Lec 10 - Class 2

Question 1

class 2 challenge of achieving tight contacts solution

Answer 1

prewedge wooden or ring

Question 2

class 2 challenge of achieving ideal proximal wall contours solution

Answer 2

using sectional matrices

Question 3

class 2 challenge of achieving intimate gingival marginal seal

Answer 3

good wedging, use of flowable liners

Question 4

when there are only interproximal caries in a class 2 we use this prep

Answer 4

class 2 slot

Question 5

this type of class 2 is used when mesial and distal interproximals are carious as well as occlusal

Answer 5

MOD

Question 6

modern composite systems are formulated with variations from the blank molecule for the last 50 years

Answer 6

bisGMA

Question 7

when resin is exposed to light, there is a blank of the molecules

Answer 7

reorganizations

Question 8

volumetric contraction (gelation, hardening, polymerization) of modern composite

Answer 8

2.6-7.1%

Question 9

viscous plastic phase and material is able to flow

Answer 9

pre gel

Question 10

viscous, flow cannot keep up with contraction phase

Answer 10

gel point

Question 11

phase that is rigid elastic when contraction is obstructed stress occurs

Answer 11

post gel phase

Question 12

this happens during post gel phase if bond strength is lower than stress

Answer 12

gap formation

Question 13

this happens during post gel phase if bond strength is higher than the stress

Answer 13

deformation

Question 14

invisible contraction leads to blank

Answer 14

stress

Question 15

stress is usually this much

Answer 15

4-7 MPa

Question 16

problems of contraction in posterior teeth include blank of the resin at the margins, formation of blank forces at the margins, blank in the enamel, and blank of the cusps

Answer 16

separation, tension, fractures, deformation

Question 17

each resin needs a minimum amount of blank to obtain clinically acceptable results

Answer 17

energy

Question 18

energy is measured in blank

Answer 18

joules

Question 19

optimal energy to polymerize a resin

Answer 19

16 joules (40 seconds with curing light)

Question 20

joules formula

Answer 20

watts x time

Question 21

if you double the watts cant you just cut the time polymerizing time in half?

Answer 21

no because it takes time for energy to be absorbed

Question 22

there are blank and blank polymerizing resins

Answer 22

fast, slow

Question 23

blank is formed when the resin cannot adequately contract due to the bond between the resin and the walls

Answer 23

stress

Question 24

during polymerization, only the blank surfaces can act as stress relievers during the plastic deformation of the resin

Answer 24

free

Question 25

fewer free surfaces results in blank

Answer 25

more stress

Question 26

ratio of bonded to unbonded surfaces

Answer 26

C factor

Question 27

c factor of class 3 MF in anterior teeth

Answer 27

4/2=2

Question 28

c factor of class 3 MFL in anterior teeth

Answer 28

3/3=1

Question 29

c factor of class 4

Answer 29

2/4=.5 (lower stress)

Question 30

c factor of class 5 veneer

Answer 30

1/5=5=.2

Question 31

higher stresses are caused by a higher blank

Answer 31

c factor

Question 32

these classes have the highest stress

Answer 32

class 1, class 5

Question 33

class 1 / class 5 c factor

Answer 33

5/1=5

Question 34

these classes have the lowest stress

Answer 34

3,4

Question 35

halogen lights tend to have blank power and these are like the ones we use in b28

Answer 35

lower

Question 36

50-400 J

Answer 36

low intensity

Question 37

Joules =

Answer 37

mW/cm^2

Question 38

400-800 J

Answer 38

medium intensity

Question 39

1000 J +

Answer 39

high intensity

Question 40

two theories to reduce stress generation during polymerization

Answer 40

control amount of resin being polymerized, control the amount of energy given to the resin

Question 41

a way to decrease stress is to apply blank before blank

Answer 41

flowable composite, resin composite

Question 42

a way to decrease stress is to apply final layers in blank orientation

Answer 42

oblique