High translucent dental zirconia blank and sintered body
A dental block for producing a dental prosthesis comprises a green body including zirconia and having a chemical composition comprising between 6.0 wt % to 20 wt % of yttria (Y 2 O 3 ). The green body is subsequently sinterable, with regular sintering in air and with no post HIP processing, to product a translucent sintered body with a total light transmittance of at least 36% to light with a wavelength of 400 nm at a thickness of 0.6 mm.
1. A zirconia green body, comprising:
a) between 7 wt % to 20 wt % of yttria based on a total weight percent of the zirconia green body;
b) at least some particles with a diameter of 100 nanometers to 1000 nanometers;
c) the zirconia green body being subsequently finally sinterable to produce a translucent zirconia sintered body having a total light transmittance of at least 36% and less than 50% to light with a wavelength of 400 nm, and less than 55% to light with a wavelength of 600 nm, at a thickness of 0.6 mm measured using a LAMBDA 35 UV/VIS Spectrophotometer manufactured by Perkin Elmer.
2. The zirconia green body in accordance with claim 1 , wherein a light source to measure the total light transmittance of the zirconia sintered body emits visible light from a halogen lamp.
3. A dental material and restoration obtained by using the zirconia green body as defined in claim 1 .
4. The zirconia green body in accordance with claim 1 , wherein the particles have a size D50 of about 100 nanometers.
5. The zirconia green body in accordance with claim 1 , wherein the particles have a size D50 in the range of about 100 to 1000 nanometers.
6. A zirconia green body, comprising:
a) between 6 to 20 wt % of yttria based on a total weight percent of the zirconia green body;
b) at least some particles with a diameter of 100 nanometers to 1000 nanometers;
c) the zirconia green body being subsequently finally sinterable to produce a translucent zirconia sintered body having a total light transmittance of at least 35% and less than 50% to light with a wavelength of 400 nm, and at least 48% to light with a wavelength of 500 nm, and less than 55% to light with a wavelength of 600 nm, at a thickness of 0.6 mm, measured using a LAMBDA 35 UV/VIS Spectrophotometer manufactured by Perkin Elmer.
7. The zirconia green body in accordance with claim 6 , wherein a light source to measure the total light transmittance of the zirconia sintered body emits visible light from a halogen lamp.
8. A dental material and restoration obtained by using the zirconia sintered green as defined in claim 6 .
9. The zirconia green body in accordance with claim 6 , further comprising:
greater than 99 wt % of the zirconia, the yttria, and hafnia based on the total weight percent of the zirconia green body; and
an amount of the yttria between 6 wt % to 20 wt % based on the total weight percent of the zirconia green body.
10. A zirconia green body with at least some particles with a diameter of 100 nanometers to 1000 nanometers and the zirconia green body being subsequently finally sinterable to produce a translucent zirconia sintered body having a total light transmittance of at least 37% and less than 50% to light with a wavelength of 400 nm, and greater than 47% to light with a wavelength of 500 nm, and less than 55% to light with a wavelength of 600 nm, at a thickness of 0.6 mm, measured using a LAMBDA 35 UV/VIS Spectrophotometer manufactured by Perkin Elmer.
11. The zirconia green body in accordance with claim 10 , wherein a light source to measure the total light transmittance of the zirconia sintered body emits visible light from a halogen lamp.
12. A dental material and restoration obtained by using the zirconia green body as defined in claim 10 .
13. A colored zirconia green body, comprising:
a) greater than 99 wt % of zirconia, yttria and hafnia;
b) greater than 6.0 wt % and less than 20 wt % of yttria based on a total weight percent of the zirconia green body;
c) at least some particles with a diameter of 100 nanometers to 1000 nanometers;
d) a chemical composition with color pigments; and
e) the zirconia green body being subsequently finally sinterable to produce a translucent zirconia sintered body having a total light transmittance of less than 50% to light with a wavelength of 400 nm, and less than 55% to light with a wavelength of 600 nm, and at least 38% to light with a wavelength at a point between 400 nm and 600 nm, at a thickness of 0.6 mm measured using a LAMBDA 35 UV/VIS Spectrophotometer manufactured by Perkin Elmer.
14. The colored zirconia green body in accordance with claim 13 , wherein a light source to measure the total light transmittance of the zirconia sintered body emits visible light from a halogen lamp.
15. A dental material and restoration obtained by using the colored zirconia green body as defined in claim 13 for at least a part of the restoration.
16. The colored zirconia green body in accordance with claim 13 , wherein the colored zirconia green body has multiple zirconia layers with each layer being pre-colored with different levels of color pigments between adjacent layers.