Zircon oxide classification

Abstract

The invention relates to a layered crown which has a graded translucency and coloration such that the layered crown can take an impression similar to the color of natural teeth and with which it can reduce the abrasion of the surface layer (the layer closer to the incisal edge of the dental restoration). The layered crown consists of a surface layer containing argon oxide containing at least one stabilizing component and a graded component layer composed of two or more two unit layers. The unit layers each contain at least one coloring component and zircon oxide contains at least one stabilizing component, and the component gradient is formed by stacking the unit layers in such a way that the amount of stabilizing component in zircon oxide containing at least one stabilizing component in the component gradient remains constant or decreases from the surface layer towards the surface of the sublayer opposite the surface layer. The amount of stable components in zircon oxide containing at least one stable component in the surface layer is less than the amount of stable components in zircon oxide containing at least one stable component in the first component gradient, which is one of the constituent layers of the component gradient and adjacent to the surface layer.