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Journal of Dental Research
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*Compound via MeSH
*Substance via MeSH
Hazardous Substances DB
*ALUMINUM OXIDE
*SILICON DIOXIDE
*TITANIUM
*TRIMETHOXYSILYLPROPYL METHACRYLATE
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Biomaterials & Bioengineering

Isocyanato- and Methacryloxysilanes Promote Bis-GMA Adhesion to Titanium

J.P. Matinlinna1,*, L.V.J. Lassila1, I. Kangasniemi2 and P.K. Vallittu1

1 Institute of Dentistry, Department of Prosthetic Dentistry and Biomaterials Research, University of Turku, Lemminkäisenkatu 2, FI-20520 Turku, Finland; and
2 Vivoxid Ltd., Tykistökatu 4 A, FI-20520 Turku, Finland;

Correspondence: * corresponding author, jukka.matinlinna{at}utu.fi

In dentistry, adhesion promotion with 3-methacryloyloxypropyltrimethoxysilane is usually sufficient, but its hydrolytic stability is a continuous concern. The hydrolytic stability of an alternative, 3-isocyanatopropyltriethoxysilane, was compared with that of conventional 3-methacryloyloxypropyltrimethoxysilane. Two silanes, both in 0.1 and 1.0 vol-% in ethanol-water, were evaluated in the attachment of an experimental bis-phenol-A-diglycidyldimethacrylate (Bis-GMA) resin to grit-blasted (with two different systems) titanium. Silane hydrolysis was monitored by FTIR spectrometry. Bis-GMA resin was applied and photo-polymerized on titanium. The specimens were thermocycled (6000 cycles, 5–55°C). Surface analysis was carried out with scanning electron microscopy. Statistical analysis (ANOVA) showed that the highest shear bond was achieved with 0.1% 3-isocyanatopropyltriethoxysilane (12.5 MPa) with silica-coating, and the lowest with 1.0% 3-methacryloyloxypropyltrimethoxysilane (3.4 MPa) with alumina-coating. The silane, its concentration, and the grit-blasting method significantly affected the shear bond strength (p < 0.05). SEM images indicated cohesive failure of bonding, and, in conclusion, 3-isocyanatopropyltriethoxysilane is a potential coupling agent.

Key Words: silanization • FTIR • silica-coating • trialkoxysilanes • titanium

Journal of Dental Research, Vol. 84, No. 4, 360-364 (2005)
DOI: 10.1177/154405910508400413
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