Dentsply Sirona

The present invention relates to method of generating an x-ray image using an x-ray system (1) comprising an x-ray device (2) which includes: an x-ray detector (4; 14); an x-ray source (3) for emitting a x-ray cone beam; an x-ray collimator (12; 15) having one or more adjustable shutters (25) for setting an aperture (24) for the x-ray radiation; and a first reference point (P1) for positioning a patient's oral cavity. The method comprises the step of: acquiring a digital impression (DI) of the patient's oral cavity; selecting a region of interest (ROI) in the digital impression (DI); determining the size of the region of interest; determining a second reference point (P2) in the digital impression; determining the position of the selected region of interest relative to the x-ray device (2) using the first reference point, the second reference point, and the digital impression; setting the positions of the x-ray detector and the x-ray source on opposing sides of the patient's head so that the region of interest can be exposed with x-ray cone beam radiation and imaged with the x-ray detector; adjusting the shutters (25) so that a size of the aperture (24) restricts the x-ray cone beam to expose substantially not more than the region of interest (ROI) for the set positions of the x-ray detector and the x-ray source; and acquiring at least one x-ray projection image of the region of interest (ROI) at the set positions of the x-ray detector and the x-ray source with the correspondingly adjusted shutters (25); generating an x-ray image by using the x-ray projection images.

The present invention relates to a computer-implemented method for customizing an initial restoration design (1) by a specific user, wherein the initial restoration design (1) is received; wherein a digital 3D model (2) of the dental situation of a patient is received. The method further comprises: a first artificial neural network for machine learning adds a generic offset (3) to each region of the initial restoration design (1) taking into account the digital 3D model (2), and outputs the result to a second artificial neural network for machine learning; the second artificial neural network for machine learning adds a user-specific offset (4) to each region of the output of the first artificial neural network taking into account the 3D digital model (2), and outputs the result to a specific user; wherein the specific user, using CAD tools, revises via a display unit the output of the second artificial neural network taking into account the 3D digital model (2) to produce a final restoration design (5); wherein the first artificial neural network is trained using a first training data set, the first training data set including the initial restoration designs (1), the 3D digital models (2), and the final restoration designs (5) produced by at least other users; and wherein the second artificial neural network is trained using a second training data set, the second training data set including initial restoration designs (1), the digital 3D models (2), and final restoration designs (5) produced by the specific user only.

The present invention relates to a computer implemented method of generating a panoramic image of a patient (P), comprising: a step of defining a focal curve (F) relative to the patient's oral cavity (O), wherein the focal curve (F) follows the shape of the jawbone (1) of the patient (P), wherein the focal curve (F) has a predefined thickness (L) which includes at least the teeth (T) to be imaged; a step of acquiring a plurality of two dimensional x-ray projection images of the patient (P) along the focal curve (F) by means of rotating an x-ray source (3), an x-ray collimator (12) and a flat panel x-ray detector (4) around the patient's head in accordance with a predefined trajectory relative to the patient (P), wherein the x-ray collimator (12) is positioned between the patient's head and the x-ray source (3), wherein the collimator (12) has an x-ray aperture (13) to restrict the x-ray cone beam angle, wherein the width of the x-ray aperture (13) is adjustable for varying the x-ray cone beam angle. In the acquisition step, the width of the aperture (13) is continuously varied such that the width of the aperture (13) used to expose the molar region (M) of the focal curve (F) is larger than the width of the aperture (13) used to expose to the incisal region (I); and in the acquisition step, the readout region (R) of the x-ray detector (4) is continuously varied in the horizontal direction such that the readout region (R) of the x-ray detector (4) is equal to or larger that the region of the x-ray detector (4) being actively exposed through the aperture (13).

The present invention relates to a polymerizable dental composition comprising a specific monomeric system containing at least a specific high viscosity performer monomer and a specific low viscosity thinner monomer with similar refractive indices. The present invention also relates to the use of the specific monomeric system for the preparation of a crosslinked dental composition. Finally, the present invention relates to the use of a specific compound for stabilizing a polymerized dental composition.

Techniques and apparatuses are described that perform x-ray device calibration and imaging. In an example aspect the techniques and apparatuses include techniques and apparatuses to calibrate an x-ray device by performing a generalized calibration routine that is applicable to any rotation center of the x-ray device to measure calibration parameters of the x-ray device that describe at least mechanics of the x-ray device, imaging a volume by projecting an x-ray beam through the volume onto a detector based on a desired scanning trajectory or the calibration parameters to produce a plurality of x-ray images, generating an estimated projection geometry corresponding to the imaging using the calibration parameters and the desired scanning trajectory, and generating a reconstruction of the volume corresponding to the plurality of x-ray images using the estimated projection geometry and a motion artefact compensation.

The invention relates to a system for displaying visual content, comprising at least one output device, and at least one controller, and at least one input device, wherein the visual content comprises features comprising a color scheme and/or at least one color group, the output device is configured to display the visual content, the controller is configured to generate a first visual test comprising at least one first test image, and to allow displaying the visual content on the output device if a user correctly identifies an object in the first test image, and to deny displaying the visual content on the output device if the user fails to correctly identify the object in the first test image, the input device is configured to receive input by the user to identify the object in the first test image. The invention is characterized in that the first test image is generated using features and/or expected features of the visual content.

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …