| 摘要 |
PROBLEM TO BE SOLVED: To obtain a sintering lithium disilicate glass ceramic which is formed from specific components, shows optimal fluid flow properties, causes no reaction with the dental investment material, when the ceramic material is compression-molded in its plastic state into a dental product and improve its dimensional stability on heating and chemical stability. SOLUTION: This ceramic contains 57.0-80.0wt.% of SiO2 , 0-5.0wt.% of Al2 O3 , 0.1-6.0wt.% of La2 O3 , 0-5.0wt.% of MgO, 0-8.0wt.% of ZnO, 0-13.5wt.% of K2 O, 11.0-19.0wt.% of Li2 O, 0-11.0wt.% of P2 O5 , 0-8.0wt.% of coloring components, and 0-6.0wt.% of additional components. In this case, (a) Al2 O3 +La2 O3 is 0.1-7.0wt.%, (b) MgO+ZnO is 0.1-9.0wt.%, the coloring substance is (c) a glass- coloring oxides and/or (d) a colored substance and their amounts are 0-5.0wt.% (c) and 0-5.0wt.%, respectively. The additional components are, for example, B2 O3 , F, Na2 O, ZrO2 , BaO and/or SrO. As a component (c), are cited TiO2 , CeO2 and/or Fe2 O3 , while doped ZrO2 is used as a component (d). |
