Orthodontic Bracket Archwire Control Structure
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Solution Overview
Problem
Current orthodontic brackets lack consistent rotational control of teeth during treatment, leading to unpredictable torque application and extended treatment times due to point contact between the archwire and closure members, which can shift during treatment.
Innovation Solution
The orthodontic bracket design incorporates a closure member with archwire control structures featuring projecting portions and recessed areas that ensure consistent contact between the archwire and the bracket, limiting contact to specific locations to maintain a predictable moment arm and torque application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a movable closure member is used to retain the archwire in the archwire slot, then the archwire can be secured in place, but the contact point between the archwire and closure member shifts during treatment, resulting in unpredictable torque application and poor rotational control
Solution Approach 1:
The closure member incorporates specific structural features (projecting portions and recessed areas) at localized positions to create predetermined contact points with the archwire. This local quality enhancement ensures that contact occurs only at designated areas, preventing shifting and providing consistent rotational control while maintaining overall structural simplicity.
2Ease of operation
If the closure member allows the archwire to be spaced from the base surface of the archwire slot, then insertion is easier, but rotational control of the tooth is reduced
Solution Approach 1:
The closure member is segmented into distinct functional zones: projecting portions that contact the archwire for rotational control, recessed areas that accommodate the archwire for easy insertion, and a base surface that provides structural support. This segmentation allows the archwire to be easily inserted while ensuring controlled contact points for reliable rotational control.
3Reliability
If active ligation is used to force the archwire to the base surface of the archwire slot, then rotational control is improved, but the treatment time increases due to extended adjustment periods
Solution Approach 1:
The closure member's结构设计 enables it to automatically maintain consistent contact with the archwire at predetermined points without requiring manual adjustment. The projecting portions and recessed areas work together to self-regulate the contact points, providing predictable torque application and rotational control throughout treatment, thereby reducing the need for frequent adjustments and shortening treatment time.
Data Source
AI summary
An orthodontic bracket includes a bracket body and a ligating member. The ligating member retains an archwire in an archwire slot and includes archwire control structure including projecting portions spaced apart in a mesial-distal direction with a recessed area therebetween. The recessed area and the projecting portions overlie the archwire slot. The recessed area may include a flat or a curved surface in a mesial-distal direction. The recessed area and projecting portions may define a radius of curvature that is less than the radius of curvature of the archwire seated in the slot. The archwire contacts one or both the projecting portions resulting in a larger moment arm and better rotational control of the bracket with the force applied by the archwire.