Orthodontic Bracket Brazed Archwire Slot Liner
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Solution Overview
Problem
There is a need for a strong bonding system between ceramic orthodontic brackets and archwire slot liners to prevent separation during orthodontic treatment, as metal-to-ceramic contact can lead to reduced torque strength and sliding mechanics, and existing active-metal brazing alloys with fine-grained ceramics compromise torque strength.
Innovation Solution
A silver-copper-titanium (Ag—Cu—Ti) brazing alloy with at least 1.5% by weight titanium is used to secure the archwire slot liner to the ceramic bracket, providing a strong metal-to-ceramic adhesive bond that preserves torque strength and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If metal-to-ceramic contact is used between archwires and brackets, then sliding mechanics are improved, but torque strength is reduced
Solution Approach 1:
A metal liner is introduced as an intermediary component between the ceramic bracket and the archwire. The liner provides a metal surface that enables good sliding mechanics while being bonded to the ceramic bracket, thus resolving the contradiction between sliding performance and torque strength.
Solution Approach 2:
The bracket system becomes a composite structure combining ceramic material (for aesthetic and structural properties) with a metal liner (for sliding mechanics). This composite approach allows each material to contribute its advantageous properties without compromising the other.
2Ease of operation
If archwire slot liners are added to ceramic brackets, then sliding mechanics are improved, but bond strength between liner and bracket becomes critical
Solution Approach 1:
The brazing alloy composition is specifically designed with 1.5-3.0% titanium content, which changes the chemical parameters of the bonding material to achieve optimal adhesion to both ceramic and metal surfaces. This parameter optimization ensures reliable bond strength.
Solution Approach 2:
The brazing process utilizes phase transition of the alloy material from solid to liquid (melting) and back to solid (cooling), allowing the alloy to flow and bond to both surfaces during heating, then solidify and create a strong permanent bond after cooling.
3Reliability
If conventional active-metal brazing alloys are used with fine-grained ceramics, then bonding is achieved, but torque strength is compromised
Solution Approach 1:
The brazing alloy composition is precisely controlled with 1.5-3.0% titanium content, which optimizes the balance between bonding capability and torque strength preservation. This specific compositional parameter range prevents excessive softening of the ceramic-bracket interface while maintaining strong bonding.
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 Ag—Cu—Ti brazing alloy ensures a robust and corrosion-resistant bond between the liner and the bracket, maintaining torque strength and facilitating effective sliding mechanics, even in oral environments.
Implementation Method 1
a metal liner secured within an archwire slot of the bracket with a silver-copper-titanium (Ag—Cu—Ti) brazing alloy
Data Source
AI summary
An orthodontic article and method of making the orthodontic article, where the orthodontic article includes a fine-grain ceramic bracket and a metal liner secured in an archwire slot of the bracket with a brazing alloy comprising silver, copper, and at least about 1.5% by weight titanium.