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Abstract
Aims:To compare the shear bond strength between resin composite and Poly(methyl methacrylate) (PMMA) with various bonding protocols and to evaluate the optical properties of resin composite - layered provisional Poly(methyl methacrylate) (PMMA).Materials and Methods:Eighty cylindrical shape specimens were fabricated from self-polymerized provisional Poly(methyl methacrylate) (PMMA) and they were randomly divided into eight groups. Poly(methyl methacrylate) (PMMA) was mixed and bonded onto the specimens as a positive control group. Resin composite was bonded to MMA-wetted surface without bonding agent as a negative control group. All remaining groups were bonded to resin composite using different bonding agents (Scothbond Universal, Luxatemp glaze&bond, and HC Primer) with and without MMA wetting. Shear bond strength testing was performed using a universal testing machine. Various shades of 0.5 mm-thick resin composites were layered onto 1.5 mm-thick PMMA both light and dark shade, with the most effective bonding protocol. Color differences between resin composite and – layered provisional Poly(methyl methacrylate) (PMMA) were measured using Spectrophotometer.Results:Bonding resin composite onto Poly(methyl methacrylate) (PMMA) using luxatemp glaze, bond and HC Primer without methyl methacrylate wetting provided statistically significantly lower bond strength than those of the MMA-wetted Poly(methyl methacrylate) (PMMA) surface. The highest shear bond strength was achieved with the application of Scothbond Universal Adhesive regardless of MMA wetting. The colors of resin composite - layered provisional Poly(methyl methacrylate) (PMMA) were different from the original resin composite color with ΔE results greater than the acceptable threshold (>3.7).Conclusion:Resin composites were able to effectively bond to the MMA-wetted Poly(methyl methacrylate) (PMMA) surface with the application of a tested bonding agent. Layering Poly(methyl methacrylate) (PMMA) with 0.5 mm-thick resin composite could not modify the Poly(methyl methacrylate) (PMMA) shade to the original resin composite color.
Highlights
The provisional restorations need to satisfy the requirements of pulpal protection, occlusal function, strength, and esthetics [1 - 3]
This study proposes to modify provisional restorations by using light-cured resin composite labial veneers facing in conjunction with provisional Poly(methyl methacrylate) (PMMA) material as substructures
One-way ANOVA revealed that shear bond strength values were statistically significantly different among bonding protocols (P < 0.001)
Summary
The provisional restorations need to satisfy the requirements of pulpal protection, occlusal function, strength, and esthetics [1 - 3]. They should have sufficient working time and -simple fabrication techniques. Poly(methyl methacrylate) (PMMA) is extensively being used for provisional restoration fabrication. The thin layer of resin composite effectively bonded to the beneath PMMA would provide a satisfactory esthetic result and economic benefit compared to the whole bulk of resin composite provisional restoration
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