Orthodontic Aligner Trimline Modeling for Precise CNC Edge Cutting
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Solution Overview
Problem
Current methods for manufacturing orthodontic aligners face challenges such as complex and time-consuming trimming processes, spatial limitations in CNC milling, and the need for manual modifications, which can compromise the design and prolong treatment time.
Innovation Solution
A computer-implemented method and system for defining a trimline in a 3-D digital model of teeth, generating machine code for aligner manufacturing, and using CNC machinery to produce edges that correlate with the trimline, reducing the need for manual modifications and improving manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual trimming with scissors is used, then flexibility for modification is improved, but time consumption and skill requirement increase
Solution Approach 1:
The trimline is pre-defined in the digital model before manufacturing, incorporating all necessary modifications in advance. This preliminary digital planning eliminates the need for time-consuming manual trimming while maintaining design flexibility, as all adjustments are made virtually before production begins.
Solution Approach 2:
Manual mechanical trimming with scissors is replaced by a digital design system that generates precise trimlines computationally. The mechanical cutting process is substituted with digital modeling and automated manufacturing guidance, reducing both time and skill requirements while maintaining adaptability.
2Extent of automation
If CNC milling is used for trimming, then automation is improved, but setup complexity and cost increase
Solution Approach 1:
Complex CNC milling setup is replaced by a streamlined digital workflow. The trimline defined in the digital model directly guides automated cutting with simplified toolpaths, eliminating complicated setup procedures while maintaining automation benefits. The system substitutes complex mechanical setup with intelligent digital planning.
Solution Approach 2:
The digital model serves as a precise copy of the intended final product, including the exact trimline geometry. This digital copy guides the manufacturing process directly, eliminating the need for complex physical setup and tooling while maintaining high automation levels.
3Productivity
If CNC milling is used for trimming, then productivity is improved, but manufacturing precision deteriorates due to spatial limitations
Solution Approach 1:
The trimline is carefully pre-planned in the digital model to account for toolpath constraints and spatial limitations. By anticipating manufacturing challenges during digital design, the system maintains high precision while achieving efficient automated production, avoiding the need for rework or manual intervention.
Solution Approach 2:
The system incorporates validation of the digital trimline against predetermined parameters before manufacturing. This feedback mechanism ensures that the designed trimline is manufacturable with required precision, allowing adjustments to be made in the digital model before production begins.
4Adaptability or versatility
If manual field modifications are made to aligners, then adaptability is improved, but structural integrity and treatment time are compromised
Solution Approach 1:
All necessary modifications are incorporated into the digital trimline design before manufacturing. This preliminary digital planning ensures that clinical adaptability needs are met while maintaining structural integrity, as modifications are optimized in the digital model rather than made manually after production.
Solution Approach 2:
Manual field modifications are replaced by digital design adjustments. The computational system optimizes the trimline to meet clinical needs while preserving structural integrity, eliminating the compromising effects of manual alterations made in the field.
Data Source
AI summary
Systems and methods of defining a trimline in relation to modeled teeth including modeled gingiva. The trimline is for use to manufacture an aligner. A margin point is placed proximate a gingival margin at each tooth on at least one jaw in the model. A trimline connects the plurality of margin points from which machine code is generated. The aligner manufactured includes an edge that correlates with the trimline according to the machine code. A margin point may be proximate a gingival zenith. At least one tooth cooperates with the modeled gingiva to define a line around the tooth. The trimline includes at least one tooth curve and at least one connector curve connected to the tooth curve at a transition point. At least one control point is on the trimline between two margin points. The trimline is defined by a spline that may be a Bèzier curve.