Kuraray Noritake Dental Inc.

Noritake Co., Ltd.

Yoshihisa Ito

Atsushi Matsumoto

Yoshihisa Yamada

Tetsuo Yamada

Yasutaka Kudo

Shinichiro Kato

Hiroyuki Sakamoto

Tomohiro Emoto

Shinji Kato

Naofumi Murata

Kiyoko Ban

Hiroshi Inada

Yusuke Kondo

Atsushi Matsuura

Sho Ito

Provided are a workpiece unit in which a holding member is attached to a workpiece body without use of an adhesive, and a method of producing the unit. The workpiece unit comprises a workpiece body, and a holding member which is arranged at at least a part of an outer circumferential portion of the workpiece body and directly contacts with at least a part of the outer circumferential portion.

Workpiece unit and method of producing same

Provided are: a workpiece unit () that makes it possible to attach a holding member () to a workpiece body () at a suitable position and that minimizes displacement of the holding member () after attachment thereof; and a method for producing the workpiece unit (). The workpiece unit () is provided with a workpiece body () and a holding member () arranged on at least a part of the outer circumference () of the workpiece body (). The workpiece body () comprises at least one first positioning section () at a part facing the holding member (). The holding member () comprises a second positioning section () that engages with at least a part of the first positioning section ().

Workpiece unit and producing method thereof

A zirconia sintered body may excel in translucency, strength, in linear light transmittance, and can be produced by short-time sintering without an HIP device, and be used in zirconia molded bodies and pre-sintered bodies from which such a zirconia sintered body can be obtained. A zirconia molded body with zirconia particles and 2.0 to 9.0 mol % yttria, having an average primary particle diameter less than 60 nm, and a monoclinic crystal system in a fraction of ≥55%. The zirconia molded body may have ≥1% undissolved yttria. A zirconia pre-sintered body may have such zirconia particles, wherein the zirconia pre-sintered body has ΔL*(W−B) of ≥5 through a thickness of 1.5 mm. A zirconia sintered body may have a fluorescent agent and 2.0 to 9.0 mol % yttria, and a crystal grain size of ≤180 nm.

Zirconia molded body and pre-sintered body capable of being sintered in short time

A zirconia pre-sintered body suitable for dental milling, grinding and/or cutting can provide a sintered body in which the strength between layers of powders is improved. A flexural strength of a test sample of the zirconia sintered body, measured pursuant to JISR1601, is preferably not less than 1000 or 1100 MPa.

Zirconia sintered body, zirconia composition, zirconia pre-sintered body and dental prosthesis

A zirconia sintered body is provided in which the strength between layers of powders is improved. A flexural strength of a test sample of the zirconia sintered body, measured pursuant to JISR1601, is not less than 1000 MPa. The test sample is formed by preparing a plurality of zirconia powders, each containing zirconia and preferably yttria as a stabilizer that suppresses phase transition of zirconia, the zirconia powders differing in a composition, layering the zirconia powders to form a zirconia composition, and sintering the zirconia composition to form a zirconia sintered body. The flexural strength is measured such that a load point is positioned at a boundary of the zirconia powders, the boundary traversing the test sample of the sintered body along a direction of load application.

A mill blank may have a multilayer structure and desirable aesthetics. Such dental mill blanks may include a mill blank portion having a layered structure of two or more layers, and in which the layered structure includes an enamel layer and a core layer, the core layer comprising a first portion that is substantially a frustum, the frustum having a side face forming a part of an interface between the enamel layer and the core layer.

Dental mill blank and dental prosthesis

A coloring device for coloring a dental prosthesis by an inkjet method, the dental prosthesis coloring device includes an inkjet head having a nozzle that ejects ink droplets; a holding unit that holds the prosthesis; a drive unit that moves the inkjet head or the holding unit in a predetermined direction in an XYZ orthogonal coordinate system; and a control unit that controls the inkjet head and the drive unit, wherein the control unit is configured to control the inkjet head and the drive unit based on predetermined coloring data and three-dimensional data of the prosthesis.

Dental prosthesis coloring device, machining apparatus, and coloring method

A composition includes granules in which zirconia particles are aggregated. The granules have an average circularity of 0.81 or greater based on a projected image.

Zirconia composition, partially sintered material and sintered material and methods for production thereof, and laminate

A composition comprises a zirconia powder, in which 55% or more thereof is monoclinic, and a stabilizer capable of suppressing phase transition of zirconia. An average particle diameter of zirconia particles and particles of the stabilizer is 0.06 μm to 0.17 μm. At least a portion of the stabilizer does not form a solid solution with zirconia.

Zirconia composition, pre-sintered body and sintered body, and method of producing the same

The present invention provides a zirconia pre-sintered body that develops the preferable shade with a short firing time. The present invention relates to a zirconia pre-sintered body comprising zirconia that comprises predominantly monoclinic, and a stabilizer capable of inhibiting a phase transformation of zirconia, the zirconia pre-sintered body satisfying the following conditions:

Zirconia pre-sintered body suitable for dental use

Dental block with holder

A composition comprises a zirconia powder, in which 55% or more thereof is monoclinic, and a stabilizer capable of suppressing phase transition of zirconia. An average particle diameter of zirconia particles and particles of the stabilizer is 0.06 &#x3bc;m to 0.17 &#x3bc;m. At least a portion of the stabilizer does not form a solid solution with zirconia.

The present invention provides a mill blank having a multilayer structure and excellent aesthetics, and a method for producing the mill blank. The present invention relates to a mill blank for dental use comprising a mill blank portion having a multilayer structure with two or more layers, wherein the multilayer structure comprises a body layer () inside an enamel layer (), and the body layer () is shaped to comprise a bottom face and a side face, the side face having a portion perpendicular to the bottom face.

Mill blank and dental prosthesis, and methods respectively for producing these products

A workpiece unit including a workpiece body having a protruding portion; and a holding member arranged on at least a part of an outer side of the protruding portion.

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Miyoshi, Japan

Yoshihisa Ito