LED Tooth-Whitening Device with Intersecting Light Arcs
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Solution Overview
Problem
Current tooth-whitening devices using high-concentration peroxide and blue light are inconvenient, uncomfortable, and require frequent recharging or battery replacements, limiting their portability and effectiveness in delivering sufficient intensity and duration for comprehensive tooth bleaching.
Innovation Solution
A portable, self-contained tooth-whitening device with a compact housing and arrays of LEDs that deliver blue light at a peak intensity of 450-470nm, powered by primary or rechargeable batteries, allowing for multiple treatments without recharging, and designed for self-administration with minimal weight and hands-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-concentration peroxide is used to accelerate whitening, then whitening efficacy is improved, but tooth sensitivity and soft-tissue irritation increase
Solution Approach 1:
The patent introduces blue light as an intermediary energy source to activate the peroxide chemistry. Instead of relying solely on high peroxide concentration, the system uses light energy (450-470nm) to catalyze the whitening reaction, allowing lower peroxide concentrations to achieve comparable efficacy with reduced side effects
Solution Approach 2:
The patent changes the activation mechanism from chemical concentration-dependent to light energy-dependent. By controlling light intensity (minimum 100 mW/cm²) and wavelength (450-470nm), the system optimizes the peroxide reaction rate without increasing peroxide concentration, thereby maintaining whitening efficacy while reducing tissue irritation
2Productivity
If contact time is increased to improve whitening, then whitening efficacy is improved, but convenience and comfort deteriorate
Solution Approach 1:
The patent employs periodic pulsed light delivery (0.25-5 seconds on, 0.25-5 seconds off) during a 10-minute treatment period. This periodic action maintains effective whitening throughput while allowing brief rest intervals that improve patient comfort and reduce soft-tissue irritation compared to continuous application
Solution Approach 2:
The system applies blue light activation concurrently with peroxide application throughout the treatment period, maximizing the chemical reaction efficiency during the entire contact time. This preliminary and continuous activation ensures optimal utilization of the contact period, achieving high whitening efficacy without requiring extended wear time
3Productivity
If high-power light systems are used to accelerate bleaching, then whitening efficacy is improved, but portability and ease of use deteriorate
Solution Approach 1:
The patent segments the light delivery system into multiple independent LED arrays (first array and second array) that can be independently controlled. This segmentation allows the system to achieve high total light output through aggregation of multiple lower-power units, improving heat management and enabling a more compact, portable design compared to a single high-power light source
Solution Approach 2:
The patent replaces traditional high-power incandescent or halogen light systems with LED technology. LEDs provide the necessary blue light intensity (450-470nm, minimum 100 mW/cm²) with significantly lower power consumption and heat generation, enabling a portable, battery-operated device that maintains clinical efficacy while improving portability and user comfort
4Productivity
If treatment duration is extended to cover all anterior teeth, then comprehensive whitening is improved, but device weight and comfort deteriorate
Solution Approach 1:
The patent divides the treatment into two separate LED arrays: a first array for maxillary anterior teeth and a second array for mandibular anterior teeth. This segmentation allows the device to cover all anterior teeth comprehensively while maintaining a lightweight design, as each array can be optimized independently and the device can be repositioned rather than requiring excessive power for continuous full-arch illumination
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 device effectively accelerates tooth whitening by delivering sufficient light intensity to all anterior teeth surfaces, providing a full regimen of treatments with a lightweight, portable, and user-friendly design that minimizes discomfort and inconvenience.
Implementation Method 1
at least a first array of light-emitting diodes (LEDs) that are disposed in a first plane and at a front side of the housing
Implementation Method 2
The acceleration of this chemical reaction under the application of blue light is reported widely in the literature, with one hypothesis being that application of blue light elevates outer-shell electrons in C=C pairs to a higher quantum level, or energy state, increasing their ability to bond with available peroxide derivatives
Implementation Method 3
powered by primary or rechargeable batteries, allowing for multiple treatments without recharging
Data Source
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Figure 3~3A
Figure 4~5
AI summary
A portable self-contained tooth-whitening device (10) includes a compact housing structured and configured to be held in a fixed position adjacent to a human jaw during use; at least a first array of LEDs (20) disposed in a first plane at a front side of the housing (12) and arranged to deliver blue visible light or near-visible UV light of at least a threshold intensity to substantially all anterior surfaces of anterior maxillary teeth or anterior mandibular teeth of the human jaw, wherein the first array of LEDs (20) forms at least two intersecting arcs (30, 40), each of which is disposed in the first plane and has its own focal point (31, 41) located outside the device; and at least one battery cell powering the array of LEDs.