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 .
Both the tissues are etched with Phosphoric acid.
To cut into the enamel surface through the action of acid
32- 37 % phosphoric acid
Chemical alteration of dentinal surface by acids to remove the smear layer and demineralize the dentin
Various acid are supplied with various adhesive systems
Applied for 15-30 seconds
For deciduous teeth : 60 seconds
roughens the surface by removing calcium from enamel .
Washing and Drying
Washing is performed with triple syringe for 5-10 seconds and then drying.
Etched enamel surface
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 agent with help of a small brush.
curing 20 seconds
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 edition Chapter 6…. P 111,112 Chapter 8…. P 140,141,142,143