Digital Surface Model for Tooth Position Under Biting Forces
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Solution Overview
Problem
Existing methods for representing tooth position under biting forces fail to accurately account for individual tooth movements and deformations, leading to incorrect calculation of contact points and contact areas, resulting in reduced quality and fit of dental prostheses.
Innovation Solution
A method that records three-dimensional surface data of the maxilla and mandible under centric occlusion, defines registration regions not exposed to forces, and registers surface data to account for tooth movements, creating a modified digital surface model that accurately represents tooth positions and contact areas under biting forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If rigid conditions and rigidity are assumed in the assignment of mandible to maxilla via buccal recording, then the assignment process is simplified, but the movements of individual teeth upon contact under force and deformations cannot be correctly predicted, leading to incorrect contact points
Solution Approach 1:
The patent segments the teeth into individual movable elements within the digital surface model, allowing each tooth to be independently positioned based on force magnitude and direction calculations. This segmentation enables accurate representation of individual tooth movements while maintaining an overall simplified assignment process.
Solution Approach 2:
The patent changes the parameter representation from rigid fixed positions to dynamic positions influenced by force vectors. By calculating force magnitude and direction on each tooth and applying these as transformation parameters, the system accurately predicts tooth movements under biting forces while maintaining computational efficiency.
2Measurement precision
If a sensor film is clamped between the teeth to measure contact points and forces, then direct measurements of contact points are obtained, but the measurement error caused by the film thickness is greater than the tooth movement amplitude, and the teeth are not in natural occlusion
Solution Approach 1:
The patent creates a digital copy or model of the teeth and jaw structures, allowing virtual measurement and analysis of contact points without physical interference. This digital surface model enables precise measurement of tooth movements and contact points while maintaining natural occlusion conditions, avoiding the thickness error inherent in physical sensor films.
Solution Approach 2:
The patent replaces the mechanical sensor film system with a computational model that calculates force distribution and contact points based on digital surface data. This substitution eliminates the need for physical contact sensors that introduce measurement errors, achieving higher precision through mathematical modeling of the biting forces.
3Measurement precision
If a sensor film is used to measure forces, then only forces perpendicular to the film can be measured, but the remaining components of the actual force distribution remain unknown
Solution Approach 1:
The patent creates a universal computational model that can calculate all components of the force distribution (magnitude, direction, and orientation) on each tooth simultaneously. This multi-functional approach replaces the limited unidirectional measurement capability of sensor films, providing complete force vector information needed for accurate prosthesis design.
Solution Approach 2:
The patent transitions from one-dimensional force measurement (perpendicular only) to three-dimensional force vector analysis by calculating force magnitude, direction, and orientation in space. This dimensional expansion allows comprehensive measurement of all force components acting on teeth during biting, enabling accurate prediction of tooth movements in all directions.
Data Source
AI summary
A method for representing a tooth position under biting forces includes creating first surface data of a portion(s) of a maxilla tooth row and second surface data of an opposing portion(s) of a mandible tooth row, producing a digital surface model from the surface data, creating a data record which includes outer surface data of teeth lying in the portions of the maxilla tooth row and the mandible tooth row in a centric occlusion under biting forces, defining registration regions in the maxilla and mandible in the outer surface data which are not exposed to any force in the centric occlusion, registering the surface data on the outer surface data based on the registration regions, ascertaining movements of individual teeth outside of the registration regions from the outer surface data, transforming the movements ascertained into the surface data, and creating a modified digital surface model under consideration of the movements.