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dc.creatorRudolf, Rebeka
dc.creatorFercec, Janko
dc.creatorLazić, Vojkan
dc.creatorVeselinović, Valentina
dc.creatorTomić, Sergej
dc.date.accessioned2020-07-02T13:10:11Z
dc.date.available2020-07-02T13:10:11Z
dc.date.issued2017
dc.identifier.issn1680-0737
dc.identifier.urihttp://smile.stomf.bg.ac.rs/handle/123456789/2201
dc.description.abstractThe aim of this paper was to analyse the characteristic properties of different commercially available NiTi archwires (diameter 0.014 ''). Characteristic properties were determined by using DSC analysis for identification of phase temperatures and a tensile test for obtaining the mechanical properties, while semi-quantitative EDS analysis was used for their chemical composition. Analysis of phase temperatures showed that nickel- titanium orthodontic archwires, in the austenitic phase, were exhibiting superelastic effect in the oral environment (T=37 degrees C). The uniaxial stress-strain curves showed different values for the beginning and the end of loading due to the stress and transformation range. The investigation of the chemical composition showed an equiatomic NiTi alloy. The aim of the first phase of biocompatibility assessment of Ni-Ti archwires was to investigate the potential cytotoxicity on a model of rat thymocytes, where a direct contact exists between the archwire and the cells. The test was chosen because of the high sensitivity of thymocytes to proapoptotic stimuli and because the test includes the culture of non-adherent, non-proliferating cells, such as thymocytes, which is much more convenient for the evaluation of a material's cytotoxicity in direct contact, compared to the adherent cells such as fibroblasts. The experiment was designed to cultivate the Ni-Ti archwire samples with rat thymocytes, using different surface-over-volume ratios of the archwires in complete medium. The cytotoxic effect was evaluated by measuring the apoptosis. The aim of the second phase of the study was to investigate further the cytotoxic effects of Ni-Ti archwires in the short-term (24h) and long-term (48h) cultures of rat's thymocytes, which are highly sensitive to pro-apoptotic stimuli, where a direct contact exists between archwires and the cells.en
dc.publisherSpringer-Verlag Singapore Pte Ltd, Singapore
dc.rightsrestrictedAccess
dc.sourceProceedings of the International Conference on Medical & Biological Engineering 2017 (Cmbebih 2017
dc.subjectarchwiresen
dc.subjectShape Memory Effecten
dc.subjectsuper-elasticityen
dc.subjectphase transformationen
dc.subjectthermal analysisen
dc.subjecttensile testen
dc.subjectmicrostructureen
dc.subjectbiocompatibility testingen
dc.titleCharacterisation of NiTi orthodontic archwires characteristic functional propertiesen
dc.typeconferenceObject
dc.rights.licenseARR
dcterms.abstractТомић, Сергеј; Веселиновић, Валентина; Лазић, Војкан; Ферцец, Јанко; Рудолф, Ребека;
dc.citation.volume62
dc.citation.spage323
dc.citation.epage332
dc.citation.other62: 323-332
dc.identifier.wos000462537100049
dc.identifier.doi10.1007/978-981-10-4166-2_49
dc.identifier.scopus2-s2.0-85016076159
dc.identifier.rcubconv_3610
dc.type.versionpublishedVersion


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