Custom Ceramic Orthodontic Brackets via 3D Printing Precision
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Solution Overview
Problem
Current manufacturing techniques for orthodontic brackets, particularly ceramic labial and lingual brackets, lack precision and customization, leading to inaccuracies and increased treatment time due to off-the-shelf products and indirect bonding methods, which are aesthetically unappealing and inefficient.
Innovation Solution
Utilizing ceramic slurry-based additive manufacturing (AM) technologies like digital light processing (DLP) and laser photopolymerization to directly create customized labial and lingual orthodontic brackets, incorporating tooth-matching retentive features and precise slot positions, with manufacturing accuracy of less than 0.02 mm and layer thickness of 5 to 100 micrometers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional injection molding is used to manufacture ceramic brackets, then production efficiency is maintained, but manufacturing precision and customization capability deteriorate
Solution Approach 1:
The patent replaces traditional mechanical injection molding with a digital additive manufacturing process. A 3D scanner captures tooth morphology, CAD software designs custom brackets, and a stereolithography apparatus manufactures them layer-by-layer using photopolymerization. This digital workflow achieves sub-0.02mm precision and full customization while managing complexity through software automation.
Solution Approach 2:
The invention changes the fundamental manufacturing parameters from bulk injection molding to layer-by-layer photopolymerization. By controlling light exposure parameters (wavelength, intensity, duration) on each layer, the process achieves precise dimensional control (5-100 micrometer layer thickness) and complex geometries that are impossible with traditional molding.
2Productivity
If off-the-shelf brackets are used, then device complexity is reduced, but treatment time and customization deteriorate
Solution Approach 1:
The system performs preliminary scanning and design before bracket fabrication. A 3D scanner captures the patient's dentition, software automatically designs custom brackets with precise positioning, and they are manufactured on-demand. This preliminary digital preparation eliminates trial-and-error fitting and reduces clinical appointment time despite the added fabrication step.
Solution Approach 2:
The invention creates exact digital copies of the patient's tooth surfaces through 3D scanning, then uses these digital models to design and manufacture custom brackets that perfectly match the individual dentition. This copying approach enables full customization without requiring complex physical trial fittings.
3Manufacturing precision
If ceramic material is used for brackets, then aesthetics and biocompatibility are improved, but manufacturing precision and mechanical strength deteriorate
Solution Approach 1:
The patent uses ceramic particles suspended in a photopolymerizable resin matrix for additive manufacturing. The resin binds ceramic particles during layer-by-layer construction, then undergoes debinding and sintering to create fully dense ceramic brackets. This composite approach enables precise geometric control during manufacturing while achieving the mechanical strength and aesthetic properties of pure ceramic in the final sintered product.
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 accurate, efficient, and aesthetically pleasing custom ceramic brackets that reduce treatment time and errors by ensuring precise bracket placement and improved mechanical bond strength, allowing for in-office fabrication.
Implementation Method 1
a light-polymerizable material is polymerized by illumination
Data Source
AI summary
In an embodiment, a method of manufacturing customized ceramic labial/lingual orthodontic brackets by additive manufacturing may comprise measuring dentition data of a profile of teeth of a patient, based on the dentition data, creating a three dimensional computer-assisted design (3D CAD) model of the patient's teeth, and saving the 3D CAD model, designing a virtual 3D CAD bracket structure model for a single labial or lingual bracket structure based upon said 3D CAD model, importing data related to the 3D CAD bracket structure model into an additive manufacturing machine, and directly producing the bracket with the additive manufacturing machine by layer manufacturing from an inorganic material including at least one of a ceramic, a polymer-derived ceramic, and a polymer-derived metal.