Thermochromic Clear Aligners for Easy Finding After Removal
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Solution Overview
Problem
Clear aligners are difficult to find when removed from the mouth due to their near-invisibility, leading to frequent loss and disruption of orthodontic treatment.
Innovation Solution
Incorporation of thermally-sensitive thermochromic pigments that change color based on temperature, making the aligners visible when taken out of the mouth, with options for different color changes at body and beverage temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If clear aligners are made transparent and invisible when worn, then aesthetic appearance is improved, but visibility when removed deteriorates making them easy to lose
Solution Approach 1:
The patent applies thermochromic pigments that change color based on temperature. When the aligner is at body temperature (inside the mouth), the pigment remains transparent for aesthetic purposes. When removed and cools to ambient temperature, the pigment changes to a visible color, making the aligner easy to locate. This directly resolves the contradiction by using temperature-dependent color change to provide context-specific visibility.
Solution Approach 2:
The patent changes the optical parameter (transparency/visibility) of the aligner material based on temperature parameters. The thermochromic pigment alters the aligner's optical properties in response to temperature changes, transitioning from transparent at high temperature (body temperature) to colored at low temperature (ambient temperature), thus solving the visibility contradiction.
2Volume of moving object
If clear aligners are made small and compact, then comfort and fit are improved, but ease of locating when removed deteriorates
Solution Approach 1:
By incorporating thermochromic pigments, the patent enables small, compact aligners to become highly visible when removed through temperature-dependent color change. The pigment provides optical contrast that compensates for the small size, allowing users to easily locate the aligner despite its compact dimensions.
Solution Approach 2:
The patent applies thermochromic pigments to specific portions or patterns on the aligner surface, creating localized visible features that enhance detectability without requiring the entire aligner to be large. This allows compact aligners to have strategic visibility features that aid location while maintaining small overall size.
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
Enhances visibility of aligners outside the mouth, reducing the likelihood of loss and maintaining treatment continuity.
Implementation Method 1
a temperature-activated thermochromic pigment or dye impregnated within the aligner that causes the aligner to change color or become visible when it cools from body temperature to a lower temperature
Data Source
AI summary
A readily findable dental appliance is provided having a shell with a plurality of tooth-receiving cavities shaped to receive and resiliently reposition teeth in a patient's mouth from a first arrangement toward a second arrangement. At least one thermally-sensitive indicator is incorporated with at least a portion of the shell. The thermally-sensitive indicator includes a first temperature-activated thermochromic pigment, which preferably changes from a first visible color when below a first temperature to a second substantially clear color when above the first temperature. The pigment preferably includes a leuco dye microencapsulated in a polymer such as melamine formaldehyde polymer. A second temperature-activated thermochromic pigment may be provided that changes from a third substantially clear color when above a second temperature to a fourth visible color when below the second temperature, which is, e.g., approximately beverage-drinking temperature.