[Qualitative marginal gap research on amalgam fillings].

Area of Science:

• Dental Materials Science
• Analytical Chemistry
• Biomaterials

Background:

• Dental amalgam fillings are widely used for tooth restoration.
• Understanding the inorganic composition at the tooth-restoration interface is crucial for assessing material longevity and biocompatibility.
• Conventional amalgams and gamma-2-reduced amalgams differ in their composition and potential degradation products.

Purpose of the Study:

• To analyze the inorganic contents of the interface layer between tooth restorations and both conventional and gamma-2-reduced amalgam fillings.
• To compare the interface composition after short and long clinical applications.
• To identify elements present at the tooth-amalgam interface.

Main Methods:

• X-ray spectroscopy was employed to analyze the inorganic composition.
• Samples included conventional and gamma-2-reduced amalgam fillings after varying clinical durations.
• Elemental analysis focused on the interface layer between the tooth and the amalgam restoration.

Main Results:

• No qualitative differences were observed between the interface layers of conventional and gamma-2-reduced amalgam fillings.
• Key amalgam elements like mercury, silver, and copper were not detected at the interface.
• Tin was universally present, while zinc and oxygen were frequently detected.
• Other elements such as calcium, phosphorus, sodium, and magnesium were also identified in the interface layer.

Conclusions:

• The inorganic composition at the interface of conventional and gamma-2-reduced amalgam fillings is qualitatively similar.
• The presence of tin, zinc, and oxygen, along with endogenous tooth elements, characterizes the amalgam-tooth interface.
• Further investigation may be warranted to understand the functional implications of these observed inorganic elements.