Week 8- Class I, III, VI direct composite restorations

Question 1

according to the ADA, if done properly, posterior composites can have same longevity of amalgams?

Answer 1

true

Question 2

longevity of posterior composite directly r/t factors such as

Answer 2

restoration size
caries risk
operator technique

Question 3

what is the main contraindication of posterior composite?

Answer 3

area that cannot be isolated

large occlusal stresses

Question 4

if box extends onto tooth’s root surface:

Answer 4

do not use composite

Question 5

advantages of composite restorations

Answer 5

aesthetics
conserve tooth structure
less complex tooth preps
insulation
decreased microleakage
short term strength of remaining tooth structure

Question 6

disadvantages of composite restorations

Answer 6

polymerization shrinkage
low fracture toughness
technique sensitive
greater localized wear
unknown biocompatibility

Question 7

contraindication to pit & fissure sealant

Answer 7

active caries on tooth

Question 8

pit/fissure sealants use

Answer 8

low viscosity resin after etching

Question 9

process of applying sealant

Answer 9

1. clean tooth with pumice
2. rinse
3. etch
4. apply sealant

Question 10

true or false: you can combine a small class I restoration with sealant

Answer 10

true

Question 11

primary choice of restoration for primary occlusal lesions

Answer 11

preventative resin and composite restorations

Question 12

class VI restorations

Answer 12

small faulty developmental pit on cusp tip

lesion usually restricted to enamel

Question 13

how is retention obtained in class I direct composite restoration?

Answer 13

bonding

Question 14

class I direct composite restoration

Answer 14

create convenience form

retention obtained by bonding

Question 15

small to moderate class I restorations

Answer 15

conservative flared cavosurface forms

no uniform or flat pulpal/axial walls

Question 16

moderate to large class I restorations

Answer 16

flat walls perpendicular to occlusal forces
strong marginal configurations
enter tooth area most affected FIRST
depth .2mm internal to DEJ 
follow central groove

Question 17

to maximize polymerization effects

Answer 17

cure incrementally

Question 18

restoration steps

Answer 18

1. place adhesive/bonding agent over entire prep
2. polymerize
3. place liner if close to pulp, if not use glass-ionomer

Question 19

RGMI

Answer 19

• bonds to dentin without opening tubules
• releases fluoride
• favorable elastic modulus = reduced shrinkage

Question 20

how to offset negative advantages of high C factor?

Answer 20

use of liner

Question 21

use of liner helps prevent

Answer 21

microleakage

Question 22

contouring and polishing occlusal surface should use what bur?

Answer 22

carbide or diamond finishing

Question 23

class II composite restoration should be used when:

Answer 23

periphery remains in enamel (no root involvement)

Question 24

used to restore proximal contacts in class II restoration

Answer 24

wedges

Question 25

small class II restoration methods

Answer 25

box technique

facial or lingual slot prep

Question 26

box technique for class II

Answer 26

box technique if proximal surface defective but no lesions on occlusal surface

Question 27

facial or lingual slot prep for class II

Answer 27

lesion accessed from facial or lingual side rather than marginal ridge

Question 28

moderate to large class II restoration

Answer 28

prep 0.2mm internal to DEJ
keep faciolingual width as narrow as possible
dentin caries removed LAST after outline completion

Question 29

when are dentin caries removed in class II?

Answer 29

LAST, after outline completion

Question 30

axial wall of class II prep should be:

Answer 30

0.2mm internal to DEJ

have outward convexity

Question 31

true/false? you should bevel the lingual walls of class II prep?

Answer 31

false; do not bevel prep but remove unsupported enamel rods

Question 32

restorative technique for class II: most important things

Answer 32

selection and proper placement of matrix

Question 33

matrix for class II

Answer 33

ultra thin metal matrix placed PRIOR to adhesive placement

Question 34

bovine ring

Answer 34

stabilizes matrix band

provides additional tooth separation

Question 35

you should restore what part of class II restoration first?

Answer 35

box

Question 36

true/false: if composite is stiff, it can be heated prior to insertion

Answer 36

true

Question 37

what tool is used to remove interproximal overhang?

Answer 37

no.12 surgical blade

Question 38

full coverage, extensive class II prep

Answer 38

add additional retentive features such as grooves, locks, slots

Question 39

why are extensive class II preps not recommended?

Answer 39

decreased tooth structure available for bonding

increased concern for retaining composite in tooth

Question 40

extensive class II prep differences

Answer 40

cusps may be capped
greater extensions in most areas
secondary retention features
more resistance forms

Question 41

where to make depth cuts in extensive class II prep?

Answer 41

into a cusp that will be capped early in prep

reduced cusp relatively flat

Question 42

problem with reduced cusp

Answer 42

significantly reduces retention and resistance form

Question 43

cusp capping does what?

Answer 43

restorative material to increase tooth resistance form

Question 44

in an extensive class II restoration, where will most of composite bond be?

Answer 44

to dentin

therefore, more technique sensitive