Tooth Axis Estimation from 3D Crown Data
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Solution Overview
Problem
Current technologies face challenges in accurately estimating the tooth axis from three-dimensional crown data, particularly when parts of the crown shape are missing, and in creating tooth profile data without manual input or precise alignment with reference shapes.
Innovation Solution
A tooth axis estimation program and device that extracts key points from three-dimensional profile data, calculates the optimal alignment of these points with reference data to minimize error, and specifies the tooth axis direction automatically, using a combination of vertex extraction, normal vector calculation, and local coordinate system definition to align the crown data with reference shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual input or user assistance is required to recognize individual teeth, then ease of operation deteriorates, but measurement precision may be maintained
Solution Approach 1:
The system performs self-service by automatically extracting feature points from three-dimensional crown data and calculating tooth axis direction without requiring manual user input. The computer executes the entire process autonomously, from point extraction to axis specification, eliminating the need for user assistance while maintaining high precision through automated feature point selection and coordinate system calculations.
2Ease of manufacture
If crown data with missing parts is used, then ease of manufacture improves, but measurement precision deteriorates
Solution Approach 1:
The system extracts only the essential feature points from the three-dimensional crown data that are necessary for accurate tooth axis estimation, rather than requiring complete crown data. By selecting key feature points that define the tooth morphology, the system can accurately determine the tooth axis even when portions of the crown data are missing or incomplete.
3Productivity
If automated processing is implemented, then productivity improves, but device complexity increases
Solution Approach 1:
The automated processing system divides the tooth axis estimation process into distinct sequential steps: extracting feature points from crown data, calculating normal vectors at each point, defining local coordinate systems, and determining tooth axis direction. This segmentation allows the complex automated process to be managed through modular operations, improving productivity while keeping device complexity manageable through structured algorithm design.
Data Source
AI summary
The tooth axis estimation program includes, extracting a plurality of points from inputted three-dimensional profile data, the plurality of points indicating a surface of three-dimensional profile data; calculating an arrangement relationship between a point group and a first profile corresponding to a first three-dimensional profile data of a tooth in accordance with moving and/or rotating at least one of the first profile and the point group, the arrangement relationship corresponding to minimum difference between the point group and the first profile, the point group being included in a region of the extracted plurality of points; and specifying a direction of a tooth included in the region in accordance with the calculated arrangement relationship.