Effect of thione and phosphate priming agents on the bonding to a gold alloy of three composite luting agents

Mika Furuchi, DDS, PhD,a,b Mariko Nishimaki, DDS,c Hiroyasu Koizumi, DDS, PhD,a,b Kota Okamura, DDS,c Takaya Ishii, DDS, PhD,a,d and Hideo Matsumura, DDS, PhDa,b

aDepartment of Fixed Prosthodontics, and bDivision of Advanced Dental Treatment, Dental Research Center, Nihon University School of Dentistry, cDivision of Applied Oral Sciences, Nihon University Graduate School of Dentistry, dJuntendo Tokyo Koto Geriatric Medical Center, Tokyo, Japan

Purpose: The purpose of this study was to evaluate the effect of metal priming agents on the bond strength between a gold alloy and composite luting agents.
Materials and Methods: Disk specimens were cast from a gold alloy (Degudent U) and air-abraded with alumina. Four priming agents (Alloy Primer, Estenia Opaque Primer, Metaltite, and V-Primer) were applied separately to the abraded surface. Unprimed specimens served as the control. Three composite luting agents (Esthetic Cement, Panavia F2.0, and SA Luting) were inserted into the brass ring on the cast disks and were chemically-polymerized. The specimens were stored in 37?C water for 24 hours and subsequently thermocycled (5?C-55?C, 1-1 minute, 20,000 cycles). The shear bond strengths were determined, and the results were analyzed using the Steel-Dwass multiple comparison test.
Results: The application of Metaltite enhanced the bond strength of three luting agents. The Estenia Opaque Primer, V-Primer, and Alloy Primer were effective in bonding the gold alloy and Esthetic Cement, whereas the bond strength of the SA Luting did not improve with use of the Estenia Opaque Primer, V-Primer, or Alloy Primer.
Conclusion: Thione-based priming agents (Alloy Primer, Metaltite, and V-Primer) were substantially effective for bonding the gold alloy with specific composite luting agents.(Asian Pac J Dent 2011; 11: 55-60.)

Key Words: bonding, composite, gold alloy, luting agent, primer