AR Dental Model Export via Weighted Non-Rigid Deformation

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Solution Overview

Problem

Existing methods for exporting three-dimensional dental design models from augmented reality applications fail to accurately match the patient's dentition in both visible and less visible regions, such as the incisors and molars, leading to inaccuracies in dental design models.

Innovation Solution

The method employs weighted non-rigid deformations to adapt the positioned dental design model to a three-dimensional scan model, restricting movements perpendicular to the viewing axis more for visible regions like incisors and allowing greater movements for non-visible regions like molars, ensuring a better alignment and minimizing shape differences.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the user manually positions the dental design model on the display in an augmented reality application, then the visible region (incisors) can be aligned well, but the less visible molar region does not match the patient's dentition

Engineering Contradiction:

Improvealignment accuracy of visible regionVSAvoidalignment accuracy of molar region

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

The patent applies different quality requirements to different regions of the dental model. Visible regions (incisors) are prioritized for manual user alignment, while less visible regions (molars) are handled through automated non-rigid deformation techniques. This local differentiation resolves the contradiction by allowing each region to be optimized according to its specific requirements rather than applying a uniform alignment approach.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent replaces the purely manual mechanical positioning approach with an automated computational system. Non-rigid deformation algorithms automatically adjust the dental design model to match the scan model in the molar region, substituting manual mechanical alignment with automated image processing and mathematical transformation techniques.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If the dental design model is rigidly positioned to match visible regions, then user control is maintained, but the overall shape difference with the scan model increases

Engineering Contradiction:

Improveuser control over positioningVSAvoidshape difference from scan model

Core Design Contradiction:

Ease of operationVSShape

Solution Approach 1:

The patent transitions from rigid static positioning to dynamic non-rigid deformation. The dental design model is allowed to deform flexibly to match the scan model's shape while maintaining user-controlled positioning in visible regions. This dynamic approach enables the model to adapt its shape locally without losing overall user control.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent segments the dental model into different regions with different degrees of freedom. Visible regions maintain user-controlled rigid positioning, while other regions allow non-rigid deformation. This segmentation enables simultaneous user control and shape adaptation without conflict.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12178672B2Method for exporting a three-dimensional esthetic dental design model from an augmented reality application to a computer-aided design application

Publication Date: 2024.12.31 IVOCLAR VIVADENT AG

AI summary

A method for exporting a three-dimensional dental design model based on a three-dimensional dental library model (4) from an augmented reality application (6) which is adapted to visualize an image of the dental library model (4) rendered by a virtual camera with a preliminary pose and scale in a photo (2) of a face of a patient taken by a camera under a viewing axis to the face of the patient, the photo (2) including a mouth opening showing at least part of the present situation of the patient's dentition.