Cytotoxicity of amalgams.

Area of Science:

• Biomaterials Science
• Dental Materials
• Toxicology

Background:

• Dental amalgams are widely used restorative materials.
• Understanding their cytotoxicity is crucial for patient safety.
• Factors like composition and aging may influence amalgam toxicity.

Purpose of the Study:

• To compare the cytotoxicity of different dental amalgam formulations.
• To investigate the impact of composition (e.g., zinc, copper, selenium) on amalgam toxicity.
• To assess the effect of aging time on amalgam cytotoxicity using an in vitro cell culture model.

Main Methods:

• Utilized a rapid and sensitive in vitro cell culture assay.
• Tested various amalgam compositions, including zinc-containing, high-copper, and low-copper amalgams.
• Evaluated the cytotoxicity of amalgams with and without selenium, and across different aging times.

Main Results:

• Zinc-containing amalgams exhibited significantly higher cytotoxicity compared to other tested amalgams.
• High-copper amalgams demonstrated cytotoxicity levels similar to low-copper amalgams.
• The addition of selenium did not decrease amalgam cytotoxicity; excessive amounts increased it.
• Amalgam cytotoxicity decreased with extended aging periods, likely due to surface oxidation and further amalgamation.

Conclusions:

• Amalgam cytotoxicity is influenced by its elemental composition, with zinc being a key factor.
• Aging appears to mitigate the cytotoxic potential of dental amalgams.
• Selenium's role in modulating amalgam toxicity is complex and requires further investigation.