High strength lithium silicate glass ceramic having high shielding property

Patent metadata

Field	Value
Publication number	US-11414340-B2
Application number	US-201816148033-A
Country	US
Kind code	B2
Filing date	Oct 1, 2018
Priority date	Oct 2, 2017
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

To provide An Al2O3-free dental lithium silicate glass composition comprising the following components:SiO2: 60.0 to 80.0% by weightLi2O: 10.0 to 17.0% by weightK2O: 0.5 to 10.0% by weighta nucleating agent: 1.0 to 6.0% by weighta colorant: 0.0 to 10.0% by weight, and,a metal oxide Me(tetravalent)O2: 5.0 to 10.0% by weight.

First claim

What is claimed is:

1. An Al 2 O 3 -free dental lithium silicate glass composition consisting of the following components:
SiO 2 : 60.0 to 80.0% by weight,
Li 2 O: 10.0 to 17.0% by weight,
K 2 O: 0.5 to 10.0% by weight,
a nucleating agent: 1.0 to 6.0% by weight,
a colorant: 0.0 to 10.0% by weight, and,
a metal oxide Me(tetravalent)O 2 : 5.0 to 10.0% by weight, wherein
the nucleating agent is at least one selected from a group consisting of P 2 O 5 , WO 3 , V 2 O 5 , Pt and Ag,
the colorant is at least one selected from a group consisting of MnO, Fe 2 O 3 , Tb 4 O 7 , Eu 2 O 3 , Ni 2 O 3 , Cr 2 O 3 , Co 2 O 3 , Nd 2 O 3 , Pr 6 O 11 , Sm 2 O 3 , V 2 O 5 , Dy 2 O 3 , Ho 2 O 3 and Er 2 O 3 , and
the metal oxide Me(tetravalent)O 2 is at least one selected from a group consisting of TiO 2 , ZrO 2 , SnO 2 , HfO 2 , PbO 2 and CeO 2 .

2. A dental lithium silicate glass ceramic comprising a heat treated product of the glass composition according to claim 1 , wherein the precipitate of a lithium metasilicate crystal and/or a lithium disilicate crystal is included as a main crystal phase, and the precipitate of a single crystal and/or a composite crystal of a tetravalent metal oxide is included as a secondary crystal phase.

3. A dental crown restorative material prepared by thermocompression molding, mechanical processing and building up/firing of a glass ceramic obtained by heat treating the glass composition according to claim 1 .

4. A dental crown restorative material prepared by thermocompression molding, mechanical processing and building up/firing of the glass ceramic according to claim 2 .

Assignees

• Shofu Inc

Inventors

• Yamamoto Kazuki
• Takeuchi Daisuke

Classifications

• A61K6/836

  Glass · CPC title

• C03C3/097

  containing phosphorus, niobium or tantalum · CPC title

• C03C4/0021 Primary

  for dental use · CPC title

• C03C3/102

  containing lead · CPC title

• C03C3/078

  containing an oxide of a divalent metal, e.g. an oxide of zinc · CPC title