Under which condition is porcelain bonded to metal considered to be strongest?

Porcelain bonded to metal exhibits its strongest characteristics under compression. This strength is due to the inherent properties of porcelain, which, while brittle, can withstand compressive forces effectively without cracking. In dental applications, such as crowns or bridges, where porcelain is fused to a metal substrate, the combination can resist forces applied during chewing or biting when these forces are primarily compressive.

In contrast, tension and shear forces can lead to stress concentrations that may result in failure if the forces exceed the material limits. Therefore, understanding the types of forces acting on dental restorations is crucial for ensuring the longevity and durability of the prosthetic devices. Since compressive forces are prevalent in the mouth during typical function, designing dental restorations that capitalize on this strength can help ensure their performance under normal oral conditions.