Tensile Bond Strength of Resin Cements to Hybrid Resin Blocks
Objectives: The aim of this study was to evaluate the tensile bond strength between resin cement systems and hybrid resin blocks. Methods: Four hybrid resin blocks were tested: ESTELITE BLOCK (EB), CERASMART (CS), SHOFU BLOCK HC (HC) and KATANA AVENCIA (KA). The resin cement pastes in combination with a primer from the same manufacturer were tested: ESTECEM with Tokuyama Universal Primer (E-U), G-CEM CERASMART with CERAMIC PRIMER 2 (G-C), ResiCem with Porcelain Primer (R-P) and PANAVIA V5 with CLEARFIL CERAMIC PRIMER PLUS (P-C). Plate-shaped specimens of hybrid resin blocks (thickness 2mm, n=5/group) were fabricated by cutting each block using a low-speed saw (IsoMet, Buehler). Specimens were grinded with 1500-grit sandpaper and then sandblasted with 50μm of Al2O3. Bonding area was specified to 3mmφ using double-stick tape. Each primer and cement paste was applied to resin blocks and stainless steel rod (8mmφ) following manufacturer’s recommendation. Specimens were stored under 37°C at 100% humidity for one hour and 37°C water for 24 hours. The tensile bond strength was measured using a universal testing machine (AG-150KN, SHIMADZU) at a cross-head speed of 2 mm/min. The data was analyzed by two-way ANOVA with post-hoc Turkey's HSD test (SPSS statistics, alpha=0.05). Results: Paring EB with E-U showed significantly higher bond strength than the other blocks with the same manufacturer’s cement system. EB and KA showed equal to or higher bond strength than the other blocks with E-U. E-U showed equal to or higher bond strength than that of G-C, R-P and P-C to EB. Conclusions: It is suggested tensile bond strength is influenced by both resin cement systems and hybrid resin blocks. It is supposed that filler composition and content of hybrid resin blocks are important factors for high bond strength resulting from silane-coupling reaction.
IADR/APR General Session
2016 IADR/APR General Session (Seoul, Korea) Seoul, Korea
2016 1891 Dental Materials 2:Polymer-based Materials