Abstract: A zirconia sintered body comprises zirconia and multiple different areas, including at least one upper area and at least one lower area having a different chemical composition and a different strength. The sintered body has a translucency and a strength with an inverse relationship. The translucency increases in one direction across the multiple different areas and the strength decreasing in the same direction across the multiple different areas. At least part of the sintered body has a total light transmittance of at least 35% and less than 53% to light with a wavelength at least at a point between 400 nm and 600 nm, and at least 51% and less than 57% to light with a wavelength at least at a point between 600 nm and 800 nm, at a thickness of 0.6 mm. At least a part of the sintered body has a strength of at least 925 Mpa.

Abstract: A dental zirconia system to produce translucent zirconia sintered bodies comprises at least two separate zirconia green bodies. At least one zirconia green body comprises zirconium oxide and a lower content of at least one other oxide summing to between 6.5 wt % to 20 wt % based on a total weight percent of the zirconia green body. At least another zirconia green body comprises zirconium oxide and a higher content of at least one other oxide summing to between 7.5 wt % to 20 wt % based on a total weight percent of the zirconia green body. The at least two zirconia green bodies each have at least some particles with a diameter of 100 nanometers to 1000 nanometers. The at least two zirconia green bodies have different amounts of the at least one other oxide with respect to one another.

Abstract: A method of making a translucent colored zirconia dental restoration comprises obtaining a zirconia green body, forming a dental restoration precursor from the zirconia green body, applying a color liquid to the precursor, and sintering the restoration precursor with regular sintering in air without post HIP processing. The zirconia green body comprises between 7 wt % to 20 wt % of stabilizer based on a total weight percent of the zirconia green body, and at least some particles with a diameter of 100 nanometers to 1000 nanometers. The zirconia green body is subsequently finally sinterable with regular sintering in air without post HIP processing 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.

Abstract: A method of making a translucent colored zirconia dental restoration comprises obtaining a zirconia green body, forming a dental restoration precursor from the zirconia green body, applying a color liquid to the precursor, and sintering the restoration precursor with regular sintering in air without post HIP processing. The zirconia green body comprises between 7 wt % to 20 wt % of stabilizer based on a total weight percent, and an L* value between 10 and 20 for a sample thickness of 1 to 1.3 mm. The zirconia green body is subsequently finally sinterable with regular sintering in air without post HIP processing 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.

Abstract: A zirconia ceramic body for use with dental prosthetics has an L* value between 10 and 20 for a sample thickness 011 to 1.3 mm in accordance with CIE L*a*b* colorimetric system. The zirconia ceramic body can have between 6-20 wt % or 7.20 wt % of yttria based on total weight percent of the zirconia ceramic body. The zirconia ceramic body is subsequently finally sinterable to produce a translucent zirconia sintered body. In one aspect, the sintered body has 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.

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 has a substantially consistent optical characteristic of chroma and translucency across the thickness, and is subsequently millable and sinterable to form the dental prosthesis with an optical characteristic of decreasing chroma, increasing translucency, and decreasing strength, in one direction through a thickness of the dental prosthesis.

Abstract: A method of coloring a pre-sintered dental restoration comprises securing a pre-sintered dental restoration having multiple different layers having a different chemical composition of color pigments between adjacent layers; dipping the pre-sintered dental restoration into a coloring liquid, and sintering the pre-sintered dental restoration to acquire a fully sintered ceramic restoration having a translucency and color intensity/chroma with an inverse relationship with the translucency increasing in one direction of the restoration and the color intensity/chroma decreasing in the same direction of the restoration.

Abstract: A method of coloring pre-sintered dental restoration, comprises: securing a pre-sintered dental restoration; applying a preceding liquid on the dental restoration; dipping the dental restoration, with the preceding liquid thereon, into a subsequent liquid for coloring; and sintering the dental restoration to acquire a fully sintered dental restoration. The subsequent liquid is different from the preceding liquid. The preceding liquid at least partly blocks or interferes with an infiltration of the subsequent liquid into an area where the preceding liquid was applied. The fully sintered dental restoration has less color/chroma in the area where the preceding liquid was applied.

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.

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 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.

Abstract: A dental cutting system and method for cutting a patient's tooth includes a hand piece to be held and carrying a cutting burr to cut the patient's tooth. A plurality of guide pins is attached to and extends from the hand piece of the cutting tool remote from the cutting bur. One or more cutting guides each have a cavity coinciding with at least a portion of teeth inside a patient's mouth that are adjacent to or remote from the patient's tooth to be cut. The guide pins of the handpiece slide in slots in the cutting guide to guide the cutting burr to cut the patient's tooth.

Abstract: A method for creating a substantially accurate dental restoration from scanning a negative dental impression of a patient's teeth or a positive dental stone model of the patient's teeth includes applying a compensation rate to compensate for the shrunk or enlarged scan of the patients teeth, to the scan of the patient's teeth using the scanner to create a true dimension working file; the scan of the patient's teeth using a computer system to create a true dimension working file; or a shrunk restoration file of the restoration using a restoration fabricator. A restoration can be designed based on the scan of the patient's teeth and creating a restoration file. The restoration can be fabricated using a restoration fabricator.