Non-linear Orthodontic Stop for Archwire Retention
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Solution Overview
Problem
Conventional orthodontic archwire stops are too small and prone to sliding, leading to unpredictable friction and frequent disengagement during orthodontic treatment, making them difficult to handle and install effectively.
Innovation Solution
The introduction of non-linear archwire stops that create a bending moment through a curved or asymmetrical path, providing consistent frictional engagement by resisting the archwire's elastic deformation, thus maintaining the stop's position during handling and treatment while allowing easy repositioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional small diameter tube stops are used on archwires, then the stops can be positioned between brackets to limit archwire movement, but the stops are prone to sliding along the archwire due to their small size and weight, causing unpredictable friction and frequent disengagement
Solution Approach 1:
The stop is formed with a non-linear curved path through its tubular structure, creating a bending moment on the archwire as it passes through. This curvature generates increased frictional engagement between the archwire and stop, preventing the stop from sliding along the wire while maintaining reliable position stability during orthodontic treatment
2Reliability
If the stops are made smaller to fit between brackets, then they can effectively limit archwire movement to prevent disengagement, but they become difficult to see and handle during clinical installation
Solution Approach 1:
The non-linear curved configuration of the stop creates a bending moment that increases frictional engagement with the archwire. This allows the stop to remain small enough to fit between brackets for effective retention while the curved geometry provides tactile feedback and visual distinction that improves detectability and handling during clinical procedures
3Ease of manufacture
If the stops are pre-threaded on archwires in clinical settings, then they can be installed conveniently, but they tend to slide freely along the archwire under their own weight before being secured
Solution Approach 1:
The stop is pre-formed with a non-linear curved path that creates a bending moment on the archwire. This curvature generates sufficient frictional engagement to prevent the stop from sliding freely along the archwire during pre-threading and installation, while still allowing the stop to be conveniently positioned on the wire before final securation
Solution Approach 2:
The stop is pre-formed with the curved geometry that creates the bending moment and frictional engagement before installation. This preliminary formation of the friction-generating geometry ensures the stop maintains its position during handling and installation without requiring additional securing mechanisms
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 non-linear stops ensure predictable frictional engagement, preventing accidental disengagement and facilitating easier handling and adjustment during orthodontic procedures, minimizing the risk of stops falling off the archwire and maintaining stability throughout treatment.
Implementation Method 1
The non-linear stops ensure predictable frictional engagement, preventing accidental disengagement
Implementation Method 2
providing consistent frictional engagement by resisting the archwire's elastic deformation
Data Source
AI summary
An archwire stop defines a non-linear path through the stop that results in a bend moment between an orthodontic stop and the portion of an orthodontic archwire passing through the stop. The bend moment is accommodated by elastic deformation of the archwire and stop, resulting in a predictable frictional engagement between the stop and the archwire that is useful in maintaining a stop mounted on an archwire during packaging, shipping and handling in a clinical setting. A non-linear path through an archwire stop may be created by a non-linear tubular stop or may be created by appropriate internal features of the stop. The non-linear path through the stop may be selected so that the frictional engagement is greatest toward the free ends of the archwire, preventing the stop from sliding off the ends of an archwire, while permitting adjustment of the stop at the front of the mouth during patient treatment.