Abstract: The present disclosure relates to a computer-implemented method for improving the accuracy of a digital three-dimensional representation of a dental object during scanning, the method comprising the steps of: generating a digital three-dimensional (3D) representation of the dental object based on registration and stitching of a plurality of 3D scan patches; obtaining new 3D scan patches in real-time during scanning; registering said new 3D scan patches to the digital 3D representation during scanning, whereby said scan patches form part of the digital 3D representation; selecting a sub-set of 3D scan patches among the obtained or registered 3D scan patches, wherein said selection is performed during scanning; and re-registering one or more 3D scan patches forming part of the digital 3D representation, wherein said re-registering is based on applying one or more transformations to the selected sub-set of scan patches, whereby the accuracy of a digital 3D representation is improved.

Abstract: An additive manufacturing apparatus for building a product according to a planned geometry by successive solidification of a radiation-curable fluid in a solidification layer extending in a vertical direction from a surface of the fluid to a surface of the product. The apparatus includes: a vat holding the fluid; a support holding the product; a mechanism to control feeding of fluid to the solidification layer; a curing radiation source to generate a 2D exposure pattern of curing radiation in the solidification layer. The exposure pattern is defined by a curing radiation pattern geometry and/or curing radiation intensity. A radiation sensor receives radiation from the solidification layer. The radiation sensor generates a sensor signal having information indicative of a solidification process status. A control system is connected to the feed control mechanism and the curing radiation source.

Abstract: An additive manufacturing apparatus for building a product according to a planned geometry by successive solidification of a radiation-curable fluid in a solidification layer extending in a vertical direction from a surface of the fluid to a surface of the product. The apparatus includes: a vat holding the fluid; a support holding the product; a mechanism to control feeding of fluid to the solidification layer; a curing radiation source to generate a 2D exposure pattern of curing radiation in the solidification layer. The exposure pattern is defined by a curing radiation pattern geometry and/or curing radiation intensity. A radiation sensor receives radiation from the solidification layer. The radiation sensor generates a sensor signal having information indicative of a solidification process status. A control system is connected to the feed control mechanism and the curing radiation source.