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Degradation and fracture of Ni–Ti superelastic wire in an oral cavity

Paper ID Volume ID Publish Year Pages File Format Full-Text
13837 915 2001 6 PDF Available
Title
Degradation and fracture of Ni–Ti superelastic wire in an oral cavity
Abstract

Superelastic Ni–Ti wire is widely used in orthodontic clinics, but delayed fracture in the oral cavity has been observed. Because hydrogen embrittlement is known to cause damage to Ti alloy systems, orthodontic wires were charged with hydrogen using an electro-chemical system in saline. Tensile tests were carried out, and fracture surfaces were observed after hydrogen charging. The strength of the Co–Cr alloy and stainless steel used in orthodontic treatment, was not affected by the hydrogen charging. However, Ni–Ti wire showed significant decreases in strength. The critical stress of martensite transformation was increased with increasing hydrogen charging, and the alloy was embrittled. The fractured surface of the alloys with severe hydrogen charging exhibited dimple patterns similar to those in the alloys from patients. In view of the galvanic current in the mouth, the fracture of the Ni–Ti alloys might be attributed to the degradation of the mechanical properties due to hydrogen absorption.

Keywords
Hydrogen; Ni–Ti alloy; Superelasticity; Orthodontic wire; Tensile strength
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Degradation and fracture of Ni–Ti superelastic wire in an oral cavity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 22, Issue 16, 15 August 2001, Pages 2257–2262
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
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us