Glass ceramic with SiO2 as the main crystalline phase
AssigneeIvoclar Vivadent AG
InventorsMarkus Rampf, Marc Dittmer, Christian Ritzberger, Marcel Schweiger, Wolfram Höland
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Abstract
Glass ceramics having SiO2 as main crystal phase and precursors thereof are described which are characterized by very good mechanical and optical properties and in particular can be used as restoration material in dentistry.
Claims34
Glass ceramic, which comprises the following components
- Component
- wt. %
- SiO2
- 58.0 to 92.0
- Li2O
- 2.0 to 10.0
- Al2O3
- 0 to 10.0
- and comprises SiO2 as main crystal phase and comprises 5.0 to 50.0 wt.-% SiO2 as crystal phase.
Method for the preparation of a glass ceramic, which comprises the following components
- Component
- wt. %
- SiO2
- 58.0 to 92.0
- Li2O
- 2.0 to 10.0
- Al2O3
- 0 to 10.0
- and comprises SiO2 as main crystal phase, in which
- (a) powder of a starting glass comprising 58.0 to 92.0 wt.-% SiO2, 2.0 to 10.0 wt.-% Li2O and 0 to 10.0 wt.-% Al2O3, optionally after the addition of further components, is pressed to form a powder compact, and
- (b) the powder compact is subjected to a heat treatment at a temperature of 700 to 950° C.
Method for the preparation of a dental restoration comprising shaping a glass ceramic, which comprises the following components
- Component
- wt.-%
- SiO2
- 58.0 to 92.0
- Li2O
- 2.0 to 10.0
- and comprises SiO2 as main crystal phase, into the desired dental restoration by pressing, sintering or milling.
Glass ceramic, which comprises the following components
- Component
- wt. %
- SiO2
- 58.0 to 92.0
- Li2O
- 2.0 to 10.0
- Al2O3
- 0 to 10.0
- and comprises SiO2 as main crystal phase and comprises 5.0 to 30.0 wt.-% lithium disilicate as further crystal phase.
Method for the preparation of a glass ceramic, which comprises the following components
- Component
- wt. %
- SiO2
- 58.0 to 92.0
- Li2O
- 2.0 to 10.0
- Al2O3
- 0 to 10.0
- and comprises SiO2 as main crystal phase, which comprises subjecting a starting glass comprising 58.0 to 92.0 wt.-% SiO2, 2.0 to 10.0 wt.-% Li2O and 0 to 10.0 wt.-% Al2O3 to at least one heat treatment at a temperature of from 700 to 950° C. for a period of 5 to 40 min.
Method for the preparation of a dental restoration comprising shaping a glass ceramic, which comprises the following components
- Component
- wt. %
- SiO2
- 58.0 to 92.0
- Li2O
- 2.0 to 10.0
- and comprises SiO2 as main crystal phase, into the desired dental restoration by pressing, sintering or milling, wherein said milling is carried out as part of a CAD/CAM method.
Method for the preparation of a dental restoration comprising shaping a glass ceramic, which comprises the following components
- Component
- wt. %
- SiO2
- 58.0 to 92.0
- Li2O
- 2.0 to 10.0
- and comprises SiO2 as main crystal phase, into the desired dental restoration by milling.
Dependencies are inferred from the claim text.