It's been stuck for years in our dental practice. Namely, patients are often asked how ceramics, that is, "porcelain" do not break. And it was long ago that porcelain or ceramic when it had a hard surface does not shoot even though it is in a very thin layer. This revelation was first used in making metal crowns. For metallic ceramic systems-metal ceramic bases is metal. It is made of special dental alloys and thick is 03-05 mm. On this metal base, later in three phases, the finishing touches to the finite shape-natural teeth. The whole metal crown is a manual operation.

The cushion-bases are what their name says without metal. There are more and more of them zirconium, which, due to hardness, and for bridges of a larger range of pressed ceramic lithium disilicate. The basis is in many ways made of these materials, and then the ceramics are also salvaged in 3 phases as in the metalokeramikedo of the final shape. The difference between metallic and non-metallic crowns is primarily (aesthetic) in biocompatibility: 1. Namely, unmetallic ceramics is completely bioinerting material-absolutely non-reagent material, which can not be said for metallic ceramics Although the cases of primary penetration into dental alloys are rare, however, they are noticed. There are many bones of changes in soft tissues when we have other metal oxyde or through amalgam fillings It is through electro-chemical potentials that, by means of spraying as a conductor, develops electrochemical potentials, which leads to the visualization of the jonathene metal to the right (what we see), and not so new discoveries and distant tissues (the whole world stood beside amalgam and metal alloys- only we still tolerate it). 2. The advantage but also the difference between the non-metallic ceramic crowns over the metal-ceramic crowns is not only aesthetic. The esthetic superiority of the non-metallic ceramic crowns is particularly visible in the aesthetic zone of the forearm teeth. Because of their openness and opacity they give the impression of naturalness. It does not have to be very sensitive to seeing this difference.