ACC prep

Question 1

why use a working die

Answer 1

for making the crowns in the lab

Question 2

trays that are premade and bought

Answer 2

Stock trays

Question 3

why make a custom tray

Answer 3

made in the lab

Question 4

what is an all ceramic crown

Answer 4

a ceramic fixed dental prosthesis that restores a clinical crown without a supporting metal framework

Question 5

advantage of an ACC

Answer 5

Excellent translucency (like tooth)
best color stability
Biocompatible
Silica based all ceramic can be bonded to tooth

Question 6

disadvantges of ACC

Answer 6

Brittle
Proximal and lingual reduction greater
margin adaptation
crical cavosurface angle
not or FDP abutment( certain can be used anterior
Opposing tooth wear (not as much of a problem as feldspathic MCCs)

Question 7

Indications of an ACC

Answer 7

high esthetic need
Conservation restoration would be inadequate
sufficient tooth to support restoration
Favorable occlusal load

Question 8

Contraindications of an ACC

Answer 8

reduced esthetic demand
More conservative restoration can be used
Unable to provide adequate support or even a circumferential should width of 1mm
cast and post core
unfavorable occlusal load
parafunctional activity

Question 9

what ceramic is often used in the posterior

Answer 9

Zirconia

Question 10

why is silica a good choice for an ACC

Answer 10

can be bound

Question 11

benifits of high strength ceramics

Answer 11

less prep needed to be done
less into dentin
less root canals and other problems

Question 12

what dictates the amount of reduction for a tooth prep

Answer 12

the restorative materials

restoration design

Question 13

how is multplanar reduction done

Answer 13

1st plane is parallel to long axis

2nd plane is the facial second plane and the lingual concavity

Question 14

what does the margin location depend on

Answer 14

remaining tooth structure
free gingival margin
smile line etc

Question 15

how should the cavosurface be for an ACC prep

Answer 15

90 degrees with no unsupported enamel cuz ceramics are brittle

Question 16

747.6 bur dimemnts

Answer 16

taper, round
.7 tip
1.1 shapt

Question 17

242.6 bur dementions

Answer 17

flame
.1 tip
1.4 shaft

Question 18

243.6 bur dimentsions

Answer 18

flame

1. 2
2. 6

Question 19

256 bur demesions

Answer 19

flame

1. 3
2. 6

Question 20

702 bur dimensions

Answer 20

taper, flat
.9
1.4

Question 21

770

Answer 21

taper round

1. 2
2. 7

Question 22

862

Answer 22

wheel

4. 1
5. 0

Question 23

285

Answer 23

footbal

2. 3
3. 5

Question 24

ACC prep specs

Answer 24

incisal reduction 2 mm
facial axial reduction 1.2 mm
circumferential finish line 1mm
lingual claeance .8mm
outline  .5 above free gingival margin