Chemically stable translucent apatite glass ceramic

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 35/447 (2006.01) A61C 13/083 (2006.01) A61K 6/033 (2006.01) A61K 6/06 (2006.01) C03C 10/16 (2006.01) C04B 35/057 (2006.01) C04B 35/553 (2006.01)

Patent

CA 2239869

An apatite glass ceramic is described which is characterized by good chemical stability, a low expansion coefficient and high translucence, and is particularly suitable, by itself or together with glasses or other glass ceramics, as a veneering material for ceramic dental restoration. The apatite glass ceramic contains CaO, P2O5 and F in a molar ratio of CaO : P2O5 : F 1 : 0.020 to 1.5 : 0.03 to 4.2 and contains apatite crystals as the main crystal phase. Preferably the apatite glass ceramic has a molar ratio of CaO : P2O5 : F is 1 : 0.1 to 0.5 : 0.1 to 1Ø The apatite glass ceramic preferably has a loss of mass, determined according to ISO specification 6872:1995 of less than 200.

Divulgation d'une vitrocéramique en apatite, caractérisée par une bonne stabilité chimique, un faible coefficient de dilatation et une haute translucidité, particulièrement utile, en elle-même ou avec des verres ou d'autres vitrocéramiques, comme matière de facette prothétique pour la restauration dentaire à l'aide de céramique. La vitrocéramique en apatite contient du CaO, du P2O5 et du fluor dans un rapport molaire 1 : 0,020 à 1,5 : 0,03 à 4,2, et la phase cristalline principale est constituée de cristaux d'apatite. De préférence, la vitrocéramique en apatite a un rapport molaire CaO : P2O5 : F égal à 1 : 0,1 à 0,5 : 0,1 à 1,0. La vitrocéramique en apatite a de préférence une perte de masse inférieure à 200, déterminée conformément à la norme ISO 6872:1995.

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