Laminate Veneer

Question 1

Goal of preparation driven by existing tooth surface

Answer 1

to remove a uniform layer of the tooth structure and reproduction of the initial situation (form and function)

Question 2

Aim of Preparation driven by the final volume of the preparation

Answer 2

to restore the original volume of the tooth

Question 3

Finish line is placed supra-gingivally, but in case of:

Answer 3

• Cervical deep discoloration
• Cervical caries / erosion
• Short occluso-gingival height

Question 4

Contact should be opened in case of:

Answer 4

1. Multiple adjacent teeth to facilitate separation of dies without damaging the inter-proximal finish line.
2. Proximal caries.
3. Proximal existing restoration
4. Proximal discoloration
5. Mal-aligned teeth
6. Changing tooth form

Question 5

Cases requiring proximal wrap around:

Answer 5

1. Closing of diastema
2. Malformed tooth (peg shaped lateral)
3. Tooth fracture proximally

Question 6

Advantage of Window design

Answer 6

retaining natural enamel over the incisal edge

Question 7

Disadvantage of Window design

Answer 7

1. the incisal edge enamel is weakened by the preparation
2. the margins of the veneer would become vulnerable if there is incisal edge wear whilst the incisal lute can be difficult to hide

Question 8

Advantage of Feather design

Answer 8

guidance on natural tooth is maintained

Question 9

Disadvantage of Feather design

Answer 9

the veneer is liable to be fragile at the incisal edge and may be subject to peel / sheer forces during protrusive guidance

Question 10

Advantage of Bevel design

Answer 10

1. more control over the incisal esthetics
2. a positive seat during try in and cementation of the veneer
3. The margin is not in a position that will be subjected to direct shear forces except in protrusion

Question 11

When to wrap around?

Answer 11

1. In teeth need esthetic lengthening
2. Fractured incisal edge
3. increased functional stresses on incisal edge in case of lower anterior

Question 12

finish line should be …. the way down the lingual surface and …. away from centric contact connecting the …. proximal finish lines.

Answer 12

1/4
1 mm
2

Question 13

The lingual finish line should not be placed on

Answer 13

concave area otherwise stress concentration on ceramic

Question 14

Important of Tooth preparation

Answer 14

1- To avoid over-contour restoration
2- Margin placement for concealment
3- Color change without over bulking the ceramic
4- Definitive margin for technician to work with
5- Removal of fluoride rich a prismatic layer, which offer a minor retention capacity to improve bonding strength

Question 15

The success of the porcelain veneer is greatly determined by

Answer 15

the strength and durability of the bond

Question 16

The ceramic material is 3 times stronger than the enamel in

Answer 16

tensile strength

Question 17

The restoration derives its strength from

Answer 17

the ability of a composite resin luting agent, with a silane coupling agent, to bond with etched porcelain and etched enamel

Question 18

When not preserve contact area and open the proximal contact?

Answer 18

1- Multiple spacing
2- Diastema closure
3- Proximal restorations
4- Broken angles 
5- Malposition
6- Deep discoloration
7- Multiple laminates (to facilitate separation of the dies without damaging the inter-proximal finish line)