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Tooth does not posses the regeneration ability found in most other tissues, therefore once enamel dentin is lost as a result of caries trauma or wear restorative materials must be used to reestablish the from and function. A new era in dental restorative materials began in 1955 when Buonocore found that acrylic resins,which formed acceptable micromechnaical adhesion with dry enamel,that had been etched with phosphoric acid. In the current age of adhesive dentistry or microdentistry conservation of tooth structre is the prime importance, rather than extension for prevention. As a treatment guideline emphasis is placed on conservation of tooth structre is of prime importance.

When determining the best course of treatment for a tooth, factors such as depth of cavity, physical properties of materials, estheics and functional demands on the completed restoration, induvidual health, oral hygine, quantity and quality of saliva, motivation, envoirnmental and biocompatibility of the dental material. Success of any dental material depends on ablity of a restorative material to prevent microlekage, preventing secondry caries and staning of restoration margins does not occur.