Endodontic Instrument Blanks with EDM-Machined Uniform Hardness
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Solution Overview
Problem
Conventional methods for producing endodontic instruments are time-consuming, cost-intensive, and result in limited surface configurations with mechanical disadvantages due to high temperature processes and material hardness issues.
Innovation Solution
The method involves using erosion techniques like electrical discharge machining to create endodontic instrument blanks with a homogeneous hardness by removing and re-depositing material, allowing for efficient production of cost-effective instruments with improved stability and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional methods (continuous twisting or grinding) are used to produce endodontic instruments, then cutting edges and grooves can be formed, but the production is time-consuming and cost-intensive
Solution Approach 1:
The patent replaces conventional mechanical twisting and grinding methods with electrical discharge machining (EDM), an electro-thermal process. This substitution eliminates the need for mechanical contact between tool and workpiece, enabling faster material removal and more complex surface configurations without increasing mechanical complexity
Solution Approach 2:
The invention changes the production parameters by using electrical discharge machining with controlled voltage, current, and pulse duration to erode material precisely. This allows rapid formation of cutting edges and grooves while maintaining dimensional accuracy, directly addressing the time-consuming nature of conventional mechanical methods
2Ease of manufacture
If high temperature processes are used to produce superelastic instruments, then the material can be worked, but the processes have corroding effects and mechanical disadvantages
Solution Approach 1:
The patent changes the thermal parameters by conducting electrical discharge machining at or near room temperature, eliminating the high temperature exposure that causes corrosion and material degradation. The electro-thermal process generates localized heat only at the discharge point, which immediately dissipates, preventing bulk material heating and associated damage
Solution Approach 2:
The invention replaces thermal-mechanical working processes with an electrical field-based erosion process. This substitution eliminates the need for high temperature phase transformations and associated corrosion risks, while still enabling effective material shaping through controlled electrical discharge
3Ease of manufacture
If material is eroded by wire erosion, then cutting edges can be formed, but the eroded material deposits as a layer with higher hardness that causes mechanical disadvantages
Solution Approach 1:
The patent extracts the eroded material from the machining zone using a suction device during the electrical discharge machining process. This prevents the eroded particles from re-depositing on the workpiece surface, eliminating the formation of hard, brittle layers that would compromise mechanical performance
Solution Approach 2:
The invention introduces a dielectric fluid medium that carries away eroded particles from the discharge zone. This intermediary fluid prevents direct contact between eroded material and the workpiece surface, avoiding unwanted re-deposition while maintaining the electrical discharge process
4Adaptability or versatility
If conventional production methods are used, then instruments can be manufactured, but the surface configurations are limited
Solution Approach 1:
The patent replaces mechanical tool-contact methods with electrical discharge machining, which uses electrical fields to erode material. This allows for complex three-dimensional surface configurations, helical grooves, and cutting edges to be formed without mechanical tool interference, greatly expanding surface configuration possibilities
Solution Approach 2:
The invention utilizes controllable electrical discharge parameters (voltage, current, pulse width, frequency) to create varied surface configurations. By adjusting these parameters, different groove patterns, cutting edge geometries, and surface finishes can be achieved with a single process setup, increasing versatility without adding mechanical complexity
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 approach enables rapid, cost-effective production of endodontic instruments with uniform hardness and elastic properties, reducing mechanical stress and cracking, and enhancing the instrument's performance in cleaning and widening root canals.
Implementation Method 1
material is removed from a rod by an erosion method, preferably a method selected from the group consisting of electrical discharge machining, wire electrical discharge machining, electrical discharge grinding and electro-chemical machining
Implementation Method 2
In erosion methods like wire erosion, the material eroded away from the at least one rod at least partially deposits again as a layer on the at least one rod
Implementation Method 3
The method further comprises the step of removing substantially all of said re-deposited layer from the at least one rod
Data Source
AI summary
The invention relates to a blank for an endodontic instrument, obtainable by machining at least one rod by means of wire erosion, preferably selected from the group consisting of electrical discharge machining, wire electrical discharge machining, electrical discharge grinding and electro-chemical machining, wherein an erosion pattern is applied to the at least one rod, wherein the blank has a homogenous hardness.