Patent ID: 7596287

Claim:
Method for the three-dimensional mapping and digitization of a plaster or positive model ( 1 ), for producing a dental prosthesis, with the following steps: clamping the plaster or positive model ( 1 ) in a mounting frame ( 2 ) which is rotatable about an axis of rotation in a defined orientation; irradiating of the plaster or positive model ( 1 ) by means of a radiation source and receiving the radiation reflected by the plaster or positive model ( 1 ); evaluating the reflected radiation by a scanning unit ( 7 ) and generating a distance information; positioning the mounting frame in a plane running parallel to the x- and y- axes of a Cartesian coordinate system; definedly moving the plaster or positive model ( 1 ) relative to the radiation source along a first axis (y) which extends perpendicular or almost perpendicular to the direction of radiation; definedly moving the mounting frame ( 2 ) with the plaster or positive model relative to the radiation source along a second axis (x-axis) extending both perpendicularly or almost perpendicularly to the first axis (y-axis) and perpendicularly or almost perpendicularly to the direction of radiation; linking the second travel path with the distance information and the second travel path; linking a signal for detection of the rotation with the path and distance information for forming a three-dimensional volume model of the plaster or positive model ( 1 ), whereby the distance between the mounting ( 2 ) and scanning unit ( 7 ) in direction of the optical axis (z axis) of the scanning unit ( 7 ) remains unchanged or essentially unchanged during the digitization of the plaster or positive model ( 1 ) along a scanning path, where the length of the path is greater than or equal 1 mm.