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CN-121986382-A - System and method for alignment and registration

CN121986382ACN 121986382 ACN121986382 ACN 121986382ACN-121986382-A

Abstract

Devices, systems, and methods for importing and/or transferring data including dental data from a three-dimensional (3D) dental model to a two-dimensional (2D) dental image may manipulate the 3D dental model based on the temporomandibular joint. A 2D projection image is generated from a 3D dental model of the patient. If the 2D projection image matches (is within a threshold) a 2D dental image (from a photo or the like) of the patient, the dental data may be transferred. If the 2D projection images do not match, the 3D dental model may be modified (based on the temporomandibular joint) and a new 2D projection image generated. In this way, the position of the 3D dental model may be iterated to generate a plurality of 2D projection images.

Inventors

  • LI GUOTU
  • GAO YUN
  • C. E. Kramer

Assignees

  • 阿莱恩技术有限公司

Dates

Publication Date
20260505
Application Date
20240926
Priority Date
20230926

Claims (20)

  1. 1. A method, comprising: Generating a 3D alignment model based on a three-dimensional 3D dental scan of a patient, wherein the 3D alignment model comprises segmentation data of a maxillary portion and a mandibular portion of the patient; Generating a two-dimensional 2D alignment projection based on the 3D alignment model; determining a 2D difference between a 2D dental image of a patient and the 2D alignment projection, and Dental information is imported from a 3D dental scan of the patient to a 2D dental image of the patient when the variance is less than a threshold.
  2. 2. The method of claim 1, wherein generating the 3D alignment model includes determining a position of the mandibular portion relative to the maxillary portion.
  3. 3. The method of claim 2, wherein the position of the mandibular portion is constrained by the position of a joint connecting the mandibular portion to the maxillary portion.
  4. 4. The method of claim 2, wherein the position of the mandibular portion is determined at least in part by a temporomandibular joint disposed relative to the maxillary portion.
  5. 5. The method of claim 1, wherein generating the 3D alignment model includes moving the mandibular portion relative to the maxillary portion.
  6. 6. The method of claim 5, wherein moving the mandibular portion is based on a position of a joint connecting the mandibular portion to the maxillary portion.
  7. 7. The method of claim 1, wherein generating the 2D alignment projection comprises determining a position of a projection plane in a common virtual 3D space and a position of the 3D alignment model.
  8. 8. The method of claim 7, further comprising projecting a dental element from the 3D alignment model to the projection plane, wherein the 2D alignment projection is based on the projected dental element.
  9. 9. The method of claim 7, wherein the position of the 3D alignment model and the position of the projection plane are based at least in part on a perspective associated with a virtual camera disposed in the common virtual 3D space.
  10. 10. The method of claim 7, wherein a portion of the projection plane is cropped prior to determining a 2D difference between the 2D dental image of the patient and the 2D aligned projection.
  11. 11. The method of claim 7, wherein determining the position of the 3D alignment model includes positioning a maxillary portion of the patient in 3D space using six degrees of freedom and positioning a mandibular portion of the patient in the 3D space using one degree of freedom.
  12. 12. The method of claim 7, wherein generating the 2D alignment projection comprises iteratively determining a position of the projection plane based on the difference between the 2D dental image of the patient and the 2D alignment projection.
  13. 13. The method of claim 1, wherein the 2D dental image is based on a photograph of a patient's dentition.
  14. 14. The method of claim 1, wherein the 2D dental image includes 2D information of a maxillary portion and a mandibular portion.
  15. 15. The method of claim 1, wherein determining the 2D difference between the 2D dental image of the patient and the 2D alignment projection comprises determining a difference between corresponding features of the 2D dental image of the patient and the 2D alignment projection.
  16. 16. The method of claim 1, wherein determining the 2D difference between the 2D dental image of the patient and the 2D alignment projection comprises determining a difference between contours of corresponding dental structures of the 2D dental image of the patient and the 2D alignment projection.
  17. 17. The method of claim 1, wherein determining the difference between the 2D dental image of the patient and the 2D alignment projection comprises determining a difference between tooth boundaries determined from the 2D dental image of the patient and the 2D alignment projection.
  18. 18. The method of claim 1, wherein the segmentation data is generated using one or more machine learning engines and one or more 3D models.
  19. 19. The method of claim 1, wherein the dental information comprises tooth number information.
  20. 20. The method of claim 1, wherein generating the 3D alignment model further comprises iteratively determining a position of the mandibular portion relative to the maxillary portion based on the difference between the 2D dental image of the patient and the 2D alignment projection.

Description

System and method for alignment and registration Priority statement The present patent application claims priority from U.S. provisional patent application No. 63/585,581, entitled "SYSTEM AND METHOD FOR ALIGNMENT AND REGISTRATION," filed on 9, 26, 2023, the entire contents of which are incorporated herein by reference. Incorporated by reference All publications and patent applications mentioned in this specification are herein incorporated by reference in their entirety to the same extent as if each individual publication or patent application was specifically and individually indicated to be incorporated by reference. Technical Field The systems and methods described herein relate generally to dental models, and more particularly to alignment and registration between different dental models associated with a patient. Background Orthodontic procedures typically involve repositioning a patient's teeth to a desired arrangement in order to correct malocclusions and/or improve aesthetics. To achieve these objectives, orthodontic appliances (such as braces, shell appliances, etc.) can be applied to the patient's teeth by an orthodontist and/or by the patient himself. The appliance can be configured to apply a force on one or more teeth to achieve a desired tooth movement according to a treatment plan. In general, treatment planning may be used with any medical procedure to help guide a desired treatment outcome. In some examples, orthodontic treatment planning may be used in orthodontic dental treatments in which a series of patient removable appliances (e.g., orthodontic appliances, palatal dilators, etc.) are provided to correct a variety of different orthodontic or dental conditions. Thus, the treatment plan may be used to determine a plurality of intermediate stages (steps) and corresponding individual sequentially worn dental appliances (appliances). In some cases, a joint simulation of the patient's upper and lower jaws may provide a more comprehensive view of the patient's entire dentition, which may aid in determining a treatment plan. Disclosure of Invention Embodiments address the need to provide a system for automatically, efficiently and accurately importing or capturing dental information (tooth numbers and/or other dental features) from a three-dimensional (3D) scan, dataset or model of a patient's dentition to a two-dimensional (2D) dental image. The present application solves these and other technical problems by providing a solution and/or an automated agent for comparing a 3D scan, 3D dataset or other 3D model with a 2D image. In some implementations, the 3D model can be projected onto a plane to generate a 2D projection that can be compared to the 2D image. If the 2D projection matches (is within the threshold) the 2D image, dental information from the 3D model may be imported (transferred) to the 2D image. Devices, systems, and methods for importing or transferring information from a 3D model to a 2D image are described herein. The 3D model may include the patient's mandible positioned relative to the patient's maxilla. The positioning may be based on the position of the temporomandibular joint hinging the mandible to the maxilla. In general, the 3D model may be positioned in a virtual 3D space, and the virtual camera may be positioned relative to the 3D model. A 2D projection of the 3D model is determined relative to the virtual camera. The 2D projection is compared to a 2D dental image of the patient. If the 2D projection matches (is within the threshold) the 2D dental image, data from the 3D model may be imported into the 2D dental image. Any of the methods described herein may include generating a three-dimensional (3D) alignment model based on a 3D dental scan of a patient, wherein the 3D alignment model includes segmented data of a maxillary portion and a mandibular portion of the patient, generating a two-dimensional (2D) alignment projection based on the 3D alignment model, determining a 2D difference between a 2D dental image of the patient and the 2D alignment projection, and importing dental information from the 3D dental scan of the patient to the 2D dental image of the patient when the difference is less than a threshold. In any method, generating the 3D alignment model may include determining a position of the mandibular portion relative to the maxillary portion. In some examples, the position of the mandibular portion may be constrained by the position of the joint connecting the mandibular portion to the maxillary portion. Further, in some examples, the position of the mandibular portion may be determined at least in part by a temporomandibular joint disposed relative to the maxillary portion. In any of the methods described herein, generating the 3D alignment model may include moving the mandibular portion relative to the maxillary portion. In some examples, moving the mandibular portion is based on the position of a joint connecting the mandibular portion to the maxillary p