公开(公告)号：US20220207794A1

公开(公告)日：2022-06-30

申请号：US17604045

申请日：2020-04-17

Applicant: DENTSPLY SIRONA Inc. ,  SIRONA DENTAL SYSTEMS GMBH

Inventor： Christina SARTI ,  Kai STANNIGEL ,  Michael ELVERS

IPC: G06T11/00

Abstract: The present invention relates to a method of metal artefact reduction in x-ray dental volume tomography, the method comprising: a step (S1) of obtaining two-dimensional x-ray images (1) or a sinogram (2) of at least part (v) of a patient jaw (3a), acquired through relatively rotating an x-ray source (4) and a detector (5) around the patient jaw (3a); the method being characterized by further comprising: a step (S2) of detecting metal objects (6) in the two-dimensional x-ray images (1) or the sinogram (2) by using at least a trained artificial intelligence algorithm to generate 2D masks (7) which represent the metal objects (6) in the two-dimensional x-ray images (1) or 3D masks which represent the metal objects (6) in the sinogram (2), respectively; and a step (S4; S5) of reconstructing a three dimensional tomographic image (8) respectively based on two-dimensional x-ray images (1) or the sinogram (2) and the 2D masks (7) or the 3D masks as generated.

公开(公告)号：US20220192616A1

公开(公告)日：2022-06-23

申请号：US17440358

申请日：2020-02-25

Applicant: DENTSPLY SIRONA inc. ,  SIRONA DENTAL SYSTEMS GMBH

Inventor： Stefan EICHNER ,  Markus HÜLSBUSCH

IPC: A61B6/00 ,  A61B6/03

Abstract: The invention relates to a method for producing a panoramic tomographic image (1, 11, 60) of an object (2) to be recorded using a 2D panoramic X-ray device (3), in the course of which X-rays (4) produced by means of an X-ray source (5) irradiate the object (2) and are acquired by means of an X-ray detector (7), wherein, during a movement of the X-ray source (5) and the X-ray detector (7) around the object (2), a number of 2D X-ray projection images (30) are acquired from different acquisition directions (6). A first panoramic tomographic image (1) is calculated from the acquired 2D X-ray projection images (30) using a reconstruction method, wherein the acquired 2D X-ray projection images (30) are modified using a modification method, wherein, from the modified 2D X-ray projection images (40, 50) and using the reconstruction method, a second panoramic tomographic image (11) is calculated with a higher weighting of artifacts (20) relative to anatomical structures (17, 18, 19), wherein a third panoramic tomographic image (60) with significantly reduced artifacts is calculated.

公开(公告)号：US20210393369A1

公开(公告)日：2021-12-23

申请号：US17292823

申请日：2019-11-13

Applicant: DENTSPLY SIRONA INC. ,  SIRONA DENTAL SYSTEMS GMBH

Inventor： Siegfried GOISSER ,  Stefan GÖBEL

IPC: A61C1/05 ,  A61C1/18

Abstract: A dental turbine driven by pressurized air comprises a head housing (1) with a turbine chamber (2) and a rotor shaft (3) mounted using an anti-friction bearing (8a) with a non-rotatably mounted turbine wheel (13). The outer race (10a) of the anti-friction bearing (8a) extends into the turbine chamber (2) in axial direction. The turbine wheel (13) comprises an annular web (16a) that is arranged concentrically to the outer race (10a) of the anti-friction bearing (8a) and, together with the outer race (10a), forms a gap seal (17a). This gap seal (17a) extends in axial direction between outer race (10a) and annular web (16a) and prevents the sucking-in of liquids and dirt particles into the turbine chamber (2) during inertial rotation of the turbine wheel (13).

公开(公告)号：US20210000573A1

公开(公告)日：2021-01-07

申请号：US16767746

申请日：2018-11-28

Applicant: SIRONA DENTAL SYSTEMS GMBH

Inventor： Sascha Schneider ,  Peter Fornoff

IPC: A61C13/00 ,  A61C8/02 ,  A61C8/00 ,  A61C13/083

Abstract: The present invention relates to a dental prosthesis molding block (10) for producing a dental prosthesis part. The block comprises an inner material (13) that is at least partially surrounded by an outer material (14), the hardness of which differs from the hardness of the inner material (13). The inner material (13) forms part of a first surface (11) of the dental prosthesis molding block (10). The invention further relates to a method for producing a dental prosthesis part. In said method, a dental prosthesis molding block (10) is provided, and the dental prosthesis part is produced by removing material from the dental prosthesis molding block (10) using a CAD/CAM process. In doing so, a pin having a self-tapping external screw thread is created.

公开(公告)号：US20200163533A1

公开(公告)日：2020-05-28

申请号：US16621287

申请日：2018-06-14

Applicant: SIRONA DENTAL SYSTEMS GMBH

Inventor： Hong-Keun KIM ,  Martin WOHANKA ,  Konrad KLEIN

IPC: A61B1/00 ,  A61B1/24 ,  A61B1/12 ,  A61L31/02

Abstract: The invention relates to a window system for an intraoral scanner. Said window system comprises an optical element having a thermal conductivity of more than 1 W m−1 K−1. A window, which comprises a pane made for example of a plastic, glass, or corundum, is detachably disposed on the optical element at an average distance of less than 1 mm. At least one heat source is also connected to the optical element. The invention further relates to an intraoral scanner. Said intraoral scanner comprises the window system. The optical element and the at least one heat source are connected to the intraoral scanner. The window is disposed in a cover. Said cover can be disposed on the intraoral scanner such that the window has an average distance of less than 1 mm from the optical element.

公开(公告)号：US10165991B2

公开(公告)日：2019-01-01

申请号：US15529529

申请日：2015-11-25

Applicant: SIRONA DENTAL SYSTEMS GMBH

Inventor： Ciamak Abkai ,  Kai Lindenberg ,  Björn Ludwig

IPC: A61B6/00 ,  A61C7/00 ,  A61B6/14

Abstract: The invention relates to an orthodontic diagnostic method wherein at least one initial two-dimensional X-ray image (1) of a first zone (2) of a head (3) is taken. Then at least one three-dimensional X-ray image (4) of a second zone (5) of a dental situation is taken, and the three-dimensional X-ray image (4) is combined with the initial two-dimensional X-ray image (1) using a registration process in order to obtain a full image (8).

公开(公告)号：US10111595B2

公开(公告)日：2018-10-30

申请号：US14410914

申请日：2013-06-25

Applicant: Sirona Dental Systems GmbH

Inventor： Stefan Wundrak ,  Kai Lindenberg

IPC: A61C5/00 ,  A61B5/00 ,  A61B5/055 ,  A61B6/03 ,  A61B6/14 ,  A61C9/00 ,  A61C8/00 ,  A61B6/00 ,  A61C7/00

Abstract: The invention relates to a method for checking tooth positions, wherein an initial three-dimensional volume exposure (1) of teeth (2, 3, 4) to be checked is implemented, wherein the position and orientation of the teeth (2, 3, 4) to be checked are determined based on the initial volume exposure (1); wherein the teeth to be checked are natural teeth (2, 3, 4) comprised of tooth stumps (6, 7, 8) and tooth roots (9, 10, 11) and/or are artificial teeth comprised of artificial tooth stumps and implants; wherein the positional relationship and orientation of the tooth stumps (6, 7, 8) relative to the tooth roots (9, 10, 11) and/or to the implants are determined in particular. For checking, a first optical surface monitoring exposure (25) of the teeth (2, 3, 4) is implemented, wherein using the positional relationship thus determined the position and orientation of the tooth roots (9, 10, 11) and/or of the implants relative to one another and/or relative to a jawbone (5) are determined based on the position of the surfaces (13, 14, 15) of the tooth stumps (6, 7, 8) from the optical surface monitoring exposure (25).

公开(公告)号：US10052182B2

公开(公告)日：2018-08-21

申请号：US15522787

申请日：2015-10-29

Applicant: SIRONA DENTAL SYSTEMS GMBH

Inventor： Thomas Oskam

IPC: A61C13/00 ,  A61C13/08

CPC classification number: A61C13/0004 ,  A61C13/08

Abstract: The invention relates to a method for generating a digital model (6) of a dental replacement part, formed by a dental prosthesis and a prosthesis base having a rear protection plate, and for producing a dental replacement part of this type, wherein, in a digital model (1) of a jawbone to be provided and a digital dental prosthesis model (2) positioned therein, an interface (3) is automatically and/or manually marked in the region of the dental prosthesis model (2), a rear protection plate model (4) is formed by the interface (3), an abutting surface (1′) of the digital jawbone model (1) and a region of a surface (2′) of the dental prosthesis model (2) joining the surface (1′) and the interface (3), a revised dental prosthesis model (5) is formed from the digital dental prosthesis model (2) by adopting the interface (3) as a surface, and the digital model (6) of the dental replacement part is created from the rear protection plate model (4) and the revised dental prosthesis model (5).

公开(公告)号：US20180168782A1

公开(公告)日：2018-06-21

申请号：US15571147

申请日：2016-05-02

Applicant: SIRONA DENTAL SYSTEMS GMBH

Inventor： Paul SCHNITZSPAN ,  Thorsten JORDAN

IPC: A61C13/10 ,  A61C8/00 ,  A61C13/00 ,  A61C13/34 ,  A61C13/01 ,  A61C13/08

CPC classification number: A61C13/1003 ,  A61C8/0048 ,  A61C8/0095 ,  A61C13/0004 ,  A61C13/01 ,  A61C13/082 ,  A61C13/34 ,  G16H20/40

Abstract: Digital design and/or fabrication of a dental prosthesis that includes a gingiva part having retention pockets and corresponding injection channels that extend from the retention pockets to an exterior of the gingiva part. The positioning of a matrix mated to a ball attachment of a dental implant is fixed in the retention pocket by injection of a curable adhesive through the injection channels and into the retention pockets. The location of the retention pockets and the injection channels may be automatically generated by a computer-aided design/computer-assisted manufacturing (CAD/CAM) system. The gingiva part including the retention pockets and injection channels can further be designed and fabricated by the CAD/CAM system.

公开(公告)号：US20180042707A1

公开(公告)日：2018-02-15

申请号：US15552162

申请日：2016-02-19

Applicant: SIRONA DENTAL SYSTEMS GMBH

Inventor： Paul Schnitzspan

IPC: A61C13/00 ,  A61C8/00

CPC classification number: A61C13/0004 ,  A61C8/0018 ,  A61C8/0048 ,  A61C8/0051 ,  A61C8/0069 ,  A61C9/004 ,  A61C13/2255

Abstract: The invention relates to a specimen part (1) for creating a stress-free fit, a so-called passive fit, of implant-supported and/or abutment-supported bridges (2) and bars (3) by means of a CAD/CAM tool for the creation of restorations (5), and to a method for creating a restoration from a digital model (15) of a patient's jaw provided with at least two implants and/or abutments, wherein the model (15) is determined by means of an intraoral scan (14). In order to improve the precision of restorations and to shorten the production process, provision is made that the specimen part (1) per implant (4) and/or abutment has a scannable structure (6), preferably at a defined distance (7) and angle (8) to the implant (4) and/or abutment. In the method according to the invention, a specimen part (1) is produced from the model (15) by means of CAD/CAM, the specimen part (1) is checked in terms of its dimensional match to at least two implants (4) and/or abutments and if necessary is corrected, the specimen part (1) is scanned, and a digital model (15) of the optionally altered specimen part (1) is generated, which model is used to generate a restoration (16) manufactured by CAD/CAM.