Tooth movement measurement by automatic impression matching
AssigneeAlign Technology, Inc.
InventorsFuming Wu, Vadim Matov, Jihua Cheng
Life of this patent
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Abstract
The present invention relates to systems and methods for detecting deviations from an orthodontic treatment plan. One method includes receiving a tracking model, performing a matching step between individual teeth in a plan model and the tracking model, comparing the tracking model with the plan model, and detecting one or more positional differences.
Claims18
A system for performing an alignment between digital models of a patient's teeth for improved detection of deviations from an orthodontic treatment plan, the system comprising:
- a data processing system comprising at least one processor;
- and
- a storage subsystem associated with the data processing system, wherein the storage subsystem comprises a memory subsystem, the memory subsystem comprising instructions that, when executed by the at least one processor, cause the system to:
- obtain, by the data processing system, a first digital model of the patient's teeth in a first arrangement and a second digital model of the patient's teeth in a second arrangement,
- detect, by the data processing system, in each of the first and second digital models, a partial region extending beyond and excluding one or more tooth crowns, the detecting being based on a polygon formed in part from identified cementoenamel junction (CEJ) points on a plurality of teeth and connecting the CEJ points of the plurality of teeth to enclose and define the partial region, and
- perform, by the data processing system, an alignment between the first and second digital models using the partial regions such that one or more stationary elements of each of the first and second digital models are aligned with one another.
A method for performing an alignment between digital models of a patient's teeth for improved detection of deviations from an orthodontic treatment plan, the method comprising:
- obtaining, by a storage subsystem associated with a data processing system, a first digital model of the patient's teeth in a first arrangement and a second digital model of the patient's teeth in a second arrangement, wherein the storage subsystem comprises a memory subsystem, the memory subsystem having one or more machine-readable instructions;
- detecting, by at least one processor in communication with the storage subsystem, in each of the first and second digital models, a partial region extending beyond and excluding one or more tooth crowns, the detecting being based on a polygon formed in part from identified cementoenamel junction (CEJ) points on a plurality of teeth and connecting the CEJ points of the plurality of teeth to enclose and define the partial region;
- and
- performing, by the at least one processor, an alignment between the first and second digital models using the partial regions such that one or more stationary elements of each of the first and second digital models are aligned with one another.
One or more non-transitory computer-readable storage media having stored thereon executable instructions that, when executed by at least one processor of a data processing system for performing an alignment between digital models of a patient's teeth for improved detection of deviations from an orthodontic treatment plan, cause the data processing system to:
- obtain, by a storage subsystem associated with a data processing system, a first digital model of the patient's teeth in a first arrangement and a second digital model of the patient's teeth in a second arrangement;
- detect, by at least one processor in communication with the storage subsystem, in each of the first and second digital models, a partial region extending beyond and excluding one or more tooth crowns, the detecting being based on a polygon formed in part from identified cementoenamel junction (CEJ) points on a plurality of teeth and connecting the CEJ points of the plurality of teeth to enclose and define the partial region;
- and
- perform, by the at least one processor, an alignment between the first and second digital models using the partial regions such that one or more stationary elements of each of the first and second digital models are aligned with one another.
Dependencies are inferred from the claim text.