Three-Dimensional Orthodontic Retainer Production Without Material Deformation
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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, resulting in discomfort and reduced durability, while three-dimensional designs are challenging to produce without additional machines and material weakening.
Innovation Solution
A method involving non-contact optical imaging to create a 3D model, followed by computer-controlled production from a raw piece without altering its nano- or microstructure, using multi-axis machining or 3D printing to form a custom-fit, three-dimensional orthodontic retainer with precise geometry and minimal material deformation.
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 a laser bending machine that uses controlled thermal energy to deform the wire. The laser heats specific sections of the wire to its plastic deformation temperature, allowing precise bending without mechanical force that would create micro-cracks. This substitution of mechanical bending with thermal processing resolves the contradiction by maintaining fit accuracy while preserving material integrity.
Solution Approach 2:
The patent changes the physical state parameter of the wire by heating it to its plastic deformation temperature during bending. This temporary parameter change allows the wire to be shaped precisely without creating residual stresses, as the material returns to its original state after cooling. The controlled temperature parameter change enables formability without compromising material strength.
2Reliability
If heat treatment is applied to remove deformation defects, then material strength is restored, but extra time and energy are required and another machine is needed
Solution Approach 1:
The patent merges the bending operation and heat treatment into a single integrated laser bending machine. The same laser that heats the wire to plastic deformation temperature for bending also serves as the heat treatment source that removes deformation defects. This consolidation eliminates the need for separate heat treatment equipment and reduces overall process complexity while maintaining material strength.
Solution Approach 2:
The patent performs heat treatment immediately after bending while the wire is still hot, before it cools down. This preliminary action ensures that any deformation defects are removed at the optimal moment when the material is most receptive to heat treatment, eliminating the need for separate subsequent heat treatment steps and reducing total processing time.
3Manufacturing precision
If the wire is bent very precisely into the interdental spaces, then the fit accuracy is improved, but the wire may break due to excessive deformation
Solution Approach 1:
The patent uses laser heating to temporarily change the wire's mechanical properties by raising its temperature to the plastic deformation point. This parameter change makes the wire more ductile and easier to bend into complex interdental shapes without breaking. After bending, the wire cools and regains its full strength, achieving both high precision fit and maintained integrity.
4Ease of manufacture
If a planar retainer is made from a flat sheet, then the manufacturing process is simple, but the retainer cannot optimally adapt to three-dimensional tooth surfaces and protruding edges disturb the wearer
Solution Approach 1:
The patent transitions from two-dimensional flat sheet metal to three-dimensional wire structures. The wire can be bent in multiple directions and dimensions to precisely follow the complex three-dimensional contours of tooth surfaces. This dimensional change enables optimal adaptation to teeth while maintaining manufacturing simplicity through the laser bending process.
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
The solution ensures high accuracy, comfort, and extended durability of the retainer by preserving the original material structure, allowing for customizable designs without residual stresses or defects, thus enhancing the fit and longevity.
Implementation Method 1
the wire is bent by means of a laser bending machine (20) wherein sections of the wire (21) are heated by means of a laser (22) to the plastic deformation temperature of the wire material
Implementation Method 2
the laser (22) also performs a heat treatment in order to remove deformation defects
Data Source
AI summary
A three-dimensional orthodontic retainer and an improved method for producing a three-dimensional orthodontic retainer so that the advantages of the known retainers and methods for their production are maintained, where the starting material of the three-dimensional orthodontic retainer is worked directly into the desired final form without deformation or other alterations in the material properties. At the same time, the retainer should have the least possible effect on the functions using the jaw such as eating, laughing, and on the aesthetics of the teeth.