Mercury and copper release from amalgams in different soft drinks.

Area of Science:

• Dental Materials Science
• Corrosion and Degradation Studies
• Environmental Chemistry

Background:

• Dental amalgams, particularly non-gamma-2 types, are susceptible to corrosion and ion release.
• Understanding mercury (Hg) and copper (Cu) leaching is crucial for assessing amalgam safety and longevity.
• Environmental factors like pH and chemical composition can influence amalgam degradation.

Purpose of the Study:

• To quantify mercury and copper release from three non-gamma-2 amalgams.
• To evaluate the effect of polishing and different environments (water, soft drinks) on ion release.
• To investigate the phenomenon of amalgam passivation.

Main Methods:

• Testing mercury and copper release over time from polished and unpolished amalgam samples.
• Utilizing a measurement methodology to minimize mercury loss from evaporation and adsorption.
• Conducting tests in deionized water and two types of soft drinks.

Main Results:

• Initial mercury and copper release was higher in water compared to soft drinks.
• Ion release significantly decreased between 24 and 104 hours across all tested conditions.
• Polishing reduced leaching, most notably in water for two of the three amalgams tested.

Conclusions:

• Lower ion release in soft drinks and over time suggests amalgam passivation.
• Passivation is a time-dependent process influenced by the chemical nature of the surrounding environment.
• Polishing can enhance the passivation effect, particularly in aqueous environments.