Microtensile bond strength of ceramic to resin using different silanes

Oral Session - Dental Materials 1: Adhesion - Bond Strength Testing and Mechanisms: 9. Cement Adhesion to Ceramics: no. 27OBJECTIVES: The purpose of this study was to assess the micro-tensile bond strength of a leucite-reinforced feldspathic ceramic to a resin cement using different types of silane primers. METHODS: 18 leucite-reinforced feldspathic ceramic blocks (Ceramco II, Dentsply) in dimensional of 6×6×6 mm were fabricated. The ceramic blocks were ground on wet SiC papers and then cleansed ultrasonically in distilled water. The bonding ceramic surfaces were treated with different silane solutions as follows: Commercial silane as control: Monobond S (Ivoclar-Vivadent); methacryloxypropyl silane and experimental silanes with two concentrations (1% and 2.5%): amino, isocyanate, styryl, and acrylate silanes. The silane application method consisted of ...postprin

An investigation into the different methods of recording centric relation

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Microleakage and Marginal Gap of Adhesive Cements for Noble Alloy Full Cast Crowns

SUMMARY Very limited comparative information about the microleakage in noble alloy full cast crowns luted with different types of adhesive resin cements is available. The purpose of this study was to evaluate the microleakage and marginal gap of two self-adhesive resin cements with that of other types of adhesive luting cements for noble alloy full cast crowns. Fifty noncarious human premolars and molars were prepared in a standardized manner for full cast crown restorations. Crowns were made from a noble alloy using a standardized technique and randomly cemented with five cementing agents as follows: 1) GC Fuji Plus resin-modified glass ionomer cement, 2) Panavia F 2.0 resin cement, 3) Multilink Sprint self-adhesive resin cement, 4), Rely X Unicem self-adhesive resin cement with pretreatment, and 5) Rely X Unicem with no pretreatment. The specimens were stored in distilled water at 37°C for two weeks and then subjected to thermocycling. They were then placed in a silver nitrate solution, vertically cut in a mesiodistal direction and evaluated for microleakage and marginal gap using a stereomicroscope. Data were analyzed using a nonparametric Kruskal-Wallis test followed by Dunn multiple range test at a p&amp;lt;0.05 level of significance. The Rely X Unicem (with or with no pretreatment) exhibited the smallest degree of microleakage at both tooth-cement and cement-crown interfaces. The greatest amount of microleakage was found for Panavia F 2.0 resin cement followed by GC Fuji Plus at both interfaces. No statistically significant difference in the marginal gap values was found between the cementing agents evaluated (p&amp;gt;0.05). The self-adhesive resin cements provided a much better marginal seal for the noble alloy full cast crowns compared with the resin-modified glass ionomer or dual-cured resin-based cements.</jats:p

Bond strength of a dental leucite-based glass ceramic to a resin cement using different silane coupling agents

Aim: To evaluate the effect of different types of novel silane coupling agents with two concentrations on the micro-tensile bond strength of a dental glass ceramic with leucite crystals to a dual-cured resin cement using an optimized method of silane application.Methods: Leucite-reinforced feldspathic ceramic blocks were fabricated, wet ground and cleansed. The bonding ceramic surfaces were treated with different organosilane solutions as follows: Control silane: Monobond S; methacryloxypropyltrimethoxy silane and experimental silanes with two concentrations (1.0 and 2.5 vol%): amino, isocyanate, styryl, and acrylate silanes. The silane application method consisted of brush application, hot air drying followed by rinsing with hot water and drying. Then a thin layer of an unfilled resin and a dual-cured resin cement was light-cured on the ceramic surfaces. The resin–ceramic blocks were stored in distilled water at 37 °C for 24 h and sectioned to produce beam specimens (n=17) with a 1.0 mm2 cross-sectional area. Specimens were then subjected to thermocycling and tested in a micro-tensile tester device. Data were analyzed using analysis of variance and Tamhane post-hoc test.Results: The mean micro-tensile bond strength value for the styryl silane was significantly higher (P&lt;0.05) than the other types of silanes except for the Monobond S. The mean bond strength values for isocyanate silanes were significantly lower than the other silanes tested (P&lt;0.05). No statistically significant difference in the bond strength between the 1.0 and 2.5 vol% of experimental silanes was observed (P&gt;0.05).Conclusions: The micro-tensile bond strength of the leucite-based dental glass ceramic to a resin cement was affected by the type of silane coupling agent and not by the concentration of silane solutions. The best bond strength overall was achieved by methacryloxypropyltrimethoxysilane and experimental styryl silane solutions