Method and device for generating orthodontic teeth alignment shape

A device for generating an orthodontic teeth alignment shape for an orthodontic treatment of a patient, the device comprising:

• a processor;
• and
• a memory for storing instructions executable by the processor,
• wherein the processor is configured to:
• execute the instructions to acquire a teeth shape information of the patient;
• extract first specific points of respective teeth within a given range of at least one of upper and lower jaws of the patient, based on the teeth shape information, each of the first specific points being a coordinate in a three-dimensional shape and being Facial Axis (FA) points corresponding to each of a plurality of teeth;
• project the first specific points on a reference plane;
• generate a patient's arch form by connecting the first specific points;
• compare the patient's arch form produced by connecting the first specific points to one another with a plurality of standard arch forms stored in a database, each standard arch forms having a three-dimensional curve shape;
• select the standard arch form that is most similar to the patient's arch form from the plurality of standard arch forms, based on a result from the comparing;
• and
• generate the orthodontic teeth alignment shape based on the standard teeth arch form;
• and
• transmit the orthodontic teeth alignment shape to an orthodontic appliance generating device to apply the orthodontic teeth alignment shape to an orthodontic appliance,
• wherein the processor is configured to compare the three-dimensional patient's arch form with the plurality of standard arch forms by comparing the three-dimensional patient's arch form with the plurality of standard arch forms projected on a two-dimensional reference plane, and
• wherein the processor is configured to project the first specific points on the two-dimensional reference plane by:
• determining the first specific points of the respective teeth within the given range;
• calculating three-dimensional coordinates of the first specific points with respect to predetermined reference points;
• producing the two-dimensional reference plane by using three-dimensional coordinates, the two-dimensional reference plane having a minimal sum of vertical distances from the first specific points;
• projecting the first specific points on the two-dimensional reference plane;
• and
• calculating two-dimensional coordinates of the first specific points projected on the two-dimensional reference plane.