Technique of composite resin

By Amin Abusallamah

Steps of restoration

1. Isolation2. Etching /Conditioning 3. Washing /Drying4. Bonding5. Curing6. Determine shade7. Incremental buildup & curing of composite8. Finish/polish

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 .

Etching /Conditioning

Enamel Dentin

Both the tissues are etched with Phosphoric acid.

Enamel Etching

To cut into the enamel surface through the action of acid

After washing

Etchant

32- 37 % % phosphoric acidphosphoric acid

liquid gel

Dentin conditioning

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

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

Applying Etchant

roughens the surface by removing calcium roughens the surface by removing calcium

from enamel .from enamel .

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.

Etched enamel surface

Bonding

• Bonding agents are unfilled resins that flow into the micro channels and form an interlocking system.

• It is available in liquid form

Application of bond

Apply bonding Apply bonding

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

curing

20 seconds

Determine shade

Matrix band application

Apply matrix band & wedge for class II Build proximal walls with composite

Incremental buildup & curing of composite

Fill the cavity in increments and adjust it.

Cure each increment for 40-45 sec.

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.

Thank you

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