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[Dimensional changes of silver and gallium-based alloy].

R Y Ballester1, R A Markarian, A D Loguercio

  • 1Departamento de Materiais Dentários, Faculdade de Odontologia, USP.

Pesquisa Odontologica Brasileira = Brazilian Oral Research
|January 15, 2002
PubMed
Summary

Gallium dental alloys show significant expansion when exposed to saline solution, potentially cracking teeth. Protecting the surface with fluid resin prevents this dimensional alteration, unlike mercury-based dental amalgams.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Dental Materials

Context:

  • Mercury-based dental amalgams pose toxicity risks.
  • Gallium-based alloys offer a potential alternative with similar mechanical properties.
  • Concerns exist regarding gallium alloy corrosion and post-setting expansion.

Purpose:

  • To evaluate the in vitro dimensional alteration of a gallium dental alloy (Galloy) over 7 days.
  • To compare Galloy's dimensional stability with a zinc-containing dental amalgam (F400).
  • To assess the impact of saline solution contact and surface contamination on dimensional changes.

Summary:

  • Gallium alloy specimens immersed in or contaminated with saline solution exhibited significantly greater expansion after 7 days.
  • Protecting the gallium alloy surface with a fluid resin effectively mitigated expansion caused by moisture.

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  • Dental amalgam showed minimal dimensional changes, except when contaminated during trituration.

    • Impact:

    • Findings highlight the risk of excessive expansion in gallium alloys under moist conditions.
    • Surface protection strategies can prevent detrimental dimensional changes in gallium dental materials.
    • This research informs the development of safer, more stable dental restorative materials.