A set amalgam is a dynamic material that undergoes many microstructural changes during clinical use, related to both the elevated temperature and corrosion-prone environment in the mouth and mechanical forces applied to the restoration. High-Cu amalgams generally perform better clinically, but all amalgams corrode to some extent in the mouth. Future research should involve improvements in the clinical performance of dental amalgams, studies of the mercury release from various types of amalgams and the toxic potential of this exposure, and the development of new amalgam systems that reduce the mercury exposure. Although the longevity of modern amalgams is impressive, it is important for their stability to be increased both clinically and microstructurally. An amalgam should be developed with a stable microstructure that, once set, would not change during clinical use.
Microstructural changes lead to clinical deterioration.
A stable system would not corrode, and the matrix transformation gamma 1 to beta 1 would be prohibited.