Timing Differential Laser Caries Detection
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Solution Overview
Problem
Current dental caries detection methods lack sensitivity and information content, relying heavily on visual observation and traditional laser techniques that do not effectively differentiate carious areas from healthy tooth tissue.
Innovation Solution
A method and apparatus that direct excitation pulses of laser energy towards a tooth surface, measuring the time delay between the excitation and corresponding return pulses of fluorescent radiation to enhance caries detection, utilizing a laser device, delivery system, and detector to analyze the time delay for accurate identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional laser techniques are used for caries detection, then the detection process is simple, but the sensitivity and information content are insufficient
Solution Approach 1:
The patent applies periodic pulsed laser excitation instead of continuous illumination. The laser delivers short pulses at specific intervals, allowing the detection system to measure time-resolved fluorescence signals. This periodic action enables differentiation between early carious lesions and healthy tissue based on fluorescence decay characteristics, thereby improving detection sensitivity while maintaining manageable system complexity through controlled timing sequences.
Solution Approach 2:
The patent changes the temporal parameter of fluorescence detection by measuring the time delay between excitation pulses and return pulses. By analyzing fluorescence lifetime parameters rather than just intensity, the system can distinguish carious areas from healthy tooth tissue more accurately. This parameter change from intensity-only to time-resolved measurement enhances detection precision without requiring overly complex additional hardware.
2Measurement precision
If visual observation methods are used, then the equipment is simple, but the detection accuracy and information content are limited
Solution Approach 1:
The patent replaces manual visual observation with an automated optical detection system. Instead of relying on the dentist's visual inspection, the system uses laser excitation and fluorescence detection with electronic timing measurements. This substitution of mechanical/visual methods with optical-electronic measurement significantly improves detection accuracy by providing objective, quantifiable data about carious lesions while the automated timing measurement keeps the system relatively simple.
3Measurement precision
If traditional fluorescence detection is used, then the system is straightforward, but the ability to differentiate carious areas from healthy tissue is insufficient
Solution Approach 1:
By using periodic pulsed excitation and measuring the time-resolved fluorescence response, the system extracts additional information about the tissue's fluorescent properties. The time delay measurement provides insights into the molecular environment of fluorophores in carious versus healthy tissue, enabling better differentiation. This temporal information dimension enriches the data without requiring complex multi-parameter measurements simultaneously.
Solution Approach 2:
The system uses the measured time delay between excitation and return pulses as feedback to identify carious areas. By comparing the fluorescence lifetime characteristics against reference values for healthy tissue, the system can differentiate carious regions with higher accuracy. This feedback mechanism enhances information content about tissue health status while maintaining a relatively simple detection architecture.
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
This approach improves the sensitivity and accuracy of dental caries detection by analyzing the time delay between excitation and return pulses, allowing for early and reliable identification of carious areas, providing a more precise method for dental professionals.
Implementation Method 1
Carious areas of the tooth are known to respond to the light by issuing fluorescent radiation that is characteristic of caries and that differs in intensity and spectral distribution from radiation returned from a healthy tooth
Data Source
AI summary
A laser device is disclosed that directs light to a tooth and analyzes scattered light reflected from the tooth. The device measures a time delay between excitation and reflections of light. Reflected light is analyzed to determine a presence and extent of dental caries on the tooth.