Metal and porcelain crowns
In the past, porcelain crowns were always built upon a metal core. That was the only way they could have enough strength to withstand the tremendous biting forces that are exerted on all of your teeth.

The benefits of all-porcelain crowns
Recent breakthroughs in adhesives, combined with the development of stronger porcelain & ceramic materials, allow us to make crowns entirely out of porcelain.