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Dimensional changes occurring in a glass-ionomer cement

A D Wilson1, J M Paddon

  • 1Biomaterials Department, Institute of Dental Surgery, Eastman Dental Hospital, London, United Kingdom.

American Journal of Dentistry
|December 1, 1993
PubMed
Summary
This summary is machine-generated.

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Glass ionomer cements undergo significant dimensional changes, primarily contraction, when exposed to drying conditions. Allowing cements to mature before use greatly reduces this effect, while cellulose ethers offer only moderate improvement.

Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Glass ionomer cements (GICs) are widely used dental restorative materials.
  • Understanding their dimensional stability under varying environmental conditions is crucial for clinical success.
  • GICs are susceptible to water absorption and dehydration, potentially affecting their physical properties and longevity.

Purpose of the Study:

  • To investigate the dimensional changes of glass ionomer cements when subjected to desiccating and moist conditions.
  • To evaluate the influence of cement maturation time on dimensional stability.
  • To assess the efficacy of cellulose ethers in mitigating dimensional changes.

Main Methods:

  • Glass ionomer cements were exposed to controlled desiccating and moist environments at 23°C.

Related Experiment Videos

  • Experiments were conducted with varying cement maturation periods.
  • Modified cement formulations incorporating cellulose ethers were tested.

    • Main Results:

    • GICs exhibited significantly greater contraction under desiccating conditions compared to expansion in moist conditions.
    • Increased cement maturation time markedly reduced the magnitude of dimensional changes.
    • The addition of cellulose ethers demonstrated a moderate reduction in overall dimensional instability.

    Conclusions:

    • The dimensional stability of glass ionomer cements is highly sensitive to environmental moisture, with dehydration-induced contraction being a primary concern.
    • Optimizing cement maturation time is a critical factor in minimizing dimensional changes.
    • While cellulose ethers offer some benefit, further strategies may be needed to fully address the dimensional challenges of GICs.