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Related Experiment Videos

Resin modified glass-ionomers: strength, cure depth and translucency.

G J Mount1, C Patel, O F Makinson

  • 1The University of Adelaide. gjmount@ozemail.com.au

Australian Dental Journal
|February 18, 2003
PubMed
Summary

Resin-modified glass-ionomers exhibit enhanced strength when cured with irradiation. Proper incremental placement is crucial for deep cavities to ensure adequate light-cured polymerization and optimal material properties.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry

Background:

  • Three resin-modified glass-ionomers (RMGI) were evaluated, combining acid-base and light-cured polymerization reactions.
  • RMGI materials are designed to retain glass-ionomer's adhesive properties while incorporating a polymerizable monomer.
  • A dual-curing mechanism ensures monomer polymerization through both irradiation and inherent chemical reactions.

Purpose of the Study:

  • To investigate the impact of irradiation on the mechanical strength, depth of cure, and translucency of RMGI materials.
  • To compare the properties of RMGI materials cured solely by acid-base reaction versus those subjected to irradiation.

Main Methods:

  • Shear punch strength tests were performed on specimens with and without irradiation.
  • Depth of cure was assessed using ISO 4049:2000(E) standards immediately after specimen construction.

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  • Translucency was evaluated to determine variations based on curing method (irradiation vs. acid-base alone).

    • Main Results:

    • Irradiation significantly increased the strength of all tested RMGI materials.
    • Depth of cure demonstrated dependence on material shade and irradiation duration.
    • Irradiated specimens showed only a minor increase in translucency compared to non-irradiated controls.

    Conclusions:

    • Irradiation enhances the mechanical strength of resin-modified glass-ionomers.
    • Incremental placement of RMGI materials is recommended for cavities exceeding 3 mm in depth.
    • This technique ensures complete light-initiated polymerization for optimal clinical performance.