Self-Ligating Bracket Sliding Cover and Locking Tab
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Solution Overview
Problem
Existing self-locking orthodontic brackets are often complex, expensive to manufacture, and prone to failure due to multiple parts and poor design, leading to issues with patient comfort and effectiveness in orthodontic treatment.
Innovation Solution
A self-ligating orthodontic bracket with a sliding archwire cover and flexible locking tab that engages a ridge on the archwire slot, providing a smooth surface and enhanced locking mechanism without sharp edges, allowing for easy installation and adjustment of archwires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a sliding cover design is used to simplify the bracket structure, then device complexity is reduced, but the top surface may become rough causing patient discomfort
Solution Approach 1:
The patent applies local quality by providing a smooth coating layer specifically on the top surface of the sliding cover, while the underlying structure can remain simple. This localized treatment ensures patient comfort only where needed (the surface contacting the patient's mouth) without requiring complex overall structure.
2Reliability
If small interlocking extensions with sharp edges are used for locking, then the locking mechanism is effective, but sharp edges protrude outwardly causing irritation to the user's mouth
Solution Approach 1:
The smooth coating is applied selectively to the top surface and lateral surfaces that contact the patient's mouth, while the bottom surface (which engages in interlocking) can maintain its geometric features for effective locking. This resolves the contradiction by providing comfort only where needed without compromising locking reliability.
Solution Approach 2:
The patent converts the potentially harmful sharp edges into beneficial features by coating them with a smooth material. The sharp edges provide effective interlocking, while the smooth coating eliminates irritation, effectively converting a harmful characteristic into a beneficial dual-function feature.
3Adaptability or versatility
If multiple separate parts are incorporated to achieve self-ligating function, then orthodontic treatment effectiveness is improved, but the number of failure modes increases
Solution Approach 1:
The patent merges the bracket body and sliding cover into an integrated assembly where the cover is directly attached to the bracket body without separate fastening components. This reduces the number of parts and potential failure points while maintaining the self-ligating functionality, thus improving reliability without sacrificing orthodontic effectiveness.
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 solution enhances patient comfort by eliminating sharp edges and improving the locking mechanism, reducing the need for ligatures, and allowing for greater flexibility and force application along the archwire direction, thereby improving orthodontic treatment efficiency.
Implementation Method 1
A flexible locking tab at the cover's leading edge engages a ridge on the other side of the archwire slot. It flexes up and over a ridge and a spring restoring force locks it in place once it has cleared the ridge.
Implementation Method 2
A flexible locking tab at the cover's leading edge engages a ridge on the other side of the archwire slot. It flexes up and over a ridge
Data Source
AI summary
A self-ligating orthodontic bracket has a sliding archwire cover that has a top surface congruent with the top surface of an upper body portion having an archwire slot. The cover has a resilient locking tab that slides across the slot, bending upward as it encounters a ridge on the other side of the slot, and latching to the ridge to secure the cover in a closed position. The cover has a modified dovetail shape with flared bottom portions that slideably engage guides for reciprocal opening and closing sliding motion. A groove in the slide support track engages the locking tab in the open position preventing it from disengaging from the upper body portion.