Tooth Center of Resistance Calculation via Crown Geometry Extraction
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Solution Overview
Problem
Current methods for determining the center of resistance point for orthodontic treatment planning are inefficient as they require extensive image data, including CT scans and panoramic radiographs, which are not always necessary and can complicate the accuracy of tooth axis determination.
Innovation Solution
A method that uses image data from the crown portion of teeth, specifically obtaining a tooth mesh and identifying internal reference points to determine a mesiodistal line, intersection curve, and crown height, allowing for the calculation of the tooth axis and center of resistance without considering the root portion, utilizing a processor to execute these calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If extensive image data (CT scans and panoramic radiographs) is used to determine the center of resistance point, then the accuracy of tooth axis determination may be improved, but the device complexity and treatment planning complexity increase
Solution Approach 1:
The patent extracts and utilizes only the crown portion of the tooth from image data, separating it from the root portion. By focusing exclusively on the crown geometry and applying mathematical algorithms to determine the tooth axis and center of resistance point, the method eliminates the need for complex imaging of the entire tooth structure, thereby reducing device complexity while maintaining measurement precision
Solution Approach 2:
The patent creates a digital 3D model (copy) of the tooth crown from image data. This digital representation allows for repeated analysis and measurement without requiring additional physical imaging, enabling accurate determination of the tooth axis and center of resistance point while avoiding the need for multiple scans or radiographs
2Loss of information
If extensive image data including root portion is collected, then more complete tooth information is obtained, but the loss of time for data processing and treatment planning increases
Solution Approach 1:
The method extracts only the essential information needed for center of resistance point determination - the crown geometry - from the image data. By excluding the root portion from processing, the method reduces data processing time while retaining sufficient information for accurate treatment planning
Solution Approach 2:
The patent performs preliminary processing of the image data to isolate and segment the crown portion before main analysis. This preliminary action prepares the data in an optimized format that accelerates subsequent calculations of the tooth axis and center of resistance point, reducing overall processing time
3Loss of information
If additional image data (CT scans and panoramic radiographs) is required, then more comprehensive tooth information is available, but the ease of operation for orthodontic treatment planning decreases
Solution Approach 1:
The patent develops a universal algorithm that can determine the tooth axis and center of resistance point from various types of image data (intraoral scans, photographs, etc.) without requiring specific advanced imaging modalities. This multi-functional approach simplifies the workflow by allowing practitioners to use readily available imaging equipment while still obtaining comprehensive tooth information
Data Source
AI summary
A method and a system for determining a center of resistance point of a tooth for orthodontic treatment planning are provided. The method comprises: obtaining a tooth mesh from image data associated with a tooth crown of a patient; identifying a mesiodistal center of the tooth crown; determining a reference plane in the image data to extend through the mesiodistal center; determining an intersection curve based on an intersection of the reference plane and the tooth mesh, the intersection curve following a shape of the surface of the crown at the reference plane; determining a tooth axis of the tooth crown based on the intersection curve; determining a crown height of the tooth crown based on the tooth axis; and determining the center of resistance of the tooth based on the determined crown height and the determined tooth axis.