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Related Experiment Videos

Bond strength values: should they be considered in material selection?

M Rosen1, J Klompas, P J Becker

  • 1Division of Oral Health Auxiliary Training, University of the Witwatersrand, Johannesburg, South Africa.

The Journal of the Dental Association of South Africa = Die Tydskrif Van Die Tandheelkundige Vereniging Van Suid-Afrika
|May 1, 1995
PubMed
Summary

This study compared the shear bond strength of four glass ionomer cements (GICs). Fuji II LC showed the highest bond strength, while Variglass VLC showed the lowest, highlighting variability in GIC performance.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Adhesive Dentistry

Background:

  • Glass ionomer cements (GICs) are widely used in restorative dentistry.
  • Accurate assessment of GIC bond strength is crucial for clinical success.
  • Manufacturer-reported bond strength data may vary from standardized testing.

Purpose of the Study:

  • To determine the shear bond strengths of four specific glass ionomer cements (Fuji II LC, Aqua Ionofil, Variglass VLC, Vitremer) under standardized laboratory conditions.
  • To compare the experimentally determined bond strengths with manufacturer-reported values.
  • To evaluate the comparability of bond strength data across different testing methodologies.

Main Methods:

  • Preparation of standardized flat dentine surfaces on human third molars.

Related Experiment Videos

  • Bonding of ten cylinders of each of the four GICs (Fuji II LC, Aqua Ionofil, Variglass VLC, Vitremer) to dentine.
  • Storage of specimens in distilled water for 96 hours.
  • Determination of shear bond strength using an Instron testing machine.

    • Main Results:

    • Mean shear bond strengths varied significantly among the tested GICs.
    • Fuji II LC exhibited the highest mean bond strength (15 MPa), while Variglass VLC showed the lowest (2 MPa).
    • Aqua Ionofil and Vitremer demonstrated intermediate bond strengths, ranging from 5 to 6 MPa.
    • Experimentally determined values differed from manufacturer-reported data for all tested GICs.

    Conclusions:

    • Significant variations exist in the shear bond strength of different glass ionomer cements when tested under standardized conditions.
    • Discrepancies between laboratory findings and manufacturer claims highlight the influence of testing methodologies.
    • Shear bond strength data alone should not be the sole basis for selecting glass ionomer cements for clinical application.