GC Corporation

Tokyo, Japan

GC Corporation

Tokyo, Japan
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Patent
GC Corporation | Date: 2017-07-26

An object is to provide a polymerization apparatus for dental technique with which both of preliminary polymerization and final polymerization can be carried out by one apparatus. The apparatus includes a plurality of light sources whose light axes run at least in two directions; a cover that covers the light sources, forms a polymerization space inside thereof and switches a formation and closure of an opening that communicates inside and outside the polymerization space; a sensor that detects the formation and closure of the opening by the cover; a controller that receives signals from the sensor, and based on the formation and closure of the opening, turns on some of the light sources having two or more directions of light axis with the opening closed, and turns on some of the light sources having fewer directions of light axis than with the opening closed, with the opening open.


Patent
GC Corporation | Date: 2017-08-09

An object of the present invention is to provide a method for manufacturing a dental prosthesis capable of properly arranging a dental reinforcement when a dental prosthesis made of resin where the dental reinforcement is arranged is manufactured. The method includes turning information on an intraoral shape into data; designing, in a form of data, a shape of a resin body that is a part formed of resin based on the data; designing, in the form of data, a position of a dental reinforcement that is to be arranged inside the resin body; and forming, in the form of data, a space and an opening that communicates with an outside in the position in the resin body where the dental reinforcement are to be arranged, based on the position, to design a resin body with an opening.


Patent
GC Corporation and Kyushu University | Date: 2017-08-09

An object is to provide a method for manufacturing a calcium carbonate block of no less than 0.1 cm in diameter and thickness, not including any impurities, and able to be employed as a raw material of an artificial bone that requires biosafety: the method includes: (a) shaping a calcium hydroxide block; (b) being exposed to carbon dioxide; and (c) immersing in a carbonate ion containing solution.


Provided is a method for quickly producing a dental prosthesis with a good accuracy. The method for producing a dental prosthesis including: a melting step of melting a material including no less than 60.0 mass % and no more than 80.0 mass % of SiO_(2), no less than 10.0 mass % and no more than 20.0 mass % of Li_(2)O, and no less than 5.1 mass % and no more than 10.0 mass % of Al_(2)O_(3); a glass blank production step of cooling to solidify the molten material to obtain a glass blank; a lithium disilicate blank production step of heating the glass blank to obtain a lithium disilicate blank whose main crystalline phase is lithium disilicate; and a processing step of processing the lithium disilicate by machining.


Patent
GC Corporation and Dental Corp | Date: 2017-02-15

Provided is an artificial tooth that can be unfailingly attached to a denture base in arranging the artificial tooth on the denture base designed and formed with a CAD/CAM, including a convex portion (21a) to be inserted in an internal corner (13a) of a concave portion (13) of the denture base, wherein the convex portion is configured to form a predetermined gap with the internal corner without having contact with the internal corner when inserted in the internal corner.


Patent
GC Corporation | Date: 2017-04-05

Provided is a bite registration tool configured to properly adjust its inclination in taking a bite registration and with which an accurate bite registration can be taken. The bite registration tool includes a rear curved plate that has a curved plate shape and is to be arranged between lips and alveolar ridges of a patient; and a front curved plate that has a plate shape, arranged in a manner that one plate surface faces to the rear curved plate having a predetermined gap, to be arranged forward having contact with the lips, wherein the other plate surface of the front curved plate is provided with at least one ridge protruding and extending in a predetermined direction.


A tool for obtaining a dental occlusion in an edentulous patient has a main body (1) including a rear curved plate (1a) to be positioned at an intraoral buccal of maxillary and mandibular ridges of the edentulous patient, a front curved plate (1b) to be positioned at extraoral upper and lower lips of the edentulous patient, a connecting part (1c) that connects respective intermediate parts of the rear curved plate (1a) and the front curved plate (1b) along a vertical direction, and a through-hole (1d) that penetrates the rear curved plate (1a), the front curved plate (1b), and the connecting part (1c), wherein a position of the main body (1) is fixed in a state in which the connecting part (1c) is held between the upper and lower lips, and an adjusting shaft (2) inserted into the through-hole (1d), and has one end thereof projecting extraorally from a center between the upper and lower lips, and another end which has a tongue support (2a), thereof intraorally holding a tip end of a tongue, wherein the adjusting shaft (2) adjusts a position of the tongue support (2a) to suppress movement of the tongue when obtaining the dental occlusion.


Patent
Gc Corporation | Date: 2015-05-28

Provided is a bite registration tool configured to properly adjust its inclination in taking a bite registration and with which an accurate bite registration can be taken. The bite registration tool includes a rear curved plate that has a curved plate shape and is to be arranged between lips and alveolar ridges of a patient; and a front curved plate that has a plate shape, arranged in a manner that one plate surface faces to the rear curved plate having a predetermined gap, to be arranged forward having contact with the lips, wherein the other plate surface of the front curved plate is provided with at least one ridge protruding and extending in a predetermined direction.


Patent
GC Corporation | Date: 2017-06-14

[Object] To make it possible to firmly fix a mixing tip to a cartridge, and also remove the mixing tip from the cartridge by a simple operation. [Solution Means] A locking member locks a mixing nozzle coupled to a cartridge that includes two syringes, the mixing nozzle being configured to mix materials in a nozzle and discharge the materials, the locking member including a support rod supported by the mixing nozzle so as to be displaceable in a direction orthogonal to a direction in which the nozzle extends; a first engaging part that is engaged with one of two horizontal parts that are provided so as to be bridged across the two syringes; a second engaging part that is inserted in between the two horizontal parts and engaged with another one of the two horizontal parts; and an inclined part where the other end of the support rod is inclined toward the opposite side to the nozzle, the inclined part being provided in at least one of between the first engaging part and the second engaging part and between the second engaging part and the other end of the support rod.


Patent
GC Corporation | Date: 2017-05-03

Provided is a fluoroaluminosilicate glass powder that can provide a dental glass ionomer cement hardened body excellent in acid resistance, the glass powder including sodium and potassium which have an effect of lowering the reflective index of glass. A mass ratio of potassium to sodium in the component is in the range of from 1.2 to 1.9 in terms of oxide.

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