The invention relates to a method for the preparation of a lithium silicate glass or a lithium silicate glass ceramic which comprise cerium ions and are suitable in particular for the preparation of dental restorations, the fluorescence properties of which largely correspond to those of natural teeth.

The invention also relates to a lithium silicate glass and a lithium silicate glass ceramic which can be obtained using the method according to the invention, the use thereof as dental material and in particular for the preparation of dental restorations, as well as a glass-forming composition which is suitable for use in the method according to the invention.

The invention relates to a method for the preparation of a lithium silicate glass or a lithium silicate glass ceramic which comprise cerium ions and are suitable in particular for the preparation of dental restorations, the fluorescence properties of which largely correspond to those of natural teeth.

The invention also relates to a lithium silicate glass and a lithium silicate glass ceramic which can be obtained using the method according to the invention, the use thereof as dental material and in particular for the preparation of dental restorations, as well as a glass-forming composition which is suitable for use in the method according to the invention.

Boron-containing network sulfide glass which may be useful in IR transmitting applications, such as IR optics, laser or fiber amplifiers doped with rare earths with emission in the near IR, and methods of making the same.

Boron-containing network sulfide glass which may be useful in IR transmitting applications, such as IR optics, laser or fiber amplifiers doped with rare earths with emission in the near IR, and methods of making the same.

A copper ion-doped polychromatic fluorescent glass and a preparation method and use thereof are provided. The fluorescent glass has a chemical formula shown as the following: aP.sub.2O.sub.5-bSiO.sub.2-cZnO-dCs.sub.2CO.sub.3-eNaCl-fCuCl, wherein a, b, c, d, e, and f in the formula represent the molar coefficients of compounds, wherein a is 45 to 65, b is 10 to 30, c is 1 to 5, d is 5 to 20, e is 5 to 20, f is 0.1 to 5. The fluorescent can achieve blue, orange and near-infrared photoluminescence under the UV light with higher fluorescent quantum yield.