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ORIGINAL RESEARCH Table of Contents   
Year : 2012  |  Volume : 23  |  Issue : 5  |  Page : 591-595
Influence of fluoride-containing acidic artificial saliva on the mechanical properties of Nickel-Titanium orthodontics wires


1 Department of Stomatology, First Affiliated Hospital, Hangzhou, China
2 Department of Material Chemistry, Zhejiang University, Hangzhou, China
3 Department of Dentistry, Zhejiang Yongjia Hospital, China
4 Institute of Medical Informatics and Statistics, University Hospital Schleswig-Holstein - Campus Kiel, Germany
5 Department of Prosthodontics, Propaedeutics and Dental Materials, Christian-Albrechts University at Kiel, Germany, Now at: Private Practice, 10 Brook Street, W1S 1BG, London, United Kingdom

Correspondence Address:
Christian Mehl
Department of Prosthodontics, Propaedeutics and Dental Materials, Christian-Albrechts University at Kiel, Germany, Now at: Private Practice, 10 Brook Street, W1S 1BG, London, United Kingdom

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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-9290.107332

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Objective: This study aimed to investigate the influence of fluoride and an acidic environment on the mechanical properties of NiTi orthodontic wires (NiTiW) in artificial saliva. Design: A prospective laboratory investigation. Setting: Department of Stomatology, First Affiliated Hospital, Zhejiang University, Hangzhou, China. Materials and Methods: Commercial, round 0.016-inch NiTiW were immersed in 0% or 0.05% Natrium-Fluoride-containing artificial saliva at a pH of 4 or 6 for one or three days, respectively. NiTiW were examined with a three-point bending test, Vickers' microhardness tests and surface morphology observation (SEM). Results: A pH of 4 increased microhardness and decreased the three-point bending strength significantly (P≤0.05), whereas immersion time and fluoride concentration had no significant influence on the microhardness or on the three-point bending strength (P>0.05). When examining the test group NiTiWs after three days of immersion at a pH of 4 the SEM revealed a rough surface morphology, a damaged oxide layer and signs of corrosion. Conclusions: The most influential factor for decreasing the unloading force and increasing the hardness seems to be the pH value, whereas immersion time and NaF addition do not have a major influence.


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