JOERG REINSHAGEN,SASCHA CRAMER VON CLAUSBRUCH,MICHAEL WINTERLING
申请号：
MX2013006915
公开号：
MX2013006915A
申请日:
2011.12.19
申请国别(地区):
MX
年份:
2013
代理人:
摘要：
The invention relates to a blank for producing shaped dental parts which consists entirely of porous glass without crystalline material. The density of the blank is in the range from 50% to 95% of its theoretical density. It has a disc-like shape having a diameter of at least 20 mm. The blank is produced by a process in which glass powder is firstly pressed at a pressure in the range from 10 MPa to 300 MPa and this green body is (pre)sintered at a temperature in the range from 580°C to 750°C to give a blank composed of porous glass without crystalline material. Monolithic shaped dental parts can be obtained from the resulting blank by mechanical machining and subsequent sintering, with a process according to the invention being employed to stabilize the shape of the shaped parts. The glass preferably contains: SiO2 50 - 80% by weight, Al203 3 - 24% by weight, K2O 3-13% by weight, Na2O 3-13% by weight, Li2O 0-4% by weight, B2O3 0-4% by weight, F 0-4% by weight, TiO2 0-8% by weight, ZrO2 0-8% by weight, P2O5 0-4% by weight, SnO2 0-4% by weight, MgO 0-4% by weight, CaO 0-4% by weight, BaO 0-4% by weight, Sb2O3 0-4% by weight, CeO2 0-8% by weight.La invención se relaciona con un obturador para producir partes modeladas dentales que consiste totalmente de vidrio poroso sin material cristalino, la densidad del obturador está en la variación de aproximadamente 50% hasta 95% de su densidad teórica. Tiene una forma similar a disco que tiene un diámetro de al menos 20 mm. El obturador se produce mediante un proceso en el cual polvo de vidrio en primer lugar se comprime a una presión en la variación de 10 MPa hasta 300 MPa y este cuerpo no sinterizado se (pre)sinteriza a una temperatura en la variación de 580°C hasta 750°C para proporcionar un obturador compuesto de vidrio poroso sin material cristalino. Las partes modeladas dentales monolíticas se pueden obtener a partir del obturador resultante mediante torneado mecánico y una sinterización posterior, con un proceso de acu
