Effect of two phosphate priming agents on bonding to alumina of two luting composites

Hiroyasu Koizumi, DDS, PhD,a,b Daisuke Nakayama, DDS,c Koji Naito, DDS,c Mamiko Kochi, DDS,c Kazuhiro Honda, DDS,c and Hideo Matsumura, DDS, PhDa,b

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

Purpose: The purpose of this study was to evaluate the effect of four ceramic bonding systems on adhesive bonding to high-purity alumina.
Materials and Methods: Different sized alumina disks were bonded with one of the following bonding systems; 1) Clapearl Bonding Agent and Clapearl DC, 2) Clapearl Bonding Agent and Clearfil Esthetic Cement, 3) Clearfil Ceramic Primer and Clapearl DC, and 4) Clearfil Ceramic Primer and Clearfil Esthetic Cement. Bond strengths were determined both before and after application of thermocycling. Results: Average post-thermocycling bond strengths varied from 45.4 MPa to 55.2 MPa, and were categorized into two groups. Two groups, primed with the Clapearl Bonding Agent, recorded the maximal post-thermocycling bond strength. Bond strength of the two groups luted with the Clearfil Esthetic Cement increased statistically after application of thermocycling (p≤0.01).
Conclusion: Among the four bonding systems assessed, priming with the phosphate-based Clapearl Bonding Agent followed by luting with the Clapearl DC composite appeared to be the most consistent and durable system for bonding high-purity alumina.(Asian Pac J Dent 2011; 11: 9-13.)

Key Words: alumina, bonding, composite, MDP, primer