An inlay is an indirect restoration that is constructed outside the mouth from materials like gold or porcelain and then cemented into a prepared tooth cavity. An onlay is similar to an inlay but covers one or more cusps and adjoining occlusal surface. Inlays and onlays are used for large restorations, weakened teeth, teeth at risk of fracture, and dental rehabilitation with metals. They have strengths like strength, biocompatibility, and controlling contours but also have disadvantages like higher costs and technique sensitivity. They can be made using direct or indirect methods.

1. INLAYS AND ONLAYS
By: Mustafa Salar
Supervisor: Dr. Karam Ahmed

5. • A n inlay is defined as a
indirect restoration(filling)
which has been
constructed out of t h e
mouth from gold,
porcelain or other metal
and(cured composite resin)
then cemented into t h e
prepared cavity of t h e
tooth.
INLAY

6. The onlay is same as an inlay ,
except that only covers one or more
cusp and adjoining occlusal surface
of the tooth.
ONLAY

8. 1. Large restorations
2. Endodontic ally treated teeth
3. Teeth at risk for fracture
4. Dental Rehabilitation with cast Metal Alloys
5. Diastema closure and occlusal plane
correction
6. Removable prosthodontic abutment

9. • High caries rate
• Young patients
• Esthetics
• Small restorations

10. • Strength
• Biocompatibilty
• Low wear
• Control of contours

11. • Number of appointment
• Higher chair time
• Temporary Restorationa
• Cost
• Technique sensitive
• Splitting forces

12. METHODS
DIRECT
METHOD
INDIRECT
METHOD

16. 6 flare
•Initial entry is made in the central fossa with a
tapered fissure bur
•Ideallyocclusal depth 1mm in dentine or 2.5mm at
triangular ridges.
•Bur should be vertical its taper provide 3 to 5-degree
divergence

17. 1-Tapered fissure bur is used to create mesial and
or distal proximal boxes 2-thin layer of enamel is
left to protect the adjacent tooth
3-Gingival floor of box should have an axial depth of 1.0 to
1.5mm
4.The axial wall of the box should follow the faciolinual contour
of external surface of tooth

18. 1-All preparation floor and
should be smooth
2- all walls should be divergent
except axial
3-axial wall should be convergent
occlusally

19. Proximal bevel on facial and lingual walls of the box With garnet
disk OR THIN flame shape bur and blend with Gingival and occlusal
bevels.
The walls of the prep should diverge from the gingival floorin the
occlusal direction.

20. 0.5 MM WIDE Bevels
wide
At occlusal proximal and gingival angles

21. Additional retention features
• Used when opposing walls (primary
retention) are short
 Dovtails
 Grooves
 slots

23. • Occlusal preparation
• Proximal boxes
• Cuspal reduction
• Shoulder preparation
• Noncentric cusp
• Gingival bevel
• Shoulder bevel
• Proximal bevels
• Retention grooves

24. Cuspal Reduction