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  • Title: Tensile strength and microleakage of the bond between a nickel-chromium alloy and a visible light-cured resin composite: effect of 4-META, silicoating, and bead retention.
    Author: Tulunoğlu IF, Oktemer M.
    Journal: Quintessence Int; 1997 Jul; 28(7):447-51. PubMed ID: 9477893.
    Abstract:
    Three retention systems, 4-META adhesive, Silicoating, and a conventional retention beads system, were used for resin-metal bonding. For each group, 40 standard specimens were prepared (20 for microleakage testing and 20 for tensile strength testing). Wax patterns were prepared, invested, and cast with a nickel-chromium alloy. The metal surfaces of the specimens were sandblasted with 250-microns aluminum oxide. Dentacolor Opaque was placed and set in a light curing unit for 90 seconds. Dentacolor resin composite was placed and set in the same unit for 90 seconds. The bonded specimens were subjected to thermocycling process in baths of 5 degrees C and 55 degrees C with 30-second dwell time. The tensile strength test specimens were stored in water, and the microleakage test specimens were stored in 5% basic fuchsin dye for 2 days. The means of the tensile strength test groups were not significantly different. However, the differences in microleakage among groups were found to be statistically significant. As a result, 4-META and Silicoating systems were found to be better than the conventional retention beads system, which allowed the greatest microleakage.
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