Root Canal Cutting Tool Rotation Control to Prevent Fracture
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Solution Overview
Problem
Existing dental treatment apparatuses face challenges in preventing cutting tool fracture while maintaining efficiency during root canal enlargement, as they either fail to switch from forward to reverse rotation effectively due to improperly set reference loads, leading to either tool fracture or inefficient cutting.
Innovation Solution
A dental treatment apparatus with a drive unit, control unit, load detector, and cumulative rotation amount calculator that continues forward rotation until a predetermined angle is reached and switches to reverse rotation based on cumulative rotation, ensuring the cutting tool operates within safe rotation ranges to prevent fracture and optimize cutting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the reference load is set large, then the cutting tool can operate continuously in forward rotation, but the cutting tool fractures due to excessive load
Solution Approach 1:
The control unit continuously monitors the load on the cutting tool via the load detector and dynamically adjusts rotation direction based on real-time load conditions. When load exceeds the reference value, the system automatically switches from forward to reverse rotation, creating a feedback loop that prevents tool fracture while maintaining efficient cutting operation.
2Reliability
If the reference load is set small, then the cutting tool fracture is prevented, but reverse rotation drive is frequently repeated reducing cutting efficiency
Solution Approach 1:
The system dynamically adjusts the reference load value based on the cumulative rotation amount. As the cutting tool rotates more, the reference load threshold increases, allowing more aggressive cutting operations. This dynamic adjustment optimizes the balance between preventing tool fracture and maintaining cutting efficiency throughout the entire cutting process.
Solution Approach 2:
The reference load parameter is changed dynamically during operation based on cumulative rotation amount. The control unit adjusts this parameter to increase as cumulative rotation increases, transforming a static safety threshold into a dynamic one that adapts to the cutting progress and tool condition.
3Productivity
If forward rotation is continued beyond the angle of break, then cutting efficiency is maintained, but the cutting tool fractures
Solution Approach 1:
The system applies preliminary anti-action by switching to reverse rotation before the cutting tool reaches its breaking angle. The control unit monitors cumulative rotation amount and proactively changes rotation direction when approaching the critical angle, preventing the harmful effect of excessive torsional stress that would lead to tool fracture.
Data Source
AI summary
A root canal treatment instrument 100 continues drive of a cutting tool 5 in forward rotation drive until reaching 180 degrees, and when a load applied to the cutting tool 5 is equal to or greater than a reference load, drive of the cutting tool 5 is switched to reverse rotation drive until reaching 90 degrees. In the root canal treatment instrument 100, when a cumulative amount of rotation is equal to or greater than a reference amount of rotation, change to a drive pattern is made, forward rotation drive is continued until reaching 90 degrees, and when a load applied to the cutting tool 5 is equal to or greater than the reference load, drive of the cutting tool 5 is switched to reverse rotation drive until reaching 180 degrees.