The effect of three silane coupling agents and their blends with a cross-linker silane on bonding a bis-GMA resin to silicatized titanium (a novel silane system)

Matinlinna, J.P.; Lassila, L.V.J.; Vallittu, P.K.

doi:10.1016/j.jdent.2006.01.008

« Previous Next »Journal of Dentistry
Volume 34, Issue 10 , Pages 740-746, November 2006

The effect of three silane coupling agents and their blends with a cross-linker silane on bonding a bis-GMA resin to silicatized titanium (a novel silane system)

Department of Prosthetic Dentistry and Biomaterials Science, Institute of Dentistry, University of Turku, Lemminkäisenkatu 2, FI-20520 Turku, Finland

Received 2 December 2005; received in revised form 18 January 2006; accepted 20 January 2006.

Abstract

Objectives

Three activated organofunctional silane coupling agents alone and blended with a non-functional cross-linker silane were evaluated as adhesion promoters in an experiment where a bis-GMA (bis-phenol-A-diglycidyldimethacrylate) resin was bonded to silicatized titanium. The adhesive performances of the silanes were assessed as shear bond strength values.

Materials and methods

3-Methacryloyloxypropyltrimethoxysilane, N-[3-(trimethoxysilyl)propyl]ethylenediamine and [3-(triethoxysilyl)propyl]urea were prepared as 1.0vol.% solutions in 95vol.% ethanol. They were each also blended with 1.0vol.% 1,2-bis-(triethoxysilyl)ethane solutions that were activated for 1 or 24h. Titanium slides were cleaned, silicatized, distributed randomly to study groups and silanized with nine silane solutions. After silanization experimental bis-GMA resin stubs were photo-polymerized and post-polymerized in a light-curing unit. The shear bond strength was measured as ‘dry samples’ and after thermo-cycling (6000 cycles at 5–55°C).

Results

The type of silane affected significantly the shear bond strength (p<0.001) and the use of cross-linker silane (p<0.005) according to the statistical analysis (ANOVA). It showed that the highest shear bond strength for thermo-cycled resin stub samples (n=8/group) was obtained with a blend of 1.0vol.% 3-methacryloyloxypropyltrimethoxysilane+1.0vol.% 1,2-bis-(triethoxysilyl)ethane blend (10.4±3.5MPa). The lowest results were obtained with 1.0vol.% [3-(triethoxysilyl)propyl]urea (4.5±1.0MPa), and with 1.0vol.% N-[3-(trimethoxysilyl)propyl]ethylenediamine (4.5±1.4MPa).

Conclusions

Silanization with a blend of a functional silane and a cross-linker silane (a novel silane system) might improve the hydrolytic stability of a siloxane film between silicatized titanium and a bis-GMA resin.

Keywords: Bis-GMA resin, Titanium, Silanization, Silane coupling agent, Silicatization, Silica-coating