Creating a translucent effect within one half of a green body zirconia blank
OwnerBenjamin Y. Junginventor
Life of this patent
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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 a chroma component, such as manganese, 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 gray color through a thickness of the dental prosthesis.
Claims12
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;
- c) the green body having a first chroma component in one half of the blank, and a second chroma component in another half of the blank, with the second chroma component not extending into the half with the first chroma component;
- and
- d) the green body being substantially opaque and white.
A dental block device for producing a dental prosthesis, the dental block device comprising:
- a) a green body comprising 60-99.9 wt % zirconia that is soft sintered or pre-sintered;
- b) the green body having at least one of manganese oxide, manganese acetate, manganese chloride, neodymium oxide, copper or cobalt added incrementally towards the area corresponding to an incisal area of the dental prosthesis;
- and
- c) the green body having a brightness/lightness L* value between 10 to 30 for a pre-sintered green body zirconia sample thickness of 1 to 1.3 mm in accordance with CIE L*a*b* colorimetric system wherein, when measured for L* value of a CIE L*a*b* colorimetric system using the VITA Easyshade® Compact spectrophotometer, the L* value of the pre-sintered green body zirconia sample is read with the reading tip of the spectrophotometer to be set flush with, in close touching contact, and perpendicular to the measured surface of the pre-sintered green body zirconia sample.
Dependencies are inferred from the claim text.