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Related Experiment Videos

Oxygen-inhibited layer in adhesion dentistry.

Byoung In Suh1

  • 1Bisco Inc., Schaumburg, IL 60193, USA. sales@bisco.com

Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [Et Al.]
|February 25, 2005
PubMed
Summary
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The oxygen-inhibited layer is not required for successful composite resin bonding. Studies indicate that composite resins bond effectively even without this layer, challenging previous assumptions in dental materials science.

Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • The oxygen-inhibited layer, a surface layer formed during resin polymerization, was traditionally considered essential for achieving optimal bonding with composite resins.
  • This layer contains unreacted photoinitiators and monomers, influencing the subsequent adhesive interface.
  • Understanding its role is critical for optimizing dental restorative procedures.

Purpose of the Study:

  • To investigate the necessity of the oxygen-inhibited layer for composite resin bonding.
  • To evaluate the impact of the oxygen-inhibited layer on bond strength, photoinitiator decomposition, and the degree of conversion.
  • To challenge the conventional understanding of composite bonding protocols.

Main Methods:

Related Experiment Videos

  • Shear and microtensile bond strength tests were performed on composite samples cured with and without an oxygen-inhibited layer.
  • Camphorquinone (CQ) decomposition was analyzed using UV-Visible spectroscopy.
  • The degree of conversion was measured using FTIR spectroscopy on samples with and without post-curing under nitrogen.

    • Main Results:

    • No significant difference in bond strength was observed between samples with and without an oxygen-inhibited layer.
    • The oxygen-inhibited layer exhibited reduced photoinitiator content and a lower degree of conversion after post-curing compared to controls.
    • These findings suggest the layer's limited contribution to overall bond integrity.

    Conclusions:

    • The oxygen-inhibited layer is not essential for achieving adequate bond strength in composite resin restorations.
    • Modern dental adhesives, particularly acidic self-etching types, may be incompatible with self-cured composites due to their acidity, further diminishing the perceived need for this layer.
    • This research supports the use of simplified bonding techniques and materials that do not rely on the oxygen-inhibited layer.