الفهرس 
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Abstract
Since Buonocore introduced the acid-etching technique, which renders a tooth, surface more receptive for adhesion (Buonocore, 1955), major developments that have improved dentistry have occurred. The development of adhesive resin has changed the design of cavity preparations, replacing the extensive removal of tooth structure (Black, 1917) by more conservative preparation (Fusayama, 1980).
Although adhesion to phosphoric acid–etched enamel is reliable and long –lasting, adhesion to dentin has been far more challenging because of the complex mineral and organic phases of dentin. The bonding mechanism of adhesive resin to dentin proposed by Nakabyashi[1982] was described as micromechanical due to the impregnation and polymerization in situ of monomers into the exposed collagen of demineralized dentin surfaces, creating a hybrid layer (Nakabayashi, 1982) which has been suggested as the main mechanism of adhesion between the adhesive system and conditioned dentin (Walshaw & McComb, 1996).
Even though some of the problems of resin composites, for example, unacceptably low wear resistance.