الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 121 |  |  |
| | | from | 121 | | |
Abstract
A total of 288 nano-filled flowable resin composite micro-cylinders were used to test the repair bond strength of Lava Ultimate indirect CAD/CAM resin composite using the intermediate multimode adhesive, Scotchbond bond Universal in the etch-and-rinse mode and self-etching mode. The indirect composite surfaces were finished up to 1200 grit then specimens were stored in tap water at 37˚C for 6 months before testing. Specimens were divided into 8 main groups according to the surface treatment, either no treatment, surface grinding using medium grit abrasive bur, sandblasting using 50μm aluminum oxide and silica coating, each receiving silane or not. Each of the previous groups were divided into two sub-groups, using the Etch-and-rinse mode of the adhesive or using the self-etching mode. The results of this study showed that there is no statistical significant difference between both adhesive modes. A statistical significant eefect was seen for the different surface treatments used over the repair bond strength, where the highest repair bond strength was found when using silica coating + no silane for both adhesive modes. Application of additional silane either did not affect the bond strength after different surface treatments. Within the limitations of this study, it can be concluded that:
1. Silica coating of the aged resin composite surface used is crucial to improve the repair bond strength, either using etch- and-rinse or self-etching mode of the adhesive.
2. With the different surface treatments used, silane does not influence the repair bond strength.
3. The adhesive mode does not affect the repair bond strength, except when no surface treatment was applied.