composite filling technique for class 1

Question 1

what is c factor

Answer 1

configuration factor - affects the developing stresses when cavity restored w composite

ratio on the bonded surfaces to the unbonded or free surfaces in a tooth prep

(want to lower C by increasing free surfaces and decreasing bonded surface area)

Question 2

greater potential for bond disruption is low or high c-factor

Answer 2

high c factor

Question 3

darker or more opaque shades is longer or shorter curing times

Answer 3

longer curing times

Question 4

what does polymerization stress cause

Answer 4

polymerization shrinkage

Question 5

larger bulk of material means more or less polymerization stress

Answer 5

greater polymerization stress

Question 6

incisal, enamel, body, dentin translucent rankings

Answer 6

incisal (translucent)
enamel (less translucent)
body (somewhat opaque)
dentin (more opaque)

Question 7

c factor for class 1

Answer 7

five

Question 8

3 components in a bonding system

Answer 8

conditioner
primer
adhesive

Question 9

what is the conditioner

Answer 9

H3PO4 organic acid etchant

Question 10

is primer hydrophilic or hydrophobic

Answer 10

hydrophilic resin (HEMA)
solvent (acetone, water, ethanol)

Question 11

is adhesive hydrophobic or hydrophilic

Answer 11

hydrophobic resin (Bis/GMA)

Question 12

enamel breakdown

Answer 12

hydroxyapatite 94-96%
water 12%
organic material 2%

Question 13

dentin breakdown

Answer 13

hydroxyapatite 45-65%
organic contents 33%
fluid inside the dentinal tubules 22%

Question 14

water content of dentin is highest or lowest in superficial dentin when compared to deep dentin

Answer 14

lowest in superficial dentin
highest in deep dentin

Question 15

what normally infiltrates the substrate

Answer 15

bonding agent

Question 16

how long for total etch and what is it composed of

Answer 16

15 sec
enamel + dentin

Question 17

how long for selective etch and what does it compose of

Answer 17

20 sec
just enamel

Question 18

how is enamel prepared

Answer 18

using acid to partly demineralize the crystalline structure

Question 19

bond formed by acid etching is what in nature

Answer 19

micromechanical

Question 20

how is dentin prepared

Answer 20

by removing the mear layer produced by cavity prep and modify the surface of the underlying dentin

Question 21

bonding to dentin is chemical or mechanical

Answer 21

chemical

Question 22

bonding to resin tags is chemical or mechanical

Answer 22

mechanical

Question 23

priming of prepared dentin surface w a material that can bond the hydrophilic or hydrophobic ( what type of composite) to the hydrophilic or hydrophobic dentin

Answer 23

hydrophobic material
resin composite
hydrophilic dentin

Question 24

hybrid layer formed by what

Answer 24

resin infiltrated surface layer on dentin

Question 25

what is the goal of ideal hybridization

Answer 25

to give high bond strengths and a dentin seal

Question 26

what bonding are we using

Answer 26

8th generation

Question 27

8th gen total etch steps (2)

Answer 27

etch, then primer + adhesive (2 step)

Question 28

self etch

Answer 28

etch + primer + adhesive (1 step)

Question 29

how long do you apply bonding agent for

Answer 29

20 sec (2 layers)

Question 30

selective etch for how long

Answer 30

20 sec

Question 31

distribute with mild air flow for how long

Answer 31

5 sec

Question 32

light cure for how long

Answer 32

10 sec

Question 33

what is the max thickness for the bottom

Answer 33

2mm