الفهرس 
Assessment of Two Repair Systems For Zirconia and Glass Ceramics
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Abstract
This study was designed to assess the durability of repair bond strength of two repair systems to zirconia and a glass ceramic. The materials tested were IPS e.max CAD and inCoris ZI mono L zirconia. They were cut into slices of 2mm thickness. A total of 28 all ceramic block samples were constructed. After finishing, 7 slices of each material were surface treated by Cojet repair system (tribochemical silica-coating). The other 7 slices were sandblasted and treated with Clearfil repair kit. Before any surface treatment was performed, each slice was embedded in an acrylic block for easier handling and fixation during shear bond testing. In order to standardize the shape and dimensions of the repair composite material over the ceramic samples, specially designed circular split Teflon moulds were constructed. They consist of an inner split Teflon mould with a central hole having an inner diameter of 5 mm and a height of 2 mm assembled by an outer stabilizing metal ring. All specimens were stored in distilled water for 7 days before thermocycling. A total of 28 blocks were loaded under shear at a crosshead speed of 0.5mm/min until failure in a Universal Testing Machine. The shear bond strength data was collected and tabulated. A two-way analysis of variance ANOVA was used to statistically analyze the effect of surface treatment on the shear bond strength between the ceramic materials and the composite resin. Samples were examined by a Scanning electron microscope (SEM) to identify the mode of failure