Systems and methods for identifying a subject's teeth in image data

A method for developing an orthodontic treatment plan for a subject using a machine-learning algorithm (MLA),

• the MLA having been trained to identify root portions of a plurality of teeth of the subject based on a training data set, which has been generated by:
• acquiring training slices of a training 3D scan representative of cross-sections of a training arch form of a training subject that are extending in parallel to a first anatomical plane associated with the training subject,
• the training arch form having a plurality of training teeth, a given training tooth of the plurality of training teeth having a training crown portion and a training root portion;
• and
• analyzing boundary geometries of the training root portion of the given training tooth in (i) the first anatomical plane and (ii) at least one of a second anatomical plane and a third anatomical plane associated with the training subject to identify and remove image artefacts;
• the method comprising:
• acquiring a 3D scan representative of an arch form of the subject, the arch form having the plurality of teeth, a given tooth of the plurality of teeth having a crown portion and a root portion;
• defining, in the 3D scan, a plurality of slices representative of cross-sections of the arch form of the subject that are extending in parallel to the first anatomical plane associated with the subject;
• feeding a given slice of the plurality of slices to the MLA, thereby causing the MLA to generate a boundary geometry of the root portion of the given tooth;
• segmenting, in the 3D scan, the root portion of the given tooth along the generated boundary geometry;
• and
• generating the orthodontic treatment plan for the subject using data of the segmented root portion of the given tooth,
• the generating the orthodontic treatment plan comprising determining, based on the segmented root portion of the given tooth, at least one configuration of an orthodontic appliance to be applied to the plurality of teeth of the subject.

A method for developing an orthodontic treatment for a subject, the method comprising:

• acquiring a 3D scan of an arch form of the subject,
• the arch form having a plurality of teeth, a given tooth of the plurality of teeth having a crown portion and a root portion;
• defining, in the 3D scan, a plurality of slices representative of cross-sections of the arch form that are extending in parallel to a first anatomical plane associated with the subject;
• identifying, during a first surface boundary identification phase, a first boundary geometry of the root portion of the given tooth by determining, using the plurality of slices of the 3D scan, a contour of each cross-section of the root portion in the first anatomical plane associated with the subject;
• identifying, during a second surface boundary identification phase, following the first surface boundary identification phase, a second boundary geometry of the root portion of the given tooth by determining a contour of the root portion in a projection of the root portion to at least one of a second and a third anatomical planes associated with the subject;
• analyzing a combination of the first and second boundary geometries of the root portion to identify artefacts generated during at least one of the first and second surface boundary identification phases;
• removing the artefacts from the combination of the first and second boundary geometries of the root portion to generate a final boundary geometry of the root portion of the given tooth;
• segmenting, in the 3D scan, the root portion of the given tooth along the generated final boundary geometry;
• and
• generating the orthodontic treatment for the subject using data of the segmented root portion of the given tooth,
• the generating the orthodontic treatment comprises determining, based on the segmented root portion of the given tooth, at least one configuration of an orthodontic appliance to be applied to the plurality of teeth of the subject.