Tooth Edge Restoration from Scan Profiles for Complex Margins
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Solution Overview
Problem
Existing methods for estimating and restoring tooth edges, such as those described in JP 2019-080839 A, are inadequate for accurately restoring edges with complex shapes like cavity margins or maintenance grooves, leading to suboptimal scan data quality and increased processing time.
Innovation Solution
A method involving the deletion of rounded edges in scan data, extraction of boundary lines, superposition of radially disposed plates, creation and extension of profile curves, and calculation of intersection lines to restore edges to a sharper, more accurate form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the edge of the tooth is deleted and temporary finish lines are extended in the deleted part, then the edge can be restored, but the restoration accuracy for complex shapes (cavity margins, maintenance grooves) is insufficient
Solution Approach 1:
The patent divides the restoration process into multiple stages: deleting the rounded edge, extracting boundary lines, creating profile curves at multiple heights, extending these curves, calculating intersection lines, and generating the final restored edge. This segmentation allows each stage to optimize for specific aspects of restoration accuracy, particularly for complex shapes like cavity margins and maintenance grooves.
Solution Approach 2:
The patent introduces a vertical dimension by creating profile curves at multiple heights (first height and second height from the tooth root) and calculating intersection lines between these curves. This multi-dimensional approach enables accurate restoration of complex edge geometries that cannot be achieved by extending temporary finish lines in a single plane.
2Productivity
If existing restoration methods are used, then processing can be completed, but processing time exceeds 10 minutes
Solution Approach 1:
The patent performs preliminary actions by extracting boundary lines and creating profile curves at multiple heights before extending and calculating intersections. These preliminary steps prepare the data structure in advance, enabling the final edge restoration to be computed more efficiently and reducing overall processing time to under 10 minutes.
3Manufacturing precision
If temporary finish lines are extended in the deleted part, then edge restoration is achieved, but the restored edge does not accurately represent complex shapes like cavity margins or maintenance grooves
Solution Approach 1:
The patent applies local quality by creating profile curves at multiple specific heights (first height and second height from the tooth root) rather than using a single extended finish line. This allows different portions of the edge, particularly complex shapes like cavity margins and maintenance grooves, to be restored with appropriate local detail and geometry.
Solution Approach 2:
The patent restores complex shape details by introducing a vertical dimension through multiple height levels. Profile curves are created at different heights and their intersections are calculated to generate the final restored edge, which accurately represents three-dimensional complex shapes that would be lost in a single-plane extension approach.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A method includes: acquiring scan data on a tooth; drawing an edge line closed; deleting scan data on the edge of the tooth; disposing data in which multiple plates are disposed at intervals along the edge line while superimposing the data on the scan data; creating a first profile curve and a second profile curve indicating an outline of the scan data across a part deleted in each of sections of the scan data, the sections being taken along the corresponding multiple plates in the data; extending the first profile curve and the second profile curve in a direction of compensating for the scan data on the part deleted in each of the sections of the scan data; and restoring the edge of the tooth based on the first profile curve and the second profile curve that are extended in each of the sections of the scan data.