Sirona Dental Systems Gmbh

Dentsply Sirona Inc.

Siemens Aktiengesellschaft

Axel Schwotzer

Joachim Pfeiffer

Volker Schmidt

Frank Thiel

Ulrich Schulze-Ganzlin

Sascha Schneider

Franz Basler

Thomas Hasenzahl

Konrad Klein

A method for designing a drilling template, wherein a dental situation is measured by means of a 3D surface measuring device and a 3D surface model of the dental situation is produced and/or measured by means of an X-ray device or an MRI device, wherein the dental situation is measured and a volume model of the dental situation is produced, the method comprising the steps of: applying an artificial neural network for machine learning (convolutional neural network; CNN) to the 3D surface model of the dental situation and/or the volume model of the dental situation and/or to an initial 3D model of the drilling template; and automatically producing a ready made 3D model of the drilling template.

Method for designing a drilling template

A 3-D camera for obtaining an image of at least one surface of at least one object. The camera comprises a light source, arranged to illuminate the object, wherein a light beam emitted from the light source defines a projection optical path. The camera also includes at least one first aperture having a first predetermined size, interposed in the projection optical path such that the light beam passes through it. An image sensor receives light back-scattered by the object, the back-scattered light defining an observation optical path. At least one second aperture having a second predetermined size, is interposed in the observation optical path such that the back-scattered light passes through it. In one example embodiment of the invention, the first predetermined size is greater than the second predetermined size, and at least one optic is arranged in both the projection and observation optical paths.

Camera for recording surface structures, such as for dental purposes

For the purpose of 3D scanning the surface of an object by optical double triangulation using the phase-shifting method, more particularly for dental purposes, at least two 3D scans of the same object () are carried out at different triangulation angles (&#x3b8;1, &#x3b8;2), the first angle of which is known and the second angle of which is known at least approximately. For each pixel (B) of the phase related image (&#x3c6;1(x,y)), a wave number (wz(x,y) is determined using the second phase related image, the integral portion of which is equal to the order (n) of the uniqueness range (E1) in which the respective pixel (B) is located. The wave number (wz(x,y)) is optimized, at least for a random sample of m pixels (B), by minimizing a non-integral portion of the wave number (wz (x,y)&#x2212;[wz(x,y)]).

Method for 3D, measurement of the surface of an object, in particular for dental purposes

A scanning system for confocal scanning of an object, comprising a light source (), imaging optics () for focusing the light () radiated from the light source () onto the object () to be scanned, and further comprising an image detector () for detecting the light () from an object point () backscattered from the object () and passing through the same imaging optics (). Means () for varying the length of the optical path are disposed in the optical path between the aperture array () and the object (), by which means the optical distance of the image plane can be modified in a specific manner, and means are provided to influence the light () radiated by the light source onto the object () and/or the light () reflected from the object () and impinging on the sensor (), in at least one of its characteristics, during an exposure period (t) for acquiring an image, and, during said exposure period (t), a profile holds which states a specific relationship between the characteristic of the light () and the optical distance of the image plane from the imaging optics (), and means () are provided which provide a measured value dependent on the characteristics of the light of the trajectory of observation () over the exposure period (t), a height coordinate (Z) of the object () being reconstructable from the measured value achieved during said exposure period (t) and a reference value.

Measuring device and method that operates according to the basic principles of confocal microscopy

In a method of imaging an object, for dental purposes, comprises:

Method and system for imaging an object

A 3-D camera and a method for recording surface structures on an object of interest by triangulation, in particular for dental purposes. The camera provides for producing a group of light beams in order to illuminate the object of interest via a projection optical path, an image sensor for receiving light back-scattered by the object of interest via an observation optical path, and provides, in the projection optical path, for producing a pattern projected onto the object of interest. To avoid ambiguities in the event of large height differences, the camera provides for the projection optical path and/or the observation optical path for altering the triangulation angle, which is defined by the angle between the centroid beam of the projection optical path and the centroid beam of the observation optical path. The proposed process involves the taking of at least two 3-D measurements of the same object of interest with different triangulation angles.

3-D camera for recording surface structures, in particular for dental purposes

An apparatus for recording medical objects, in particular for recording models of prepared teeth, comprising a position-sensitive sensor ( ), which is movable in the projection direction, with a projection unit and a receiving unit ( - - ), and with a certain triangulation angle (&agr;) located between the projection path of the rays ( ) of the projection unit ( - ) and the observation path of the rays ( ) of the receiving unit ( - ), and with the projection path of the rays ( ) aligned parallel to the direction of movement of the sensor ( ), is realized for the accurate recording action of edges and steep surfaces of the type that occur in tooth cavities with a triangulation angle (&agr;) that is smaller than 10&deg;, preferably smaller than 5&deg;.

Method and apparatus for recording medical objects, in particular for recording models of prepared teeth

A dental x-ray diagnostics installation for producing panorama tomograms of the jaw of a patient has clocked CCD sensors which generate electrical signals proportional to the radiation intensity thereon, and which are operated at a speed to simulate a moving x-ray film. For the purpose of simultaneously acquiring exposures of a number of different jaw slices at different depths of field during one exposure, at least some of the CCD columns are driven with different clock frequencies by separate clock inputs.

Growing community of inventors

Gross-Gerau, Germany

Axel Schwotzer