Method for exporting a three-dimensional esthetic dental design model from an augmented reality application to a computer-aided design application

A method for exporting a three-dimensional dental design model based on a three-dimensional dental library model (4) from an augmented reality application (6), the method comprising:

• retrieving a three-dimensional scan model (10) of the present situation of a patient's dentition,
• adapting the three-dimensional dental library model (4) to the scan model (10) with non-rigid deformations by minimizing a measure of shape difference between the dental library model (4) and the scan model (10) to obtain a modified dental library model (5),
• placing within the augmented reality application (6) an image of the modified dental library model (5), rendered by a virtual camera with a preliminary pose and scale in a photo (2) of the face of the patient taken by a camera under a viewing axis to the face of the patient, the photo (2) including a mouth opening showing at least part of the present situation of the patient's dentition, on the photo (2) and providing tools to modify and/or move the modified dental library model (5) on a display (7) to obtain a desired dental design model (8),
• aligning the scan model (10) and the present situation of the patient's dentition in the photo (2) to obtain a pose of the scan model (10),
• calculating, based on the preliminary pose and scale and the pose of the scan model (10), at least one transformation to bring the desired dental design model (8) and the scan model (10) into a common coordinate system, wherein the desired dental design model (8) is brought to a coordinate system of the scan model (10) to obtain a positioned dental design model (12)
• wherein the non-rigid deformations are weighted and are used to adapt the three-dimensional dental library model (4) to the scan model (10).

A method for exporting a three-dimensional dental design model based on a three-dimensional dental library model (4) from an augmented reality application (6), the augmented reality application (6) being adapted to visualize on a display (7) an image of the dental library model (4) rendered by a virtual camera with a preliminary pose and scale in a photo (2) of a face of a patient taken by a camera under a viewing axis to the face of the patient, the photo (2) including a mouth opening showing at least part of the present situation of the patient's dentition, the method comprising:

• placing within the augmented reality application (6) the rendered image of the dental library model (4) on the photo (2) and providing tools to modify and/or move the dental library model (4) on the display (7) to obtain a desired dental design model (8),
• providing a three-dimensional scan model (10) of the present situation of the patient's dentition,
• aligning the scan model (10) and the present situation of the patient's dentition in the photo (2) to obtain a pose of the scan model (10),
• calculating, based on the preliminary pose and scale and the pose of the scan model (10), at least one transformation to bring the desired dental design model (8) and the scan model (10) into a common coordinate system to obtain a positioned dental model (12),
• adapting the positioned dental design model (12) to the scan model (10) with non-rigid deformations by minimizing a measure of shape difference between the positioned dental design model (12) and the scan model (10) to obtain a modified dental design model (14) as the dental design model for export, and
• applying weighted non-rigid deformations,
• wherein by applying weighted non-rigid deformations, movements along the viewing axis are allowed for the positioned dental design model (12) by allowing to apply the same high weights to the movements along the viewing axis of the positioned dental design model (12).