High copper amalgam content results in which of the following?

High copper content in dental amalgams significantly enhances several important properties. The inclusion of copper serves to improve the overall strength of the amalgam, making it more durable and resistant to wear and fracture. This increased strength is particularly beneficial for posterior restorations, where the material needs to withstand considerable chewing forces.

Moreover, high copper amalgams exhibit decreased corrosion. Traditional amalgams with lower copper content are more susceptible to corrosion over time, which can compromise the restoration's integrity and longevity. The higher copper content effectively lessens the amount of gamma-2 phase, which is prone to corrosion, thereby enhancing the material's resistance to tarnish and degradation.

Additionally, high copper formulations lead to decreased creep, which is the gradual deformation of the material under sustained load. Amalgams with lower copper content are more prone to creep, risking marginal deterioration and potential failure of the restoration. The high copper versions, however, maintain their shape and structural integrity better under stress.

Therefore, given that high copper amalgams result in increased strength, decreased corrosion, and decreased creep, the most comprehensive answer reflects all these advantages, making the option that includes all of the above the best choice.