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.[email protected]
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
