Abstract: Disclosed are example embodiments of a milling bur specifically designed to mill a dental prosthesis from a full-sintered zirconia blank. The milling bur comprises a milling tip configured to have a factor of safety of at least 2 by having a first coverage-percentage of grinding particles covering a surface area of the tip of the milling bur. The factor of safety is a number of time the milling bur can fully mill a dental prosthesis from a fully-sintered zirconia blank.
Type:
Grant
Filed:
September 10, 2020
Date of Patent:
August 22, 2023
Assignee:
James R. Glidewell Dental Ceramics, Inc.
Inventors:
Marco A. Jokada, Vaheh Golestanian Nemagrdi, Kenad Destanovic, Marshall L. Fernald, David C. Leeson
Abstract: Methods and apparatus are provided for increasing the rate of casting ceramic bodies from a slurry or suspension. Methods and apparatus are successfully used for casting ceramic bodies from micron-sized zirconia ceramic at an accelerated rate. Methods described herein may also be used for casting ceramic bodies from nano-sized zirconia ceramic. The casting apparatus may be configured for use in a plurality of operational modes. Ceramic bodies produced by the methods and apparatus are suitable for use in dental applications.
Type:
Grant
Filed:
January 28, 2021
Date of Patent:
August 22, 2023
Assignee:
James R. Glidewell Dental Ceramics, Inc.
Abstract: A computer-implemented method, system, and instructions can include receiving a reconstructed volume of an object; determining an air density and a material density from the reconstructed volume of the object; subdividing the reconstructed volume into one or more blocks, each block comprising one or more voxels; determining one or more contrast blocks within the reconstructed volume; and determining a reconstruction quality based on the number of contrast blocks in the reconstructed volume.
Type:
Grant
Filed:
March 31, 2021
Date of Patent:
August 8, 2023
Assignee:
James R. Glidewell Dental Ceramics, Inc.
Abstract: Antimicrobial polymer composite materials are disclosed that are suitable for making oral devices used in dental applications, such as denture bases. Acrylic resin composite materials comprising antimicrobial polymers and antimicrobial fillers provide reduction in common oral microorganisms after long-term aging, with reduced release rate of antimicrobial agents from the composite material. Antimicrobial polymers are prepared from compositions comprising acrylate and/or methacrylate monomers and polymerizable quaternary ammonium silicon-containing compounds.
Type:
Grant
Filed:
July 22, 2020
Date of Patent:
July 25, 2023
Assignee:
James R. Glidewell Dental Ceramics, Inc.
Inventors:
Maggie Xiaoxia Liu, Bharathy Thaiyalan, Reid Baker, Nicole Lee Miller
Abstract: Translucency of a yttria-stabilized zirconia ceramic is improved to achieve even higher translucency than what is currently offered on the market, without greatly altering its mechanical properties. The enhancement is done by incorporating magnesium-containing dopants into the microstructure of yttria-stabilized zirconia ceramic dental ceramics.
Type:
Application
Filed:
December 22, 2022
Publication date:
June 29, 2023
Applicant:
James R. Glidewell Dental Ceramics, Inc.
Inventors:
May Yun Hsuan Lin, Yan Yang, Sreeram Balasubramanian, Hugo Gonzalez, Dimple Pradhan
Abstract: A method for making a ceramic body comprised of a ceramic material having an inhibitory effect on bacterial growth is provided. A dental prosthesis may be made of a ceramic material that comprises a molybdenum-containing component on a portion of the prosthesis that contacts the gingival surface of a patient. In one method, a porous zirconia ceramic structure is shaped in the form of a dental prosthesis, and then infiltrated with a molybdenum-containing composition, before sintering to densify the ceramic structure.
Type:
Grant
Filed:
April 11, 2022
Date of Patent:
June 27, 2023
Assignee:
James R. Glidewell Dental Ceramics, Inc.
Abstract: A system and method can determine one or more CT scanner calibration parameters from a plurality of calibration object projections in a plurality of radiographs.
Type:
Application
Filed:
February 16, 2023
Publication date:
June 22, 2023
Applicant:
James R. Glidewell Dental Ceramics, Inc.
Inventors:
Sergey Nikolskiy, Fedor Chelnokov, Grant Karapetyan
Abstract: A method is provided for shaping a custom anterior dental restoration from a preform, wherein the preform comprises a preform body and a preform stem. A method is further disclosed for generating one or more nesting positions for the restoration design within the geometry of the preform body relative to the position of the preform stem. A method is further disclosed for generating machining instructions based on the selected nesting position to optimize machining for chair-side applications.
Type:
Application
Filed:
January 30, 2023
Publication date:
June 8, 2023
Applicant:
James R. Glidewell Dental Ceramics, Inc.
Inventors:
Marco Antonio Jokada, David Christopher Leeson, Vaheh Golestanian Nemagrdi, Prabhakar Thirugnanasambandam, Kenad Destanovic
Abstract: Computer-implemented method and system automatically detects an out-of-view CT scan by receiving a voxel density file, determining a threshold iso-value of density between air density and a material density of one or more scanned objects in the voxel density file, and evaluating, using the threshold iso-value of density, one or more horizontal slices of the voxel density file to determine whether at least a portion of the one or more scanned objects is out of view.
Type:
Application
Filed:
December 22, 2022
Publication date:
April 27, 2023
Applicant:
James R. Glidewell Dental Ceramics, Inc.
Inventors:
Sergey Nikolskiy, Fedor Chelnokov, Grant Karapetyan
Abstract: A computer-implemented method and system of determining a material surface from a volumetric density file includes generating a density frequency distribution of a volumetric density file of a dental impression and determining an iso-value of density between air and a particular material in the density frequency distribution. A computer-implemented method and system of creating a digital model from a CT scan of a physical dental impression includes selecting an iso-value of density for a digital volumetric density file having one or more voxels, generating one or more digital surface points in virtual 3D space for each of one or more voxels, and selecting a subset of digital surface points from the one or more digital surface points. A computer-implemented method and system of optimizing a digital surface includes moving one or more digital surface points to satisfy a criteria of optimum digital surface selection.
Type:
Application
Filed:
December 21, 2022
Publication date:
April 27, 2023
Applicant:
James R. Glidewell Dental Ceramics, Inc.
Abstract: A computer-implemented method and system of automatically detecting and removing extraneous material from a digital dental impression includes detecting one or more dental features in a digital dental impression, filtering the one or more dental features, digitally joining the one or more dental features, and determining one or more regions of interest from the joined one or more digital dental features.
Type:
Application
Filed:
December 23, 2022
Publication date:
April 27, 2023
Applicant:
James R. Glidewell Dental Ceramics, Inc.
Abstract: A computer-implemented method of processing a digital dental impression includes determining one or more first digital surface regions visible from a first side of the digital dental impression along an occlusion axis and one or more second digital surface regions visible from a second side of the digital dental impression along the occlusion axis, segmenting the digital dental impression into one or more digital segments and determining the one or more digital segments as a first digital segment or a second digital segment based on the majority of digital surface regions in the one or more digital segments.
Type:
Grant
Filed:
June 25, 2019
Date of Patent:
April 11, 2023
Assignee:
James R. Glidewell Dental Ceramics, Inc.
Abstract: A computer-implemented method of designing a dental restoration at a display includes providing a virtual three dimensional representation of at least a portion of the patient's dental situation. The method includes displaying a library arch form in an alignment with the virtual three dimensional representation of the portion of the patient's dentition. The library arch form includes a pair of two virtual library teeth packing to each other. The method also includes in response to a parametric change of one of the two virtual library teeth, moving the other virtual library tooth to keep packing to the changed virtual library tooth.
Type:
Grant
Filed:
May 20, 2019
Date of Patent:
April 4, 2023
Assignee:
James R. Glidewell Dental Ceramics, Inc.
Abstract: A method for enhancing optical properties of sintered, zirconia ceramic bodies and zirconia ceramic dental restorations is provided. The porous or pre-sintered stage of a ceramic body is treated with an yttrium-containing composition and sintered, resulting in sintered ceramic bodies having enhanced optical properties. The enhanced optical properties may be substantially permanent, remaining for the useful life of the sintered ceramic body.
Type:
Application
Filed:
November 17, 2022
Publication date:
March 16, 2023
Applicant:
James R. Glidewell Dental Ceramics, Inc.
Abstract: A system and method can determine one or more CT scanner calibration parameters from a plurality of calibration object projections in a plurality of radiographs.
Type:
Grant
Filed:
May 29, 2020
Date of Patent:
February 21, 2023
Assignee:
James R. Glidewell Dental Ceramics, Inc.
Inventors:
Sergey Nikolskiy, Fedor Chelnokov, Grant Karapetyan
Abstract: A method is provided for shaping a custom anterior dental restoration from a preform, wherein the preform comprises a preform body and a preform stem. A method is further disclosed for generating one or more nesting positions for the restoration design within the geometry of the preform body relative to the position of the preform stem. A method is further disclosed for generating machining instructions based on the selected nesting position to optimize machining for chair-side applications.
Type:
Grant
Filed:
October 30, 2020
Date of Patent:
January 31, 2023
Assignee:
James R. Glidewell Dental Ceramics, Inc.
Inventors:
Marco Antonio Jokada, David Christopher Leeson, Vaheh Golestanian Nemagrdi, Prabhakar Thirugnanasambandam, Kenad Destanovic
Abstract: Systems and methods are provided for scanning a dental impression to obtain a digital model of a patient's dentition as an input to computer aided design (CAD) and computer aided manufacturing (CAM) methods for producing dental prostheses.
Type:
Grant
Filed:
November 17, 2017
Date of Patent:
January 24, 2023
Assignee:
James R. Glidewell Dental Ceramics, Inc.
Inventors:
Sergey Nikolskiy, David Christopher Leeson, Shih-Kai Lai, Loraine Allessandra Queji Silva