Isocyanato- and methacryloxysilanes promote Bis-GMA adhesion to titanium

J Dent Res. 2005 Apr;84(4):360-4. doi: 10.1177/154405910508400413.

Abstract

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 degrees 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.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adhesiveness
  • Aluminum Oxide
  • Analysis of Variance
  • Bisphenol A-Glycidyl Methacrylate*
  • Coated Materials, Biocompatible / chemistry
  • Dental Bonding / methods*
  • Dental Cements / chemistry*
  • Dental Stress Analysis
  • Hydrogen Bonding
  • Hydrolysis
  • Materials Testing
  • Methacrylates / chemistry
  • Microscopy, Electron, Scanning
  • Molecular Structure
  • Shear Strength
  • Silanes / chemistry*
  • Silicon Dioxide
  • Spectrometry, X-Ray Emission
  • Spectroscopy, Fourier Transform Infrared
  • Titanium*

Substances

  • (3-isocyanatopropyl) triethoxysilane
  • Coated Materials, Biocompatible
  • Dental Cements
  • Methacrylates
  • Silanes
  • methacryloxypropyltrimethoxysilane
  • Bisphenol A-Glycidyl Methacrylate
  • Silicon Dioxide
  • Titanium
  • Aluminum Oxide