Root Canal Cutting Tool Reversal for Breakage Control
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Solution Overview
Problem
Dental treatment apparatuses face issues with cutting tools being twisted and broken due to incorrect attachment, leading to inefficient or unintended operations, especially when the wrong cutting tool is attached to the head.
Innovation Solution
A dental treatment apparatus with a drive unit, controller, and position detector that performs fail-safe control by detecting the tip end of the cutting tool within the root canal and reversing the drive direction when the tool reaches a reference position or exceeds a certain load, preventing further advancement towards the root apex.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutting tool is driven continuously in one direction to improve cutting efficiency, then the cutting speed increases, but the cutting tool is more prone to twisting and breaking
Solution Approach 1:
The patent implements periodic reversal of rotation direction every predetermined number of rotations. The controller monitors the rotation count and automatically switches between clockwise and counterclockwise rotation, preventing the cutting tool from twisting and breaking while maintaining cutting efficiency through continuous forward motion.
Solution Approach 2:
The patent uses a rotation detection mechanism that provides feedback on the number of rotations completed. Based on this feedback, the controller determines when to reverse the rotation direction, ensuring the cutting tool operates within safe rotational limits while maintaining productive cutting speed.
2Reliability
If the rotation direction is reversed frequently to prevent cutting tool breakage, then the cutting tool reliability improves, but the cutting efficiency decreases
Solution Approach 1:
The patent establishes a periodic reversal mechanism that switches rotation direction every predetermined number of rotations. This controlled periodic action prevents tool breakage through reduced torsional stress while minimizing the impact on cutting efficiency by maintaining consistent forward progression.
Solution Approach 2:
The controller performs preliminary detection of rotation count and proactively reverses direction before the cutting tool reaches a critical state that would cause breakage. This preventive approach maintains tool reliability without interrupting the cutting process or significantly reducing efficiency.
3Productivity
If the cutting tool is driven at high speed to improve productivity, then the cutting speed increases, but the risk of unintended operation increases when wrong tool is attached
Solution Approach 1:
The patent incorporates a rotation direction detection mechanism that provides feedback to the controller. The controller uses this feedback to monitor whether the cutting tool is rotating in the expected direction and can detect when a wrong tool is attached, allowing it to adjust or stop operation to prevent harmful unintended actions.
Solution Approach 2:
The controller performs preliminary detection of rotation characteristics before full-speed operation begins. By analyzing the rotation pattern in advance, the system can identify incorrect tool attachment and prevent high-speed operation that would cause harmful effects, while allowing normal high-speed cutting when the correct tool is properly attached.
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
Ensures safe and efficient cutting of the root canal by preventing the cutting tool from being twisted or broken, even when the wrong tool is attached, through fail-safe control mechanisms.
Implementation Method 1
a position detector that detects a position of a tip end of the cutting tool within a root canal by electric root canal length measurement
Implementation Method 2
a load detector that detects a load applied to the cutting tool
Data Source
AI summary
A dental treatment apparatus according to the present invention includes a drive unit that includes a micromotor, a motor driver, and the like, a controller, and a root canal length measurement circuit. The controller controls the cutting tool to be held at a head forward driven in a direction of cutting of an object to be cut. The controller also controls the cutting tool to be reverse driven in a direction reverse to forward rotation drive when the cutting tool is forward driven and the root canal length measurement circuit detects a tip end of the cutting tool reaching a reference position. The controller further carries out a fail-safe control when the cutting tool is reverse driven and the root canal length measurement circuit detects movement of the tip end of the cutting tool toward a root apex position.