On creep mechanisms in amalgams

Area of Science:

• Materials Science
• Metallurgy
• Dental Materials

Background:

• Dental amalgams are widely used restorative materials.
• Understanding their long-term mechanical behavior, particularly creep, is crucial for clinical longevity.

Purpose of the Study:

• To investigate the creep mechanisms in conventional and non-gamma 2 dental amalgams.
• To elucidate the role of back stress in steady-state creep.

Main Methods:

• Utilized the "stress-dip" technique to measure back stress during steady-state creep.
• Examined pre-polished vertical surfaces of cylindrical specimens post-creep using microscopy.

Main Results:

• Observed clear indications of superplastic flow in the amalgams studied.
• Identified evidence consistent with dislocation creep mechanisms.

Conclusions:

• Both superplastic flow and dislocation creep contribute to the deformation of dental amalgams.
• The findings enhance the understanding of amalgam behavior under sustained load.