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Elemental, microstructural, and mechanical characterization of high gold orthodontic brackets after intraoral aging

Hersche, Sepp ; Sifakakis, Iosif ; Zinelis, Spiros ; Eliades, Theodore

In: Biomedical Engineering / Biomedizinische Technik, 2017, vol. 62, no. 1, p. 97-102

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    Titel
    • Elemental, microstructural, and mechanical characterization of high gold orthodontic brackets after intraoral aging
    Autor
    • Hersche, Sepp. Clinic of Orthodontics and Paediatric Dentistry, Center of Dental Medicine, University of Zurich, Zurich, 8032, Switzerland
    • Sifakakis, Iosif. Department of Orthodontics, School of Dentistry, University of Athens, Athens 11527, Greece
    • Zinelis, Spiros. Clinic of Orthodontics and Paediatric Dentistry, Center of Dental Medicine, University of Zurich, Zurich, 8032, Switzerland
    • Eliades, Theodore. Clinic of Orthodontics and Paediatric Dentistry, Center of Dental Medicine, University of Zurich, Zurich, 8032, Switzerland
    Dokumententyp
    • Postprint
    Sprache
    • Deutsch
    Veröffentlicht in
    • Biomedical Engineering / Biomedizinische Technik, 2017, vol. 62, no. 1, p. 97-102. De Gruyter
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:332967
    Summary
    The purpose of the present study was to investigate the elemental composition, the microstructure, and the selected mechanical properties of high gold orthodontic brackets after intraoral aging. Thirty Incognito™ (3M Unitek, Bad Essen, Germany) lingual brackets were studied, 15 brackets as received (control group) and 15 brackets retrieved from different patients after orthodontic treatment. The surface of the wing area was examined by scanning electron microscopy (SEM). Backscattered electron imaging (BEI) was performed, and the elemental composition was determined by X-ray EDS analysis (EDX). After appropriate metallographic preparation, the mechanical properties tested were Martens hardness (HM), indentation modulus (EIT), elastic index (ηIT), and Vickers hardness (HV). These properties were determined employing instrumented indentation testing (IIT) with a Vickers indenter. The results were statistically analyzed by unpaired t-test (α=0.05). There were no statistically significant differences evidenced in surface morphology and elemental content between the control and the experimental group. These two groups of brackets showed no statistically significant difference in surface morphology. Moreover, the mean values of HM, EIT, ηIT, and HV did not reach statistical significance between the groups (p>0.05). Under the limitations of this study, it may be concluded that the surface elemental content and microstructure as well as the evaluated mechanical properties of the Incognito™ lingual brackets remain unaffected by intraoral aging.