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المستخلص
Metal-ceramic restorations have been judged for long time for their clinical efficacy, however they have been known to cause graying of the gingival margin due to the metal shadow-through. The metals used in these restorations have also known to cause allergic or toxic reactions (Qualtrough & Piddock, 1997).
The increasing demand for esthetics in fixed prosthodontics has led to development of a variety of new types of dental ceramics with improved mechanical properties and superior esthetics (Giordano, 1996 and Hondrum, 1992).
Within the increase in the use of all ceramic restorations, bonding to dentin has been recommended through the use of dentin-bonding agents. Inspite of encouraging results, the absolute reliability and clinical performance of the dentin bond is still impaired by the composite polymerization shrinkage, stresses resulting from their thermal dimensional changes and the heterogenesity of the dentin itself that make it difficult to predict the overall behavior of the dentin resin interface (Magne & Douglas, 1999).
The non metallic restoration concept has also led to an increase in the use of adhesive resin cements that could bond to different substrates. A strong, durable resin bond provides high retention, improves marginal adaptation , prevents microleakage, and increases fracture resistance of the restored tooth and the restoration (Jensen et al., 1989).