Multi-layer zirconia dental blank that has a gradual change in chroma and translucency through a thickness after sintering
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A61C-013/00
B32B-018/00
C04B-035/486
A61C-013/08
C04B-035/48
출원번호
US-0559571
(2014-12-03)
등록번호
US-9649179
(2017-05-16)
발명자
/ 주소
Jung, Yunoh
Jung, Daniel Yonil
출원인 / 주소
B & D Dental Corporation
대리인 / 주소
Thorpe, North & Western, LLP
인용정보
피인용 횟수 :
3인용 특허 :
8
초록▼
A dental block for producing a dental prosthesis comprises a green body including zirconia and having a chemical composition including increasing amounts of yttria through a thickness of the green body. The green body is substantially white with a substantially consistent optical characteristic of c
A dental block for producing a dental prosthesis comprises a green body including zirconia and having a chemical composition including increasing amounts of yttria through a thickness of the green body. The green body is substantially white with a substantially consistent optical characteristic of chroma across the thickness, and is subsequently millable and sinterable to form the dental prosthesis with an optical characteristic of decreasing chroma through a thickness of the dental prosthesis.
대표청구항▼
1. A dental block device for producing a dental prosthesis, the dental block device comprising: a) a green body comprising zirconia;b) the green body having multiple different areas each having a different chemical composition between adjacent areas; andc) the green body having a pre-sintered transl
1. A dental block device for producing a dental prosthesis, the dental block device comprising: a) a green body comprising zirconia;b) the green body having multiple different areas each having a different chemical composition between adjacent areas; andc) the green body having a pre-sintered translucency that is substantially the same across the multiple different areas, and a pre-sintered color intensity/chroma that is substantially the same across the multiple different areas, and the green body having a post-sintered translucency and a post-sintered color intensity/chroma with an inverse relationship with the post-sintered translucency increasing in one direction across the multiple different areas and the post-sintered color intensity/chroma decreasing in the same direction across the multiple different areas. 2. The device in accordance with claim 1, wherein the green body has a color component. 3. The device in accordance with claim 1, wherein the green body is without a color component. 4. The device in accordance with claim 1, wherein the different chemical composition includes different amounts of yttria between the adjacent areas. 5. The device in accordance with claim 4, wherein the amount of yttria is increased incrementally from a lower areas to an upper area of the dental prosthesis. 6. The device in accordance with claim 4, wherein the amount of yttria is increased incrementally from 4.5-6 wt % in the lower area to 6-10 wt % in the upper area. 7. The device in accordance with claim 1, wherein the green body is substantially white. 8. The device in accordance with claim 1, wherein the green body is substantially opaque and substantially non-translucent with respect to visible light. 9. The device in accordance with claim 1, wherein the green body has a brightness/lightness L* value between 10 to 20 for a sample thickness of 1 to 1.3 mm in accordance with CIE L*a*b* colorimetric system, measured with a reading tip of a spectrophotometer flush with, in close touching contact, and perpendicular to a measured surface of a sample. 10. The device in accordance with claim 1, wherein the green body is subsequently colorable to form the dental prosthesis with the multiple different areas having optical characteristics of a decreasing color intensity/chroma level in one direction and an increasing translucency in the same direction after dipping in a color liquid and sintering. 11. The device in accordance with claim 1, wherein the multiple different areas have different thicknesses with respect to one another with a lower area, corresponding to a cervical area of the dental prosthesis, having a thickness between 2-5 min; and an upper area, corresponding to the occlusal area of the dental prosthesis, having a thickness between 0.5-2 mm. 12. A dental block device for producing a dental prosthesis, the dental block device comprising: a) a green body comprising zirconia without color component;b) the green body having multiple different areas each having a different chemical composition between adjacent areas;c) the different chemical composition including different amounts of yttria between the adjacent areas;d) the amount of yttria is increased incrementally from 4.5-6 wt % in a lower area to 6-10 wt % in an upper area; ande) the green body having a pre-sintered translucency that is substantially the same across the multiple different areas, and a pre-sintered color intensity/chroma that is substantially the same across the multiple different areas, and the green body having a post-sintered translucency and a post-sintered color intensity/chroma with an inverse relationship with the post-sintered translucency increasing in one direction across the multiple different areas and the post-sintered color intensity/chroma decreasing in the same direction across the multiple different areas. 13. The device in accordance with claim 12, wherein the green body has a brightness/lightness L* value between 10 to 20 for a sample thickness of 1 to 1.3 mm in accordance with CIE L*a*b* colorimetric system, measured with a reading tip of a spectrophotometer flush with, in close touching contact, and perpendicular to a measured surface of a sample. 14. The device in accordance with claim 12, wherein the green body is substantially white. 15. The device in accordance with claim 12, wherein the green body is substantially opaque and substantially non-translucent with respect to visible light. 16. A dental block device for producing a dental prosthesis, the dental block device comprising: a) a green body comprising zirconia;b) the green body having multiple different areas including a lower area configured to correspond to a cervical area of the dental prosthesis produced from the dental block and an upper area configured to correspond to an incisal area of the dental prosthesis;c) each area having a different chemical composition between adjacent areas, including different amounts of yttria between the adjacent areas, with the amount of yttria increased from the lower area to the upper area; andd) the green body having a pre-sintered translucency that is substantially the same across the multiple different areas, and a pre-sintered color intensity/chroma that is substantially the same across the multiple different areas, and the green body having a post-sintered translucency and a post-sintered color intensity/chroma with an inverse relationship with the post-sintered translucency increasing in one direction across the multiple different areas and the post-sintered color intensity/chroma decreasing in the same direction across the multiple different areas. 17. The device in accordance with claim 16, wherein the green body has a color component. 18. The device in accordance with claim 16, wherein the green body is without a color component; and wherein the green body is substantially white; and wherein the green body is substantially opaque and substantially non-translucent with respect to visible light. 19. The device in accordance with claim 16, wherein the amount of yttria is increased incrementally from 4.5-6 wt % in the lower area to 6-10 wt % in the upper area. 20. The device in accordance with claim 16, wherein the green body has a brightness/lightness L* value between 10 to 20 for a sample thickness of 1 to 1.3 mm in accordance with CIE L*a*b* colorimetric system, measured with a reading tip of a spectrophotometer flush with, in close touching contact, and perpendicular to a measured surface of a sample.
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이 특허에 인용된 특허 (8)
Engels, Alexander; Hämmerle, Alfred, Block and method of making.
Craig,Bradley D.; Kolb,Brant U.; Oxman,Joel D.; Peez,Robert F.; Frank,Sybille A., Use of nanoparticles to adjust refractive index of dental compositions.
Jung, Yunoh; Jung, Daniel Yonil, Multi-layer zirconia dental blank that has a gradual change in strength, translucency and chroma from one direction to the other after sintering.
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