Pre-sintered porcelain block for dental restoration, preparation method therefor and application thereof
AssigneeShenzhen Upcera Dental Technology Co., Ltd.
InventorsLingling He, Guoyi Song, Cheng Hou, Chengwei Han, Zhongliang Zhao, Jialing Li
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Abstract
A pre-sintered porcelain block for dental restoration; the pre-sintered porcelain block does not contain crystal phases and has a Vickers hardness of 0.5-2 GPa. Due to a hardness which is significantly lower than that of the porcelain block containing a lithium metasilicate crystal phase, the pre-sintered porcelain block may be processed by using dry machining and can simultaneously be processed by using wet machining when being mechanically processed into a dental restoration shape.
Claims18
A pre-sintered ceramic block for a dental restoration, wherein the pre-sintered ceramic block comprises following components:
- SiO2:
- 55-85% wt;
- Li2O:
- 10-25% wt;
- ZrO2:
- 0-10% wt;
- Al2O3:
- 0.3-8% wt;
- La2O3:
- 0-7% wt;
- ZnO:
- 0.1-10% wt;
- K2O:
- 0.1-10% wt;
- GeO2:
- 0.1-7% wt;
- a nucleating agent:
- 0-10% wt;
- a colorant:
- 0-10% wt;
- and
- other additives:
- 0-15% wt;
- wherein, the nucleating agent is one of or a combination of at least two of P2O5, TiO2, V2O5, Cr2O3, and Fe2O3;
- the other additives are one of or a combination of at least two of B2O3, F, Na2O, BaO, SrO, CaO, and MgO;
- wherein the pre-sintered ceramic block does not contain a crystal phase,
- has a Vickers hardness of 0.5-2 GPa, and
- is opaque.
A pre-sintered ceramic block for a dental restoration, wherein the pre-sintered ceramic block comprises following components:
- SiO2:
- 55-85% wt;
- Li2O:
- 10-25% wt;
- ZrO2:
- 0-10% wt;
- Al2O3:
- 0.3-8% wt;
- La2O3:
- 0-7% wt;
- ZnO:
- 0.1-10% wt;
- K2O:
- 0.1-10% wt;
- GeO2:
- 0.1-7% wt;
- a nucleating agent:
- 0-10% wt;
- a colorant:
- 0-10% wt;
- and
- other additives:
- 0-15% wt;
- wherein the nucleating agent is one of or a combination of at least two of P2O5, TiO2, V2O5, Cr2O3, and Fe2O3;
- the other additives are one of or a combination of at least two of B2O3, F, Na2O, BaO, SrO, CaO, and MgO;
- wherein the pre-sintered ceramic block does not contain a crystal phase,
- has a Vickers hardness of 0.5-2 GPa,
- is opaque, and
- exhibits a gradual transmittance and/or color after dense-sintering at 800-1100° C.
Dependencies are inferred from the claim text.