The tooth preparation for a porcelain veneer must have a 1. rough surface. 2. space for the veneer material. 3. margin at least 1mm supragingivally. 4. definite finish line.
(1) and (3)
All of the above.
(1) (2) (3)
(4) only
(2) and (4)
2 explanations
ragban
[Ref.Sturdevant’s Art & Science of Operative Dentistry 5th Edition, Pg 650]
Intraenamel preparation before placing a veneer is strongly recommended for following reasons:
1. to provide space for opaque, bonding or veneering materials for maximal esthetics without overcontouring
2. to remove the outer, fluoride-rich layer of enamel that may be more resistant to acid-etching
3. to create a rough surface for improved bonding
4. to establish a definite finish line.
Whenever possible, margins should be placed supragingivally.
2
ragban
[Ref.Sturdevant’s Art & Science of Operative Dentistry 5th Edition, Pg 650]
Intraenamel preparation before placing a veneer is strongly recommended for following reasons:
1. to provide space for opaque, bonding or veneering materials for maximal esthetics without overcontouring
2. to remove the outer, fluoride-rich layer of enamel that may be more resistant to acid-etching
3. to create a rough surface for improved bonding
4. to establish a definite finish line.
Whenever possible, margins should be placed supragingivally.
ragban
ragban