Abstract: Method for segmenting a digital model (4) of teeth comprising a three-dimensional triangular mesh (41), wherein automatic means (6) implement the following steps, which are referred to as initial steps: classifying, within the mesh (41), at least one triangle into a concave category and/or at least one triangle into a convex category, and identifying, within the mesh (41), at least one tooth region comprising triangles such that each triangle of the region has at least one neighbouring triangle in the region, all the triangles of the region belonging to neither the convex nor the concave category.

Abstract: A device for tooth shade measurement comprising a housing, a handle and a measuring head, characterized in that said measuring head includes a hollow body extending along a longitudinal axis, said hollow body comprising a proximal end, a bent distal end relative to the longitudinal axis, said distal end being provided with a removable tip designed to come into contact with a tooth surface to be analyzed, at least one light source and image acquisition means, integral with the hollow body, said hollow body being adapted to transmit the light from said light source from the proximal end up to the distal end, and in that said device comprises an orientation assembly for mounting the proximal end of the hollow body in the housing so that the measuring head occupies different angular positions relative to the housing.

Abstract: Disclosed is an illumination device for an apparatus for establishing the color of a tooth, including in the mouth, the illumination device including a support with a lens system that includes at least one lens, an illumination unit, image capturing unit, and a front protection. The illumination unit is arranged at the periphery of the visual field of the lens system.

Abstract: Disclosed is an illumination device for an apparatus for establishing the color of a tooth, including in the mouth, the illumination device including a support with a lens system that includes at least one lens, an illumination unit, image capturing unit, and a front protection. The illumination unit is arranged at the periphery of the visual field of the lens system.

Abstract: A device for tooth shade measurement comprising a housing, a handle and a measuring head, characterized in that said measuring head includes a hollow body extending along a longitudinal axis, said hollow body comprising a proximal end, a bent distal end relative to the longitudinal axis, said distal end being provided with a removable tip designed to come into contact with a tooth surface to be analyzed, at least one light source and image acquisition means, integral with the hollow body, said hollow body being adapted to transmit the light from said light source from the proximal end up to the distal end, and in that said device comprises an orientation assembly for mounting the proximal end of the hollow body in the housing so that the measuring head occupies different angular positions relative to the housing.

Abstract: A method for manufacturing and controlling the conformity of a dental prosthesis from parameters obtained intra-orally with a shade selecting device is described herein. The method includes: selecting the shade of the client tooth to be replaced or restored by the practitioner using the practitioner's shade selecting DPraticien device, with local storage of such data, transmitting these data to a practitioner's computer station equipped with software for visualizing the measurement data and possibly with software for entering the client's contact information and specific data, both software programs being advantageously combined, transmitting these data to a dental technician's computer station, manufacturing by the dental technician of the prosthesis according to the data received from the practitioner, controlling the prosthesis data using a dental technician's shade selecting DProthésiste device, self-calibrated in the same way as the DPraticien device, and sending the prosthesis to the practitioner.

Abstract: Method and laser oscillator for the generation of a laser beam—According to the invention with a view to adjusting, inside said laser oscillator (1), the phase of each of the N elementary laser beams (FLE.1, FLE.2, FLE.N) generated on the basis of said laser oscillator (1) in such a way that said elementary laser beams are in phase, the deviation between the phase of an individual elementary laser beam (FLE.1) and the phases of the N?1 other elementary laser beams (FLE.2, FLE.N) is converted into a level of luminous intensity by means of at least one optical filtering element to which at least a part of each elementary laser beam is directed.

Abstract: The invention relates to a laser cavity with central extraction by polarisation for coherent coupling of intense intra-cavity beams. The laser cavity (1) according to the invention comprises an extraction unit (7) with central extraction, which divides the laser cavity (1) longitudinally into two functional portions (P1, P2), namely a first portion (P1) including the active components (3), which amplifies the laser beams (4), and a second portion (P2) which performs coherent coupling of the laser beams (4).

Abstract: Method and laser oscillator for the generation of a laser beam—According to the invention with a view to adjusting, inside said laser oscillator (1), the phase of each of the N elementary laser beams (FLE.1, FLE.2, FLE.N) generated on the basis of said laser oscillator (1) in such a way that said elementary laser beams are in phase, the deviation between the phase of an individual elementary laser beam (FLE.1) and the phases of the N?1 other elementary laser beams (FLE.2, FLE.N) is converted into a level of luminous intensity by means of at least one optical filtering element to which at least a part of each elementary laser beam is directed.

Abstract: The invention relates to a laser cavity with central extraction by polarisation for coherent coupling of intense intra-cavity beams. The laser cavity (1) according to the invention comprises an extraction unit (7) with central extraction, which divides the laser cavity (1) longitudinally into two functional portions (P1, P2), namely a first portion (P1) including the active components (3), which amplifies the laser beams (4), and a second portion (P2) which performs coherent coupling of the laser beams (4).