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Related Experiment Videos

Analysis of the enamel/adhesive resin interface with laser Raman microscopy.

Masashi Miyazaki1, Hikaru Sato, Hideo Onose

  • 1Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan. miyazaki-m@dent.nihon-u.ac.jp

Operative Dentistry
|April 3, 2003
PubMed
Summary

This study reveals that resin infiltration into etched enamel varies significantly between dental bonding systems. Raman spectroscopy showed differences in how well bonding agents saturated the enamel, impacting micromechanical retention.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Surface Chemistry

Background:

  • Resin composite adhesion to enamel relies on micromechanical retention via resin infiltration into etched zones.
  • Understanding the chemical changes at the enamel-resin interface is crucial for optimizing dental adhesive performance.

Purpose of the Study:

  • To investigate the chemical composition changes at the enamel-resin interface using laser Raman microscopy.
  • To quantify the depth of resin infiltration and assess its uniformity across different dental bonding systems.

Main Methods:

  • Utilized laser Raman microscopy (System-2000) to analyze the chemical composition of the enamel-resin interface.
  • Examined two-step bonding systems (Mac Bond II, Clearfil Mega Bond, Single Bond) bonded to bovine enamel.

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  • Recorded Raman spectra along a line perpendicular to the interface in 0.2 micrometer increments.

    • Main Results:

    • Observed a gradual decrease in hydroxyapatite, indicating resin infiltration depth varied: 2.2-2.6 µm (Mac Bond II), 1.2-1.6 µm (Clearfil Mega Bond), 5.2-5.6 µm (Single Bond).
    • Detected a gradual transition of bonding agent from resin to tooth structure at the interface.
    • Identified poor saturation of adhesive resin in etched enamel with Single Bond, suggesting non-uniform infiltration.

    Conclusions:

    • The degree and uniformity of resin infiltration into etched enamel differ significantly among tested bonding systems.
    • Raman spectroscopy provides valuable insights into the chemical interactions at the enamel-adhesive interface.
    • Findings highlight the importance of bonding system selection for achieving optimal micromechanical retention in dental restorations.