Non-Pre-Colored Multi-Layer Zirconia Dental Blank that has a Gradual Change in Translucency through a Thickness After Sintering
First Claim
Patent Images
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 layers each having a different chemical composition between adjacent layers;
c) the different chemical composition including different amounts of yttria between the adjacent layers;
d) the green body being substantially opaque with a substantially consistent optical characteristic of non-translucency with respect to visible light across the layers;
e) the green body having 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; and
f) the green body being subsequently millable and sinterable to form the dental prosthesis with the multiple different layers having different optical characteristics of translucency.
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Abstract
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 opaque with a substantially consistent optical characteristic of non-translucency with respect to visible light across the thickness, and is subsequently millable and sinterable to form the dental prosthesis with an optical characteristic of increasing translucency through a thickness of the dental prosthesis.
67 Citations
19 Claims
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1. A dental block device for producing a dental prosthesis, the dental block device comprising:
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a) a green body comprising zirconia; b) the green body having multiple different layers each having a different chemical composition between adjacent layers; c) the different chemical composition including different amounts of yttria between the adjacent layers; d) the green body being substantially opaque with a substantially consistent optical characteristic of non-translucency with respect to visible light across the layers; e) the green body having 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; and f) the green body being subsequently millable and sinterable to form the dental prosthesis with the multiple different layers having different optical characteristics of translucency. - View Dependent Claims (2, 3, 4, 5)
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6. A dental block device for producing a dental prosthesis, the dental block device comprising:
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a) a green body comprising 60-99.9 wt % zirconia that is soft sintered or pre-sintered without color pigment; b) the green body having a different chemical composition through a thickness of the green body and being substantially opaque with a substantially consistent optical characteristic of non-translucency with respect to visible light through the thickness; c) the different chemical composition including increasing amounts of yttria through the thickness with a lower portion having 4.5-6 wt % yttria and an upper portion having 6-10 wt % yttria; d) the green body having 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; and e) the green body being subsequently millable, colorable and sinterable to form the dental prosthesis with an optical characteristic of increasing translucency through a thickness of the dental prosthesis. - View Dependent Claims (7, 8, 9)
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10. A method for making a dental blank for use in producing a dental prosthesis, the method comprising:
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a) forming zirconia and yttria into a desired shape; b) increasing an amount of yttria through a thickness of the desired shape; and c) pre-sintering or soft sintering the desired shape to form a green body dental blank with a different chemical composition of the amount of yttria through the thickness and being substantially opaque with a substantially consistent optical characteristic of non-translucency with respect to visible light across the thickness, the green body dental blank having 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. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for making a dental a dental prosthesis, the method comprising:
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a) obtaining a green body dental blank including zirconia and having a chemical composition with increasing amounts of yttria through a thickness of the dental blank and being substantially opaque with a substantially consistent optical characteristic of non-translucency with respect to visible light across the thickness, the green body dental blank having 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; b) milling a green body dental prosthesis from the dental blank; c) coloring the green body dental prosthesis; d) sintering the green body dental prosthesis to form the dental prosthesis having an optical characteristic of increasing translucency across the thickness of the dental prosthesis after sintering. - View Dependent Claims (19)
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Specification