Wire EDM Endodontic Blanks With Uniform Hardness Surface
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Solution Overview
Problem
Conventional methods for producing endodontic instruments are time-consuming and expensive, and they often result in instruments with limited surface configurations and mechanical disadvantages due to uneven hardness and flaking issues under mechanical stress.
Innovation Solution
The method involves using wire EDM technology to machine bars into endodontic instrument blanks, where the eroded material is redeposited with a surface hardness matching the original material, allowing for uniform hardness and improved elastic properties, and additional patterns can be applied for enhanced cutting functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional twisting or grinding methods are used to produce endodontic instruments, then cutting edges and grooves can be formed, but the production process is time-consuming and expensive
Solution Approach 1:
The patent replaces conventional mechanical twisting and grinding methods with wire EDM (electrical discharge machining). This substitution of mechanical processes with electrical discharge processes enables faster material removal and pattern formation, directly addressing the time-consuming nature of traditional manufacturing while maintaining precise cutting edge formation.
Solution Approach 2:
The patent utilizes parameter changes in the EDM process, specifically controlling the redeposition of eroded material through adjustments in electrical discharge parameters and liquid medium composition. By optimizing these parameters, the process achieves both high production efficiency and uniform surface hardness, resolving the contradiction between speed and quality.
2Productivity
If wire EDM technology is used to machine bars, then production is faster and more cost-effective, but eroded material deposits on the rod creating hardness variations
Solution Approach 1:
The patent applies parameter changes by controlling the wire EDM process conditions, including electrical discharge parameters and liquid medium composition. These parameter adjustments ensure that eroded material redeposits with hardness matching the base material, achieving uniform surface hardness while maintaining high production speed.
Solution Approach 2:
The patent addresses local quality issues by ensuring that the redeposited material layer has uniform hardness properties matching the base material throughout. This local uniformity in hardness prevents flaking and ensures consistent mechanical properties across the entire instrument surface.
3Strength
If eroded material is redeposited on the rod with higher hardness, then surface wear resistance increases, but the material flakes off under mechanical stress
Solution Approach 1:
The patent applies homogeneity by ensuring the redeposited material has essentially the same hardness as the base material. This uniformity in hardness throughout the structure prevents stress concentration at material interfaces, eliminating flaking issues while maintaining adequate wear resistance through the homogeneous reinforced structure.
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 the cost-effective and efficient production of endodontic instrument blanks with improved stability and functionality, preventing material flaking and ensuring homogeneous bending behavior under mechanical stress.
Implementation Method 1
The method includes the step of machining the at least one bar using wire EDM technology, wherein an EDM pattern is applied to the at least one rod. During machining using the wire EDM technique, material is eroded away from the bar.
Implementation Method 2
In the wire EDM technique, the material eroded away from the at least one rod is deposited again at least partially as a layer on the at least one rod. In this case, the layer of accumulated material has a surface hardness which essentially corresponds to the hardness of the material of the at least one rod.
Data Source
Figure 1
AI summary
The invention relates to a method for producing blanks for endodontic instruments (1), blanks, endodontic instruments (1), and a feeding device. The method comprises the steps of providing at least one rod (2) and machining the at least one rod (2) by wire EDM, whereby an EDM pattern (4) is applied to the at least one rod (2). The material eroded from the at least one rod (2) is at least partially redeposited as a layer onto the at least one rod (2). The layer of deposited material has a surface hardness that essentially corresponds to the hardness of the material of the at least one rod (2).