Self-ligating Bracket with Ceramic Cover and Metal Clip
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Solution Overview
Problem
Conventional orthodontic appliances face challenges in achieving an aesthetic and functional self-ligating bracket that is easy to use and manufacture, with materials like metals being non-aesthetic and polymers being soft and prone to staining, while ceramic materials are brittle and difficult to machine.
Innovation Solution
A self-ligating orthodontic appliance featuring a ceramic ligating cover coupled to a resilient clip pivotable about a hinge mechanism, providing active ligation with a continuous force to the archwire, and an air gap for elastic deformation, allowing easy operation and preventing inadvertent opening during treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal materials are used for the ligation mechanism, then strength and elasticity are improved, but aesthetics deteriorate
Solution Approach 1:
The ligation mechanism is divided into two separate components: a ceramic ligating cover for aesthetics and a metal resilient clip for mechanical function. This segmentation allows each material to be optimized for its specific role without compromising the other.
Solution Approach 2:
The invention uses a composite structure combining ceramic material for the ligating cover and metal material for the resilient clip. This composite approach allows the system to simultaneously achieve the aesthetic properties of ceramic and the mechanical properties of metal.
2Ease of manufacture
If polymer materials are used for the ligation mechanism, then aesthetics are improved, but mechanical strength and resistance to wear deteriorate
Solution Approach 1:
The ligation mechanism is divided into two separate components: a ceramic ligating cover for aesthetics and a metal resilient clip for mechanical function. This segmentation allows each material to be optimized for its specific role without compromising the other.
Solution Approach 2:
The invention uses a composite structure combining ceramic material for the ligating cover and metal material for the resilient clip. This composite approach allows the system to simultaneously achieve the aesthetic properties of ceramic and the mechanical properties of metal.
3Ease of manufacture
If ceramic materials are used for the ligation mechanism, then aesthetics and resistance to staining are improved, but brittleness increases and ease of manufacture deteriorates
Solution Approach 1:
The ligation mechanism is divided into two separate components: a ceramic ligating cover for aesthetics and a metal resilient clip for mechanical function. This segmentation allows each material to be optimized for its specific role without compromising the other.
Solution Approach 2:
The invention uses a composite structure combining ceramic material for the ligating cover and metal material for the resilient clip. This composite approach allows the system to simultaneously achieve the aesthetic properties of ceramic and the mechanical properties of metal.
4Ease of operation
If active ligation is implemented, then control over tooth movement is improved, but friction increases
Solution Approach 1:
The resilient clip provides localized active ligation force at specific contact points with the archwire, allowing control where needed while maintaining low friction in other areas. The clip can be positioned to engage the archwire in a way that provides torque control without excessive frictional resistance.
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 appliance offers superior aesthetics and control over tooth movement with active ligation, reducing friction and improving torque transmission, while being easier to manufacture and maintain than conventional systems.
Implementation Method 1
a resilient clip coupled to both of the ligating cover and the hinge, wherein the door assembly is pivotable along the hinge axis between an open position allowing access to the archwire slot and a closed position obstructing access to the archwire slot
Implementation Method 2
an air gap for elastic deformation, allowing easy operation and preventing inadvertent opening during treatment
Data Source
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AI summary
An aesthetic ceramic material is combined with a resilient metal to obtain an aesthetic self-ligating appliance with an easily operable latch mechanism. The appliance uses a door assembly that includes a ceramic ligating cover coupled to a resilient clip pivotable about a hinge mechanism. The clip functions as a latch to reversibly secure the clip and ligating cover to the appliance and retain an archwire in an archwire slot, and is capable of providing active ligation whereby the clip elastically deflects while directly or indirectly providing a continuous force to the archwire. Advantageously, the clip has a configuration that allows an orthodontic practitioner to pivot open the door assembly with minimal force while preventing the inadvertent opening of the door assembly as a result of normal forces applied by the archwire against the door assembly during the course of treatment.