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Abstract
The purpose of this in-vitro study was to evaluate the Color stability, surface roughness and marginal integrity of endodontically treated teeth restored with CAD/CAM Ceramill® comp and Cerasmart endocrowns after two bleaching protocols (At-home and in-office) after thermo-mechanical aging. A total of 32 mandibular first molar teeth were used in this study. The teeth were divided into two main groups according to the type of the endocrowns material used and two subgroups according to the bleaching protocol. group 1: Endodontically treated teeth restored with Cerasmart endocrowns (16 samples). Subgroup (a): At-Home bleaching Opalescence PF 20% (8 samples). Subgroup (b):In-Office bleaching Opalescence Boost PF 40% (8 samples). group 2: Endodontically treated teeth restored with Ceramill comp endocrowns (16 samples). Subgroup (a): At-Home bleaching Opalescence PF 20% (8 samples). Subgroup (b):In-Office bleaching Opalescence Boost PF 40% (8 samples). Teeth were mounted in epoxy resin blocks during endocrowns preparation and during testing procedure. A specially designed centralizing device was constructed to allow accurate placement of teeth in the epoxy resin blocks. Teeth were endodontically treated, prepared with butt joint design to receive the endocrowns restoration. Teeth were scanned with Cerec omnicam and Cerec software was used to design the restorations. CEREC MC XL machine was used to mill all the restorations. Samples were then sub-divided according to their bleaching protocol either at-home or in-office and cemented using RelyX ultimate clicker resin cement using a standardized loading device