Segmented Orthodontic Arch Wire for 3D Torque Control
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Solution Overview
Problem
Conventional orthodontic arch wire treatments fail to maintain the original three-dimensional shape of the dental arch, leading to inadequate torque application and aesthetic issues due to flat tooth arrangement.
Innovation Solution
A rectangular orthodontic arch wire appliance with a connecting wire of circular cross-section and individual blocks that can be twisted separately to fit along a Monson spherical plate, maintaining the three-dimensional curve without altering the arch wire's shape in plan view, using shape memory alloys for adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If teeth are arranged flatly in an elevational view for aesthetic aspects and torque application, then the arch wire can be twisted to give twisting power, but the original three-dimensional shape of the dental arch cannot be kept
Solution Approach 1:
The arch wire is divided into multiple individual blocks (first block, second block, third block, etc.) that can be independently adjusted. Each block can be twisted separately to apply torque to individual teeth while the overall three-dimensional shape of the dental arch is maintained through the modular structure.
Solution Approach 2:
The individual blocks are designed to be adjustable and movable relative to each other, allowing dynamic modification of the arch wire configuration. This enables the practitioner to twist individual blocks for torque application while preserving the global three-dimensional arch form.
2Force
If the arch wire is twisted to give twisting power, then torque can be applied to the teeth, but the shape of the arch wire in plan view changes
Solution Approach 1:
By segmenting the arch wire into individual blocks, torque can be applied to specific teeth through twisting individual blocks without affecting the overall plan view shape of the arch wire. Each block's rotation is localized and does not propagate to change the global configuration.
Solution Approach 2:
The twisting action is localized to individual blocks rather than the entire arch wire. This allows torque to be applied where needed while other portions of the arch wire maintain their original shape and position in the plan view.
3Force
If individual blocks are used that can be twisted separately, then effective torque application is enabled, but the device complexity increases
Solution Approach 1:
The arch wire is segmented into individual blocks that can be twisted independently for effective torque application. While this increases functional capability, the modular design actually simplifies the overall structure compared to a fully custom-bent arch wire, as each block is a standardized component.
Solution Approach 2:
The individual blocks serve multiple functions: they provide structural support, enable torque application through independent rotation, and can be adjusted to maintain the three-dimensional arch shape. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity.
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
Enables effective torque application and maintains the original three-dimensional shape of the dental arch, ensuring balanced occlusion and reduced interference between blocks, while allowing for adjustable torque and easy bending.
Implementation Method 1
using shape memory alloys for adaptability
Data Source
AI summary
A connecting wire is a wire having a circular cross-section and made of shape memory alloy or the like. Individual blocks have a cross-section configured to engage with an orthodontic bracket and have a through hole to insert the connecting wire. Because a torque is applied separately to each of the individual blocks after the connecting wire and individual blocks are formed according to an arch form on a Monson sphere, the torque can be applied keeping a three-dimensional curve such as the Monson sphere.