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Related Experiment Videos

Gel phase formation at resin-modified glass-ionomer/tooth interfaces.

E Coutinho1, Y Yoshida, S Inoue

  • 1Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-Facial Surgery, Catholic University of Leuven, Leuven, Belgium.

Journal of Dental Research
|June 26, 2007
PubMed
Summary
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Resin-modified glass-ionomers (RMGIs) bond to teeth via ionic interactions with hydroxyapatite and micro-mechanical interlocking. This study characterized RMGI interactions with tooth substrates to understand their adhesive properties.

Area of Science:

  • Dental Materials Science
  • Biomaterials Chemistry
  • Adhesion Science

Background:

  • Glass-ionomers exhibit excellent bonding retention, potentially due to ionic interactions between polyalkenoic acid and hydroxyapatite.
  • Resin-modified glass-ionomers (RMGIs) combine glass-ionomer and resin composite properties, but their adhesive mechanisms require further elucidation.

Purpose of the Study:

  • To investigate the extent to which the self-adhesiveness of RMGIs is attributable to chemical bonding with tooth substrates.
  • To characterize the interaction of three RMGIs with dentin using advanced microscopy and spectroscopy techniques.

Main Methods:

  • Utilized electron microscopy and atomic force microscopy for interfacial ultrastructural analysis.
  • Employed X-ray photoelectron spectroscopy (XPS) to determine chemical interactions at the interface.

Related Experiment Videos

  • Correlated microscopy findings with XPS data to understand bonding mechanisms.

    • Main Results:

    • Two RMGIs showed shallow hybridization of hydroxyapatite-coated collagen with a deposited gel phase from polyalkenoic acid interaction with calcium.
    • One RMGI bonded to dentin without forming a hybrid layer or gel phase.
    • XPS confirmed electrostatic interaction between RMGI polycarboxylic acids and hydroxyapatite.

    Conclusions:

    • RMGI self-adhesiveness is primarily due to ionic bonding with hydroxyapatite surrounding collagen.
    • Micro-mechanical interlocking contributes to adhesion in RMGIs that also hybridize dentin.