Orthodontic Bracket Blocking Member for Archwire Retention
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Solution Overview
Problem
Conventional orthodontic brackets face issues with archwire retention, particularly when subjected to unexpected external forces, leading to uneven tooth movement and potential archwire deformation, due to the limitations of existing locking mechanisms which struggle to balance wire size compatibility and rotational control.
Innovation Solution
The orthodontic bracket incorporates a blocking member on the gingival tie wings, which extends beyond the archwire slot to prevent movement into the retaining groove, providing increased contact area and torque, and is designed to be retrofitted onto existing brackets, enhancing archwire retention and rotational control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking shutter with retaining groove is used to retain the archwire, then archwire retention is improved, but the archwire can slip into the retaining groove and become caught when unexpected large external force is applied
Solution Approach 1:
The bracket is divided into functional zones: the archwire slot for normal wire placement, the retaining groove for secure retention via locking shutter, and the blocking member that segments the path to prevent wire slippage into the groove. This segmentation allows each zone to perform its specific function without interference.
Solution Approach 2:
The blocking member acts as an intermediary element between the archwire slot and the retaining groove. It mediates the potential harmful interaction by physically blocking the wire from entering the groove unintentionally, while still allowing the locking shutter to function properly.
2Manufacturing precision
If the locking shutter is made smaller to improve rotational control, then rotational control is improved, but the locking shutter has insufficient length for holding the archwire
Solution Approach 1:
The solution moves from solely relying on the locking shutter's length in one dimension to utilizing the blocking member's position in another dimension (transversely across the retaining groove). This dimensional shift allows rotational control to be achieved without compromising the locking shutter's functional length.
3Reliability
If ligature wire is used to hold the archwire, then archwire retention is improved, but much chair time is required to remove and adjust the ligature wire
Solution Approach 1:
The locking shutter provides a dynamic retention mechanism that can be quickly opened and closed without requiring time-consuming adjustments. Unlike ligature wires that need to be tied and untied, the locking shutter can be rapidly engaged and disengaged, significantly reducing chair time while maintaining secure retention.
4Strength
If a thicker wire is used to improve rigidity, then archwire rigidity is improved, but the wire size compatibility of the locking mechanism is compromised
Solution Approach 1:
The blocking member is designed with dimensions and positioning that provide universal compatibility across different wire sizes. By placing the block strategically, it effectively blocks the retaining groove for various wire diameters while still allowing the locking shutter to engage properly, making the mechanism versatile for different wire specifications.
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
This solution effectively prevents archwire slippage and deformation, ensuring stable retention and improved tooth movement by increasing the torque and rotational control, reducing wear and the risk of notching, and allowing for more effective orthodontic treatment with less archwire tension.
Implementation Method 1
A locking shutter including at least one resilient arm member at one end and a retaining portion at another end
Implementation Method 2
providing increased contact area and torque
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
An orthodontic bracket for attaching an archwire to a tooth including a body including a bonding base for attachment to the tooth, the body having an occlusal-gingivally extending opening, a lingual vertical slot, a pair of laterally spaced gingival tie wings and a pair of laterally spaced occlusal tie wings, the gingival and occlusal tie wings projecting from a labial surface of the body. An archwire slot is provided extending mesiodistally across the body and between the gingival and occlusal tie wings at opposed medial and distal sides of the body to accommodate the archwire. A locking shutter including at least one resilient arm member at one end and a retaining portion at another end is provided such that the locking shutter moveable between an open position in which placement and removal of the archwire is facilitated and a closed position in which placement and removal of the archwire is inhibited. There is further provided a retaining groove formed in an occlusal wall of the gingival tie wings for releasably retaining a retaining portion of the locking shutter in the closed position and, at least one blocker for preventing movement of the archwire out of the archwire slot and into the retaining groove. In addition, a broader locking shutter is possible that prevents a sharp bend in the archwire to prevent notching or bonding of the archwire during early tooth movement and sliding of teeth during mid-term treatment tooth movement.