Orthodontic Indirect Bonding Tray Stabilization
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Solution Overview
Problem
Current indirect bonding techniques for orthodontic appliances face challenges with improper fit and instability of the transfer tray, leading to potential malpositioning of appliances during orthodontic treatment, especially when the tray is placed over a small number of teeth, due to inaccuracies in fabrication and insufficient rigidity of materials.
Innovation Solution
An orthodontic indirect bonding tray with a combination of a rigid outer shell and a flexible inner matrix, along with a stabilization member that extends to an adjacent tooth, providing enhanced stability and visual confirmation of correct placement, thereby minimizing 'wiggle' and ensuring precise alignment of appliances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional indirect bonding tray is used, then the bonding process can be performed, but the tray exhibits instability and improper fit leading to malpositioning of appliances
Solution Approach 1:
The tray is divided into two distinct components: a rigid outer shell that maintains structural integrity and a flexible inner matrix that adapts to tooth surfaces. This segmentation allows each component to fulfill its specific function - the rigid shell provides stability while the flexible matrix ensures proper fit, thereby resolving the contradiction between tray stability and placement accuracy.
Solution Approach 2:
The tray utilizes composite construction combining rigid and flexible materials in a single integrated structure. The outer shell is made from rigid material for structural support, while the inner matrix uses flexible material for adaptation. This composite approach enables the tray to simultaneously achieve both stability and accuracy, eliminating the malpositioning issues associated with traditional single-material trays.
2Adaptability or versatility
If the tray is placed over a small number of teeth, then the procedure can be performed, but fabrication inaccuracies and insufficient rigidity cause improper fit
Solution Approach 1:
The inner matrix is designed with localized flexibility that allows it to conform to the specific geometry of the teeth it contacts. This local adaptation capability ensures that even when the tray is placed over a small number of teeth, the flexible matrix can accurately adapt to those specific surfaces, compensating for any fabrication variations and ensuring precise fit and proper appliance positioning.
Data Source
AI summary
A tray for use in bonding orthodontic appliances to selected teeth of a patient is disclosed. The tray includes an outer shell having wall sections extending over facial, lingual, and occlusal surfaces of the selected teeth to form a channel including tooth cavities having a configuration matching and arranged for receiving the selected teeth. A matrix is bonded to the inner surface of the outer shell and is contoured to complement the facial or lingual surface of the teeth. A stabilization member extends from the outer shell and includes an inside surface contoured to complement at least a portion of the facial surface of a tooth located adjacent the selected teeth. Orthodontic appliances are detachably connected to the matrix, wherein each appliance includes a base for bonding the appliance to a tooth.