Dental Model Modification via 2D Line Projection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for modifying digital three-dimensional models of dentition are inefficient, particularly in quickly and intuitively adjusting the positioning and shape of visible teeth arch contour curves, which is crucial for dental restoration design.
Innovation Solution
A method that allows users to draw or sketch new lines on a displayed image of the dentition to modify the incisal curve or gingiva border curve, with the drawn line serving as input to deform the three-dimensional model, where the deformation is projected onto a surface to adjust the teeth arch contour curves, allowing for real-time visualization of modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If point-by-point input method is used to modify teeth arch contour curves, then modification precision can be achieved, but the operation time and complexity increase significantly
Solution Approach 1:
The patent replaces the mechanical point-by-point input method with a graphical line-drawing interface. Users draw continuous lines on a 2D image to define the desired teeth arch contour, which is then automatically converted into 3D model modification instructions. This substitution of manual point-input mechanics with graphical drawing mechanics dramatically reduces operation time while maintaining precision through the system's automated processing of the drawn lines.
Solution Approach 2:
The patent introduces an intermediary processing layer that converts the user's drawn lines on a 2D image into automated 3D model modification commands. This intermediary system includes algorithms that interpret the drawn lines, calculate the necessary geometric transformations, and apply them to the 3D teeth model, thereby eliminating the need for manual point-by-point input while preserving modification precision.
2Manufacturing precision
If traditional CAD/CAM tools are used for modifying digital models, then professional precision is achieved, but the ease of operation and intuitiveness deteriorate
Solution Approach 1:
The patent creates a 2D copy or projection of the 3D teeth model that users can interact with using simple drawing gestures. By working on this 2D representation rather than directly manipulating complex 3D geometry, users benefit from the intuitiveness of 2D graphical interfaces while the system maintains professional precision through accurate back-projection of the drawn modifications to the 3D model.
Solution Approach 2:
The patent transforms the interaction dimension from direct 3D manipulation to 2D image drawing. Users draw lines on a 2D displayed image of the teeth model, and the system automatically translates these 2D drawings into precise 3D model modifications. This dimensionality change makes the operation more intuitive and accessible while preserving professional-grade precision through automated geometric processing.
3Measurement precision
If detailed point-by-point markings are required for curve modification, then accuracy of contour definition is improved, but the device complexity and input complexity increase
Solution Approach 1:
The patent replaces the mechanical process of placing multiple discrete points to define a curve with a single continuous drawing gesture. Users draw a continuous line on the displayed image to define the entire contour modification, and the system's automated processing ensures accurate contour definition without requiring the user to manage complex point-by-point input procedures.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to a computer implemented method for modifying a digital three-dimensional model (3) of a dentition comprising: displaying an image of the dentition by applying a virtual camera to the three-dimensional model to render the image for a display (1); acquiring a line drawn by a user on the image on the display (1); projecting the acquired line, using the virtual camera (4), to a three-dimensional projection surface (7) approximating the shape of the dental arches and extending the upper and lower dental arches to cover any opening therebetween; obtaining visible teeth arch contour curves, namely incisal curve and gingiva border curve, of the upper and lower teeth arches, and projecting the teeth arch contour curves to the projection surface; selecting one of the teeth arch contour curves as teeth arch contour curve to be modified and selecting the other teeth arch contour curve of the same teeth arch or a curve derived therefrom as a baseline curve; deforming all teeth belonging to the selected teeth arch contour curve along the projected line in the three-dimensional model of the dentition in a length direction such that at least parts of the selected teeth arch contour curve, after deformation and projection to the projection surface, coincide with the projected line and any remaining parts of the selected teeth arch curve are located between the projected line and the baseline curve, whereas the baseline curve remains unaffected by the deformation.