Glass-ceramic material for dental restoration and method for...

A - Human Necessities – 61 – K

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A61K 6/02 (2006.01) A61K 6/06 (2006.01) C03C 10/00 (2006.01) C04B 35/19 (2006.01)

Patent

CA 2339952

The invention relates to a glass-ceramic material for dental restoration having a high crystalline leucite content. The leucite crystals are needle- or rod-shaped, have a thickness of between 0.3 and 1.5 micrometers and are between 7.5 and 20 micrometers in length. Said glass-ceramic material is substantially semi-transparent and contains, in % by weight: between 67 and 71 % SiO2, between 8 and 12 % Al2O3, between 3 and 5 % Na2O, between 8 and 10 % K2O, between 1 and 3 % CaO, between 0.2 and 2 % BaO, between 0.5 and 2 % CeO2, between 0.2 and 1 % TiO2, and between 0.5 and 2 % B2O3. The above glass- ceramic material presents improved fracture strength and offers new indications for the use of full ceramic materials in dental technology, notably metal-free dental restoration.

L'invention concerne une vitro-céramique qui est destinée à la restauration dentaire et qui présente une teneur leucitique cristalline élevée. Les cristaux leucitiques ont la forme d'aiguilles ou de bâtonnets et ont une épaisseur comprise entre 0,3 et 1,5 micromètres, une longueur comprise 7,5 et 20 micromètres. La vitro-céramique est sensiblement un matériau transparent qui contient (en % en poids): SiO¿2? 67 à 71 %, Al¿2?O¿3? 8 à 12 %, Na¿2?O 3 à 5 %, K¿2?O 8 à 10 %, CaO 1 à 3 %, BaO 0,2 à 2 %, CeO¿2? 0,5 à 2 %, TiO¿2? 0,2 à 1 % et B¿2?O¿3? 0,5 à 2 %. Ce matériau vitro-céramique présente une résistance à la rupture élevée et ouvre de nouvelles perspectives d'utilisation de la céramique pleine dans la technique dentaire, notamment la restauration sans métal.

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