Self-ligating Orthodontic Bracket with Ceramic Composite Door
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Solution Overview
Problem
Aesthetic self-ligating orthodontic brackets face challenges in achieving both aesthetic appeal and functional resilience, as metallic materials are unsuitable due to visibility, while polymeric materials are soft and prone to staining, and ceramic materials are brittle and difficult to machine.
Innovation Solution
The use of a ceramic body with a retention member and a door mechanism that provides discrete, pre-defined open and closed positions for archwire ligation, utilizing a resilient protrusion and clip configuration to securely engage and disengage the archwire, enhancing aesthetics and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic materials are used for the ligation mechanism, then functional resilience is achieved, but aesthetic appeal deteriorates due to visibility
Solution Approach 1:
The patent uses a ceramic material as an intermediary that bridges the gap between metallic resilience and aesthetic appearance. The ceramic body incorporates a metallic ligation mechanism internally while presenting a ceramic exterior that matches tooth color, thus mediating between the conflicting requirements of functional resilience and aesthetic appeal
Solution Approach 2:
The patent employs composite construction by integrating a metallic ligation mechanism within a ceramic matrix. The ceramic body contains the metallic components (clip, spring member, or door mechanism) internally, creating a composite structure that combines the strength and elasticity of metal with the aesthetic properties of ceramic
2Object-affected harmful factors
If polymeric materials are used for the ligation mechanism, then aesthetic appeal is improved, but material strength deteriorates due to softness and staining
Solution Approach 1:
The ceramic material serves as an intermediary that provides the strength and durability normally associated with metal, while the ceramic exterior maintains aesthetic appeal. The ceramic body structurally supports the ligation function without requiring polymeric materials
Solution Approach 2:
The patent eliminates the need for separate disposable ligatures by integrating the ligation function permanently into the bracket body through the ceramic-metric composite structure, removing the recurring need for replacement ligatures that stain and lose elasticity
3Reliability
If ceramic materials are used for the bracket body, then aesthetic appeal and durability are improved, but manufacturing complexity increases due to brittleness and machining difficulty
Solution Approach 1:
The patent divides the bracket into separate functional segments: a ceramic body for aesthetics and durability, and integrated metallic ligation components for function. This segmentation allows each material to be optimized for its specific role and manufactured using appropriate processes
Solution Approach 2:
The composite construction enables the ceramic body to be manufactured separately from the metallic ligation mechanism, which can then be integrated through precision fitting or bonding. This approach circumvents the difficulty of machining complex ligation mechanisms directly into brittle ceramic
4Reliability
If traditional elastomeric ligatures are used, then archwire retention is achieved, but friction increases and hygiene deteriorates due to food and plaque trapping
Solution Approach 1:
The patent extracts and eliminates the separate elastomeric ligature component entirely, integrating the retention function directly into the bracket body through the ceramic-metric composite structure with movable door or clip mechanisms that secure the archwire without requiring external ligatures
Solution Approach 2:
The self-ligating bracket performs the ligation function automatically through its integrated door or clip mechanism that opens and closes to secure the archwire, eliminating the need for separate ligatures that require manual application and removal by the orthodontist
5Reliability
If ligature wire is used for archwire retention, then archwire retention is achieved, but operation time increases due to cumbersome application and removal
Solution Approach 1:
The patent removes the separate ligature wire component and its associated application/removal process, replacing it with an integrated self-ligating mechanism that is permanently attached to the bracket body and operates with a simple door or clip action
Solution Approach 2:
The self-ligating bracket automatically performs the retention function through its built-in door or clip mechanism that can be opened and closed with simple manual action, eliminating the time-consuming process of tying and cutting ligature wires
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 provides a durable, aesthetically pleasing, and functional self-ligating orthodontic bracket that maintains archwire retention without the drawbacks of traditional ligatures, offering improved hygiene and reduced chair time for orthodontic professionals.
Implementation Method 1
utilizing a resilient protrusion and clip configuration to securely engage and disengage the archwire
Data Source
Figure 1~2
Figure 3
Figure 4A
AI summary
Appliances and related methods use a resilient retention member that is retained in a recess within a body that is optionally made from a suitably translucent ceramic material. The retention member, optionally in combination with one or more side walls of the recess, provides two or more regions for accommodating a protrusion. The protrusion, in turn, is part of a sliding door which can be opened or closed depending on the equilibrium position of the protrusion with respect to the two or more regions. Based on the engagement between the protrusion and the retention member, these appliances can provide discrete opened and closed door positions to facilitate archwire ligation.