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Related Experiment Videos

Leaching from glass ionomer cements

M S Bapna1, H J Mueller

  • 1Department of Prosthodontics (M/C 910), University of Illinois at Chicago 60612.

Journal of Oral Rehabilitation
|September 1, 1994
PubMed
Summary

Dental cement properties like electrical conductivity and ion release decrease as they set, except for pH. Highly sensitive cements show elevated calcium and fluoride levels, potentially causing tooth sensitivity.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Chemistry

Background:

  • Dental cements are crucial for restorations and prosthetics.
  • Understanding ion release and electrical properties is key to cement performance and biocompatibility.

Purpose of the Study:

  • To compare electrical conductivity, pH, and ion leaching in various dental cements.
  • To investigate the relationship between cement setting, ion release, and potential for tooth sensitivity.

Main Methods:

  • Measured electrical conductivity, pH, and concentrations of fluoride (F-), calcium (Ca), aluminum (Al), and silicon (Si).
  • Analyzed supernatant liquids from four glass-ionomer cements, one buffered ionomer cement, one polycarboxylate cement, and one zinc phosphate cement.
  • Evaluated cements at three distinct setting stages.

Main Results:

  • Electrical conductivity and ion concentrations were highest in unset cements, decreasing as setting progressed.
  • pH showed an inverse trend, increasing as cements approached their set condition.
  • Two pulp-sensitive glass-ionomer cements (Chem Bond, Ketac Cem) exhibited high Ca:F ratios and elevated Ca and F concentrations.

Conclusions:

  • Cement setting significantly influences electrical and chemical properties, including ion leaching.
  • High concentrations of leached ions (F-, Si, Al, Zn) and low pH may contribute to pulp sensitivity.
  • Further research is warranted to elucidate the specific mechanisms of ion-mediated cytotoxicity in dental cements.

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