3D Dental Arch Model Generation via Structured Light Projection
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Solution Overview
Problem
Conventional methods for generating three-dimensional digital models of dental arches are costly, uncomfortable, and time-consuming, often requiring intra-oral scans that involve a target object and are not easily accessible for self-administration.
Innovation Solution
A method involving the projection of a light beam onto the dental arch to create a light mark, with simultaneous displacement and image acquisition, followed by processing to generate a three-dimensional digital model using optimization and deep learning techniques, facilitated by a portable and inexpensive dental imaging device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an intra-oral optical scanner is used to generate 3D digital models of dental arches, then measurement precision is improved, but device complexity and cost increase, and ease of operation deteriorates
Solution Approach 1:
The patent uses a camera to capture images of light marks projected onto the dental arch, creating a visual copy of the arch's surface features. This optical copying approach replaces the complex intra-oral scanner while maintaining measurement capability through 2D image analysis that reconstructs 3D geometry.
Solution Approach 2:
The patent introduces light marks as an intermediary element between the measurement system and the dental arch. By projecting structured light patterns onto the arch and capturing their deformation, the system mediates the measurement process, enabling accurate 3D reconstruction without direct contact or complex scanning hardware in the mouth.
2Measurement precision
If an intra-oral optical scanner is used to generate 3D digital models, then measurement precision is improved, but loss of time increases due to the lengthy scanning process
Solution Approach 1:
The patent employs periodic flashing of light marks combined with rapid sequential image capture. By projecting light patterns and capturing images in quick succession during patient movement or device repositioning, the system accumulates multiple 2D frames that are later reconstructed into a complete 3D model, significantly reducing total measurement time.
Solution Approach 2:
The patent pre-programs the spatial coordinates and geometric relationships of multiple cameras and light projectors before the measurement session. This preliminary calibration and positioning setup enables rapid data acquisition during the actual scanning process, as the system already knows the precise spatial configuration needed for 3D reconstruction without requiring real-time adjustment.
3Measurement precision
If a target object (rigid staple) is used to generate 3D models as described in US 2003/0012423, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes the physical target object (rigid staple) from the measurement system. Instead of requiring a separate target to be attached to the dental arch, the system uses the arch itself as the target by projecting structured light patterns directly onto its surface and analyzing the deformation of these patterns, thereby eliminating the need for additional target hardware.
Solution Approach 2:
The patent makes the dental arch itself serve multiple functions: it is both the object being measured and the target for light projection. The arch's surface features naturally interact with the projected light patterns, eliminating the need for a separate universal target object and simplifying the overall measurement system while maintaining precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables rapid, comfortable, and cost-effective generation of accurate three-dimensional digital models of dental arches without the need for intra-oral scanners or expert intervention, allowing for self-administration and improved accessibility.
Implementation Method 1
projection of at least one light beam onto the arch, so as to draw at least one light mark on the arch
Data Source
AI summary
A method for generating a three-dimensional digital model of a dental arch of a patient. The method includes projection of at least one light beam onto the arch, so as to draw at least one light mark on the arch, and simultaneously, displacement of the arch across the beam and acquisition, during the displacement, of a series of updated images of the arch each showing an updated projection defined by the projected mark. The method includes identification of the updated projection on each updated image, then search for a three-dimensional digital model, called “updated model”, exhibiting a best fit with all the updated projections.