Bond Strength of P
Bond Strength of Poly (methyl methacrylate) Denture Base to cast Titanium and cobalt-chromium Frameworks of Different Designs
Fahad A. Al-Harbi and Mohamed Saber A
Department of Substitutive Dental Sciences, College of Dentistry, University of Dammam, Dammam, Saudi Arabia.firstname.lastname@example.org
Abstract: The lack of a chemical bond between conventional denture base materials and framework elements represents a significant problem in removable prosthodontics. Poor chemical bonding of a denture base resin to cast metal frameworks often introduces adhesive failure and increases microleakage. Purpose. The purpose of this study was to examine the shear bond strength of a denture base acrylic resin to commercially pure titanium alloy (CP Ti) and a cobalt-chromium alloy (Co-Cr) using a hybrid bonding system. Material And Methods. Square plates (of different designs) were cast from the 2 alloys. The plates were grit-blasted with 50 μm of alumina and treated with the Rocatec™ bonding system. A denture base heat-cured acrylic resin was then applied to the plates. Specimens without bonding were also prepared as controls. Both alloys were configured as frameworks with different retentive designs: flat plate, lattice retention, mesh retention and bead retention. Shear bond strength values were determined at a crosshead speed of 0.5 mm/min. Results. For CP Ti plates, shear bond strength was the highest for acrylic resin adhered with Rocatec™ to flat plates, followed by the bead, lattice and mesh designs. The shear bond strength for different retentive Co-Cr frameworks, with or without Rocatec™, was the highest for bead retention, followed by mesh, flat plate and lattice. There was a statistically significant difference (P<.05) in bond strength between the 2 alloys for both flat plate and lattice retentive frameworks bonded with Rocatec™ to acrylic resin. Conclusion. The application of the Rocatec™ bonding system significantly improved the shear bond strength of denture base resin using both cast (CP Ti) and Co-Cr alloys.
[Fahad A. Al-Harbi and Mohamed Saber A. Bond Strength of Poly (methyl methacrylate) Denture Base to castTitanium and cobalt-chromium Frameworks of Different Designs. Life Sci J 2012;9(1):610-616]. (ISSN: 1097-8135).http://www.lifesciencesite.com. 90
Key Words: Denture base, Framework, bond strength, Rocatec bonding, Titanium framework, Cobalt chromium Full Text 90