Dentsply Sirona Inc.

A control unit can receive a digital impression of an oral cavity, receive a selection of a region of interest in the digital impression, determine a size of the region of interest, determine a second reference point in the digital impression, determine a position of a selected region of interest using the first reference point, the second reference point, and the digital impression, control the x-ray detector and the x-ray source to position on opposing sides of the head such that the region of interest can be exposed with an x-ray cone beam, control one or more adjustable shutters to restrict the x-ray cone beam to expose substantially not more than the region of interest, control acquisition of at least one x-ray projection image of the region of interest, and generate an x-ray image using the x-ray projection image or images.

A verification gauge for use in improving the accuracy of a 3D scan. A bar of adjustable length has a first and second ends that can be affixed between two points of the oral-cavity. The bar is scannable and has a visual indicia thereon to verify and determine the length and relative position between the two points.

Light is projected from a light source in a first direction towards a tooth. The light source generates at least infrared light in the wavelength range of 950 nm to 2500 nm. A colloidal quantum dot (CQD) sensor records one or more surface light distribution images produced at the surface of the tooth by the projected light and the one or more surface light distribution images are used to compute a defect condition of the tooth.

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 for generating a two dimensional final image ( 16 ) of at least a sub region of the maxillofacial region of a patient (P) with x-ray cone beam CT, the method comprising the steps of: defining a position and alignment of the 2D final image to be generated relative to said sub region of the dental maxillofacial region of the patient, wherein the 2D final image essentially being identical to a x-ray projection image of said sub region with parallel beam geometry; acquiring a plurality of x-ray projection images by rotating an x-ray source ( 3 ) and an x-ray detector ( 4 ) around the head of the patient, wherein the x-ray source and the x-ray detector are configured for a x-ray cone beam CT image acquisition; varying, during the acquisition step, the amounts of x-ray doses used for the acquisition of each of the x-ray projection images such that a total amount of the x-ray dose is increased above a predetermined level for the x-ray projection images that are acquired when the projection direction is within a first predetermined range of angles (a) centered about a first direction which is parallel to the normal direction of the 2D final image to be generated, and a total amount of the x-ray dose is reduced below the predetermined level for the x-ray projection images that are acquired when the projection direction is within a second predetermined range of angles (b) centered about a second direction which is perpendicular to the normal direction of the 2D final image to be generated; generating the 2D final image as a virtual projection with parallel x-ray beam geometry of the sub region of the maxillofacial region of a patient by using the x-ray projection images acquired.

A system generates panoramic images of a patient from multiple two-dimensional x-ray projection images. The system includes an x-ray source, x-ray detector, and x-ray collimator with a variable aperture size. The aperture defines an exposure region on the detector with corresponding variable size. A controller defines a focal curve relative to the patient's oral cavity, following the jawbone shape with molar and incisal regions. The focal curve has predefined thickness exceeding the teeth size to be imaged. The controller acquires images by rotating the source, collimator, and detector around the patient's head along a predefined trajectory, with the collimator positioned between the patient and source. During acquisition, the aperture width continuously varies, using a wider aperture for the molar region and narrower aperture for the incisal region. Simultaneously, the detector's readout region continuously varies horizontally to equal or exceed the variable exposure region size.

A 3D printer comprising a resin vat, a component carrier, a transport box for depositing the component carrier, a transport device for removing the component carrier from the transport box and transporting it into the resin vat, and for moving the component carrier downward and upward in the resin vat. The transport device has translatory axes in the vertical and horizontal directions, each of which can be driven independently by a motor, the transport device having a locking device that detachably connects the component carrier. The locking device, during the downward movement along the vertical translatory axis, reaches a specific position (P) by the drive of the respective motor, at which a stop located on the vertical translatory axis sets a coupling element in motion. A spring-loaded locking pin arranged in contact with the coupling element is immersed in a bayonet opening of the component carrier by the movement. The immersed locking pin can be brought into a locking position in the bayonet opening via the horizontal translatory axis.

A method in which: (a) a patient is positioned in an X-ray device; (b) a 3D scout image with reduced dose and with a predefined volume size and a predefined center of rotation is created; (c) on the 3D scout image, a practitioner marks the tooth (d) a software determines, based on the position of the enveloping geometry, the available centers of rotation and calculates, based on reference points of the enveloping geometry, the imaging positions; (e) based on the imaging positions, a center of rotation is selected; (f) the previously determined aperture positions and the detector regions to be irradiated are transmitted; (g) the high-resolution image is reconstructed and the newly acquired high-resolution information is superimposed in the 3D scout image; (h) the practitioner receives the 3D scout image for diagnosis and further use.

The present invention is related to a curable composition for dental impression comprising: a curable base composition and a surfactant system comprising a first surfactant, which is at least one compound having formula (I) and a fluorotelomer having formula (II), which works synergistically with the fluorotelomer so as to permit the composition to surprisingly have a lower contact angle; these results are reached with relatively low concentrations of biodegradable surfactants.