TY  - CONF
AU  - Rudolf, Rebeka
AU  - Fercec, Janko
AU  - Lazić, Vojkan
AU  - Veselinović, Valentina
AU  - Tomić, Sergej
PY  - 2017
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/2201
AB  - The 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.
PB  - Springer-Verlag Singapore Pte Ltd, Singapore
C3  - Proceedings of the International Conference on Medical & Biological Engineering 2017 (Cmbebih 2017
T1  - Characterisation of NiTi orthodontic archwires characteristic functional properties
VL  - 62
SP  - 323
EP  - 332
DO  - 10.1007/978-981-10-4166-2_49
ER  - 

@conference{
author = "Rudolf, Rebeka and Fercec, Janko and Lazić, Vojkan and Veselinović, Valentina and Tomić, Sergej",
year = "2017",
abstract = "The 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.",
publisher = "Springer-Verlag Singapore Pte Ltd, Singapore",
journal = "Proceedings of the International Conference on Medical & Biological Engineering 2017 (Cmbebih 2017",
title = "Characterisation of NiTi orthodontic archwires characteristic functional properties",
volume = "62",
pages = "323-332",
doi = "10.1007/978-981-10-4166-2_49"
}

Rudolf, R., Fercec, J., Lazić, V., Veselinović, V.,& Tomić, S.. (2017). Characterisation of NiTi orthodontic archwires characteristic functional properties. in Proceedings of the International Conference on Medical & Biological Engineering 2017 (Cmbebih 2017
Springer-Verlag Singapore Pte Ltd, Singapore., 62, 323-332.
https://doi.org/10.1007/978-981-10-4166-2_49

Rudolf R, Fercec J, Lazić V, Veselinović V, Tomić S. Characterisation of NiTi orthodontic archwires characteristic functional properties. in Proceedings of the International Conference on Medical & Biological Engineering 2017 (Cmbebih 2017. 2017;62:323-332.
doi:10.1007/978-981-10-4166-2_49 .

Rudolf, Rebeka, Fercec, Janko, Lazić, Vojkan, Veselinović, Valentina, Tomić, Sergej, "Characterisation of NiTi orthodontic archwires characteristic functional properties" in Proceedings of the International Conference on Medical & Biological Engineering 2017 (Cmbebih 2017, 62 (2017):323-332,
https://doi.org/10.1007/978-981-10-4166-2_49 . .

TY  - JOUR
AU  - Marković, Evgenija
AU  - Fercec, Janko
AU  - Šćepan, Ivana
AU  - Glišić, Branislav
AU  - Nedeljković, Nenad
AU  - Juloski, Jovana
AU  - Rudolf, Rebeka
PY  - 2015
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/2037
AB  - Introduction Forces generated in orthodontic treatment with fixed appliances create tension and compression zones in the periodontal ligament resulting in a painful experience for patients. In the first phase of orthodontic treatment, when leveling of teeth is needed, nickel-titanium (NiTi) archwires can be completely engaged in brackets, even in the cases of extreme crowding, exerting small forces. There is a great individual variation in the pain perception related to the application of orthodontic forces. Objective The aim of this study was to investigate the pain perception among patients with dental crowding after insertion of six different NiTi orthodontic archwires as a part of fixed appliances in the first stage of orthodontic treatment. Methods The study was conducted on a sample of 189 orthodontic patients receiving one of six different either superelastic or heat activated NiTi archwires, in the first phase of orthodontic treatment. Pain perception was evaluated in groups of patients with different degree of crowding. The modified McGill Pain Questionnaire with Visual Analogue Scale was used to evaluate the quality and intensity of pain. Statistical analysis was performed using simple descriptive statistics, and Pearson's chi-square test with statistical significance of p lt 0.05. Results Majority of patients reported pain as discomfort or pressure of moderate intensity caused by chewing or biting, started within 12 hours, carried on for 3-4 days, and decreased over time without self-medication. Conclusion No correlation was found between pain perception among patients with different types of NiTi archwires and the degree of crowding.
AB  - Uvod Ortodontske sile kojima se tokom terapije fiksnim aparatima pomeraju zubi dovode do istezanja i kompresije parodontalnih vlakana, te pojave bola kod pacijenata. U prvoj fazi ortodontskog lečenja, kada se zubi nivelišu, žice od legure nikl-titanijuma proizvode relativno malu silu i mogu se potpuno ligirati u slotove bravica, čak i u slučajevima velike teskobe. Postoje veoma velike individualne varijacije u percepciji bola prilikom primene ortodontskih sila. Cilj rada Cilj istraživanja je bio da se ispita percepcija bola kod osoba s teskobom u zubnim nizovima nakon ligiranja šest različitih ortodontskih žica u sklopu prve faze terapije fiksnim aparatima. Metode rada Studija je urađena na uzorku od 189 pacijenata kojima je u okviru ortodontskog lečenja fiksnim aparatima bila ligirana jedna od šest različitih superelastičnih ili termo žica od legure nikl-titanijuma. Percepcija bola je procenjivana kod osoba s različitom izraženošću teskobe. Korišćen je modifikovani Makgilov (McGill) upitnik za bol s Vizuelnom analognom skalom radi opisivanja kvaliteta i intenziteta bola. Statistička obrada podataka je obuhvatila deskriptivnu statističku analizu i primenu h2-testa sa statističkom značajnošću od p lt 0,05. Rezultati Najveći broj ispitanika je opisao bol kao neprijatnost ili pritisak srednjeg intenziteta izazvan žvakanjem ili dodirom, koji je počinjao do 12 sati od ligiranja žice, trajao je tri-četiri dana i smanjivao se bez primene lekova. Zaključak Nije utvrđena statistički značajna razlika u percepciji bola kod osoba s različitom izraženošću teskobe zubnih nizova kojima su bile ligirane superelastične i termo žice od legure nikl-titanijuma.
PB  - Srpsko lekarsko društvo, Beograd
T2  - Srpski arhiv za celokupno lekarstvo
T1  - The correlation between pain perception among patients with six different orthodontic archwires and the degree of dental crowding
T1  - Zavisnost između percepcije bola kod pacijenata sa šest različitih ortodontskih žica i teskobe zubnih nizova
VL  - 143
IS  - 3-4
SP  - 134
EP  - 140
DO  - 10.2298/SARH1504134M
ER  - 

@article{
author = "Marković, Evgenija and Fercec, Janko and Šćepan, Ivana and Glišić, Branislav and Nedeljković, Nenad and Juloski, Jovana and Rudolf, Rebeka",
year = "2015",
abstract = "Introduction Forces generated in orthodontic treatment with fixed appliances create tension and compression zones in the periodontal ligament resulting in a painful experience for patients. In the first phase of orthodontic treatment, when leveling of teeth is needed, nickel-titanium (NiTi) archwires can be completely engaged in brackets, even in the cases of extreme crowding, exerting small forces. There is a great individual variation in the pain perception related to the application of orthodontic forces. Objective The aim of this study was to investigate the pain perception among patients with dental crowding after insertion of six different NiTi orthodontic archwires as a part of fixed appliances in the first stage of orthodontic treatment. Methods The study was conducted on a sample of 189 orthodontic patients receiving one of six different either superelastic or heat activated NiTi archwires, in the first phase of orthodontic treatment. Pain perception was evaluated in groups of patients with different degree of crowding. The modified McGill Pain Questionnaire with Visual Analogue Scale was used to evaluate the quality and intensity of pain. Statistical analysis was performed using simple descriptive statistics, and Pearson's chi-square test with statistical significance of p lt 0.05. Results Majority of patients reported pain as discomfort or pressure of moderate intensity caused by chewing or biting, started within 12 hours, carried on for 3-4 days, and decreased over time without self-medication. Conclusion No correlation was found between pain perception among patients with different types of NiTi archwires and the degree of crowding., Uvod Ortodontske sile kojima se tokom terapije fiksnim aparatima pomeraju zubi dovode do istezanja i kompresije parodontalnih vlakana, te pojave bola kod pacijenata. U prvoj fazi ortodontskog lečenja, kada se zubi nivelišu, žice od legure nikl-titanijuma proizvode relativno malu silu i mogu se potpuno ligirati u slotove bravica, čak i u slučajevima velike teskobe. Postoje veoma velike individualne varijacije u percepciji bola prilikom primene ortodontskih sila. Cilj rada Cilj istraživanja je bio da se ispita percepcija bola kod osoba s teskobom u zubnim nizovima nakon ligiranja šest različitih ortodontskih žica u sklopu prve faze terapije fiksnim aparatima. Metode rada Studija je urađena na uzorku od 189 pacijenata kojima je u okviru ortodontskog lečenja fiksnim aparatima bila ligirana jedna od šest različitih superelastičnih ili termo žica od legure nikl-titanijuma. Percepcija bola je procenjivana kod osoba s različitom izraženošću teskobe. Korišćen je modifikovani Makgilov (McGill) upitnik za bol s Vizuelnom analognom skalom radi opisivanja kvaliteta i intenziteta bola. Statistička obrada podataka je obuhvatila deskriptivnu statističku analizu i primenu h2-testa sa statističkom značajnošću od p lt 0,05. Rezultati Najveći broj ispitanika je opisao bol kao neprijatnost ili pritisak srednjeg intenziteta izazvan žvakanjem ili dodirom, koji je počinjao do 12 sati od ligiranja žice, trajao je tri-četiri dana i smanjivao se bez primene lekova. Zaključak Nije utvrđena statistički značajna razlika u percepciji bola kod osoba s različitom izraženošću teskobe zubnih nizova kojima su bile ligirane superelastične i termo žice od legure nikl-titanijuma.",
publisher = "Srpsko lekarsko društvo, Beograd",
journal = "Srpski arhiv za celokupno lekarstvo",
title = "The correlation between pain perception among patients with six different orthodontic archwires and the degree of dental crowding, Zavisnost između percepcije bola kod pacijenata sa šest različitih ortodontskih žica i teskobe zubnih nizova",
volume = "143",
number = "3-4",
pages = "134-140",
doi = "10.2298/SARH1504134M"
}

Marković, E., Fercec, J., Šćepan, I., Glišić, B., Nedeljković, N., Juloski, J.,& Rudolf, R.. (2015). The correlation between pain perception among patients with six different orthodontic archwires and the degree of dental crowding. in Srpski arhiv za celokupno lekarstvo
Srpsko lekarsko društvo, Beograd., 143(3-4), 134-140.
https://doi.org/10.2298/SARH1504134M

Marković E, Fercec J, Šćepan I, Glišić B, Nedeljković N, Juloski J, Rudolf R. The correlation between pain perception among patients with six different orthodontic archwires and the degree of dental crowding. in Srpski arhiv za celokupno lekarstvo. 2015;143(3-4):134-140.
doi:10.2298/SARH1504134M .

Marković, Evgenija, Fercec, Janko, Šćepan, Ivana, Glišić, Branislav, Nedeljković, Nenad, Juloski, Jovana, Rudolf, Rebeka, "The correlation between pain perception among patients with six different orthodontic archwires and the degree of dental crowding" in Srpski arhiv za celokupno lekarstvo, 143, no. 3-4 (2015):134-140,
https://doi.org/10.2298/SARH1504134M . .

TY  - JOUR
AU  - Fercec, Janko
AU  - Kos, Matija
AU  - Bruncko, Mihael
AU  - Anžel, Ivan
AU  - Glišić, Branislav
AU  - Marković, Evgenija
AU  - Rudolf, Rebeka
PY  - 2014
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/1937
AB  - The aim of this paper was to analyse the characteristic properties of six different, commercially available nickel-titanium orthodontic wires with a diameter of 0.305 mm (0.014"). The characteristic properties were determined by using semi-quantitative EDX analyses, DSC analyses for a determination of the phase temperatures, and a tensile test to obtain the mechanical properties of the wires. The investigation of the chemical composition showed an equiatomic NiTi alloy. Analyses of phase temperatures showed that the nickel-titanium orthodontic wires were, in an austenitic microstructure, exhibiting a superelastic effect in the oral environment. The uniaxial tensile stress strain curves showed different values for the beginning and the end of the transformation range during the loading.
PB  - Institute of Metals and Technology
T2  - Materiali in Tehnologije
T1  - Comparison of niti orthodontic archwires and a determination of the characteristic properties
VL  - 48
IS  - 1
SP  - 99
EP  - 104
UR  - https://hdl.handle.net/21.15107/rcub_smile_1937
ER  - 

@article{
author = "Fercec, Janko and Kos, Matija and Bruncko, Mihael and Anžel, Ivan and Glišić, Branislav and Marković, Evgenija and Rudolf, Rebeka",
year = "2014",
abstract = "The aim of this paper was to analyse the characteristic properties of six different, commercially available nickel-titanium orthodontic wires with a diameter of 0.305 mm (0.014"). The characteristic properties were determined by using semi-quantitative EDX analyses, DSC analyses for a determination of the phase temperatures, and a tensile test to obtain the mechanical properties of the wires. The investigation of the chemical composition showed an equiatomic NiTi alloy. Analyses of phase temperatures showed that the nickel-titanium orthodontic wires were, in an austenitic microstructure, exhibiting a superelastic effect in the oral environment. The uniaxial tensile stress strain curves showed different values for the beginning and the end of the transformation range during the loading.",
publisher = "Institute of Metals and Technology",
journal = "Materiali in Tehnologije",
title = "Comparison of niti orthodontic archwires and a determination of the characteristic properties",
volume = "48",
number = "1",
pages = "99-104",
url = "https://hdl.handle.net/21.15107/rcub_smile_1937"
}

Fercec, J., Kos, M., Bruncko, M., Anžel, I., Glišić, B., Marković, E.,& Rudolf, R.. (2014). Comparison of niti orthodontic archwires and a determination of the characteristic properties. in Materiali in Tehnologije
Institute of Metals and Technology., 48(1), 99-104.
https://hdl.handle.net/21.15107/rcub_smile_1937

Fercec J, Kos M, Bruncko M, Anžel I, Glišić B, Marković E, Rudolf R. Comparison of niti orthodontic archwires and a determination of the characteristic properties. in Materiali in Tehnologije. 2014;48(1):99-104.
https://hdl.handle.net/21.15107/rcub_smile_1937 .

Fercec, Janko, Kos, Matija, Bruncko, Mihael, Anžel, Ivan, Glišić, Branislav, Marković, Evgenija, Rudolf, Rebeka, "Comparison of niti orthodontic archwires and a determination of the characteristic properties" in Materiali in Tehnologije, 48, no. 1 (2014):99-104,
https://hdl.handle.net/21.15107/rcub_smile_1937 .

TY  - JOUR
AU  - Fercec, Janko
AU  - Glišić, Branislav
AU  - Šćepan, Ivana
AU  - Marković, Evgenija
AU  - Stamenković, D.
AU  - Anžel, Ivan
AU  - Flasker, J.
AU  - Rudolf, Rebeka
PY  - 2012
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/1767
AB  - This study was addressed to use knowledge about the orthodontic system with numerical simulation of the finite elements method. For the first time we simulated the stresses on the orthodontic system and, in this manner, calculated the orthodontic force on the tooth. A 3D orthodontic model or orthodontic system was designed resembling moderate crowding in the dental arch with all supporting structures. CATIA V5 computer software was used to set up a model for the orthodontic system and ABAQUS was used for simulation of the stresses on the orthodontic system. Our attention was focused on the stresses on the tooth lateral incisor and its periodontal ligament. The results of the numerical simulation showed complex stresses on the tooth lateral incisor and its periodontal ligament. In this paper there is presented a calculation of the orthodontic force acting on the tooth lateral incisor due to the orthodontic wire. This orthodontic force was calculated from the stresses on the bracket. The calculated orthodontic force was in the area which is considered as the optimal orthodontic force for movement of the tooth.
PB  - Polish Acad Sciences Inst Physics, Warsaw
T2  - Acta Physica Polonica A
T1  - Determination of Stresses and Forces on the Orthodontic System by Using Numerical Simulation of the Finite Elements Method
VL  - 122
IS  - 4
SP  - 659
EP  - 665
UR  - https://hdl.handle.net/21.15107/rcub_smile_1767
ER  - 

@article{
author = "Fercec, Janko and Glišić, Branislav and Šćepan, Ivana and Marković, Evgenija and Stamenković, D. and Anžel, Ivan and Flasker, J. and Rudolf, Rebeka",
year = "2012",
abstract = "This study was addressed to use knowledge about the orthodontic system with numerical simulation of the finite elements method. For the first time we simulated the stresses on the orthodontic system and, in this manner, calculated the orthodontic force on the tooth. A 3D orthodontic model or orthodontic system was designed resembling moderate crowding in the dental arch with all supporting structures. CATIA V5 computer software was used to set up a model for the orthodontic system and ABAQUS was used for simulation of the stresses on the orthodontic system. Our attention was focused on the stresses on the tooth lateral incisor and its periodontal ligament. The results of the numerical simulation showed complex stresses on the tooth lateral incisor and its periodontal ligament. In this paper there is presented a calculation of the orthodontic force acting on the tooth lateral incisor due to the orthodontic wire. This orthodontic force was calculated from the stresses on the bracket. The calculated orthodontic force was in the area which is considered as the optimal orthodontic force for movement of the tooth.",
publisher = "Polish Acad Sciences Inst Physics, Warsaw",
journal = "Acta Physica Polonica A",
title = "Determination of Stresses and Forces on the Orthodontic System by Using Numerical Simulation of the Finite Elements Method",
volume = "122",
number = "4",
pages = "659-665",
url = "https://hdl.handle.net/21.15107/rcub_smile_1767"
}

Fercec, J., Glišić, B., Šćepan, I., Marković, E., Stamenković, D., Anžel, I., Flasker, J.,& Rudolf, R.. (2012). Determination of Stresses and Forces on the Orthodontic System by Using Numerical Simulation of the Finite Elements Method. in Acta Physica Polonica A
Polish Acad Sciences Inst Physics, Warsaw., 122(4), 659-665.
https://hdl.handle.net/21.15107/rcub_smile_1767

Fercec J, Glišić B, Šćepan I, Marković E, Stamenković D, Anžel I, Flasker J, Rudolf R. Determination of Stresses and Forces on the Orthodontic System by Using Numerical Simulation of the Finite Elements Method. in Acta Physica Polonica A. 2012;122(4):659-665.
https://hdl.handle.net/21.15107/rcub_smile_1767 .

Fercec, Janko, Glišić, Branislav, Šćepan, Ivana, Marković, Evgenija, Stamenković, D., Anžel, Ivan, Flasker, J., Rudolf, Rebeka, "Determination of Stresses and Forces on the Orthodontic System by Using Numerical Simulation of the Finite Elements Method" in Acta Physica Polonica A, 122, no. 4 (2012):659-665,
https://hdl.handle.net/21.15107/rcub_smile_1767 .