US 9,808,326 B2Granted

3D dentofacial system and method

AssigneePresident and Fellows of Harvard College

InventorMohamed I. Masoud

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Abstract

A reference standard or reference system for dental feature location and orientation can include evaluating the facial appearance of one or more subjects based on aesthetic criteria and selecting a subset of subjects. The reference standard further includes constructing 3D representations, (e.g., a 3D virtual model), of the facial and dental features of the subset of subjects, from photographs of the face and mouth of each subject and determining the location and/or orientation of one or more dental features for each subject. The location and/or orientation values for each subject can be used to produce an average value and a standard deviation that forms the basis for a reference standard as part of reference system for evaluating patients. The method and system further includes constructing 3D representations (e.g., a 3D virtual model) of the facial and dental features of a patient from photographs of the face and mouth of the patient and determining the location and/or orientation of one or more dental features of the patient in order to compare them to the reference standard and develop a treatment plan for the subject based on differences between the patient's measurements and reference standard. The reference standard can use the pupils (e.g., in the natural head position orientation) as a landmark for registration and scaling of the reference standard to the patient under evaluation.

Claims15

Dependent claims

A method for determining a reference standard diagnostic tool comprising:

selecting a set of subjects meeting a first set of aesthetic criteria;
determining a 3 dimensional (3D) representation of a head and mouth of each subject from two or more photographic images of the head and mouth of each subject, the 3D representation including an indication a central point of a left pupil and a right pupil of each subject;
wherein the 3D representation of the head and mouth is determined by indexing a first photographic image to a second photographic image by marking an area in the first photographic image and searching for an area in the second photographic image having a substantially same curvature as the marked area in the first photographic image;
identifying at least one dental feature and at least one facial feature in the 3D representation of the head and mouth of each subject;
identifying at least one landmark on the at least one dental feature and at least one landmark on the at least one facial feature in the 3D representation of the head and mouth of each subject;
defining in the 3D representation of the head and mouth of each subject a mid-axial plane extending horizontally through the central point of both pupils of each subject;
defining in the 3D representation of the head and mouth of each subject a mid-coronal plane extending vertically through the central point of both pupils of each subject;
defining in the 3D representation of the head and mouth of each subject a left sagittal plane extending vertically through the left pupil of each subject;
defining in the 3D representation of the head and mouth of each subject a right sagittal plane extending vertically through the right pupil of each subject;
determining a first dental landmark distance from at least one of the mid-axial plane, the mid-coronal plane, the left sagittal plane, and the right sagittal plane to the at least one landmark on the at least one dental feature;
and
determining a first facial landmark distance from at least one of the mid-axial plane, the mid-coronal plane, the left sagittal plane, and the right sagittal plane to the at least one landmark on the at least one facial feature.

9 more elements

A method for determining an orthodontic patient treatment plan from reference standard comprising:

determining a 3 dimensional (3D) representation of a head and mouth of the patient from two or more photographic images of the head and mouth of the patient, the 3D representation including an indication a central point of a left pupil and a right pupil of the patient;
wherein the 3D representation of the head and mouth is determined by indexing a first photographic image to a second photographic image by marking an area in the first photographic image and searching for an area in the second photographic image having a substantially same curvature as the marked area in the first photographic image;
identifying at least one dental feature and at least one facial feature in the 3D representation of the head and mouth of the patient;
identifying at least one landmark on the at least one dental feature and at least one landmark on the at least one facial feature in the 3D representation of the head and mouth of the patient;
defining in the 3D representation of the head and mouth of the patient a mid-axial plane extending horizontally through the central point of both pupils of the patient;
defining in the 3D representation of the head and mouth of the patient a mid-coronal plane extending vertically through the central point of both pupils of the patient;
defining in the 3D representation of the head and mouth of the patient a left sagittal plane extending vertically through the left pupil of the patient;
defining in the 3D representation of the head and mouth of the patient a right sagittal plane extending vertically through the right pupil of the patient;
determining a first dental landmark distance from at least one of the mid-axial plane, the mid-coronal plane, the left sagittal plane, and the right sagittal plane to the at least one landmark on the at least one dental feature of the patient;
comparing the first dental landmark distance with a corresponding reference standard distance to determine a deviation from the reference standard distance;
and
determining a patient treatment plan as a function of the determined deviation from the reference standard distance.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/661,820Filed 18 Mar 2015 · us provisional application
Priority: 18 Mar 2014
Published: US 2015/0265374 A124 Sep 2015
Granted: 7 Nov 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

A61C 7/002
Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by…:…
A61B 5/0088
Adapted for particular medical purposes: for oral or dental tissue
A61B 34/10
Computer-aided surgery; Manipulators or robots specially adapted for use in surgery: computer-aided planning, simulation or modelling of surgical…
G06V 20/647
Three-dimensional [3D] objects: by matching two-dimensional images to three-dimensional objects