Flexible Polymer Activator for Root Canal Smear Layer Removal

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Solution Overview

Problem

Current endodontic tools are inadequate for thoroughly removing the smear layer from root canal walls, leading to incomplete cleaning and potential bacterial leakage, and existing devices are often too large or inflexible to reach all areas of the canal, with cumbersome attachment mechanisms.

Innovation Solution

A flexible, non-metallic, endodontic activator with a tapered design and snap-on coupler that can be connected to sonic or ultrasonic drivers, allowing for precise agitation and irrigation within the root canal to dislodge and remove the smear layer without damaging the canal walls.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional metal files or ultrasonic instruments are used to remove smear layer, then cleaning effectiveness is improved, but risk of iatrogenic events (broken instruments, ledges, perforation) increases

Engineering Contradiction:

Improvecleaning effectivenessVSAvoidiatrogenic events

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces traditional mechanical cutting instruments (metal files, ultrasonic tips) with a chemically-active flexible polymer system. The polymer activator delivers concentrated irrigation solutions directly to smear layer deposits through its flexible structure, enabling chemical dissolution rather than mechanical removal, thereby eliminating instrument breakage and canal wall damage risks

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical state and delivery method of irrigation solutions by incorporating them into a flexible polymer matrix. This allows the irrigation solution to be delivered in a concentrated, controlled manner directly at the smear layer interface, enhancing chemical cleaning effectiveness without requiring aggressive mechanical forces

Inventive Principle:

Principle #35Parameter changes

2Reliability

If irrigating solutions are used to remove smear layer, then cleaning is achieved, but insufficient contact with canal walls results in incomplete removal

Engineering Contradiction:

Improvesmear layer removalVSAvoidsolution activation

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The flexible polymer activator is self-activating through its interaction with irrigation solutions. When irrigation solution contacts the polymer, it automatically softens and activates the material, enabling it to conform to and contact canal walls without requiring external activation mechanisms or complex operational steps

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent employs a flexible polymer activator that can conform to the irregular surfaces of root canal walls. This flexibility allows the material to make intimate contact with difficult-to-reach areas and adhere to canal walls, ensuring comprehensive smear layer exposure to irrigation solutions

Inventive Principle:

Principle #30Flexible shells and thin films

3Strength

If metal instruments are used for canal cleaning, then structural strength is maintained, but flexibility to reach all canal areas is reduced

Engineering Contradiction:

Improveinstrument strengthVSAvoidflexibility

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The patent creates a composite system combining a flexible polymer matrix with irrigating solutions. The polymer provides structural integrity sufficient for delivery while its inherent flexibility allows it to navigate curved and complex canal geometries, achieving both strength and adaptability that metal instruments cannot provide

Inventive Principle:

Principle #40Composite materials

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 tool effectively removes the smear layer and organic debris from the root canal system, reducing the risk of bacterial leakage and improving the success rate of endodontic treatments by ensuring thorough cleaning and minimizing iatrogenic events.

Implementation Method 1

The activator is adapted to be connected to a sonic or ultrasonic driver to be driven thereby

Methodology Applied

Scientific EffectSonic vibration: Ultrasonic Vibration

Implementation Method 2

produce vibrations and fluid movement

Methodology Applied

Scientific EffectMechanical vibration: Vibration

Implementation Method 3

a solution of NaOCl is liberally irrigated into the root canal space where its solvent action facilitates the digestion and removal of pulp, bacteria, viruses, spores, endotoxins and other irritants

Methodology Applied

Scientific EffectChemical dissolution: Solvation

Data Source

PatentUS8235719B2Apparatus for cleaning a root canal system

Publication Date: 2012.08.07 TULSA DENTAL PRODUCTS LLC

AI summary

An endodontic tool is provided to facilitate the removal of the smear layer and to enhance deep lateral cleaning of a root canal system. The tool includes a sonic driven activator which is made from a strong, flexible, non-metallic, and non-cutting material. The activator can be smooth. A snap-on coupler is adapted to attach the tool to a driver via a snap on action and without the use of tools. The driver will vibrate, sonically or ultrasonically, the flexible activator within a root canal of a tooth. The tool can be provided with fluid passages which allow for irrigating reagents to be delivered through the activator and into the root canal space during endodontic procedures.