Physicochemical Research of Clinically Retrieved CU-NI-TI Orthodontic Archwires

In modern orthodontics, thermally activated archwires are used more widely in clinical practice, because they have unique properties like superelasticity and bio-compatibility. The aim of the present study was to characterize commercial 35° C Cu-NiTi archwires in terms of their phase transition beha...

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Autores principales:	Stoyanova-Ivanova A., Petrov V., Petrova V., Andreeva L., Ilievska I., Zaleski A., Mikli V.
Formato:	article
Lenguaje:	EN
Publicado:	Sciendo 2021
Materias:	35 °c thermo-active copper niti (cuniti) autoclaving process dsc xrd sem edx Medicine R
Acceso en línea:	https://doaj.org/article/72aab89f5e8948ea8b179d154f6bcf84
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spelling	oai:doaj.org-article:72aab89f5e8948ea8b179d154f6bcf842021-12-02T14:59:51ZPhysicochemical Research of Clinically Retrieved CU-NI-TI Orthodontic Archwires0324-175010.2478/amb-2021-0011https://doaj.org/article/72aab89f5e8948ea8b179d154f6bcf842021-04-01T00:00:00Zhttps://doi.org/10.2478/amb-2021-0011https://doaj.org/toc/0324-1750In modern orthodontics, thermally activated archwires are used more widely in clinical practice, because they have unique properties like superelasticity and bio-compatibility. The aim of the present study was to characterize commercial 35° C Cu-NiTi archwires in terms of their phase transition behavior, chemical composition, surface topography properties after clinical usage, as well as the influence of the autoclaving process. Materials and methods. 35° C Thermo-Active Copper NiTi (CuNiTi) of ORMCO, Glendora, CA, USA (as-received, as-received autoclaved and clinically retrieved) with rectangular cross-section and dimension 0.016x0.022 inch, were investigated. The physicochemical research was conducted via Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDX) and X-ray Diffraction Analysis (XRD). The autoclaving was done in Runyes model B autoclave. Results. The DSC results revealed the austenite start (9.8° C; 26.47° C) and austenite finish (28° C; 31.74° C) temperatures for the as-received and autoclaved archwires respectively. For clinically retrieved samples the austenite finish temperature (Af) is around 27° C. The XRD patterns of the as-received and clinically retrieved samples show almost identical diffraction patterns. Rough surface of the CuNiTi alloy was revealed by the SEM analysis. Autoclaving process seems to have no effects on archwires’ structure and chemical composition. Chemical content of the investigated as-received CuNiTi are Ni, Ti and Cu: 47.07 wt% and 46.81 wt% and 6.11 wt%, respectively. The autoclaving process seems to have little influence on the transition temperature. The results from our study showed little difference (~7 °C) in the finish transition temperatures (Af), compared to the manufacturer’s claim. No intermediate R phase was detected by DSC. Conclusion. A good knowledge of the structural changes that occur in CuNiTi alloys in the oral cavity is useful for the orthodontists in order to optimize orthodontic treatment.Stoyanova-Ivanova A.Petrov V.Petrova V.Andreeva L.Ilievska I.Zaleski A.Mikli V.Sciendoarticle35 °c thermo-active copper niti (cuniti)autoclaving processdscxrdsemedxMedicineRENActa Medica Bulgarica, Vol 48, Iss 1, Pp 68-74 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	35 °c thermo-active copper niti (cuniti) autoclaving process dsc xrd sem edx Medicine R
spellingShingle	35 °c thermo-active copper niti (cuniti) autoclaving process dsc xrd sem edx Medicine R Stoyanova-Ivanova A. Petrov V. Petrova V. Andreeva L. Ilievska I. Zaleski A. Mikli V. Physicochemical Research of Clinically Retrieved CU-NI-TI Orthodontic Archwires
description	In modern orthodontics, thermally activated archwires are used more widely in clinical practice, because they have unique properties like superelasticity and bio-compatibility. The aim of the present study was to characterize commercial 35° C Cu-NiTi archwires in terms of their phase transition behavior, chemical composition, surface topography properties after clinical usage, as well as the influence of the autoclaving process. Materials and methods. 35° C Thermo-Active Copper NiTi (CuNiTi) of ORMCO, Glendora, CA, USA (as-received, as-received autoclaved and clinically retrieved) with rectangular cross-section and dimension 0.016x0.022 inch, were investigated. The physicochemical research was conducted via Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDX) and X-ray Diffraction Analysis (XRD). The autoclaving was done in Runyes model B autoclave. Results. The DSC results revealed the austenite start (9.8° C; 26.47° C) and austenite finish (28° C; 31.74° C) temperatures for the as-received and autoclaved archwires respectively. For clinically retrieved samples the austenite finish temperature (Af) is around 27° C. The XRD patterns of the as-received and clinically retrieved samples show almost identical diffraction patterns. Rough surface of the CuNiTi alloy was revealed by the SEM analysis. Autoclaving process seems to have no effects on archwires’ structure and chemical composition. Chemical content of the investigated as-received CuNiTi are Ni, Ti and Cu: 47.07 wt% and 46.81 wt% and 6.11 wt%, respectively. The autoclaving process seems to have little influence on the transition temperature. The results from our study showed little difference (~7 °C) in the finish transition temperatures (Af), compared to the manufacturer’s claim. No intermediate R phase was detected by DSC. Conclusion. A good knowledge of the structural changes that occur in CuNiTi alloys in the oral cavity is useful for the orthodontists in order to optimize orthodontic treatment.
format	article
author	Stoyanova-Ivanova A. Petrov V. Petrova V. Andreeva L. Ilievska I. Zaleski A. Mikli V.
author_facet	Stoyanova-Ivanova A. Petrov V. Petrova V. Andreeva L. Ilievska I. Zaleski A. Mikli V.
author_sort	Stoyanova-Ivanova A.
title	Physicochemical Research of Clinically Retrieved CU-NI-TI Orthodontic Archwires
title_short	Physicochemical Research of Clinically Retrieved CU-NI-TI Orthodontic Archwires
title_full	Physicochemical Research of Clinically Retrieved CU-NI-TI Orthodontic Archwires
title_fullStr	Physicochemical Research of Clinically Retrieved CU-NI-TI Orthodontic Archwires
title_full_unstemmed	Physicochemical Research of Clinically Retrieved CU-NI-TI Orthodontic Archwires
title_sort	physicochemical research of clinically retrieved cu-ni-ti orthodontic archwires
publisher	Sciendo
publishDate	2021
url	https://doaj.org/article/72aab89f5e8948ea8b179d154f6bcf84
work_keys_str_mv	AT stoyanovaivanovaa physicochemicalresearchofclinicallyretrievedcunitiorthodonticarchwires AT petrovv physicochemicalresearchofclinicallyretrievedcunitiorthodonticarchwires AT petrovav physicochemicalresearchofclinicallyretrievedcunitiorthodonticarchwires AT andreeval physicochemicalresearchofclinicallyretrievedcunitiorthodonticarchwires AT ilievskai physicochemicalresearchofclinicallyretrievedcunitiorthodonticarchwires AT zaleskia physicochemicalresearchofclinicallyretrievedcunitiorthodonticarchwires AT mikliv physicochemicalresearchofclinicallyretrievedcunitiorthodonticarchwires
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Physicochemical Research of Clinically Retrieved CU-NI-TI Orthodontic Archwires

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