[Emission microspectrometric study of the amalgam restoration-tooth interface]

Area of Science:

• Dental Materials Science
• Corrosion Science
• Analytical Chemistry

Background:

• Dental amalgam restorations are susceptible to corrosion at the tooth interface.
• Understanding corrosion products is crucial for predicting restoration longevity and biocompatibility.
• Cavity varnishes are used to reduce microleakage and potentially influence amalgam-material interactions.

Purpose of the Study:

• To identify and characterize corrosion products at the amalgam-tooth interface.
• To investigate the influence of cavity varnish on corrosion product formation over time.
• To determine the elemental composition of early and later corrosion products.

Main Methods:

• Optical Emission Microspectroscopy (OEMS) was employed for elemental analysis.
• Amalgam-tooth interface samples were analyzed at different time points.
• Samples were prepared with and without the application of cavity varnish.

Main Results:

• Time was a significant factor, leading to the appearance of new chemical elements in older specimens.
• A higher concentration of mercury was detected at the restoration interface utilizing cavity varnish within the initial 24 hours.
• The primary corrosion product identified contained tin, suggesting degradation of the amalgam's beta phase (Ag2Hg3).

Conclusions:

• Cavity varnish influences the initial mercury release from dental amalgam restorations.
• Tin is an early component of amalgam corrosion products, indicating degradation of intermetallic phases.
• OEMS is effective in characterizing dental amalgam corrosion products over time.