Endodontic Apex Detection Using Decoupled Impedance Components
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Solution Overview
Problem
Existing endodontic treatment methods rely heavily on sinusoidal waves to determine the capacitive portion of the impedance to locate the apex of a root canal, but fail to effectively utilize the resistive portion to indicate the approaching apex, risking instrument tip penetration beyond the canal apex.
Innovation Solution
An instrument that generates a periodic control signal with pseudo-sinusoidal and sinusoidal components to independently detect and display the resistive and capacitive components of the impedance, allowing real-time visualization of the apex approach without modifying the canal morphology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sinusoidal waves are used to determine the capacitive portion C of the impedance, then the apex position can be located, but the resistive portion R cannot be effectively utilized to indicate the approaching apex
Solution Approach 1:
The patent segments the impedance measurement into two independent components: capacitive (C) and resistive (R). By using a periodic control signal with multiple frequency components, the system separately detects each portion of the impedance independently, allowing both C and R to provide useful information about apex proximity without interfering with each other.
Solution Approach 2:
The patent changes the frequency parameter of the control signal to differentiate between capacitive and resistive responses. By analyzing the system's response at different frequencies, the device can distinguish and independently measure the capacitive portion (which increases near the apex) and the resistive portion (which provides additional proximity information), thereby utilizing previously wasted resistive data.
2Measurement precision
If complex mathematic algorithms are used to determine apex position using only sinusoidal waves, then the apex can be located, but the device complexity increases
Solution Approach 1:
The patent replaces complex mathematical algorithms with a more straightforward electrical measurement approach. Instead of using sophisticated computational methods to extract apex position from sinusoidal wave responses, the system directly measures impedance components (C and R) at specific frequencies, simplifying the processing requirements while maintaining measurement precision.
3Productivity
If the instrument tip is allowed to pass beyond the apex, then the canal can be fully cleaned, but the canal morphology is modified
Solution Approach 1:
The patent implements a feedback mechanism that provides real-time information about the instrument tip's distance from the apex through independent detection of capacitive and resistive impedance components. This feedback allows the operator to stop the instrumentation exactly at the apex position, achieving complete canal cleaning without over-instrumentation that would alter the canal's natural morphology.
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
Enables precise determination of the root canal apex by decoupling the complex algorithms needed for sinusoidal wave analysis, providing real-time feedback on apex proximity and distance, thus preventing instrument tip penetration.
Implementation Method 1
The equivalent electric scheme of the localization system provides that the impedance existing between the endodontic instrument and the lip hook is constituted by a condenser 'C' in parallel to a resistance 'R'
Implementation Method 2
the impedance existing between the endodontic instrument and the lip hook is constituted by a condenser 'C' in parallel to a resistance 'R'. The determination of the parameters 'C' and 'R' at the position of the apex of the root canal
Data Source
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AI summary
The present invention relates to an instrument for detecting the apex position, and to a methodology implemented thereby, having the advantage to allow showing the approaching of the root canal apex during the endodontic treatment, and therefore showing to have reached it, thus avoiding to modify the morphology thereof.