Influence of Different Surface Treatments of CAD/CAM Ceramic Materials on Micro Shear Bond Strength of Resin Cement to Two Hybrid Ceramic Materials

Abstract

he bond established between the ceramic material and the tooth structure is extremely important for success and longevity of ceramic restorations. To achieve a strong and durable bond, it is important to understand the ceramic’s internal structure to select the best surface treatment, resin cement, and adhesive system. The bond strength is affected by the surface treatment done for bonding and the oral cavity environment. There are many surface treatments either mechanical or chemical that can be done, but choosing the right protocol of surface treatment according to the type of CAD/CAM material is the purpose of this study. The purpose of the present study was to evaluate the effect of 3 different surface conditioning protocols (Sandblasting & Silane, Hydrofuoric acid & Silane, Laser & Silane) on the bond strength of two CAD/CAM ceramic materials; nano ceramic (CERASMART) compared to polymer infiltrated ceramic (VITA enamic), while using composite resin cement as bonding material. Bonding is assessed according to the values of the micro shear bond strength test. Blocks of two different CAD/CAM esthetic restorative materials (VITA enamic and CERASMART) were used to prepare slices with the following dimensions: 14mm x 12mm x 2mm. Slices were cut using IsoMet 4000 micro-saw. Before any surface treatments, a number of 12 slices of each material were embedded in acrylic blocks for easier handling and fixation