Conductive Gutta Percha Point for Real-Time Root Canal Length Measurement
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Solution Overview
Problem
Current methods for determining the working length for root canal gutta-percha filling are imprecise, often leading to underfilling or overfilling, as they rely on radiographs and apex locators used before the obturation process, without real-time feedback during filling.
Innovation Solution
An apparatus utilizing a conductive gutta-percha point that can be used to determine the obturation length in real-time during the root canal filling process, by forming a conductive path between the gutta-percha point and the apex locator, allowing for precise measurement and filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radiographs and apex locators are used before obturation to determine working length, then the working length can be estimated, but the measurement precision is insufficient leading to underfilling or overfilling
Solution Approach 1:
The conductive gutta-percha point allows the working length to be determined in advance during the obturation process itself, before the final filling is completed. This preliminary measurement action enables the clinician to verify the correct length before committing to the final fill, preventing both underfilling and overfilling.
Solution Approach 2:
The apparatus provides real-time electrical conductivity feedback during the gutta-percha insertion process. As the conductive gutta-percha point is inserted, the apex locator continuously monitors electrical contact with the periodontal ligament, providing immediate feedback on the working length to guide the obturation process accurately.
2Ease of operation
If traditional apex locators are used with separate probes, then electrical resistance can be measured, but the device complexity increases and real-time measurement during filling is not achieved
Solution Approach 1:
The invention merges the measurement function and the filling material into a single integrated tool. The gutta-percha point itself becomes both the obturation material and the measurement probe, eliminating the need for separate measurement devices and simplifying the overall procedure.
Solution Approach 2:
The conductive gutta-percha point serves multiple functions simultaneously: it acts as the obturation material to seal the canal, as the measurement probe to determine working length, and as the conductor for electrical resistance measurement. This multi-functionality reduces device complexity while maintaining measurement capability.
3Productivity
If population-based deductions from radiographic apex are used to determine working length, then a general estimate can be obtained, but the measurement precision is insufficient for individual canal complexity
Solution Approach 1:
The conductive gutta-percha point enables the canal itself to provide the measurement information through its electrical properties. The natural electrical resistance characteristics of the canal walls and periodontal ligament are utilized directly, eliminating the need for external population-based reference data and providing individualized precise measurement.
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 solution enables accurate determination and maintenance of the correct obturation length during the root canal filling process, reducing the risk of underfilling or overfilling and improving the reliability of root canal treatments.
Implementation Method 1
The structure of the root canal walls possesses a resistance to electrical current. On the other hand, the current can pass through the periodontium. By using an electrical conductor coupled to a power source and current meter, apex locators can detect the difference in the resistance between an electric insulator (root canal walls) and an electric conductor (periodontium) in the apical foramen.
Implementation Method 2
a conductive layer, wherein the conductive layer comprises a conductive material... one or more conductive paths are formed on the body extending between the conductive layer of the neck and the conductive layer of the tip
Data Source
AI summary
A gutta percha point and an apparatus for measuring the length of a root canal in a root canal procedure. The gutta percha point includes a head, a neck, a body, and a tail. The neck has a coating of conductive material to which one electrode of the apparatus can be electrically clamped. The tip also includes a layer of conductive material. One or more conductive paths are formed integral to the body extending between the neck and the tail. The gutta percha cone can be used to measure the length of the root canal as well as for filling the tooth cavity.