Laser Tooth Preparation Using 3D Peeling Surfaces for Molars
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Solution Overview
Problem
The layer-by-layer laser tooth preparation method is inefficient, particularly when used for large molar teeth, as it removes a significant amount of dental tissue.
Innovation Solution
A lift-off type laser tooth preparation method that involves acquiring STL models of the target tooth and tooth preparation, generating an inverted-cone shaped lifted-off surface, performing Boolean operations to determine the tissue to be removed, and generating a multi-layer laser cutting path for efficient tooth preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If layer-by-layer laser tooth preparation method is used, then the laser cutting path can be generated systematically, but the amount of dental tissue removed is excessive and efficiency is low
Solution Approach 1:
The patent applies preliminary action by performing Boolean operations on 3D models before the actual laser cutting process. The lifted-off surface model is generated and intersected with the target tooth model in advance to determine the precise tissue removal boundary, allowing the laser to only cut the necessary amount of tissue rather than removing all tissue layer by layer.
Solution Approach 2:
The patent transitions from 2D layer-by-layer cutting to 3D spatial modeling by generating a lifted-off surface model with conical geometry. This three-dimensional approach allows the system to calculate the precise intersection volume between the lifted-off surface and the target tooth, enabling selective removal of only the necessary tissue in three-dimensional space rather than sequential 2D layer removal.
2Ease of manufacture
If layer-by-layer laser cutting is employed, then the cutting head can follow a systematic path, but the processing time increases significantly for large teeth
Solution Approach 1:
The system performs all path planning and tissue boundary determination through Boolean operations on 3D models before the laser cutting begins. The multi-layer laser cutting path is generated in advance based on the intersection of the lifted-off surface model and target tooth model, eliminating the need for time-consuming sequential layer processing and allowing the laser to follow an optimized path from the start.
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
This method improves efficiency by reducing the amount of dental tissue to be removed and optimizing the laser cutting process, especially for larger teeth like molars.
Implementation Method 1
laser cutting path planning to produce a high-precision laser focus trajectory
Implementation Method 2
the cutting head cuts one layer of a two-dimensional (2D) graph by a dual galvanometer system before it moves the lens to cut the next layer
Data Source
AI summary
A peeling type laser tooth preparing method, apparatus and device, and a medium. Method comprises: acquiring a first STL model of a target tooth and a second STL model of a tooth preparation of the target tooth; generating a conical peeling curved-surface STL model, in a manner of taking a three-dimensional curve of a peripheral edge contour of a shoulder in the second STL model as a bottom edge; carrying out Boolean calculation on the peeling curved-surface STL model and the first STL model to obtain a third STL model; carrying out Boolean calculation on the second STL model and the third STL model to obtain a fourth STL model required to be removed; generating a multilayer laser cutting path according to the fourth STL model, controlling a laser tooth preparing device to perform the tooth preparing process of the target tooth according to the multilayer laser cutting path.