Title:
DENTAL CERAMIC MATERIAL
Document Type and Number:
Japanese Patent JP3799375
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a dental ceramic material suitable for manufacturing a tooth crown using a ceramic core, and having a low firing temperature, a low expansion factor and high chemical durability.
SOLUTION: In a glass containing, as main components, a silicon oxide, an aluminum oxide, a boron oxide, a zinc oxide, a sodium oxide, and a lithium oxide, expressed in wt.% against the total when converted into SiO2, Al2O2, B2O3, ZnO, Na2O and Li2O, the contents of these components are respectively SiO2: 57 to 67 wt.%, AlO2: 8 to 18 wt.%, B2O2: 15 to 25 wt.%, ZnO: 0.1 to 2 wt.%, Na2O: 3 to 7 wt.%, and Li2O: 2 to 8 wt.%. Especially, the thermal expansion factor of the glass is 6.0×10-6 (1/°C) or lower.
Inventors:
Masato Sekino
Hiroyuki Nakagawa
Osamu Iwamoto
Masaaki Ushioda
Hiroyuki Nakagawa
Osamu Iwamoto
Masaaki Ushioda
Application Number:
JP13783999A
Publication Date:
July 19, 2006
Filing Date:
May 18, 1999
Export Citation:
Assignee:
Tokuyama Corporation
Tokuyama Dental Co., Ltd.
Tokuyama Dental Co., Ltd.
International Classes:
A61C13/083; A61C5/08; A61K6/027; C03C3/093; C03C10/04; (IPC1-7): A61C13/083; A61C5/08; A61K6/027; C03C3/093; C03C10/04
Domestic Patent References:
| JP8119669A |