Dental File Asymmetric Trapezoidal Cross-Section

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Solution Overview

Problem

Dental files face challenges in achieving high flexibility, cutting properties, and breakage resistance while navigating complex root canal shapes, leading to difficulties in efficient and quick root canal formation.

Innovation Solution

A dental file with a working portion having a spiral trapezoidal cross-section, where vertexes of acute angle portions are located on an imaginary circle with a decreasing diameter, enhancing flexibility and cutting properties while reducing the risk of elongation and breakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the dental file has high flexibility to follow complicated root canal shapes, then it can navigate curved canals better, but cutting properties and breakage resistance may deteriorate

Engineering Contradiction:

ImproveflexibilityVSAvoidbreakage resistance

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The patent applies local quality by creating asymmetric trapezoidal cross-sections where different regions of the file have different properties. The first and second oblique sides have different lengths, creating zones with varying flexibility and strength characteristics along the file's length, allowing the tip to be flexible while maintaining overall structural integrity

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs asymmetry by designing the cross-section as a trapezoid rather than a symmetric shape. The asymmetric distribution of material (different oblique side lengths) creates inherent structural advantages that simultaneously provide flexibility in curved regions while maintaining breakage resistance through optimized stress distribution

Inventive Principle:

Principle #4Asymmetry

2Productivity

If the dental file has high cutting properties to enable appropriate cutting, then cutting efficiency improves, but flexibility and breakage resistance may worsen

Engineering Contradiction:

Improvecutting efficiencyVSAvoidflexibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The asymmetric trapezoidal cross-section creates local quality variations where specific regions are optimized for cutting while others maintain flexibility. The varying oblique side lengths create zones that can be tailored for different functions along the file length

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes geometric parameters by using non-equal oblique side lengths in the trapezoidal cross-section. This parameter variation allows optimization of cutting edges while maintaining overall file flexibility, as the asymmetric geometry distributes mechanical loads more effectively than symmetric designs

Inventive Principle:

Principle #35Parameter changes

3Productivity

If the dental file has high cutting properties with robust structure, then cutting performance improves, but risk of elongation and breakage increases

Engineering Contradiction:

Improvecutting performanceVSAvoidbreakage risk

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The asymmetric trapezoidal cross-section with unequal oblique sides creates inherent structural advantages that reduce elongation and breakage risk. The asymmetric geometry optimizes stress distribution during cutting operations, preventing concentrated loads that could lead to failure while maintaining cutting effectiveness

Inventive Principle:

Principle #4Asymmetry

4Ease of manufacture

If the dental file uses a parallelogram cross-section, then manufacturing is simple, but cutting properties and flexibility optimization is limited

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidcutting efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent transitions from a symmetric parallelogram to an asymmetric trapezoidal cross-section. This asymmetric design provides superior cutting properties and flexibility optimization while remaining manufacturable, as the trapezoidal shape can be produced using standard dental file manufacturing processes

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The trapezoidal cross-section with varying oblique side lengths allows local optimization of cutting edges and structural properties. Different regions of the file can be tailored for specific functions (cutting, flexibility, strength) while maintaining ease of manufacture through consistent cross-sectional geometry along the length

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11793603B2Dental file

Publication Date: 2023.10.24 MANI INC

AI summary

A dental file includes a working portion having a spiral shape, wherein a cross section perpendicular to a longitudinal direction of the working portion has a trapezoidal shape including an upper bottom, a lower bottom, and first and second oblique sides, vertexes at both ends of the lower bottom are located on an imaginary circle having a center at an axis in the longitudinal direction of the working portion, vertexes at both ends of the upper bottom are located inside the imaginary circle, and the imaginary circle has a diameter decreasing from a base end portion toward a leading end portion of the working portion.