الفهرس 
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Abstract
:Intraoral repair of clinically acceptable fractured ceramometal restorations became a routine practice due to the Intraoral repair of clinically acceptable fractured ceramometal restorations development of new porcelain repair IILer1a1S.
In this study the shear bond strength, microleakage and correlation Ii’-een them, in porcelain repair, were evaluated using two different porcelian ‘nar systems either with or without metal exposure. A total of 64 samples, were iia ‘-ded into two equal main groups of 32 samples each, representing porcelain iiczure with or without metal exposure. Each main group was subdivided into ii”’ subgroups of 16 samples each, representing the Etch Free primer and C & B r.thond, and Scotchbond multipurpose plus porcelain repair systems.
Bonding of composite resin to porcelain and metal surfaces was according iiiii ne manufacturer’s instructions for each repair system.
Six samples of each subgroup were stored in water bath for one week iakwed by immersion in 0.5% aqueous solution of methylene blue dye for 24 iItiiimr while the remaining ten samples were stored in water bath for four weeks IiiL-aed by thermal cycling• and immersion in 0.5% aqueous solution of in1trene blue dye for 24 hours.
The bonded samples were tested in terms of shear using Universal Instron.