US2022227663A1PendingUtilityA1
Lithium Silicate-Low Quartz Glass Ceramic
Est. expiryAug 25, 2035(~9.1 yrs left)· nominal 20-yr term from priority
C03C 10/0045C03B 19/066A61C 13/0006A61C 13/0004C03C 10/0027C03C 3/097C03C 4/0021A61K 6/833C03C 3/087C03C 2203/10
73
PatentIndex Score
0
Cited by
0
References
0
Claims
Abstract
Lithium silicate-low quartz glass ceramics are described which are characterized by a combination of very good mechanical and optical properties and can therefore be used in particular as restoration material in dentistry.
Claims
exact text as granted — not AI-modified1 . Lithium silicate-low quartz glass ceramic, which comprises lithium silicate as main crystal phase and low quartz as further crystal phase.
2 . Glass ceramic according to claim 1 , which comprises 59.0 to 79.0 wt.-% SiO 2 .
3 . Glass ceramic according to claim 1 , which comprises 8.0 to 15.0 wt.-% Li 2 O.
4 . Glass ceramic according to claim 1 , which comprises 0 to 9.0 wt.-% P 2 O 5 .
5 . Glass ceramic according to claim 1 , which comprises 1.0 to 8.0 wt.-% oxide of monovalent elements Me I 2 O selected from the group of K 2 O, Na 2 O, Rb 2 O, Cs 2 O and mixtures thereof.
6 . Glass ceramic according to claim 1 , which comprises 1.0 to 9.0 wt.-% oxide of divalent elements Me II O selected from the group of CaO, MgO, SrO, ZnO and mixtures thereof.
7 . Glass ceramic according to claim 1 , which comprises 1.0 to 6.0 wt.-% MgO.
8 . Glass ceramic according to claim 1 , which comprises 0 to 8.0 wt.-% oxide of trivalent elements Me III 2 O 3 selected from the group of Al 2 O 3 , B 2 O 3 , Y 2 O 3 , La 2 O 3 , Ga 2 O 3 , In 2 O 3 and mixtures thereof.
9 . Glass ceramic according to claim 1 , which comprises 1.0 to 6.0 wt.-% Al 2 O 3 .
10 . Glass ceramic according to claim 1 , which comprises at least one of the following components in the amounts specified:
Component
wt.-%
SiO 2
59.0 to 79.0
Li 2 O
8.0 to 15.0
P 2 O 5
0 to 9.0
MeI 2 O
1.0 to 8.0
MeIIO
1.0 to 9.0
MeIII 2 O 3
0 to 8.0
MeIVO 2
0 to 10.0
MeV 2 O 5
0 to 8.0
MeVIO 3
0 to 5.0
fluorine
0 to 1.0,
wherein
Me I 2 O is selected from the group of K 2 O, Na 2 O, Rb 2 O, Cs 2 O and mixtures thereof,
Me II O is selected from the group of CaO, MgO, SrO, ZnO and mixtures thereof,
Me III 2 O 3 is selected from the group of Al 2 O 3 , B 2 O 3 , Y 2 O 3 , La 2 O 3 , Ga 2 O 3 , In 2 O 3 and mixtures thereof,
Me IV O 2 is selected from the group of ZrO 2 , TiO 2 , SnO 2 , CeO 2 , GeO 2 and mixtures thereof,
Me V 2 O 5 is selected from the group of V 2 O 5 , Ta 2 O 5 , Nb 2 O 5 and mixtures thereof, and
Me VI O 3 is selected from the group of WO 3 , MoO 3 and mixtures thereof.
11 . Glass ceramic according to claim 1 , which comprises at least one of the following components in the amounts specified:
Component
wt.-%
SiO 2
59.0 to 79.0
Li 2 O
8.0 to 15.0
P 2 O 5
0 to 9.0
K 2 O
0 to 5.0
Na 2 O
0 to 2.0
Rb 2 O
0 to 8.0
Cs 2 O
0 to 7.0
CaO
0 to 3.0
MgO
0 to 6.0
SrO
0 to 4.0
ZnO
0 to 9.0
Al 2 O 3
1.0 to 6.0
B 2 O 3
0 to 4.0
Y 2 O 3
0 to 5.0
La 2 O 3
0 to 5.0
Ga 2 O 3
0 to 3.0
In 2 O 3
0 to 5.0
ZrO 2
0 to 3.0
TiO 2
0 to 4.0
SnO 2
0 to 3.0
GeO 2
0 to 9.0
CeO 2
0 to 4.0
V 2 O 5
0 to 2.0
Ta 2 O 5
0 to 5.0
Nb 2 O 5
0 to 5.0
WO 3
0 to 3.0
MoO 3
0 to 3.0
fluorine
0 to 1.0.
12 . Glass ceramic according to claim 1 , which comprises SiO 2 and Li 2 O in a molar ratio in the range of from 2.2 to 4.1.
13 . Glass ceramic according to claim 1 , which comprises lithium disilicate or lithium metasilicate as main crystal phase.
14 . Glass ceramic according to claim 1 , which has at least 20 wt.-% lithium disilicate crystals.
15 . Glass ceramic according to claim 1 , which has 0.2 to 28 wt.-% low quartz crystals.
16 . Glass ceramic comprising lithium silicate as main crystal phase and low quartz as further crystal phase or starting glass comprising nuclei for the crystallization of lithium metasilicate, lithium disilicate and/or low quartz, wherein the glass ceramic and the starting glass are present in the form of a powder, a granulate, a blank or a dental restoration.
17 . Process for the preparation of the glass ceramic according to claim 1 , in which a starting glass is subjected to at least one heat treatment in the range of 700 to 900° C.
18 . Process according to claim 17 , in which
(a) the starting glass is subjected to a heat treatment at a temperature of 400 to 600° C. in order to form a starting glass with nuclei for the crystallization of lithium metasilicate, lithium disilicate and/or low quartz, and (b) the starting glass with nuclei is subjected to a heat treatment at a temperature of 700 to 900° C. in order to form the lithium silicate-low quartz glass ceramic.
19 . Process of using the glass ceramic according to claim 1 as dental material, for coating dental restorations or for the preparation of dental restorations.
20 . Process for the preparation of a dental restoration comprising a bridge, inlay, onlay, veneer, abutment, partial crown, crown or facet, in which the glass ceramic according to claim 1 is given the shape of the desired dental restoration by pressing or machining.Join the waitlist — get patent alerts
Track US2022227663A1 — get alerts on status changes and closely related new filings.
We store only your email — no account needed. See our privacy policy.