Degradation of the mechanical properties of orthodontic NiTi alloys in the oral environment: an in vitro study.
Identifieur interne : 000075 ( Main/Exploration ); précédent : 000074; suivant : 000076Degradation of the mechanical properties of orthodontic NiTi alloys in the oral environment: an in vitro study.
Auteurs : Wiam Rerhrhaye [Maroc] ; Loubna Bahije [Maroc] ; Khalil El Mabrouk [Maroc] ; Fatima Zaoui [Maroc] ; Nadia Marzouk [Maroc]Source :
- International orthodontics [ 1879-680X ] ; 2014.
English descriptors
- KwdEn :
- Acids, Biomechanical Phenomena, Cariostatic Agents (chemistry), Corrosion, Dental Alloys (chemistry), Dental Stress Analysis (instrumentation), Elastic Modulus, Elasticity, Electrochemical Techniques, Fluorides (chemistry), Humans, Hydrogen-Ion Concentration, Materials Testing, Microscopy, Electron, Scanning, Mouth (physiology), Nickel (chemistry), Orthodontic Wires, Spectrophotometry, Atomic, Stainless Steel (chemistry), Stress, Mechanical, Surface Properties, Titanium (chemistry), Traction.
- MESH :
- chemical , chemistry : Cariostatic Agents, Dental Alloys, Fluorides, Nickel, Stainless Steel, Titanium.
- chemical : Acids.
- instrumentation : Dental Stress Analysis.
- physiology : Mouth.
- Biomechanical Phenomena, Corrosion, Elastic Modulus, Elasticity, Electrochemical Techniques, Humans, Hydrogen-Ion Concentration, Materials Testing, Microscopy, Electron, Scanning, Orthodontic Wires, Spectrophotometry, Atomic, Stress, Mechanical, Surface Properties, Traction.
Abstract
Appropriate characterization studies are needed to demonstrate the mechanical and biological effects of interaction between archwires and the oral environment. The aim of this study was to investigate, in vitro, the impact of this acidic and fluoridated environment on the electrochemical behavior and the mechanical properties of orthodontic alloys in nickel titanium and in stainless steel (controls) for the following parameters: Young's modulus (E), elastic limit (σe) and the maximum tensile load (σm). Six samples of each archwire alloy were used to assess these parameters. An Instron universal test apparatus (model - 88512) was used for the traction tests on the wires after immersion in solutions at different concentrations of fluoride and at various pH levels. Observations were made using an electron scanning microscope (ESM) to evaluate the surface and an ICP (inductively coupled plasma) mass spectroscopy analysis was made to quantify the substances released into the immersion solution. For the NiTi archwires, immersion in the fluoridated and acidic medium showed a statistically significant reduction of the Young's modulus (E), the elastic limit (σe) and the maximum tensile load (σm). Similarly, a higher level of released nickel proportionate to the increase in the fluoride concentration and acidity was observed in the immersion solutions. ESM observations revealed the status of the surface of the different alloys and the presence of corrosive pitting.
DOI: 10.1016/j.ortho.2014.06.006
PubMed: 25127751
Affiliations:
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The aim of this study was to investigate, in vitro, the impact of this acidic and fluoridated environment on the electrochemical behavior and the mechanical properties of orthodontic alloys in nickel titanium and in stainless steel (controls) for the following parameters: Young's modulus (E), elastic limit (σe) and the maximum tensile load (σm). Six samples of each archwire alloy were used to assess these parameters. An Instron universal test apparatus (model - 88512) was used for the traction tests on the wires after immersion in solutions at different concentrations of fluoride and at various pH levels. Observations were made using an electron scanning microscope (ESM) to evaluate the surface and an ICP (inductively coupled plasma) mass spectroscopy analysis was made to quantify the substances released into the immersion solution. For the NiTi archwires, immersion in the fluoridated and acidic medium showed a statistically significant reduction of the Young's modulus (E), the elastic limit (σe) and the maximum tensile load (σm). Similarly, a higher level of released nickel proportionate to the increase in the fluoride concentration and acidity was observed in the immersion solutions. ESM observations revealed the status of the surface of the different alloys and the presence of corrosive pitting.</div></front></TEI><affiliations><list><country><li>Maroc</li></country><region><li>Rabat-Salé-Kénitra</li></region><settlement><li>Rabat</li></settlement></list><tree><country name="Maroc"><noRegion><name sortKey="Rerhrhaye, Wiam" sort="Rerhrhaye, Wiam" uniqKey="Rerhrhaye W" first="Wiam" last="Rerhrhaye">Wiam Rerhrhaye</name></noRegion><name sortKey="Bahije, Loubna" sort="Bahije, Loubna" uniqKey="Bahije L" first="Loubna" last="Bahije">Loubna Bahije</name><name sortKey="El Mabrouk, Khalil" sort="El Mabrouk, Khalil" uniqKey="El Mabrouk K" first="Khalil" last="El Mabrouk">Khalil El Mabrouk</name><name sortKey="Marzouk, Nadia" sort="Marzouk, Nadia" uniqKey="Marzouk N" first="Nadia" last="Marzouk">Nadia Marzouk</name><name sortKey="Zaoui, Fatima" sort="Zaoui, Fatima" uniqKey="Zaoui F" first="Fatima" last="Zaoui">Fatima Zaoui</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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