Self-Ligating Orthodontic Bracket With Sliding Retainer
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Solution Overview
Problem
Conventional self-ligating orthodontic bracket assemblies face challenges in easily manipulating archwires, achieving uniform resin distribution for secure attachment to teeth, and safely removing the brackets without damaging the tooth surface.
Innovation Solution
A self-ligating orthodontic bracket assembly with a body block featuring a curved base, guide walls, a stopper wall, a ligating block, and a retainer system that includes temporary and complete assembly protrusions, allowing for easy ligation and release of the archwire, and a double step structure with varying adhesion protrusions for uniform resin distribution and reduced compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a self-ligating orthodontic bracket assembly is used to cover the archwire from the top for aesthetic satisfaction, then the archwire is not easily observed from the outside, but it becomes difficult to easily manipulate the archwire when position change, tensile force adjustment, or other handling is required
Solution Approach 1:
The ligating block is designed to slide along the guide walls between a ligation position and a release position. This dynamic movement allows the retainer to transition from constraining the archwire (ligation) to allowing free manipulation (release), resolving the contradiction between aesthetic coverage and ease of operation
Solution Approach 2:
The bracket assembly is divided into separate functional components: a body block for tooth attachment, guide walls for directing movement, and a movable ligating block with retainer. This segmentation allows the ligating function to be independently controlled while maintaining aesthetic coverage, enabling easy manipulation when needed
2Reliability
If an orthodontic bracket assembly is securely attached to the tooth surface with strong adhesion, then reliable attachment is achieved, but it becomes difficult to separate from the tooth surface without damage after treatment completion
Solution Approach 1:
The base is designed with a double step structure featuring a first recessed portion and a second recessed portion at different depths. This creates zones of different resin compression: the first recessed portion allows excessive resin to flow out (reducing compression), while the second recessed portion maintains adequate resin thickness for secure adhesion. This local differentiation enables both reliable attachment and easier removal
3Strength
If resin is compressed uniformly across the base to ensure secure attachment, then adhesion strength is maximized, but the tooth surface may be damaged during separation
Solution Approach 1:
The base incorporates a double step structure with recessed portions at different depths to create localized zones of different resin compression. The first recessed portion (deeper) allows resin to flow out and reduces compression in that area, while the second recessed portion (shallower) maintains adequate compression for adhesion. This prevents excessive compression that could damage the tooth surface during removal
4Reliability
If excessive resin is interposed between the base and tooth surface to ensure complete coverage, then attachment reliability is improved, but resin compression becomes non-uniform and removal becomes difficult
Solution Approach 1:
The base design includes recessed portions that actively remove (take out) excessive resin from the interface between the base and tooth surface. The first recessed portion allows resin to flow out during attachment, preventing accumulation and non-uniform compression. This extraction of excess resin ensures uniform distribution while maintaining adequate coverage for reliable attachment
Data Source
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AI summary
Disclosed herein is a self-ligating orthodontic bracket assembly. The self-ligating orthodontic bracket assembly includes: a body block including a base, a pair of guide walls, and a stopper wall in an integrated manner; a ligating block configured to be slidably coupled to the sliding portion so that the archwire slidably inserted and seated into the seating groove is selectively ligated and released in a seated state, and provided with a fitting depression formed by recessing the bottom of the ligating block upward and a guide depression formed through upward recessing to form a step at a location away from one end of the fitting depression; and a ligating means including a temporary assembly protrusion and a complete assembly protrusion successively formed on the sliding portion, and a retainer configured to selectively ligate and release the archwire in cooperation with the temporary assembly protrusion and the complete assembly protrusion.