Abstract: 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.

Abstract: The invention relates to a method for recording individual three-dimensional optical images (2) to form a global image of a dental object (1) which is to be measured. After each individual image (2) is taken by means of a dental camera (3), a computer (8) automatically checks whether an overlapping area (5, 12) between the images which are to be combined meet the recording requirements determined for a correct recording. If the overlapping area (5) meets the recording requirements, the recording is carried out between the images (6, 7) to be combined and a first image sequence (9) is set in motion. Said images of the first image sequence (9) are subsequently combined to form a first cluster (23). If the overlapping area (12) of an image (13) does not meet the recording requirements, the first image sequence (9) is interrupted, an additional second image sequence (14) is automatically started with said image (13).

Abstract: The invention relates to a method for performing an optical three-dimensional recording by using a hand-held dental camera, wherein the camera automatically records a plurality of individual optical recordings in succession at a defined frequency during the measurement, wherein the individual three-dimensional optical recordings are combined by means of registration into an overall recording of a dental object to be measured. Before the measurement is performed, a three-dimensional standard jaw model is displayed by means of a display device, wherein a first control point on the standard jaw model is displayed by means of 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 (10) of the standard jaw model and records a corresponding recording region of the dental object.

Abstract: The invention relates to a reference object (3) and a method for checking a measuring system (1), wherein a plurality of three-dimensional recordings (4, 8) of a reference object are recorded from different recording directions (5) by means of the measuring system (1). The reference object (3) has a closed shape, wherein each of the three-dimensional recordings (4) is registered with at least the preceding recording (4). In the case of a faulty calibration and/or in the case of a faulty registration, the individual recordings (4, 8) are deformed compared to the actual shape of the reference object (3), so that the deformation continues when assembling the individual three-dimensional recordings (4) to form an overall recording (54) and the generated overall recording (54) deviates in its dimensions from the dimensions of the reference object (3) as a result thereof.

Abstract: 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.

Abstract: The invention relates to a method for recording individual three-dimensional optical images (1) to form a global image (50) of a tooth situation comprising an upper jaw (2) and a lower jaw (3). A first 3D model (6) of a first subsection of the upper jaw and a second 3D model (8) of a second subsection of the lower jaw are produced from the individual images. Subsequently, a geometric positional relationship between the first 3D model (6) and the second 3D model (8) is determined, said positional relationship being determined by using a lateral image (20, 21, 22) and/or using a contact pattern (31, 32). Said lateral image (20, 21, 22) comprises an image area which comprises at least part of the first subsection of the upper jaw (2) and at least part of the second subsection of the lower jaw (3). Said contact pattern comprises several contact areas (31, 32) between the upper jaw and the lower jaw. Said contact pattern (30, 31, 32) is measured by means of an occlusion paper (29).

Abstract: The invention relates to a method for measuring a dental object (1) using a dental camera (2). During measurement, several optical three-dimensional images (3, 50, 51) of the object (1) are produced. During measurement, an acoustic sound (10, 12) is generated by means of a sound producer (9, 11), said sound (10, 12) being used as feedback for the user and information relating to the current status of a recording of the images (3, 50, 51) and/or relating to image requirements of the dental camera (2) are transmitted to the user. Then, each individual image (3, 50, 51) it is automatically checked by a computer (6) as to whether an overlapping area (7, 8) between the images (3, 50, 51) which are to be combined meets the defined recording requirements for a correct recording.

Abstract: The invention relates to a method for recording individual three-dimensional optical images (2) to form a global image of a dental object (1) which is to be measured. After each individual image (2) is taken by means of a dental camera (3), a computer (8) automatically checks whether an overlapping area (5, 12) between the images which are to be combined meet the recording requirements determined for a correct recording. If the overlapping area (5) meets the recording requirements, the recording is carried out between the images (6, 7) to be combined and a first image sequence (9) is set in motion. Said images of the first image sequence (9) are subsequently combined to form a first cluster (23). If the overlapping area (12) of an image (13) does not meet the recording requirements, the first image sequence (9) is interrupted, an additional second image sequence (14) is automatically started with said image (13).

Abstract: The invention relates to a reference object (3) and a method for checking a measuring system (1), wherein a plurality of three-dimensional recordings (4, 8) of a reference object are recorded from different recording directions (5) by means of the measuring system (1). The reference object (3) has a closed shape, wherein each of the three-dimensional recordings (4) is registered with at least the preceding recording (4). In the case of a faulty calibration and/or in the case of a faulty registration, the individual recordings (4, 8) are deformed compared to the actual shape of the reference object (3), so that the deformation continues when assembling the individual three-dimensional recordings (4) to form an overall recording (54) and the generated overall recording (54) deviates in its dimensions from the dimensions of the reference object (3) as a result thereof.

Abstract: The invention relates to a method for recording several three-dimensional recordings of a dental object, wherein each of the three-dimensional images comprises 3D measured data and color data of a measured surface of the object, wherein the individual images are combined to form an overall image using a computer-assisted recording algorithm, wherein first regions with hard tissue and second regions with soft tissue are identified in each of the images using a segmentation method that depends on the color data. In applying the recording algorithm, the first regions and the second regions are weighted with different weighting factors.