Endodontic Handpiece Dual-Drive Vibration for Curved Root Canals

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Solution Overview

Problem

Endodontic handpieces face challenges in efficiently navigating the complex spatial curvatures of root canals during root canal therapy, leading to issues such as file breakage, uneven canal wall preparations, and improper shaping.

Innovation Solution

The endodontic handpiece system incorporates a handle assembly with a chuck assembly and a dual drive system, enabling simultaneous rotation and vibration of the drill bit, along with the option for pressurized fluid flow, to enhance navigation and precision in root canal shaping.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual rotation of files is used in root canal therapy, then the dentist has direct control over the shaping process, but file breakage occurs and uneven canal wall preparations result due to complex spatial curvatures

Engineering Contradiction:

Improvefile durabilityVSAvoidcontrol over shaping process

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent applies mechanical vibration to the endodontic file through a vibration generator that produces ultrasonic or sonic vibrations. This vibration reduces friction between the file and canal walls, prevents file binding in curved canals, and eliminates the sticking that leads to file breakage while maintaining dentist control through automated operation.

Inventive Principle:

Principle #18Mechanical vibration

Solution Approach 2:

The patent replaces the purely manual mechanical rotation system with an automated motorized system that incorporates vibration technology. This substitution allows the file to navigate complex spatial curvatures more effectively by combining rotational motion with vibrational motion, reducing manual dexterity requirements while improving reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If rotary handpieces are used for root canal shaping, then efficiency is improved, but file breakage and uneven canal wall preparations occur due to inability to navigate spatial curvatures

Engineering Contradiction:

Improveroot canal shaping efficiencyVSAvoidcanal wall preparation uniformity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The vibration generator produces ultrasonic or sonic vibrations that are transmitted to the endodontic file, reducing friction and heat generation during rotation. This allows the file to navigate curved canals more smoothly, maintaining uniform canal wall preparation while improving shaping efficiency through automated operation.

Inventive Principle:

Principle #18Mechanical vibration

Solution Approach 2:

The patent changes the operational parameters by introducing vibrational motion in addition to rotation. The vibration frequency and amplitude can be adjusted to optimize performance for different canal configurations, allowing efficient shaping while maintaining precision in complex spatial curvatures.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If high-speed rotation is used for efficient dentin removal, then productivity increases, but heat generation and file binding in curved canals worsen

Engineering Contradiction:

Improvedentin removal rateVSAvoidheat generation in canal

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The vibration generator produces ultrasonic or sonic vibrations that reduce friction between the rotating file and canal walls. This vibration dissipates heat and prevents file binding, allowing high-speed rotation to continue efficiently without excessive heat generation or file binding in curved canals.

Inventive Principle:

Principle #18Mechanical vibration

Solution Approach 2:

The vibrational motion introduces periodic oscillations to the continuous rotation, creating cycles of engagement and disengagement that prevent continuous friction and heat buildup. This periodic action allows sustained high-speed operation while controlling temperature rise.

Inventive Principle:

Principle #19Periodic action

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 system improves the efficiency and precision of root canal treatment by reducing file breakage and ensuring uniform canal wall preparation, thereby preserving tooth longevity and function.

Implementation Method 1

a second drive system for imparting a vibratory force to the chuck assembly

Methodology Applied

Scientific EffectVibration: Vibration

Data Source

PatentUS12539201B2Endodontic handpiece systems and methods

Publication Date: 2026.02.03 INNOVATIVE BIOCERAMIX

AI summary

An endodontic handpiece comprises a handle assembly and an endodontic tool. The handle assembly comprises a handle housing, a chuck assembly, a bearing system for supporting the chuck assembly for rotation relative to the handle housing, a first drive system for rotating the chuck assembly, and first and second drive systems. The endodontic tool defines a support portion and a working portion. The chuck assembly transfers movement of the chuck assembly to the endodontic tool. The endodontic handpiece operates in at least one of first, second, and third modes in which the first drive system causes rotation of the endodontic tool through the chuck assembly, the second drive system causes vibration of the endodontic tool, and/or the first drive system causes rotation of the endodontic tool through the chuck assembly.