SEDL / STP / STP1471-EB / STP37551S

Effect of Surface Reaction Layer on Three-Point Flexure Bond Strength of Resin Composite to Cast Ti and Ti-6AI-7Nb

Watanabe, I
Assistant Professor, Baylor College of Dentistry, Texas A&M University System Health Science Center, Dallas, TX

Liu, J
Instructor, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki,

Saimoto, A
Associate Professor, Faculty of Engineering, Nagasaki University, Nagasaki,

Griggs, J
Associate Professor, Baylor College of Dentistry, Texas A&M University System Health Science Center, Dallas, TX

Okabe, T
Regents Professor and Chairman, Baylor College of Dentistry, Texas A&M University System Health Science Center, Dallas, TX

Pages: 7    Published: Jan 2006

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Abstract

This study investigated the effect of the α-case on the three-point flexure bond strength of resin composite to different thicknesses of cast CP Ti and Ti-6Al-7Nb. Cast plates (0.3, 0.5, and 0.7 mm thick) were prepared for each metal. Plates without α-case were also prepared for the 0.5 and 0.7 mm thick CP Ti and Ti-6Al-7Nb. After resin composite was polymerized on the plates, the resin/metal specimens were subjected to three-point bending testing. The fracture force (N) and deflection (mm) at fracture were recorded. The fracture force of the specimens increased with increasing specimen thickness. Specimens without α-case withstood greater fracture force than specimens of either metal with α-case. CP Ti and Ti-6Al-7Nb without α-case deflected more than with α-case. The results suggested that the bonding between the veneer composite and thin cast structures (<0.5 mm) is likely to fail and that the surface reaction layer (α-case) should ideally be removed.