System and method for generating an electronic model for a dental impression having a common coordinate system

• US 7,702,492 B2
• Filed: 03/11/2004
• Issued: 04/20/2010
• Est. Priority Date: 03/11/2004
• Status: Active Grant

• Current Assignee: National Dentex Corporation (GDC Holdings, Inc.)
• Original Assignee: Geodigm Corporation (GDC Holdings, Inc.)
• Inventors: Marshall, Michael Craig
• Primary Examiner(s): Rodriguez; Paul L
• Assistant Examiner(s): Kim; Eunhee
• Application Number:
  US10/799,344
• Publication Number:
  US 20050203726A1
• Time in Patent Office: 2,231 Days
• Field of Search: 703/6, 703/11, 433/41, 433/67, 433/68
• US Class Current: 703/6
• CPC Class Codes: A61C 9/004 Means or methods for taking digitized impressions
• CPC Class Codes: G06T 17/00 Three dimensional [3D] modelling, e.g. data description of 3D objects

Abstract

A system for generating an electronic model having a common coordinate system includes a scanning device; a first plate module; and a second plate module. Each of the plate modules is configured to separately couple to the scanning device. The plate modules also can be moveably coupled together using an articulation device. Each of the plate modules includes alignment structures (e.g., spheres) to facilitate determining a position and orientation of the plate modules within a coordinate system of the scanning device.

Claims

1. A system for generating an electronic model of a dental study cast, the electronic model having a common coordinate system, the system comprising:

a base plate module configured to couple to a scanning device;

a first scanning module configured to couple to the base plate module, the first scanning module being configured to position a first study cast of a first dental arch within the scanning device to generate a first electronic model of the first dental arch, the first scanning module including a first plurality of alignment spheres configured to be scanned by the scanning device;

a second scanning module configured to position a second study cast of a second dental arch within the scanning device to generate a second electronic model of the second dental arch, the second scanning module including a second plurality of alignment spheres configured to be scanned by the scanning device, the second scanning module being configured to couple selectively to the base plate module and to the first scanning module;

an articulator configured to couple to the first and second scanning modules to form a combined scanning apparatus, the articulator being configured to position the first scanning module relative to the second scanning module to orient an occlusal surface of the first study cast towards an occlusal surface of the second study cast; and

a data processing system configured to generate the electronic models corresponding to each of the dental arches within a common coordinate system, the data processing system being configured to obtain position data of at least one of the alignment spheres from the combined scanning apparatus, the data processing system also being configured to transform position data of the first electronic model and the second electronic model based on the position data obtained from the alignment sphere, whereby a composite electronic model in a common coordinate system is generated, the composite electronic model representing the teeth of the upper jaw and the teeth of the lower jaw of the patient.

2. The system according to claim 1, wherein the scanning base plate module comprises an x-axis alignment channel and y-axis alignment channel;

and the physical model plate modules comprise the plurality of alignment spheres, the alignment spheres are coupled to the x-axis alignment channel and the y-axis alignment channel to position the second scanning plate module at a known location relative to the base plate module.

3. A method for generating an electronic model of teeth of a patient, the method comprising:

mounting a first physical model onto a first scanning plate module, the first physical model representing teeth of a lower jaw of a patient, the first scanning plate module positioning the first physical model within a coordinate system of a scanning device, the first scanning plate module including a plurality of alignment spheres and the first scanning plate module coupling the first physical model to a scanning base plate module of the scanning device;

scanning the first physical model to obtain position data of the teeth of the lower jaw of the patient and position data of the alignment spheres;

generating a first electronic model representing the teeth of the lower jaw of the patient, the first electronic model including a polygonal mesh representation of the scanned position data of the teeth of the lower jaw;

mounting a second physical model onto a second scanning plate module, the second physical model representing teeth of an upper jaw of the patient, the second scanning plate module positioning the second physical model within a coordinate system of a scanning device, the second scanning plate module including a plurality of alignment spheres and the second scanning plate module coupling the second physical model to a scanning base plate module of the scanning device;

scanning the second physical model to obtain position data of the teeth of the upper jaw of the patient and position data of the alignment spheres;

generating a second electronic model representing the teeth of the upper jaw of the patient, the second electronic model including a polygonal mesh representation of the scanned position data of the teeth of the upper jaw;

after generating the first and second electronic models, positioning each of the scanning plate modules to arrange the physical models relative to each other based on an interaction between the teeth of the lower jaw and the teeth of the upper jaw to form a composite scanning apparatus;

scanning one of the alignment spheres within the combined scanning apparatus to obtain position data of the alignment sphere within the combined scanning apparatus; and

transforming the scanned positional data of the first and second electronic models based at least in part on the position data of the alignment sphere within the combined scanning apparatus to generate a composite electronic model in a common coordinate system, the composite electronic model representing the teeth of the upper jaw and the teeth of the lower jaw of the patient.

4. The method according to claim 3 wherein the method further comprises generating a position transformation vector using positional data obtained by scanning the alignment sphere, the position transformation vector being used to transform the first and second electronic models into a common coordinate system.

5. The method according to claim 3, wherein positioning each of the scanning plate modules comprises positioning the scanning plate modules to arrange the physical models into a first bite position.

6. The method according to claim 5, wherein positioning each of the scanning plate modules comprises positioning the scanning plate modules into an occlusion centric relation position.