The document discusses different types of laminate veneer preparations. Type I is called a window preparation with no incisal edge reduction. Type II, called a butt-joint preparation, involves 2 mm of incisal reduction without a palatal chamfer. Type III, or wrap-around preparation, includes 1-3 mm of incisal reduction with a 1 mm palatal chamfer to restrict angle fractures and enhance esthetics. The preparations are performed using round or tapered diamond burs to reduce enamel in a uniform and conservative manner confined to the facial surface of teeth.

1. Laminate Veneer

2. Definition
The laminate veneer is defined as :
Conservative method of restoring the
appearance of discolored , pitted or fractured
anterior teeth . Consists of bonding thin
ceramic laminate veneer on the labial surface
of affected teeth .

3. Indications Contraindications
Discolored or damaged anterior teeth. High caries index .
Poor plaque control.
Extensive existing restoration .
Bruxism .
Advantage s Disadvantages
Superior esthetic .
Wear and stain resistance .
Increased tooth contour
Expensive .

4. Fractured anterior teeth
Staining anterior teeth
Indication

5. indication
Diastema Discoloration

6. Contraindication
Highly caries index
Bruxism

7. The Preparation

8. Types of preparation
1. Type I  called window preparation .
(feather in which the veneer is taken up to the
height of the incisal edge but the edge, is not
reduced).
2. Type II called butt-joint preparation .
( 2 mm incisal reduction without palatal chamfer).
3. Type III  called rab
(3 – 1 mm incisal reduction with 1 mm height
palatal chamfer ).

9. Type I
(window preparation)

10. The reduction must be in :
* Gingival third = 0.3 mm .
* Middle third = 0.5 mm .
* Incisal third = 0.5 mm .
Depiction of enamel
thickness on thefacial
aspect of the tooth

11. A 016 round bur is placed at the tip of the gingival papilla and cuts
the cervical margin in a counterclockwise direction. The bur shaft
is held in contact with the facial aspect of the tooth

12. Using the 016 round bur, the gingival and interproximal
margins are placed at the correct depth.

13. Using the cutter depth wheels bur, make a series of different
depths at various locations of the facial profile of the tooth

14. a 018 tapered diamond bur , the unprepared enamel islands are
removed to the level of the horizontal depth cuts. The reduction
follows the facial contour of the tooth.

15. It utilizes minimal tooth preparation mainly confined within
enamel. Keeping clear of the gingival margins

16. Type II
(Butt joint preparation)

17. In type2 laminate veneers we begin as type I but incisel
reduction is involved with a 1.5 to 2 mm (butt joint).

18. A 2 mm incisal reduction without palatal chamfer [butt
joint] is prepared .
The arrows show the level of the incisal depth cuts. The
distal depth cut is the most gingivally positioned, followed
by the mesial and then the center depth cuts.

19. Reducing the incisel edge with a round or flat
tapered ended bur.

20. The incisal depth cuts are connected creating a uniform
reduction that follows the original curvature of the
incisal edge.

21. Lateral view of prepared tooth

22. Type III
(wrap around)

23. It restricts angle fractures. When the free edge is not
overlaid, the occlusal third of the laminates are very thin ( less
than 0.3 mm) and liable to fracture. It enhances esthetic
properties of laminates.

24. Type III preparation includes labial and
palatal reduction which is distinguished
from Type I & II .

25. 1 mm incisal reduction with 1 mm height palatal
chamfer.

26. A reduction is reduced with a rounded or flat
ended bur.

28. Thank you
Dr. Salah Abdulazim ,
For each word we learned from
you and for all steps of success in
this field walk to.