Three-Dimensional Orthodontic Retainer Manufacturing for Precise Fit
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Solution Overview
Problem
Conventional orthodontic retainers face issues with material deformation leading to mechanical stress, premature failure, and suboptimal fit due to manual bending, while three-dimensional designs require additional machining steps and material alteration, compromising durability and comfort.
Innovation Solution
A three-dimensional orthodontic retainer is produced directly from a biocompatible raw material without deformation, using computer-controlled manufacturing methods like multi-axis machining or 3D printing to maintain the material's original nano- or microstructure, ensuring precise fit and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual bending is used to adjust the wire to fit teeth, then the retainer can be customized to individual tooth shape, but the material undergoes plastic deformation creating residual stresses and micro-cracks that weaken the material
Solution Approach 1:
The patent replaces manual mechanical bending with computer-controlled wire bending machines that use precise mechanical systems to form the wire into three-dimensional shapes matching tooth structures. This substitution eliminates plastic deformation and residual stresses while maintaining high fit accuracy through digital modeling and automated control
Solution Approach 2:
The patent changes the wire material parameters by selecting materials with high elasticity and shape memory properties. These parameter changes allow the wire to be formed into precise three-dimensional shapes without permanent deformation, maintaining material strength while achieving accurate tooth fit through reversible elastic deformation
2Manufacturing precision
If the wire is bent into interdental spaces to achieve precise fit, then the retainer conforms better to tooth shape, but the wire may break due to excessive deformation
Solution Approach 1:
The patent changes the wire material parameters by using materials with optimized elasticity moduli and shape memory characteristics. These parameter changes enable the wire to navigate complex interdental spaces through reversible elastic deformation rather than permanent bending, achieving precise tooth conformity without breaking
Solution Approach 2:
The patent introduces dynamic properties to the wire system through shape memory materials that can reversibly change shape in response to thermal or mechanical stimuli. This dynamic behavior allows the wire to adapt to interdental spaces and recover from deformation, maintaining strength while achieving precise fit
3Reliability
If heat treatment is applied to remove material defects, then the material strength is restored, but extra time and energy are required and another machine is needed
Solution Approach 1:
The patent replaces heat treatment processes with computer-controlled mechanical wire bending systems that form the retainer without creating material defects. This substitution eliminates the need for additional heat treatment equipment and processes, reducing manufacturing complexity while maintaining material integrity through defect-free elastic deformation
4Ease of manufacture
If conventional manual bending is used, then the process is simple, but the precision of fit is limited even with experienced dental technicians
Solution Approach 1:
The patent replaces manual bending operations with computer-controlled wire bending machines that use digital models of tooth structures to automatically form precise three-dimensional wire shapes. This substitution maintains manufacturing simplicity through automated processes while dramatically improving fit accuracy through computer-aided design and manufacturing
Solution Approach 2:
The patent transitions from two-dimensional wire bending to three-dimensional wire forming using computer-controlled machines. This dimensional change enables complex spatial conformations that match the three-dimensional topology of tooth structures, achieving superior fit accuracy while maintaining ease of manufacture through automation
Data Source
AI summary
The invention relates to a three-dimensional orthodontic retainer (2) and to a method for producing such a retainer (2) in which the three-dimensional orthodontic retainer (2) is matched to the exact shape of the adjacent teeth (3) and is produced from a blank (1) in such a manner that the physical properties of the material of the remaining part of the blank (1) are unchanged in the retainer (2). The method for producing the three-dimensional orthodontic retainer (2) comprises the following method steps: creating three-dimensional model of the structure of the patient's teeth (3); designing a customised, precisely fitting model of the retainer (2); producing the retainer (2) on the basis of the designed 3D model by computer-controlled deposition or application of material.