Lecture 2

Question 1

Advantages of an ACC (5)

Answer 1

1. Superior esthetics
2. Excellent translucency
3. Best color stability
4. Biocompatibility
5. Silica based all ceramic restorations can be bonded to tooth structure

Question 2

Disadvantages of an ACC (6)

Answer 2

1. Brittle
2. Proximal and lingual reduction
3. Margin adaptation
4. High requirement cavosurface angle
5. Not for FDP abutment
6. Opposing tooth wear

Question 3

Indications for an ACC (4)

Answer 3

1. High esthetic demand
2. Conservative restoration would be inadequate
3. Sufficient tooth structure to support the restoration
4. Favorable occlusal load

Question 4

Contraindications for an ACC (6)

Answer 4

1. Reduced esthetic demand
2. More conservative restoration can be used
3. Unable to provide adequate support or an even circumferential shoulder width of 1mm
4. Alloy post and core
5. Unfavorable occlusal load
6. Parafunctional activity

Question 5

Biologic considerations of an ACC prep (5)

Answer 5

1. Conservation of tooth structure
2. Avoidance of overcontouring
3. Supragingival margins
4. Harmonious occlusion
5. Protection against tooth fracture

Question 6

Mechanical considerations of an ACC prep (3)

Answer 6

1. Retention form
2. Resistance form
3. Deformation

Question 7

Esthetic considerations of an ACC prep (4)

Answer 7

1. Minimum display of metal
2. Maximum thickness of porcelain
3. Porcelain occlusal surfaces
4. Subgingival margins

Question 8

Dimension requirements for an ACC prep:

1. Incisal Reduction:
2. Facial Axial Reduction:
3. Circumferential Finishline:
4. Lingual Clearance:
5. Outline (finishline, margin):

Answer 8

1. Incisal Reduction: 2mm
2. Facial Axial Reduction: 1mm
3. Circumferential Finishline: 1mm
4. Lingual Clearance: 1mm (concave)
5. Outline (finishline, margin): 0.5mm abouve free gingival margin

Question 9

Biologic considerations for a provisional (5)

Answer 9

1. Protect pulp
2. Maintain periodontal health
3. Provide occlusal compatibility
4. Maintain tooth position
5. Protect against fracture

Question 10

Mechanical considerations for a provisional (3)

Answer 10

1. Resists functional loads
2. Resist removal forces
3. Maintain interabutment alignment

Question 11

Esthetic considerations for a provisional (4)

Answer 11

1. Easily contourable
2. Color compatibility
3. Translucency
4. Color stability

Question 12

External Surface Form (ESF)

Answer 12

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

Question 13

Tissue Surface Form (TSF)

Answer 13

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