Effect of Surface Treatments on Micro-shear Bond Strength of Resin Cement to Hydroxyapatite Ceramic Doped with Calcium Zirconate
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Abstract
The purpose of this study was to evaluate the micro-shear bond strength between Multilink® N resin cement and hydroxyapatite doped with calcium zirconate ceramic after different methods of surface treatment. Thirty-two cylindrical shaped ceramic specimens,10 millimeters in diameter and 4 millimeters in height, were embedded into metal mold and polished. The specimens were randomly divided into eight groups and received different surface treatment methods. Multilink® N resin cement was then cemented on to each specimen by injecting the cement into polyethylene tubes that were 0.8 millimeter in diameter and 0.5 millimeter in height. There were four resin cements fixed on each specimen and each group had 16 specimens (n=16). All specimens were stored in distilled water at 37˚C for 24 hours. The micro-shear bond strength test was performed. The mode of failure was inspected under stereomicroscope. The results showed that the highest micro-shear bond strength was found in 37% phosphoric acid etching then conditioning with Cesead N Opaque primer group (17.78±2.42 MPa) and 37% phosphoric acid etching group (17.52±1.16 MPa). CojetTM with silane application (15.21±3.33 MPa), sandblasting with Cesead N Opaque Primer conditioning (14.29±2.22 MPa), sandblasting (6.85±1.12 MPa), and Cesead N Opaque Primer conditioning (5.71±2.00 MPa) significantly improved bond strength compared to no treatment group (p<0.05). However, surface treatment with 5% hydrofluoric acid showed similar bond strength (4.97±0.84 MPa) to no treatment group (0.39±0.15 MPa)
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