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Journal of Dental Research, Vol. 87, No. 7, 666-670 (2008)
DOI: 10.1177/154405910808700705

Biomaterials & Bioengineering

Cooperation of Phosphate Monomer and Silica Modification on Zirconia

R. Tanaka1,2,*, A. Fujishima1, Y. Shibata1, A. Manabe2 and T. Miyazaki1

1 Department of Oral Biomaterials and Technology, School of Dentistry, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan; and
2 Division of Aesthetic Dentistry, Showa University School of Dentistry, 2-1-2, Kitasenzoku, Ohta-ku, Tokyo 145-8515, Japan

Correspondence: * corresponding author, reina.t{at}dent.showa-u.ac.jp

Ceramic restorations with resin-based adhesive systems have been the focus of recent attention in clinical dentistry. Yttrium-oxide-partially-stabilized zirconia (YPSZ) ceramics have optimized physical properties and exhibit favorable fracture toughness, though their bonding properties are problematic. Although functional phosphate monomers and silica-coating by tribochemical modification were expected to improve the bonding properties between YPSZ ceramics and resin-based adhesives, these two methods remain controversial. This study evaluated the efficiency of silica-coating by tribochemical modification of YPSZ ceramics. The application of phosphate monomer and a silane coupling agent on silica-coated YPSZ was also investigated. The silica-coating of YPSZ ceramics by tribochemical modification was not efficient, given the higher mechanical toughness of the densely sintered ceramics. Stable shear bond strength was achieved on silica-coated YPSZ ceramics with the cooperative interaction of phosphate monomer and silane coupling.

Key Words: zirconia • tribochemical modification • phosphate monomer • silane coupling agent • x-ray photoelectron spectroscopy


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