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Ion release from NiTi orthodontic wires in artificial saliva with various acidities

Paper ID Volume ID Publish Year Pages File Format Full-Text
12530 795 2003 8 PDF Available
Title
Ion release from NiTi orthodontic wires in artificial saliva with various acidities
Abstract

NiTi orthodontic wire products from different manufacturers would have different corrosion resistance. We assayed the corrosion resistance, in terms of ion release, of different NiTi orthodontic wires in artificial saliva with various acidities. Four types of as-received commercial NiTi orthodontic wires were immersed in artificial saliva (37°C) at pH 2.5–6.25 for different periods (1–28 d). The amount of Ni and Ti ions released from NiTi wires was determined using an atomic adsorption spectrophotometer. Surface morphology and roughness of wires were related to the corrosion resistance. Results showed that the manufacturer, pH value, and immersion period, respectively, had a significantly statistical influence on the release amount of Ni and Ti ions. The amount of Ni ions released in all test solutions was well below the critical value necessary to induce allergy and below daily dietary intake level. The amount of Ti ions released in pH⩾3.75 solution was mostly not detectable, representing that the TiO2 film on NiTi wires exhibited a good protection against corrosion. Pre-existed surface defects on NiTi wires might be the preferred locations for corrosion. The NiTi wire with the highest release amount of metal ions had the maximal increase in surface roughness after immersion test, while a rougher surface did not correspond to a higher metal ion release.

Keywords
Ion release; NiTi; Orthodontic wire; Ni; Ti; pH
First Page Preview
Ion release from NiTi orthodontic wires in artificial saliva with various acidities
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 24, Issue 20, September 2003, Pages 3585–3592
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering