9 - Class II Direct Resin Preparation

Question 1

what are the 3 destructive force of using composite

Answer 1

1. moisture
2. polymerization shrinkage
3. clinical wear

Question 2

destructive forces of composite resin results in what

Answer 2

microleakage and deterioration of the silane coupling agent linking filler particles in resin matrix

Question 3

after removing a wedge, should there be contact by the time you are ready to polish?

Answer 3

YES! if no contact = redo restoration

Question 4

single wedge placement = ___ micron seperation

Answer 4

90 micron

Question 5

three consecutive wedge placement = additional ___ micron separation

Answer 5

12 micron

Question 6

___% PDL recover in 30 seconds

Answer 6

90%

Question 7

total PDL recovery after removing wedge occurs in ___ minutes

Answer 7

2-3 minutes

Question 8

do you put retention grooves with composite

Answer 8

NO

Question 9

there is sinificantly higher microleakage with ___ margins than ___ margins

Answer 9

cementum; enamel

Question 10

what part of garrison matrices touches gingivallly

Answer 10

Question 11

what are the two types of composite matrices we have

Answer 11

garrison and palodent

Question 12

bonding protocol

Answer 12

etch 10-15 sec
rince 5-10 sec/blot dry but still moist
adhese universal 20 sec/light scrub
air thin
cure 10 sec

Question 13

what is selective etch technique

Answer 13

only etch occlusal cavosurface

Question 14

what happens if you overdry when removing etchant

Answer 14

will dessicate tooth

Question 15

how thin of a layer to place first fill of composite

Answer 15

<2 mm

Question 16

why restore in increments

Answer 16

reduce effects of polymerization shrinkage and increases degree of polymerization

Question 17

do you use your micron finishing diamonds dry

Answer 17

NO! use wet!

Question 18

what color are the course finishing strips? most fine?

Answer 18

coarse: brown/white
fine: blue/light blue

Question 19

common clinical problems encountered with posterior resins

Answer 19

1. achieving proximal contact - must pre-wedge
2. adverse pulpal reaction (material, polymer shrinkage, and microleakage)
3. peripheral seal
4. surface finish

Question 20

Answer 20

Question 21

Answer 21

Question 22

what to do with distal cusp on mand 1st molar

Answer 22

1. leave small cusp if solid and intact
2. totally eliminate if greater than 1/2 M-D width is removed
3. cap the cusp - reduce its height by 2 mm and restore

Question 23

what tooth has inclined pulpal floor

Answer 23

mandibular 1st PM

Question 24

what is a term used to denote an outline form used in transition from occlusal to proximal to maintain a 90 degree cavosurface proximal surface

Answer 24

reverse curve

Question 25

what is reverse curve used for

Answer 25

rotated teeth or when contact is markedly to the buccal of the central groove. not to be used regularly