8. ACC III

Question 1

What factors influence the color of the final restoration

Answer 1

• Stump (ND) shade
• Restoration thickness
• Shade and translucency of ceramic
• Cement shade

Question 2

When selecting the shade errors in selecting the correct (hue/chroma/value) are the most noticeable

Answer 2

value

Question 3

If you have a few discolored tooth background what are your options

Answer 3

layered emax (opaque layer coping with more translucent layers (ceramic veneering) to give more lifelike restoration)

Question 4

What are the different levels of emax translucency

Answer 4

• Mutli
• High translucency
• Medium translucency
• Low translucency
• Medium opacity
• High opacity
• Impulse

Question 5

Is it important to know if the emax crown will be layered or not

Answer 5

yes because if it is layered you need more than 1mm facial reduction

Question 6

How much facial reduction is needed for layered emax

Answer 6

1.3 mm

Question 7

What factors need to be considered when determining if the restoration should be layered

Answer 7

• Stump shade

- Final desired shade

Question 8

Outcome of the final restoration shade is more predictable with a (light/dark) stump shade

Answer 8

light

Question 9

The opaque coping layer is how thick

Answer 9

0.7-0.8mm

Question 10

Which bonds better to layering ceramic E.max of Zirconia opaque copings

Answer 10

E.max

Question 11

T/F Major color corrections can be achieved with veneers

Answer 11

F-can’t

Question 12

Most commonly used materials for veneers

Answer 12

• Empress

- Emax CAD and press

Question 13

What restoration is indicated for anterior teeth requiring major color correction

Answer 13

full coverage

Question 14

What is a more conservative adjunct to veneers to help whiten the teeth

Answer 14

bleaching

Question 15

The effect of the cement shade on the final shade of the restoration is small because it is _ nm thick

Answer 15

70 microns

Question 16

Another word for try in paste for a resin esthetic cement is

Answer 16

optical connector

Question 17

Resin cements for veneers are (light/self/dual) cure

Answer 17

Light and dual cure

Question 18

The more transparent the cement the (lighter/darker) the appearance of the restoration

Answer 18

darker (more of the stump shade will show)

Question 19

The try in paste corresponds to the shade of the (polymerized/unpolymerized) cement

Answer 19

polymerized

Question 20

Look at the chart on slide 28

Answer 20

ok

Question 21

What restorative material is the gold standard in patients with parafunction and why

Answer 21

gold because it is strong and non-abbrasive to the opposing dentition

Question 22

What is the only all-ceramic restoration indicated for bruxers

Answer 22

zirconia

Question 23

What are the most common complications (in order of most to least common) of single crowns

Answer 23

• Need for endo
• Porcelain fracture
• Loss of retention
• Perio disease
• Caries

Question 24

What are the most common complications (in order of most to least common) of all ceramic single crowns

Answer 24

• Facture (less of an issue today with the ceramic materials- this was more for feldspathic)
• Loss of retention
• Pulpal health
• Caries
• Perio disease

Question 25

15 year survival rate of empress restorations

Answer 25

75%

Question 26

15 year survival rate of leucite reinforced ACC

Answer 26

69-74%

Question 27

T/F The 15 year survival rate of leucite reinforced ACC is similar to PFM

Answer 27

t

Question 28

Main reason for failure of Leucite restorations

Answer 28

- Loss of retention** (result of bonding) - Fracture - Discoloration - Sensitivity

Question 29

What are the three significant predictors for failure of restorations

Answer 29

- Gender - Parafunctional habits - Non-vitality of the tooth

Question 30

Which gender has more restoration failures and what are the causes of the failures

Answer 30

-Males with higher loss of retention and caries

Question 31

Non-vital teeth often contribute to restoration failure by...

Answer 31

increasing the probability for bond failure

Question 32

Before re-luting a ACC that debonded what should be done

Answer 32

diagnose the cause for the debonding

Question 33

Higher success rates in ACC reztorations may be made by improving the quality of what

Answer 33

the cemented interface

Question 34

Two most common reasons for fracture of ACC restorations are

Answer 34

- Prep guidelines weren't followed | - Parafunctional habits

Question 35

Discoloration may be caused by

Answer 35

mixing ferric sulfate and aluminum chloride

Question 36

Contamination of ferric sulfate may lead to staining and

Answer 36

reduce the bond strength --> microleakage

Question 37

The restoration should be cemented (before/after) the occlusal adjustements have been made and the restoration is polished

Answer 37

after

Question 38

T/F the crown can be adjusted and polished intraorally

Answer 38

t

Question 39

Centric contact on an anterior tooth with an ACC should be where

Answer 39

where the porcelain is supported by tooth structure (i.e in the middle third of the lingual wall)

Question 40

Is leaving the opposing tooth out of occlusion a good idea? Why or why not?

Answer 40

no because it will lead to supra-eruption, protrusive interference , and precipitating fracture.

Question 41

Why can't veneers do significant color correction

Answer 41

because they are thin and translucent

Question 42

Why don't you want to use an opaque veneer

Answer 42

won't look natural (chiclet white smile)

Question 43

How much space is needed for a layered ACC

Answer 43

1.3-1.5mm

Question 44

Try in pastes must be used for (translucent/opaque) restorations

Answer 44

translucent