Fiber-Optic Tooth Pulp Vitality Detection for Gum Signal Isolation
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Solution Overview
Problem
Current laser Doppler flowmetry (LDF) techniques are inadequate for reliable tooth pulp vitality detection due to low sensitivity, susceptibility to blood flow from surrounding tissues, and the need for complex, expensive, and unwieldy equipment, particularly in large molars.
Innovation Solution
A novel system using a single-mode source line and multi-mode detector line with adjustable bandwidth and coherence length, combined with a reference path, to isolate tooth pulp flow signals and suppress interference from gum tissue, employing a low-cost, reusable probe for effective tooth pulp vitality detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional laser Doppler flowmetry is used for tooth pulp vitality detection, then the measurement can be obtained, but the sensitivity is insufficient and false readings occur due to blood flow from surrounding gum tissue
Solution Approach 1:
The optical path is segmented into multiple depth regions using a scanning mechanism that moves the focal plane through different depths of the tooth. This allows separate measurement of blood flow signals from the tooth pulp (inner region) and gum tissue (outer region), enabling the system to distinguish between the two and eliminate false readings.
Solution Approach 2:
The system adds the depth dimension to the traditional surface-level LDF measurement by implementing optical sectioning capability. This allows the measurement to be performed not just at the surface but at specific depths within the tooth structure, separating the signal source spatially along the optical path.
2Measurement precision
If conventional LDF techniques are used, then the device can be simple, but the sensitivity is low particularly for large molars and the equipment becomes expensive and unwieldy
Solution Approach 1:
The system uses a universal optical fiber probe that can detect blood flow at multiple depths within the tooth structure. This multi-functional capability allows a single device to handle various tooth types and sizes (including large molars) without requiring multiple specialized instruments, thereby improving sensitivity while controlling device complexity.
Solution Approach 2:
The patent introduces an optical sectioning intermediary mechanism that allows the light beam to be focused at specific depths within the tooth. This intermediary scanning system enables enhanced sensitivity for deep tissue detection in large molars without requiring a complete redesign of the entire LDF system.
3Ease of manufacture
If single mode fibers are used for LDF measurements, then the measurement can be performed, but complex single mode to single mode coupling is required for detachable reusable probes
Solution Approach 1:
The system employs disposable multi-mode fiber probes that can be easily sterilized and discarded after use. This eliminates the need for complex single-mode to single-mode coupling mechanisms while maintaining measurement capability. The disposable nature of the probes simplifies the overall system design and enables routine sterilization procedures.
Solution Approach 2:
The patent changes the fiber mode parameter from single-mode to multi-mode fibers for the probe tip. This parameter change allows for simpler coupling mechanisms and easier sterilization procedures while maintaining the ability to detect blood flow. The multi-mode fibers can be easily connected to standard connectors and withstand sterilization processes without requiring complex alignment procedures.
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 system enhances sensitivity and specificity for tooth pulp vitality detection, reducing false readings from gum tissue and enabling cost-effective, user-friendly pulp vitality testing.
Implementation Method 1
scattered light from the target volume and the output light through the reference path generate an interference signal at the detector
Implementation Method 2
Determining the Doppler shift in the returned signal due to motion of the optical scatterers in the sample, turns the OCT into a 3D imaging DOCT motion sensor
Data Source
AI summary
An apparatus provided for detecting tooth pulp vitality includes a handle, a pivot and a caliper. A pair of fiber optic lines pass through an interior of the handle, the pivot and the caliper. One of the fiber optic lines is a source line with a connector at an end of the source line and another of the fiber optic lines is a detector line with a connector at an end of the detector line. The source line is single mode in the handle and the detector line is multi mode. A system is also provided for detecting tooth pulp vitality that includes the apparatus. Additionally, a method is provided for detecting tooth pulp vitality that employs the apparatus.