Radially Compressible Endodontic Instruments With Precessional Cutting
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Solution Overview
Problem
Traditional endodontic instruments with coincident center of rotation and mass fail to engage the entire root canal wall, leaving 35% of the internal anatomy untouched, and are prone to cyclic fatigue and breakage due to continuous contact with canal walls.
Innovation Solution
Endodontic instruments with a radially compressible design, featuring a center of mass offset from the axis of rotation, allowing precessional cutting and intermittent engagement with canal walls, reducing cyclic fatigue and enhancing maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional endodontic instruments with coincident center of rotation and mass are used, then the instrument structure is simple and easy to manufacture, but the instrument fails to engage the entire root canal wall, leaving 35% of the internal anatomy untouched
Solution Approach 1:
The patent applies asymmetry by offsetting the center of mass from the center of rotation, creating an asymmetric mass distribution. This causes the instrument to engage the canal wall at multiple points during rotation, improving cleaning effectiveness while maintaining manufacturing simplicity through a straightforward offset design rather than complex multi-component structures
2Productivity
If traditional endodontic instruments with continuous contact with canal walls are used, then the instrument provides consistent cutting action, but the instrument is prone to cyclic fatigue and breakage
Solution Approach 1:
The patent implements periodic action through the offset center of mass design, which causes the instrument to intermittently engage and disengage from the canal wall during rotation. This periodic engagement pattern reduces continuous stress accumulation and cyclic fatigue while maintaining effective cutting action through the alternating contact phases
Solution Approach 2:
The patent changes the parameter of mass distribution by offsetting the center of mass from the center of rotation. This parameter change transforms the contact pattern from continuous to intermittent, reducing cyclic fatigue and improving instrument durability while preserving cutting effectiveness through the modified engagement dynamics
3Reliability
If radially compressible instruments with offset center of mass are used, then the instrument engages the entire root canal wall and reduces cyclic fatigue, but the instrument design becomes more complex
Solution Approach 1:
The patent achieves improved reliability through a relatively simple asymmetric design where the center of mass is offset from the center of rotation. This straightforward geometric modification provides the necessary intermittent engagement pattern to reduce cyclic fatigue without requiring complex mechanical components or multi-part constructions
Solution Approach 2:
The patent modifies the mass distribution parameter by creating an offset between the center of mass and center of rotation. This single parameter change enables the instrument to engage the entire root canal wall and reduce cyclic fatigue while maintaining a simple overall design structure that does not significantly increase device complexity
4Productivity
If radially compressible instruments are used, then the instrument cleans difficult-to-access areas and improves centering, but the manufacturing process becomes more difficult
Solution Approach 1:
The patent achieves improved access to difficult areas through a simple asymmetric offset design between the center of mass and center of rotation. This straightforward geometric modification enables the instrument to engage the entire root canal wall and improve centering without requiring complex manufacturing processes or specialized fabrication techniques
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 radially compressible instruments efficiently clean difficult-to-access areas, reduce the risk of instrument breakage, and preserve the original anatomy of the root canal by minimizing cyclic fatigue and improving centering.
Implementation Method 1
the endodontic instrument is radially compressed by a wall of the endodontic cavity space
Implementation Method 2
At least a portion of the center of mass path between the tip end and the shank end spirals around the first axis along a length of the first axis
Data Source
AI summary
Endodontic instruments are used to clean and enlarge the endodontic cavity space (ECS), also known as the root canal system, of a human tooth. This document describes novel endodontic instruments that are radially compressible, and methods for their use.