Translucency enhancing solution for zirconia ceramics
US-9872746-B2 · Jan 23, 2018 · US
Methods for enhancing optical and strength properties in ceramic bodies having applications in dental restorations
US11234903B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11234903-B2 |
| Application number | US-202016859132-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 27, 2020 |
| Priority date | Mar 16, 2017 |
| Publication date | Feb 1, 2022 |
| Grant date | Feb 1, 2022 |
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Abstract
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A method for enhancing optical properties of sintered, zirconia ceramic bodies and zirconia ceramic dental restorations is provided. The porous or pre-sintered stage of a ceramic body is treated with two different yttrium-containing compositions and sintered, resulting in sintered ceramic bodies having enhanced optical properties. The enhanced optical properties may be substantially permanent, remaining for the useful life of the sintered ceramic body.
First claim
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We claim: 1. A sintered zirconia ceramic dental restoration comprising a sintered zirconia ceramic body comprising an yttria-stabilized zirconia ceramic material comprising 2 mol % yttria to 5 mol % yttria, having a dental restoration shape comprising an incisal edge and a cervical region, wherein the sintered zirconia ceramic body exhibits an indentation toughness gradient in an incisal region, wherein an indentation toughness increases by at least 1.5 MPa*m 0.5 from the incisal edge to a distance of 3 mm from the incisal edge, toward the cervical region. 2. The sintered zirconia ceramic dental restoration of claim 1 , wherein the indentation toughness increases by at least 2MPa*m 0.5 . 3. The method of claim 1 , wherein the incisal region comprises cobalt. 4. The method of claim 1 , wherein the sintered zirconia ceramic body comprises a cervical region and a middle region that is between the incisal region and the cervical region, wherein an indentation toughness difference between the middle region and the cervical region is less than 1 MPa*m 0.5 .
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Classifications
characterised by the material treated · CPC title
Optical properties, e.g. transparency or reflexibility · CPC title
- A61K6/78Primary
Pigments · CPC title
chlorides · CPC title
Multiple coating or impregnating {multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation} · CPC title
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- What does patent US11234903B2 cover?
- A method for enhancing optical properties of sintered, zirconia ceramic bodies and zirconia ceramic dental restorations is provided. The porous or pre-sintered stage of a ceramic body is treated with two different yttrium-containing compositions and sintered, resulting in sintered ceramic bodies having enhanced optical properties. The enhanced optical properties may be substantially permanent, …
- Who is the assignee on this patent?
- Glidewell James R Dental Ceramics Inc
- What technology area does this patent fall under?
- Primary CPC classification A61K6/78. Mapped technology areas include Human Necessities.
- When was this patent published?
- Publication date Tue Feb 01 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 12 related publications on this page (citations in our corpus or others sharing the same primary CPC).