Effects of Primers Containing Thiouracil and Phosphate Monomers on Bonding of Resin to Ag-Pd-Au Alloy

Abstract

The purpose of the present study was to evaluate the effects of four experilnental prinlers on bond strength between a self-curing luting agent and silver-palladiuln-gold alloy. The experinlental primers were in lnixed solutions of a thiouracil primer (Metaltite) and a phosphate primer (Epricord, PM, PE, or PP), which were designated as Metaltite/Epricord,Metaltite/PM, Metaltite/PE, and Metaltite/PP respectively. Three prilners (Metal Primer II, V-Primer, and Alloy Primer) were also prepared as controls. Allunina-blasted metal alloys 'were bonded with acrylic rods. After 5,000 thermocycles, the maximu111 shear bond strength was obtained with Metaltite/PE (27.8±2.4 MPa) and Metaltite/Epricord (27.6± 5.9 MPa), followed by Metaltite/PP, Alloy Prilner, Metaltite, Metaltite/PM, Metal Primer II, V-Primer, and Epricord. PE, PM, and PP showed the lowest bond strength. Results of this study revealed that the cOlnbined use of a thiouracil Inonomer and a phosphate lnonomer ilnproved adhesive bonding. In this light, clinicians should pay attention to the types of functional monomers dissolved in a primer when fabricating resin-bonded prostheses