Indirect restoration technology
First Claim
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1. A dental restoration comprising:
- a lithium silicate translucent glass heated and pressed onto a metal alloy substrate, the latter being shaped to conform to a base impression or scan of the relevant portion of the mouth, the lithium silicate being shaped to replicate the dental structure being restored;
the coefficient of thermal expansion of the metal alloy being selected to be slightly greater than the CTE of the lithium silicate glass ceramic.
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Abstract
Dental restorations such as crowns, are made from lithium silicate glass ceramic that is heated and pressed onto a metal substrate, the latter being shaped to an impression or scan of the area of the mouth to receive the restoration. The metal substrate is made from an alloy selected to exhibit a coefficient of thermal expansion which is slightly greater than the CTE of the lithium silicate. In a preferred embodiment, the CTE of the lithium silicate glass ceramic is in the range of 11.5 to 12.5 and the alloy is selected to have a CTE of 12 to 13.5. A palladium tin alloy provides that CTE in the preferred embodiment.
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Citations
10 Claims
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1. A dental restoration comprising:
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a lithium silicate translucent glass heated and pressed onto a metal alloy substrate, the latter being shaped to conform to a base impression or scan of the relevant portion of the mouth, the lithium silicate being shaped to replicate the dental structure being restored; the coefficient of thermal expansion of the metal alloy being selected to be slightly greater than the CTE of the lithium silicate glass ceramic. - View Dependent Claims (2, 3, 4, 5)
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6. A process of fabricating a dental restoration;
- the method comprising the steps of;
a) forming a block of lithium silicate glass of selected color and texture; b) preparing a metal alloy substrate having geometric compatibility with a tooth to be restored; c) inserting the glass blank into the substrate; d) heating the glass; and e) pressing the heated glass into a shape replicating the surface of the tooth. - View Dependent Claims (7, 8, 9, 10)
- the method comprising the steps of;
Specification