Orthodontic Aligner Cutting via Thickness-Adaptive Parameter Control
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Solution Overview
Problem
Thermoforming methods for manufacturing orthodontic aligners often result in thickness variations, leading to uneven cutting and potential discomfort or deviations from the planned orthodontic treatment due to variations in heat, pressure, and preform thickness, causing issues with the cutting tool's efficiency and edge quality.
Innovation Solution
A method and system that generate a 3D representation of the aligner's thickness distribution by determining distances from inner vertices to a reference plane, allowing for the adjustment of cutting tool parameters to optimize cutting efficiency and edge quality, including the use of a heat map to visualize thickness variations and adjust cutting parameters accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermoforming process is used to manufacture aligners, then manufacturing efficiency is improved, but thickness uniformity deteriorates
Solution Approach 1:
The system performs preliminary actions by calculating the thickness distribution of the unfinished aligner before the cutting process. It determines the thickness at multiple points along the cut line and uses this information to pre-adjust cutting parameters, preventing thickness-related cutting issues before they occur.
Solution Approach 2:
The system changes cutting parameters dynamically based on the measured thickness distribution. It adjusts cutting speed, power, and other parameters along the cut line according to the local thickness at each point, transforming a uniform cutting process into a variable parameter process that adapts to thickness changes.
2Productivity
If cutting tool operates at high speed, then cutting efficiency is improved, but edge quality deteriorates
Solution Approach 1:
The system makes the cutting process dynamic by varying cutting parameters along the cut line based on local thickness. Instead of using constant high speed, it adjusts speed and power dynamically at each point to optimize both efficiency and quality, using higher speeds where thickness permits and reducing speed where thickness varies.
Solution Approach 2:
The system applies local quality by tailoring cutting parameters to the specific conditions at each point along the cut line. It determines the optimal cutting parameters for each local region based on the measured thickness, ensuring that each segment of the cut receives appropriate parameters for both efficiency and quality.
3Strength
If cutting parameters are optimized for thick portions, then cutting capability is improved, but power consumption increases
Solution Approach 1:
The system applies local quality to power consumption by adjusting cutting power and speed at each point along the cut line according to local thickness. It uses higher power and slower speeds only where necessary for thick portions, while using lower power and faster speeds for thinner portions, optimizing the overall power consumption profile.
Solution Approach 2:
The system changes power and speed parameters dynamically along the cut line based on thickness distribution. It modulates the cutting tool's power consumption to match the material thickness at each point, avoiding unnecessary high power consumption in thin regions while ensuring sufficient cutting capability in thick regions.
Data Source
AI summary
A method and a system for manufacturing an orthodontic appliance are provided. The method comprises: receiving a 3D mesh including a plurality of inner vertices representative of an inner surface of the appliance; generating a reference plane positioned relative to the arch form 3D mesh according to a predetermined position; determining, based on the 3D mesh, for each one of the plurality of inner vertices, a respective distance to the reference plane, the respective distance being indicative of a thickness of the appliance after forming; generating, based on the respective distance, a plurality of outer vertices representative of an outer surface of the appliance; generating, based on the plurality of inner vertices and the plurality of outer vertices, an appliance 3D representation of the appliance including data indicative of the thickness of the appliance; causing the manufacturing of the appliance based on the appliance 3D representation.