Parallelogram Cross-Section Endodontic Files for Curved Canal Navigation
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Solution Overview
Problem
Conventional endodontic instruments are inadequate for complete removal of pulp tissue and efficient enlargement of the root canal system, often leading to breakage and failure in navigating the narrow, curved canals, resulting in incomplete cleaning and potential tooth loss.
Innovation Solution
Development of rotatable endodontic files with parallelogram-shaped cross sections, featuring varying acute angles and C-shaped or concave geometries, made from superelastic materials like Nickel-Titanium alloys, which provide improved flexibility and resistance to cyclic fatigue, allowing for effective cleaning and shaping of curved canals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional endodontic instruments are used to clean and enlarge the root canal system, then the procedure can be performed with standard tools, but the instruments are inadequate for complete removal of pulp tissue and efficient enlargement of curved canals, leading to breakage and incomplete cleaning
Solution Approach 1:
The patent applies parameter changes by modifying the cross-sectional geometry of the instrument from conventional circular or polygonal shapes to parallelogram-shaped sections with varying acute angles along the length. This geometric parameter change enables the instrument to better conform to curved canal geometries while maintaining structural integrity, thereby simultaneously improving reliability and cleaning efficiency
Solution Approach 2:
The patent employs composite construction by combining superelastic Nickel-Titanium alloy materials with specific parallelogram cross-sectional geometries. This material-structure composite approach provides both the flexibility needed to navigate curved canals without breakage and the cutting efficiency required for complete pulp tissue removal, resolving the contradiction between reliability and productivity
2Ease of manufacture
If conventional endodontic instruments with standard cross sections are used, then manufacturing is simple, but they are predisposed to breakage and fail to navigate narrow, curved canals effectively
Solution Approach 1:
The patent changes the geometric parameters of the instrument cross-section from conventional shapes to parallelogram configurations with varying acute angles. While this increases manufacturing complexity slightly, it dramatically improves reliability by distributing stress more effectively along the instrument length, reducing breakage in curved canals. The parallelism of opposite sides maintains relatively simple manufacturing processes
Solution Approach 2:
The use of superelastic Nickel-Titanium alloys combined with parallelogram cross-sections creates a composite structure that enhances fatigue resistance and breakage resistance. The material properties complement the geometric design, allowing the instrument to withstand cyclic loading in curved canals while maintaining manufacturability through established metal forming processes
3Ease of operation
If conventional endodontic instruments are used, then the procedure follows standard protocols, but they cannot effectively clean curved canals and may cause injury to the tooth or alter natural anatomy
Solution Approach 1:
The parallelogram cross-section with varying acute angles allows the instrument to better adapt to curved canal geometries while maintaining standard rotational cutting actions. This geometric modification improves the instrument's ability to follow curved paths without deviating from standard operational protocols, thereby enhancing cleaning completeness while maintaining ease of operation
Solution Approach 2:
The patent applies curvature principles by designing the parallelogram cross-section to better conform to the curved geometry of natural canals. The varying acute angles along the instrument length allow it to navigate curves more effectively, improving cleaning reliability in curved canals while maintaining compatibility with standard operating procedures
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 new endodontic files demonstrate higher cutting efficiency and reduced likelihood of breakage, effectively navigating and cleaning curved canals with improved flexibility and resistance to fatigue, enhancing the success of root canal procedures.
Implementation Method 1
made from superelastic materials like Nickel-Titanium alloys, which provide improved flexibility and resistance to cyclic fatigue
Data Source
AI summary
A rotatable endodontic file for cleaning/shaping a tooth root canal that includes an elongated shaft having a proximal end portion, a distal end and a tapered working portion having a rotational axis, the working portion extending from the proximal portion to the distal end; the external surface of the shaft working portion having a plurality of parallelogram-shaped cross sections along the working portion.