Composite resin technique

1. Technique of composite resin
By
Amin Abusallamah

2. Steps of restoration
1.Isolation
2.Etching /Conditioning
3.Washing /Drying
4.Bonding
5.Curing
6.Determine shade
7.Incremental buildup & curing of composite
8. Finish/polish

3. Isolation
•Composite is a highly technique sensitive material
•Slight contamination or procedural error spoils the
durability of the restoration
•Perfect isolation of operating area is mandatory
•The best isolation is rubber dam .

4. Etching /Conditioning
Enamel
Dentin
Both the tissues are etched with
Phosphoric acid.

5. Enamel Etching
To cut into the enamel surface through the action of acid
After washing

6. Etchant

32- 37 % %
phosphoric acidphosphoric acid
liquid gel

7. Dentin conditioning

•Chemical alteration of dentinal surface by acids to
remove the smear layer and demineralize the
dentin

8. Cont …
Various acid are supplied with various adhesive systems
•Citirc acid
•Maleic acid
•Nitric acid
•Phospshoric acid
Etching time:
Applied for 15-30 seconds
For deciduous teeth : 60 seconds

9. Applying Etchant


roughens the surface by removing calcium roughens the surface by removing calcium
from enamel .from enamel .

10. Washing and Drying
Washing is performed with Washing is performed with
triple syringe for 5-10 triple syringe for 5-10
secondsseconds and then drying. and then drying.

11. Etched enamel surface

12. Bonding
•Bonding agents are unfilled resins that flow into the
micro channels and form an interlocking system.
•It is available in liquid form

13. Application of bond


Apply bonding Apply bonding
agent with help agent with help
of a small brush.of a small brush.

14. curing
20 seconds

15. Determine shade

16. Matrix band application
Apply matrix band & wedge for class II
Build proximal walls with composite

17. Incremental buildup & curing of composite
Fill the cavity in increments and adjust it.
Cure each increment for 40-45 sec.

18. Finish & polish
Tungsten carbide finishing bur is used
to contour the marginal ridge (note the
water spray).
Rugby ball’-shaped fine diamond is
used to contour the occlusal anatomy.
All high-speed instruments must be
used with water spray.
A flexible, abrasive, impregnated disc
is used to polish and smooth the
occlusal contours.

19. Thank
you
Reference:
Pickard’s Manual of Operative
Dentistry, Eighth edition
Chapter 6…. P 111,112
Chapter 8…. P 140,141,142,143