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Delayed fracture of beta titanium orthodontic wire in fluoride aqueous solutions

Paper ID Volume ID Publish Year Pages File Format Full-Text
12668 808 2003 8 PDF Available
Title
Delayed fracture of beta titanium orthodontic wire in fluoride aqueous solutions
Abstract

Hydrogen embrittlement of a beta titanium orthodontic wire has been examined by means of a delayed-fracture test in acid and neutral fluoride aqueous solutions and hydrogen thermal desorption analysis. The time to fracture increased with decreasing applied stress in 2.0% and 0.2% acidulated phosphate fluoride (APF) solutions. The fracture mode changed from ductile to brittle when the applied stress was lower than 500 MPa in 2.0% APF solution. On the other hand, the delayed fracture did not occur within 1000 h in neutral NaF solutions, although general corrosion was also observed similar to that in APF solutions. Hydrogen desorption of the delayed-fracture-tested specimens was observed with a peak at approximately 500°C. The amount of absorbed hydrogen was 5000–6500 mass ppm under an applied stress in 2.0% APF solution for 24 h. It is concluded that the immersion in fluoride solutions leads to the degradation of the mechanical properties and fracture of beta titanium alloy associated with hydrogen absorption.

Keywords
Beta titanium; TMA; Orthodontic wire; Delayed fracture; Hydrogen embrittlement; Fluoride
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 24, Issue 12, May 2003, Pages 2113–2120
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
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Full-text PDF Download
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Any Questions? feel free to contact us