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The aim of this study was to evaluate how alumina-blasting pressure affects the bond strength of CAD/CAM resin blocks (CRBs) to bovine dentin using two different types of resin cements. CRB slices were divided into three groups by alumina-blasting pressure, namely, untreated and 0.1 MPa and 0.2 MPa, and further divided into three subgroups by combination of CRBs surface treatment and types of cement: Scotchbond Universal and RelyX ultimate (RXB), Scotchbond Universal and RelyX unicem2 (U2B), ceramic primer and RelyX unicem2 (U2C). The CRB slices were then cemented to bovine dentin, microtensile bond strength test was performed and evaluated. Regardless of the alumina-blasting pressure, RXB group have the highest µTBS and bond strength tends to increase with increasing alumina-blasting pressure. Alumina-blasting to CRB surface by at an appropriate pressure and use of conventional resin cement were required to obtain strong adhesion with the tooth structure.

Effect of alumina-blasting pressure on adhesion of CAD/CAM resin block to dentin