wet in the bead technique to make the walls more hydrophilic

Answer 9

FALSE. it is done to make the walls LESS HYDROPHILIC

Question 10

the bead technique may also be used in _____

Answer 10

FABRICATION OF TEMPORARY DENTURE BASE

Question 11

this is the combination of the pressure and bead technique

Answer 11

FLOW METHOD

Question 12

in the flow method, the thin consistency in _________ and __________ of the bulk pack method are used

Answer 12

bead technique; mylar matrix

Question 13

T or F: acrylic resin shrinks as it sets

Answer 13

TRUE

Question 14

T or F: polymerization of acrylic resin occurs rapidly

Answer 14

TRU

Question 15

acrylic resin has high polymerization shrinkage of

Answer 15

7%

Question 16

results of polymerization shrinkage of acrylic resin

Answer 16

1. MARGINAL PERCOLATION
2. MICROLEAKAGE
3. RECURRENT CARIES

Question 17

T or F: acrylic resin, like silicate cement, has low coefficient of thermal expansion

Answer 17

FALSE. acrylic resin has HIGH CTE

Question 18

T or F: acrylic resin, like silicate cement, has low compressive strenght

Answer 18

TRUE

Question 19

pulpal damage may occur because of ….

Answer 19

chemical reaction of monomer and polymer of acrylic resin generating heat

Question 20

disadvantages of acrylic resin (5)

Answer 20

1. poor abrasion resistance
2. high polymerization shrinkage
3. may cause pulpal damage
4. high coefficient of thermal expansion
5. low compressive strength

Question 21

advantages of acrylic resin (4)

Answer 21

1. easy to manipulate (may be done in 1 appointment)
2. tooth matching ability
   3 can be finished to a high luster
3. insoluble in oral fluids

Question 22

components of acrylic resin

Answer 22

1. POWDER
2. LIQUID

Question 23

the principal and building block powder component of acrylic resin

Answer 23

POLYMETHYLMETHACRYLATE

Question 24

initiator component of acrylic resin

Answer 24

BENZOYL PEROXIDE

Question 25

activator of acrylic resin

Answer 25

TERTIARY AMINE/SULFURIC ACID

Question 26

powder components of acrylic resin (3)

Answer 26

1. polymethylmethacrylate
2. benzoyl peroxide
3. tertiary amine/sulfuric acid

Question 27

these regulates the working and setting time of acrylic resin

Answer 27

activator = tertiary amine/sulfuric acid
inhibitor = monomethylether of hydroquinone

Question 28

principal liquid component of acrylic resin

Answer 28

METHYLMETHACRYLATE

Question 29

acts as inhibitor and prevents premature polymerization of AR

Answer 29

monomethylether of hydroquinone

Question 30

liquid components of AR

Answer 30

1. methyl methacrylate
2. ethyldimethacrylate
3. monomethyl ether of hydroquinone