L2

Question 1

ACC

Answer 1

To increase strength, you need bulk. - All ceramic, no metal.

Question 2

ACC advantages

Answer 2

Superior esthetics
Excellent translucency
Best color stability
Biocompatibility
Silica based on ceramic restorations can be bonded to tooth structure
Conservative restoration would be inadequate
Enough tooth structure to support the restoration
Favorable occlusal load
Don’t absorb moisture

Question 3

ACC disadvantages

Answer 3

Brittle
Proximal and lingual reduction
Margin adaptation (this has improved recently).
Critical cavosurface angle
Not for FDP abutment (certain types can be used anteriorly)
Opposing tooth wear, not as much of a problem as feldspathic porcelain
More conservative prep can be used
Unfavorable occlusal load
Parafunctional activity

Question 4

ACC uniform reduction of

Answer 4

1mm except for 2 areas - top, near CEJ (where it is curved - if it were uniform, it would be undercut).

Question 5

Porcelain is brittle, so your cavosurface margin should be

Answer 5

90 degrees -like amalgam.

Question 6

770.8M

Answer 6

1.2 mm diam

Question 7

256.8M

Answer 7

1.0 m diam

Question 8

747.6M

Answer 8

0.6mm diam

Question 9

ACC requires a

Answer 9

shoulder.

Question 10

702.8M

Answer 10

1.0mm flat shoulder bur, tapered

Question 11

515.7M

Answer 11

1.0 mmm diameter flat shoulder bur, not tapered

Question 12

285.5M

Answer 12

football bur

Question 13

862M

Answer 13

round top

Question 14

ACC prep sequence

Answer 14

Make putty guide
Incisal edge reduction
Facial and lingual guiding grooves 1st and 2nd planes
Facial and lingual reductions and break contact
Remove unsupported structure, “lipping”
Refine, check with reduction guide

Question 15

Incisal reduction

Answer 15

2mm

Question 16

Facial reduction

Answer 16

1.2 mm

Question 17

Circumferential finishline

Answer 17

1.0+

Question 18

Lingual clearance (concave)

Answer 18

1.0mm

Question 19

Outline (finishline, margin)

Answer 19

0.5mm above free gingiva

Question 20

Direct provisional

Answer 20

fixed or removable dental prosthesis or max-facial prosthesis, designed to enhance esthetics, stabilization or other function for a limited time.

Question 21

Biologic:

Answer 21

no sensitivity or pain
no swollen or bleeding gums
feels like a tooth
long lasting, no cavities
insulation for vital tooth and pulp recovery
ideal margin sealing
gingival recovery
proper interproximal and occlusal contact
anti-carious, prevent secondary decay

Question 22

Mechanical:

Answer 22

Able to chew without worrying fractures and/or dislodging crowns
Keep everything in place
Resist functional load
Resist removal force
Maintain interabutment alignment

Question 23

Esthetics

Answer 23

Looks like a real tooth
Easily add and subtract
easy to finish and polish
color compatibility
color stability
translucency

Question 24

Provisional requires

Answer 24

External surface form (ESF)

• Represents definitive restoration form
• Determined in diagnostic stage
• Outer contour of the restoration

Tissue surface form (TSF)

• Represents prepared hard and soft tissue that receive the restoration
• Internal contour of the restoration