Dentsply Sirona Inc.

Sirona Dental Systems Gmbh

Anders Adamson

Frank Thiel

Sascha Schneider

Konrad Klein

Björn Popilka

Ulf Willers

Marcel Meyer

Peter Fritz

Tom Bobach

Ruwen Schnabel

Gerrit Kocherscheidt

Volker Wedler

Frederike Franke

Björn Voss

Steffen Hauth

Burkhard Lehner

Markus Erbacher

Joost Sattler

Hong Keun Kim

Ole Jakubik

Nico Grund

The invention relates to an optical measuring method for the three-dimensional detection of the surface of an object using an optical recording unit. The optical recording unit is moved relative to the object during a first measurement time interval, height maps are successively detected by the recording unit at a recording frequency, and at least some of the detected height maps are each added to an overall height map and displayed. The recording frequency is regulated by control signals during the measurement time interval. The control signals are generated spaced apart in time and for the purposes of producing each control signal, a statistic for the quality of the height map is determined for the respectively last detected height image and used for producing the control signal. The statistic is the overall intensity and/or the maximum intensity and/or the contrast and/or the number of extracted data points and/or a quality of extracted data points and/or the signal-to-noise ratio and/or the contrast of an additionally generated color image.

Optical measuring method and optical measuring apparatus

The invention relates to an optical measuring method for three-dimensionally capturing the surface of an object by means of an optical capturing unit, wherein the optical capturing unit is moved relative to the object during a first measurement time period, the object is illuminated by the capturing unit with an illumination beam having a light intensity, height images are captured by the capturing unit in succession at a capturing frequency, at least some of the captured height images during the measurement time period are added to form a total height image and the total height image is displayed, and the light intensity and/or the capturing frequency are controlled during the measurement time period by control signals, the control signals being produced at time intervals during the measurement time period and each control signal being produced on the basis of at least one sensor signal of a temperature sensor.

Optical measuring method and optical measuring device

The quality of digital impressions geometry and color but also fluorescence, transillumination, reflection and absorption properties can be inferior to single frame 2D/3D images e.g. due to averaging effects, rendering effects, difficult scanning situation etc. This can lead to difficulties in the dental workflow such as the creation of a preparation margin line or detection of diseases such as caries. By providing a correlated view of high-quality single frame images and corresponding 3D models, the dental workflow can be guided to be completed more efficiently using the single frame images.

Single frame control view

A method, system and computer readable storage media for defects in images during three-dimensional measurement of teeth. An operator may use a dental camera to scan teeth and a trained deep neural network may automatically detect portions of the input images having defects and generate output information regarding those defects for corrective measures to be taken.

Method, system and computer readable storage media for the detection of errors in three-dimensional measurements

A method, system and computer readable storage media for segmenting individual intra-oral measurements and registering said individual intraoral measurements to eliminate or reduce registration errors. An operator may use a dental camera to scan teeth and a trained deep neural network may automatically detect portions of the input images that can cause registration errors and reduce or eliminate the effect of these sources of registration errors.

Method, system and computer readable storage media for registering intraoral measurements

The invention relates to a method for producing a two-dimensional whole image of a recording region captured by means of a plurality of individual images, each having its own viewing direction and its own distance, wherein a spatial orientation of a main image plane of each individual image relative to a main image plane of the respective further individual image is determined on the basis of an overlap of the respectively captured subregions, and at least a plurality of the individual images are combined in accordance with the spatial orientations to form the whole image. The whole image area is the surface of a torus.

Method for producing a two-dimensional whole image

The invention relates to a measurement system for optically measuring an object, comprising a dental camera and an optical attachment. In this case the optical attachment comprises at least one lens, which is shaped and arranged in such a way that the optical attachment has a negative focal length so that a measurement field or a measurement volume of the dental camera is enlarged by the optical attachment.

Method and measurement system for optically measuring an object

The invention relates to a method for performing an optical three-dimensional recording by using hand-held dental camera. The camera automatically records a plurality of individual optical recordings in succession at a defined frequency during the measurement. The individual three-dimensional optical recordings are combined into an overall recording of a dental object to be measured and before the measurement is performed, a three-dimensional standard jaw model is displayed using a display device and a first control point on the standard jaw model is displayed using the display device. The hand-held dental camera is then positioned in relation to the object to be recorded in such a way that the camera points at the first control point of the standard jaw model and records a corresponding recording region of the dental object.

Method for performing an optical three-dimensional recording

A method of imaging a dental object using a dental camera comprising the steps of: recording a plurality of three-dimensional optical images of a dental object using a dental camera; determining whether an overlapping area, formed by at least a partial overlap of the plurality of three-dimensional optical images, satisfies one or more recording requirements; and generating an acoustic sound during the recording using a sound generator; wherein the sound serves as a feedback for the user and imparts to the user information (i) about the current status of a recording of the images and/or (ii) about recording requirements of the dental camera; wherein a speed of movement of the dental camera relative to the object is determined by (i) using a motion sensor on the dental camera or (ii) by analysis of the measured images; and wherein the acoustic sound is generated as a function of the determined speed of movement.

Method for measuring a dental object

The invention relates to a method for measuring a dental object () using a dental camera (). During measurement, several optical three-dimensional images () of the object () are produced. During measurement, an acoustic sound () is generated by means of a sound producer (), said sound () being used as feedback for the user and information relating to the current status of a recording of the images () and/or relating to image requirements of the dental camera () are transmitted to the user. Then, each individual image () it is automatically checked by a computer () as to whether an overlapping area () between the images () which are to be combined meets the defined recording requirements for a correct recording.

The invention relates to a method for recording individual three-dimensional optical images () to form a global image () of a tooth situation comprising an upper jaw () and a lower jaw (). A first 3D model () of a first subsection of the upper jaw and a second 3D model () of a second subsection of the lower jaw are produced from the individual images. Subsequently, a geometric positional relationship between the first 3D model () and the second 3D model () is determined, said positional relationship being determined by using a lateral image () and/or using a contact pattern (). Said lateral image () comprises an image area which comprises at least part of the first subsection of the upper jaw () and at least part of the second subsection of the lower jaw (). Said contact pattern comprises several contact areas () between the upper jaw and the lower jaw. Said contact pattern () is measured by means of an occlusion paper ().

Method for recording individual three-dimensional optical images to form a global image of a tooth situation

The invention relates to a method for recording individual three-dimensional optical images () to form a global image of a dental object () which is to be measured. After each individual image () is taken by means of a dental camera (), a computer () automatically checks whether an overlapping area () between the images which are to be combined meet the recording requirements determined for a correct recording. If the overlapping area () meets the recording requirements, the recording is carried out between the images () to be combined and a first image sequence () is set in motion. Said images of the first image sequence () are subsequently combined to form a first cluster (). If the overlapping area () of an image () does not meet the recording requirements, the first image sequence () is interrupted, an additional second image sequence () is automatically started with said image (). Subsequently, the images of the second image sequence () are combined to form a second cluster ().

Method for recording individual three-dimensional optical images of a dental object

The invention relates to a reference object () and a method for checking a measuring system (), wherein a plurality of three-dimensional recordings () of a reference object are recorded from different recording directions () by means of the measuring system (). The reference object () has a closed shape, wherein each of the three-dimensional recordings () is registered with at least the preceding recording (). In the case of a faulty calibration and/or in the case of a faulty registration, the individual recordings () are deformed compared to the actual shape of the reference object (), so that the deformation continues when assembling the individual three-dimensional recordings () to form an overall recording () and the generated overall recording () deviates in its dimensions from the dimensions of the reference object () as a result thereof. At least one object region () of the reference object () is measured twice, at the beginning of a circuit and at the end of the circuit, wherein a distance () is determined in the overall recording () between a first position of the object region () in a first recording at the beginning of the circuit and a second position of the object region () in a second recording at the end of the circuit.

Method and reference model for checking a measuring system

A method and apparatus for forming an overall image of an object from a plurality of images. Each image includes three-dimensional data and color data and is segmented based on the color data to identify a first region with hard tissue and a second region with soft tissue. For each image, first and second weighting factors may be assigned. Points in the second region with a larger distance to a corresponding proximate part of the first region may have a smaller second weighting factor than a point with a smaller distance to a corresponding proximate part of the first region. The second weighting factor may be variable, with its value dependent upon a value of a first area section corresponding to the first region.

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Darmstadt, Germany

Anders Adamson