TY  - JOUR
AU  - Jovanović-Medojević, Milica
AU  - Nešković, Jelena
AU  - Popović-Bajić, Marijana
AU  - Stratimirović, Đorđe
AU  - Živković, Slavoljub
PY  - 2022
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/3269
AB  - Introduction/Objective of this study is to use scanning electron microscopy (SEM) analysis to examine surfaces of new and same sets of Ni-Ti instruments after canal preparations, to check their suspectability to corrosion. Methods In this study, we used five different endodontic Ni-Ti instruments: K3, Mtwo, ProTaper Universal, HyFlex and BioRaCe. Instruments were analyzed before and after preparation of canals of different curvature, using SEM (150-2000 ×). Results Corrosion of the working part was observed in 5.5% of new Ni-Ti instruments of the K3 system (apical and middle segment), in 5.5% of Mtwo instruments (apical third), and in 11.1% of ProTaper Universal systems (apical and middle third). Corrosion was not observed on the new instruments of the HyFlex and BioRaCe kits. After instrumentation, disinfection, and sterilization, corrosion was observed in all sets of K3 and ProTaper Universal systems and in all HyFlex instruments of the first group. Corrosion was observed in the HyFlex system in the second group in 16.7% of instruments (apical and middle third) and in the third 83.3% in the apical and 66.7% in the middle segment. In the Mtwo set, corrosion was observed in 16.7% of instruments in the first (apical and middle third), in the second group in 33.3% of instruments in the apical part and 50% in the middle third, while in the third group, corrosion was observed in 16.7% of instruments in the middle third of instruments. Conclusion Rotary Ni-Ti instruments K3 and ProTaper Universal are susceptible to corrosion in a very high percentage. Ni-Ti systems with post-heat treatment of the working part (HyFlex) are somewhat more resistant to corrosion, while in Ni-Ti systems with electropolished surface (BioRaCe), corrosion is not observed.
AB  - Uvod/Cilj Cilj istraživanja je bio da se primenom skenirajuće elektronske mikroskopije (SEM) analiziraju površine nekorišćenih i istih setova nikl-titanijmskih (Ni-Ti) rotirajućih instrumenata nakon preparacije kanala, odnosno da se proveri njihova podložnost za pojavu korozije. Metod U istraživanje je uključeno pet različitih setova mašinskih endodontskih Ni-Ti instrumenata: K3, Mtwo, ProTaper Universal, HyFlex i BioRaCe. Instrumenti su analizirani pre upotrebe i nakon preparacije kanala različite povijenosti, pomoću SEM-a (150-2000 ×). Svaki set instrumenata je korišćen za obradu 10 kanala u tri eksperimentalne grupe (pravi, blago i izrazito povijeni kanali). Rezultati Korozija radnog dela uočena je kod 5,5% novih Ni-Ti instrumenata sistema K3 (apikalni i srednji segment), kod 5,5% Mtwo instrumenta (apikalna trećina) i kod 11,1% sistema ProTaper Universal (apikalna i srednja trećina). Korozija nije uočena na novim instrumentima HyFlex i BioRaCe setova. Nakon instrumentacije, dezinfekcije i sterilizacije korozija je primećena kod svih setova sistema K3 i ProTaper Universal i kod svih HyFlex instrumenata prve grupe. Korozija je uočena kod HyFlex sistema u drugoj grupi kod 16,7% instrumenata (apikalna i srednja trećina), a u trećoj grupi kod 83,3% instrumenata u apikalnom i 66,7% u srednjem segmentu. Kod Mtwo seta korozija je uočena kod 16,7% instrumenata u prvoj grupi (apikalna i srednja trećina), u drugoj grupi kod 33,3% instrumenata u apikalnom delu i 50% u srednjoj trećini, dok je u trećoj grupi korozija primećena kod 16,7% instrumenata u srednjoj trećini instrumenata. Zaključak Rotirajući Ni-Ti instrumenti K3 i ProTaper Universal podložni su koroziji u veoma visokom procentu. Ni-Ti sistemi sa naknadnom termičkom obradom radnog dela (HyFlex) nešto su otporniji na koroziju, dok kod Ni-Ti sistema sa elektropoliranom površinom (BioRaCe) korizija nije uočena.
PB  - Srpsko lekarsko društvo, Beograd
T2  - Srpski arhiv za celokupno lekarstvo
T1  - Effects of sodium hypochlorite on corrosion of the rotary nickel-titanium endodontic instruments - SEM analysis
T1  - Uticaj natrijum-hipohlorita na pojavu korozije rotirajućih Ni-Ti instrumenata - SEM analiza
VL  - 150
IS  - 5-6
SP  - 254
EP  - 260
DO  - 10.2298/SARH210321035J
ER  - 

@article{
author = "Jovanović-Medojević, Milica and Nešković, Jelena and Popović-Bajić, Marijana and Stratimirović, Đorđe and Živković, Slavoljub",
year = "2022",
abstract = "Introduction/Objective of this study is to use scanning electron microscopy (SEM) analysis to examine surfaces of new and same sets of Ni-Ti instruments after canal preparations, to check their suspectability to corrosion. Methods In this study, we used five different endodontic Ni-Ti instruments: K3, Mtwo, ProTaper Universal, HyFlex and BioRaCe. Instruments were analyzed before and after preparation of canals of different curvature, using SEM (150-2000 ×). Results Corrosion of the working part was observed in 5.5% of new Ni-Ti instruments of the K3 system (apical and middle segment), in 5.5% of Mtwo instruments (apical third), and in 11.1% of ProTaper Universal systems (apical and middle third). Corrosion was not observed on the new instruments of the HyFlex and BioRaCe kits. After instrumentation, disinfection, and sterilization, corrosion was observed in all sets of K3 and ProTaper Universal systems and in all HyFlex instruments of the first group. Corrosion was observed in the HyFlex system in the second group in 16.7% of instruments (apical and middle third) and in the third 83.3% in the apical and 66.7% in the middle segment. In the Mtwo set, corrosion was observed in 16.7% of instruments in the first (apical and middle third), in the second group in 33.3% of instruments in the apical part and 50% in the middle third, while in the third group, corrosion was observed in 16.7% of instruments in the middle third of instruments. Conclusion Rotary Ni-Ti instruments K3 and ProTaper Universal are susceptible to corrosion in a very high percentage. Ni-Ti systems with post-heat treatment of the working part (HyFlex) are somewhat more resistant to corrosion, while in Ni-Ti systems with electropolished surface (BioRaCe), corrosion is not observed., Uvod/Cilj Cilj istraživanja je bio da se primenom skenirajuće elektronske mikroskopije (SEM) analiziraju površine nekorišćenih i istih setova nikl-titanijmskih (Ni-Ti) rotirajućih instrumenata nakon preparacije kanala, odnosno da se proveri njihova podložnost za pojavu korozije. Metod U istraživanje je uključeno pet različitih setova mašinskih endodontskih Ni-Ti instrumenata: K3, Mtwo, ProTaper Universal, HyFlex i BioRaCe. Instrumenti su analizirani pre upotrebe i nakon preparacije kanala različite povijenosti, pomoću SEM-a (150-2000 ×). Svaki set instrumenata je korišćen za obradu 10 kanala u tri eksperimentalne grupe (pravi, blago i izrazito povijeni kanali). Rezultati Korozija radnog dela uočena je kod 5,5% novih Ni-Ti instrumenata sistema K3 (apikalni i srednji segment), kod 5,5% Mtwo instrumenta (apikalna trećina) i kod 11,1% sistema ProTaper Universal (apikalna i srednja trećina). Korozija nije uočena na novim instrumentima HyFlex i BioRaCe setova. Nakon instrumentacije, dezinfekcije i sterilizacije korozija je primećena kod svih setova sistema K3 i ProTaper Universal i kod svih HyFlex instrumenata prve grupe. Korozija je uočena kod HyFlex sistema u drugoj grupi kod 16,7% instrumenata (apikalna i srednja trećina), a u trećoj grupi kod 83,3% instrumenata u apikalnom i 66,7% u srednjem segmentu. Kod Mtwo seta korozija je uočena kod 16,7% instrumenata u prvoj grupi (apikalna i srednja trećina), u drugoj grupi kod 33,3% instrumenata u apikalnom delu i 50% u srednjoj trećini, dok je u trećoj grupi korozija primećena kod 16,7% instrumenata u srednjoj trećini instrumenata. Zaključak Rotirajući Ni-Ti instrumenti K3 i ProTaper Universal podložni su koroziji u veoma visokom procentu. Ni-Ti sistemi sa naknadnom termičkom obradom radnog dela (HyFlex) nešto su otporniji na koroziju, dok kod Ni-Ti sistema sa elektropoliranom površinom (BioRaCe) korizija nije uočena.",
publisher = "Srpsko lekarsko društvo, Beograd",
journal = "Srpski arhiv za celokupno lekarstvo",
title = "Effects of sodium hypochlorite on corrosion of the rotary nickel-titanium endodontic instruments - SEM analysis, Uticaj natrijum-hipohlorita na pojavu korozije rotirajućih Ni-Ti instrumenata - SEM analiza",
volume = "150",
number = "5-6",
pages = "254-260",
doi = "10.2298/SARH210321035J"
}

Jovanović-Medojević, M., Nešković, J., Popović-Bajić, M., Stratimirović, Đ.,& Živković, S.. (2022). Effects of sodium hypochlorite on corrosion of the rotary nickel-titanium endodontic instruments - SEM analysis. in Srpski arhiv za celokupno lekarstvo
Srpsko lekarsko društvo, Beograd., 150(5-6), 254-260.
https://doi.org/10.2298/SARH210321035J

Jovanović-Medojević M, Nešković J, Popović-Bajić M, Stratimirović Đ, Živković S. Effects of sodium hypochlorite on corrosion of the rotary nickel-titanium endodontic instruments - SEM analysis. in Srpski arhiv za celokupno lekarstvo. 2022;150(5-6):254-260.
doi:10.2298/SARH210321035J .

Jovanović-Medojević, Milica, Nešković, Jelena, Popović-Bajić, Marijana, Stratimirović, Đorđe, Živković, Slavoljub, "Effects of sodium hypochlorite on corrosion of the rotary nickel-titanium endodontic instruments - SEM analysis" in Srpski arhiv za celokupno lekarstvo, 150, no. 5-6 (2022):254-260,
https://doi.org/10.2298/SARH210321035J . .

TY  - JOUR
AU  - Jovanović-Medojević, Milica
AU  - Milanović, Ivana
AU  - Zdravković, Alena
AU  - Stratimirović, Đorđe
PY  - 2021
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/3277
AB  - Introduction. Deformations and fractures of Ni-Ti instruments during chemomechanical instrumentation of root canals occur due to the action of cyclic and torsional forces. The aim of this research was to analyze the surfaces of the working parts of Mtwo instruments after preparation of root canals with different curvatures using SEM and determine possible changes and deformations after instrumentation. Materials and methods. The study included 3 sets of Mtwo (VDW, Munich, Germany) instruments. Each set was used to instrument 10 canals in three experimental groups (straight, slightly curved, and highly curved canals). Instrumentation was carried out using crown-down technique with the following irrigation solutions, 2% NaOCl (CHLORAXID 2%, Cerkamed, Polska) and Distilled water (Iva, Serbia) in the amount of 5 cm3. The apical and middle third of the instruments were scanned in two directions using SEM at different magnifications (150-2000X). The SEM images were analyzed using qualitative analysis for the presence of different irregularities according to Eggert et al. Statistical analysis of obtained data was performed using Fisher test at a confidence level of 5% (α = 0.05). Results. Most defects (37.3%) were observed in instruments used in highly curved canals, followed by the instruments of the second group (35.6%), and the least defects were (27.1%) observed in the group with straight canals. Higher prevalence of defects was observed in the apical thirds of instruments (54.2%), especially in the experimental group of curved canals where the highest presence was observed (20.3%). The presence of production grooves was observed in all instruments, and the most common types of defects after instrumentation were the appearance of corrosion and changes in the cutting edges. In the group with extremely curved canals fractures were observed in two instruments (10/0.04 and 15/0.05). Conclusion. Root canal curvature significantly affects the occurrence of deformations and fractures of Ni-Ti rotating instruments. The most common types of defects were grooves, corrosion and changes in the blade edges. Mtwo instruments showed deformations in terms of thread changes, microfractures and two complete fractures.
AB  - Uvod Deformacije i fraktura Ni-Ti instrumenata tokom hemomehaničke obrade kanala nastaju usled dejstva cikličnih i torzionih sila. Cilj ovog istraživanja je bio da se primenom SEM-a analiziraju površine radnog dela MTwo instrumenata nakon preparacije kanala različite povijenosti i utvrdi eventualno postojanje promena i deformacija nakon instrumentacije. Materijali i metode U istraživanje su uključena tri seta MTwo (VDW, Munich, Germany) instrumenata. Svaki set je korišćen za obradu 10 kanala u tri eksperimentalne grupe (pravi, blago povijeni i izrazito povijeni kanali). Instrumentacija je realizovana kruničnoapeksnom tehnikom, a kao irigansi su primenjeni u količini od po 5 cm³, 2% rastvor NaOCl (CHLORAXID 2%, Cerkamed, Poljska) i destilovana voda (Iva, Srbija). SE snimci apikalne i srednje trećine instrumenata iz dva različita pravca, snimani pomoću SEM-a, na različitim uvećanjima (150-2000×) analizirani su kvalitativnom analizom prisustva različitih nepravilnosti po Edžeru i sar. Statistička analiza dobijenih podataka urađena je primenom Fišerovog testa na nivou pouzdanosti od 5% ( a = 0,05). Rezultati Najviše defekata (37,3%) uočeno je na instrumentima koji su upotrebljeni za obradu izrazito povijenih kanala, zatim na instrumentima druge grupe (35,6%), a najmanje defekata je bilo (27,1%) u grupi sa pravim kanalima. Veća zastupljenost defekata se uočava na apikalnoj trećini instrumenata (54,2%), posebno u trećoj eksperimentalnoj grupi, gde je uočeno najveće prisustvo - 20,3%. Uočeno je prisustvo proizvodnih žlebova na svim instrumentima, a najučestaliji tipovi defekta nakon instrumentacije su bili pojava korozije i promene sečivnih ivica. Uočene su frakture na dva instrumenta (10/0,04 i 15/0,05) u grupi sa izuzetno povijenim kanalima. Zaključak Na osnovu rezultata ove studije može se zaključiti da povijenost korenskog kanala znatno utiče na pojavu deformacija i prelom Ni-Ti rotirajućih instrumenata. Najučestaliji tipovi defekata su bili žlebovi, korozija i promene sečivnih ivica. MTwo instrumenti su pokazali deformacije u vidi promene navoja, mikrofraktura i dve kompletne frakture.
PB  - Srpsko lekarsko društvo - Stomatološka sekcija, Beograd
T2  - Stomatološki glasnik Srbije
T1  - Sem analysis of Mtwo instruments after instrumentation of root canals with different curvatures
T1  - Analiza defekata MTwo instrumenata posle obrade kanala različite povijenosti (SEM)
VL  - 68
IS  - 3
SP  - 131
EP  - 142
DO  - 10.2298/SGS2103131J
ER  - 

@article{
author = "Jovanović-Medojević, Milica and Milanović, Ivana and Zdravković, Alena and Stratimirović, Đorđe",
year = "2021",
abstract = "Introduction. Deformations and fractures of Ni-Ti instruments during chemomechanical instrumentation of root canals occur due to the action of cyclic and torsional forces. The aim of this research was to analyze the surfaces of the working parts of Mtwo instruments after preparation of root canals with different curvatures using SEM and determine possible changes and deformations after instrumentation. Materials and methods. The study included 3 sets of Mtwo (VDW, Munich, Germany) instruments. Each set was used to instrument 10 canals in three experimental groups (straight, slightly curved, and highly curved canals). Instrumentation was carried out using crown-down technique with the following irrigation solutions, 2% NaOCl (CHLORAXID 2%, Cerkamed, Polska) and Distilled water (Iva, Serbia) in the amount of 5 cm3. The apical and middle third of the instruments were scanned in two directions using SEM at different magnifications (150-2000X). The SEM images were analyzed using qualitative analysis for the presence of different irregularities according to Eggert et al. Statistical analysis of obtained data was performed using Fisher test at a confidence level of 5% (α = 0.05). Results. Most defects (37.3%) were observed in instruments used in highly curved canals, followed by the instruments of the second group (35.6%), and the least defects were (27.1%) observed in the group with straight canals. Higher prevalence of defects was observed in the apical thirds of instruments (54.2%), especially in the experimental group of curved canals where the highest presence was observed (20.3%). The presence of production grooves was observed in all instruments, and the most common types of defects after instrumentation were the appearance of corrosion and changes in the cutting edges. In the group with extremely curved canals fractures were observed in two instruments (10/0.04 and 15/0.05). Conclusion. Root canal curvature significantly affects the occurrence of deformations and fractures of Ni-Ti rotating instruments. The most common types of defects were grooves, corrosion and changes in the blade edges. Mtwo instruments showed deformations in terms of thread changes, microfractures and two complete fractures., Uvod Deformacije i fraktura Ni-Ti instrumenata tokom hemomehaničke obrade kanala nastaju usled dejstva cikličnih i torzionih sila. Cilj ovog istraživanja je bio da se primenom SEM-a analiziraju površine radnog dela MTwo instrumenata nakon preparacije kanala različite povijenosti i utvrdi eventualno postojanje promena i deformacija nakon instrumentacije. Materijali i metode U istraživanje su uključena tri seta MTwo (VDW, Munich, Germany) instrumenata. Svaki set je korišćen za obradu 10 kanala u tri eksperimentalne grupe (pravi, blago povijeni i izrazito povijeni kanali). Instrumentacija je realizovana kruničnoapeksnom tehnikom, a kao irigansi su primenjeni u količini od po 5 cm³, 2% rastvor NaOCl (CHLORAXID 2%, Cerkamed, Poljska) i destilovana voda (Iva, Srbija). SE snimci apikalne i srednje trećine instrumenata iz dva različita pravca, snimani pomoću SEM-a, na različitim uvećanjima (150-2000×) analizirani su kvalitativnom analizom prisustva različitih nepravilnosti po Edžeru i sar. Statistička analiza dobijenih podataka urađena je primenom Fišerovog testa na nivou pouzdanosti od 5% ( a = 0,05). Rezultati Najviše defekata (37,3%) uočeno je na instrumentima koji su upotrebljeni za obradu izrazito povijenih kanala, zatim na instrumentima druge grupe (35,6%), a najmanje defekata je bilo (27,1%) u grupi sa pravim kanalima. Veća zastupljenost defekata se uočava na apikalnoj trećini instrumenata (54,2%), posebno u trećoj eksperimentalnoj grupi, gde je uočeno najveće prisustvo - 20,3%. Uočeno je prisustvo proizvodnih žlebova na svim instrumentima, a najučestaliji tipovi defekta nakon instrumentacije su bili pojava korozije i promene sečivnih ivica. Uočene su frakture na dva instrumenta (10/0,04 i 15/0,05) u grupi sa izuzetno povijenim kanalima. Zaključak Na osnovu rezultata ove studije može se zaključiti da povijenost korenskog kanala znatno utiče na pojavu deformacija i prelom Ni-Ti rotirajućih instrumenata. Najučestaliji tipovi defekata su bili žlebovi, korozija i promene sečivnih ivica. MTwo instrumenti su pokazali deformacije u vidi promene navoja, mikrofraktura i dve kompletne frakture.",
publisher = "Srpsko lekarsko društvo - Stomatološka sekcija, Beograd",
journal = "Stomatološki glasnik Srbije",
title = "Sem analysis of Mtwo instruments after instrumentation of root canals with different curvatures, Analiza defekata MTwo instrumenata posle obrade kanala različite povijenosti (SEM)",
volume = "68",
number = "3",
pages = "131-142",
doi = "10.2298/SGS2103131J"
}

Jovanović-Medojević, M., Milanović, I., Zdravković, A.,& Stratimirović, Đ.. (2021). Sem analysis of Mtwo instruments after instrumentation of root canals with different curvatures. in Stomatološki glasnik Srbije
Srpsko lekarsko društvo - Stomatološka sekcija, Beograd., 68(3), 131-142.
https://doi.org/10.2298/SGS2103131J

Jovanović-Medojević M, Milanović I, Zdravković A, Stratimirović Đ. Sem analysis of Mtwo instruments after instrumentation of root canals with different curvatures. in Stomatološki glasnik Srbije. 2021;68(3):131-142.
doi:10.2298/SGS2103131J .

Jovanović-Medojević, Milica, Milanović, Ivana, Zdravković, Alena, Stratimirović, Đorđe, "Sem analysis of Mtwo instruments after instrumentation of root canals with different curvatures" in Stomatološki glasnik Srbije, 68, no. 3 (2021):131-142,
https://doi.org/10.2298/SGS2103131J . .

TY  - JOUR
AU  - Jovanović-Medojević, Milica
AU  - Zdravković, Alena
AU  - Medojević, Mina
AU  - Stratimirović, Đorđe
PY  - 2021
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/3275
AB  - Introduction. Modern endodontic procedure implies the use of rotary Ni-Ti instruments during chemomechanical treatment of root canals. The aim of this study is to analyze the surfaces of new (unused) rotary endodontic instruments using the SEM-EDS method and determine how frequently manufacture defects or impurities appear on their working surfaces. Material and method. Five new different sets of rotary endodontic Ni-Ti instruments were included in this study: K3, Mtwo, ProTaper Universal, HyFlex and BioRaCe. The working part of endodontic instrument was analyzed using SEMEDS method (magnifications ×150 to ×2000), which determined the morphological characteristics of the instrument surface and chemical composition of the found impurities. Statistical analysis was performed using the Fisher’s test (p < 0.05). Results. The results of SEM-EDS analysis showed that there is no new instrument without defects on its surface. The most common defects were observed in K3 (27.43%) and ProTaper Universal group (27.21%) and the least were in BioRaCe instruments (7.67%). The most common type of defect in tested instruments was fretting. In addition, the presence of debris and metal strips was found on all instruments, while corrosion of the working part was observed only in K3, ProTaper Universal and Mtwo systems in a small percentage. Conclusion. Based on the results of this research, it can be concluded that manufacturing defects were noticed in all examined instruments. The most common defect is pitting. Impurities such as debris and metal strips have also been registered. No organic debris was observed on electropolished surface of BioRaCe instruments, but a small percentage of other types of defects were registered.
AB  - Uvod Moderna endodontska procedura podrazumeva upotrebu mašinskih rotirajućih Ni-Ti instrumenata tokom hemomehaničke obrade kanala korena. Cilj ovog rada je bio da se primenom SEM-EDS metode analiziraju površine novih (neupotrebljenih) rotirajućih endodontskih instrumenata i utvrdi učestalost pojave proizvodnih defekata ili nečistoća na njihovim radnim površinama. Materijal i metoda U istraživanje je uključeno pet različitih novih setova mašinskih endodontskih Ni-Ti instrumenata: K3, Mtwo, ProTaper Universal, HyFlex i BioRaCe. Radni deo svakog instrumenta je podvrgnut SEM-EDS analizi (uvećanja ×150 do ×2000), čime su utvrđene morfološke karakteristike površine instrumenata i hemijski sastav zatečenih nečistoća. Statistička analiza je urađena primenom Fišer testa (p < 0,05). Rezultati Rezultati SEM-EDS analize su pokazali da ne postoji nijedan novi instrument bez defekta na svojoj površini. Najučestaliji defekti su uočeni kod K3 (27,43%) i ProTaper Universal grupe (27,21%), a najmanje ih je bilo na BioRaCe instrumentima (7,67%). Najzastupljeniji tip defekata kod testiranih instrumenata je bilo prisustvo žljebova. Osim toga, utvrđeno je i prisustvo debrisa i metalnih opiljaka na svim instrumentima, dok je korozija radnog dela primećena samo kod K3, ProTaper Universal i Mtwo sistema u malom procentu. Zaključak Na osnovu rezultata ovog istraživanja može se zaključiti da su na svim ispitivanim instrumentima uočeni proizvodni defekti, od kojih su najzastupljeniji žljebovi. Takođe su registrovane i nečistoće kao što su debrisa i metalni opiljci. Na elektropoliranoj površini BioRaCe instrumenata nije uočeno prisustvo organskog debrisa, ali je registrovan Mali procenat ostalih tipova defekata.
PB  - Srpsko lekarsko društvo - Stomatološka sekcija, Beograd
T2  - Stomatološki glasnik Srbije
T1  - Evaluation of surface characteristics of new rotary nickel-titanium instruments - SEM-EDS analysis
T1  - Karakteristike površine novih rotirajućih nikl-titanijumskih instrumenata - SEM-EDS analiza
VL  - 68
IS  - 1
SP  - 19
EP  - 30
DO  - 10.2298/SGS2101019J
ER  - 

@article{
author = "Jovanović-Medojević, Milica and Zdravković, Alena and Medojević, Mina and Stratimirović, Đorđe",
year = "2021",
abstract = "Introduction. Modern endodontic procedure implies the use of rotary Ni-Ti instruments during chemomechanical treatment of root canals. The aim of this study is to analyze the surfaces of new (unused) rotary endodontic instruments using the SEM-EDS method and determine how frequently manufacture defects or impurities appear on their working surfaces. Material and method. Five new different sets of rotary endodontic Ni-Ti instruments were included in this study: K3, Mtwo, ProTaper Universal, HyFlex and BioRaCe. The working part of endodontic instrument was analyzed using SEMEDS method (magnifications ×150 to ×2000), which determined the morphological characteristics of the instrument surface and chemical composition of the found impurities. Statistical analysis was performed using the Fisher’s test (p < 0.05). Results. The results of SEM-EDS analysis showed that there is no new instrument without defects on its surface. The most common defects were observed in K3 (27.43%) and ProTaper Universal group (27.21%) and the least were in BioRaCe instruments (7.67%). The most common type of defect in tested instruments was fretting. In addition, the presence of debris and metal strips was found on all instruments, while corrosion of the working part was observed only in K3, ProTaper Universal and Mtwo systems in a small percentage. Conclusion. Based on the results of this research, it can be concluded that manufacturing defects were noticed in all examined instruments. The most common defect is pitting. Impurities such as debris and metal strips have also been registered. No organic debris was observed on electropolished surface of BioRaCe instruments, but a small percentage of other types of defects were registered., Uvod Moderna endodontska procedura podrazumeva upotrebu mašinskih rotirajućih Ni-Ti instrumenata tokom hemomehaničke obrade kanala korena. Cilj ovog rada je bio da se primenom SEM-EDS metode analiziraju površine novih (neupotrebljenih) rotirajućih endodontskih instrumenata i utvrdi učestalost pojave proizvodnih defekata ili nečistoća na njihovim radnim površinama. Materijal i metoda U istraživanje je uključeno pet različitih novih setova mašinskih endodontskih Ni-Ti instrumenata: K3, Mtwo, ProTaper Universal, HyFlex i BioRaCe. Radni deo svakog instrumenta je podvrgnut SEM-EDS analizi (uvećanja ×150 do ×2000), čime su utvrđene morfološke karakteristike površine instrumenata i hemijski sastav zatečenih nečistoća. Statistička analiza je urađena primenom Fišer testa (p < 0,05). Rezultati Rezultati SEM-EDS analize su pokazali da ne postoji nijedan novi instrument bez defekta na svojoj površini. Najučestaliji defekti su uočeni kod K3 (27,43%) i ProTaper Universal grupe (27,21%), a najmanje ih je bilo na BioRaCe instrumentima (7,67%). Najzastupljeniji tip defekata kod testiranih instrumenata je bilo prisustvo žljebova. Osim toga, utvrđeno je i prisustvo debrisa i metalnih opiljaka na svim instrumentima, dok je korozija radnog dela primećena samo kod K3, ProTaper Universal i Mtwo sistema u malom procentu. Zaključak Na osnovu rezultata ovog istraživanja može se zaključiti da su na svim ispitivanim instrumentima uočeni proizvodni defekti, od kojih su najzastupljeniji žljebovi. Takođe su registrovane i nečistoće kao što su debrisa i metalni opiljci. Na elektropoliranoj površini BioRaCe instrumenata nije uočeno prisustvo organskog debrisa, ali je registrovan Mali procenat ostalih tipova defekata.",
publisher = "Srpsko lekarsko društvo - Stomatološka sekcija, Beograd",
journal = "Stomatološki glasnik Srbije",
title = "Evaluation of surface characteristics of new rotary nickel-titanium instruments - SEM-EDS analysis, Karakteristike površine novih rotirajućih nikl-titanijumskih instrumenata - SEM-EDS analiza",
volume = "68",
number = "1",
pages = "19-30",
doi = "10.2298/SGS2101019J"
}

Jovanović-Medojević, M., Zdravković, A., Medojević, M.,& Stratimirović, Đ.. (2021). Evaluation of surface characteristics of new rotary nickel-titanium instruments - SEM-EDS analysis. in Stomatološki glasnik Srbije
Srpsko lekarsko društvo - Stomatološka sekcija, Beograd., 68(1), 19-30.
https://doi.org/10.2298/SGS2101019J

Jovanović-Medojević M, Zdravković A, Medojević M, Stratimirović Đ. Evaluation of surface characteristics of new rotary nickel-titanium instruments - SEM-EDS analysis. in Stomatološki glasnik Srbije. 2021;68(1):19-30.
doi:10.2298/SGS2101019J .

Jovanović-Medojević, Milica, Zdravković, Alena, Medojević, Mina, Stratimirović, Đorđe, "Evaluation of surface characteristics of new rotary nickel-titanium instruments - SEM-EDS analysis" in Stomatološki glasnik Srbije, 68, no. 1 (2021):19-30,
https://doi.org/10.2298/SGS2101019J . .

TY  - JOUR
AU  - Jovanović-Medojević, Milica
AU  - Pelemiš, Martina
AU  - Nešković, Jelena
AU  - Popović-Bajić, Marijana
AU  - Stratimirović, Đorđe
AU  - Živković, Slavoljub
PY  - 2020
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/3278
AB  - Introduction. The aim of this study was to analyze working surfaces of new hand endodontic instruments and to check possible existence of dirt or defects on working surface that resulted from manufacturing process using SEM. Material and methods. Three sets of new hand instruments: K-File (KF), (18 instruments) (Dentsply Maillefer, Switzerland) and Hedstorm Files (HF), (18 instruments) (SybronEndo Co, USA) were used. Instruments were analyzed by SEM method at 170× magnification while semi-quantitative EDS analysis was used to determine chemical composition of dirt particles. Fisher test (p < 0.05) was applied in statistical analysis. Results. Results showed that none of the instruments was defect-free. The most common defects were metal strips and fretting noticed at the surface of all tested instruments. Debris was present on all KF (100% in apical and middle third) and HF (56% in apical and 56% in middle third) instruments. Pitting was noticed in KF (33% in apical and 39% in middle third) and HF (11% in apical and 6% in middle third) instruments. Corrosion of working surface, metal flash and disruption of cutting edge were marked only in KF group. Conclusion. Manufacturing defects were noticed in all instruments and the most common type of irregularity were metal strips and fretting.
AB  - Uvod Cilj ovog rada je bio da se primenom skenirajuće elektronske mikroskopije analiziraju površine novih ručnih endodontskih instrumenata i proveri eventualno postojanje proizvodnih nečistoća ili defekata na radnom delu. Materijal i metod U istraživanju su korišćena po tri seta novih ručnih instrumenata: K-File (KF), (18 instrumenata) (Dentsply Maillefer, Switzerland) i Hedstorm Files (HF), (18 instrumenata) (SybronEndo Co, USA). Instrumenti su podvrgnuti SEM analizi sa uvećanjem 170×, a semikvantitativnom EDXS analizom utvrđivan je hemijski sastav nečistoće. Statistička analiza je urađena primenom Fišerovog testa (p < 0,05). Rezultati Rezultati su pokazali da ne postoji nijedan instrument bez defekta. Najučestaliji tip defekta je bilo prisustvo metalnih opiljaka i žlebova, koji su uočeni na površini svih ispitivanih instrumenata. Debri je uočen na svim KF (100% apikalno i u srednjoj trećini) i HF (56% apikalno i 56% u srednjoj trećini). Prisustvo udubljenja zabeleženo je kod KF (33% apikalno i 39% u srednjoj trećini) i HF (11% apikalno i 6% u srednjoj trećini). Korozija radne površine, pojava uglačane površine i prekid sečivne ivice su uočeni samo u grupi KF. Zaključak Na svim ispitivanim ručnim instrumentima su uočeni proizvodni defekti, a najučestaliji tip nepravilnosti je bilo prisustvo metalnih opiljaka i žlebova.
PB  - Srpsko lekarsko društvo - Stomatološka sekcija, Beograd
T2  - Stomatološki glasnik Srbije
T1  - Sem analysis of working surface in new manual endodontic instruments
T1  - SEM analiza površine radnog dela novih ručnih endodontskih instrumenata
VL  - 67
IS  - 1
SP  - 15
EP  - 26
DO  - 10.2298/SGS2001015J
ER  - 

@article{
author = "Jovanović-Medojević, Milica and Pelemiš, Martina and Nešković, Jelena and Popović-Bajić, Marijana and Stratimirović, Đorđe and Živković, Slavoljub",
year = "2020",
abstract = "Introduction. The aim of this study was to analyze working surfaces of new hand endodontic instruments and to check possible existence of dirt or defects on working surface that resulted from manufacturing process using SEM. Material and methods. Three sets of new hand instruments: K-File (KF), (18 instruments) (Dentsply Maillefer, Switzerland) and Hedstorm Files (HF), (18 instruments) (SybronEndo Co, USA) were used. Instruments were analyzed by SEM method at 170× magnification while semi-quantitative EDS analysis was used to determine chemical composition of dirt particles. Fisher test (p < 0.05) was applied in statistical analysis. Results. Results showed that none of the instruments was defect-free. The most common defects were metal strips and fretting noticed at the surface of all tested instruments. Debris was present on all KF (100% in apical and middle third) and HF (56% in apical and 56% in middle third) instruments. Pitting was noticed in KF (33% in apical and 39% in middle third) and HF (11% in apical and 6% in middle third) instruments. Corrosion of working surface, metal flash and disruption of cutting edge were marked only in KF group. Conclusion. Manufacturing defects were noticed in all instruments and the most common type of irregularity were metal strips and fretting., Uvod Cilj ovog rada je bio da se primenom skenirajuće elektronske mikroskopije analiziraju površine novih ručnih endodontskih instrumenata i proveri eventualno postojanje proizvodnih nečistoća ili defekata na radnom delu. Materijal i metod U istraživanju su korišćena po tri seta novih ručnih instrumenata: K-File (KF), (18 instrumenata) (Dentsply Maillefer, Switzerland) i Hedstorm Files (HF), (18 instrumenata) (SybronEndo Co, USA). Instrumenti su podvrgnuti SEM analizi sa uvećanjem 170×, a semikvantitativnom EDXS analizom utvrđivan je hemijski sastav nečistoće. Statistička analiza je urađena primenom Fišerovog testa (p < 0,05). Rezultati Rezultati su pokazali da ne postoji nijedan instrument bez defekta. Najučestaliji tip defekta je bilo prisustvo metalnih opiljaka i žlebova, koji su uočeni na površini svih ispitivanih instrumenata. Debri je uočen na svim KF (100% apikalno i u srednjoj trećini) i HF (56% apikalno i 56% u srednjoj trećini). Prisustvo udubljenja zabeleženo je kod KF (33% apikalno i 39% u srednjoj trećini) i HF (11% apikalno i 6% u srednjoj trećini). Korozija radne površine, pojava uglačane površine i prekid sečivne ivice su uočeni samo u grupi KF. Zaključak Na svim ispitivanim ručnim instrumentima su uočeni proizvodni defekti, a najučestaliji tip nepravilnosti je bilo prisustvo metalnih opiljaka i žlebova.",
publisher = "Srpsko lekarsko društvo - Stomatološka sekcija, Beograd",
journal = "Stomatološki glasnik Srbije",
title = "Sem analysis of working surface in new manual endodontic instruments, SEM analiza površine radnog dela novih ručnih endodontskih instrumenata",
volume = "67",
number = "1",
pages = "15-26",
doi = "10.2298/SGS2001015J"
}

Jovanović-Medojević, M., Pelemiš, M., Nešković, J., Popović-Bajić, M., Stratimirović, Đ.,& Živković, S.. (2020). Sem analysis of working surface in new manual endodontic instruments. in Stomatološki glasnik Srbije
Srpsko lekarsko društvo - Stomatološka sekcija, Beograd., 67(1), 15-26.
https://doi.org/10.2298/SGS2001015J

Jovanović-Medojević M, Pelemiš M, Nešković J, Popović-Bajić M, Stratimirović Đ, Živković S. Sem analysis of working surface in new manual endodontic instruments. in Stomatološki glasnik Srbije. 2020;67(1):15-26.
doi:10.2298/SGS2001015J .

Jovanović-Medojević, Milica, Pelemiš, Martina, Nešković, Jelena, Popović-Bajić, Marijana, Stratimirović, Đorđe, Živković, Slavoljub, "Sem analysis of working surface in new manual endodontic instruments" in Stomatološki glasnik Srbije, 67, no. 1 (2020):15-26,
https://doi.org/10.2298/SGS2001015J . .

TY  - JOUR
AU  - Jovanović-Medojević, Milica
AU  - Pelemiš, Martina
AU  - Nešković, Jelena
AU  - Popović-Bajić, Marijana
AU  - Stratimirović, Đorđe
AU  - Živković, Slavoljub
PY  - 2020
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/3268
AB  - Introduction/Objective. The objective of this study is to use scanning electron microscopy (SEM) to analyze working surfaces of new manual and rotary endodontic instruments and to check possible existence of manufacture dirt particles or defects on the working surface. Methods. In this study, we used three sets of new manual instruments: K-File, KF (Dentsply Maillefer, Switzerland) and Hedstorm Files, HF (SybronEndo Co, USA) and three sets of mechanical Ni-Ti instruments – type K3 (SybronEndo Co, USA) and BioRaCe (FKG DENTAIRE Swiss Dental Products, Switzerland). The instruments were analyzed using SEM method at 170 × magnification while semi-quantitative energy dispersive x-ray analysis was used to determine chemical composition of dirt particles. Fisher test (p < 0.05) was applied in statistical analysis. Results. Results showed that none of the instruments were defect-free. The most common defect type was the presence of metal strips, which were noticed at the surface of all tested instruments. Debris was present on all manual and only one type of mechanical instruments, K3 (39% in the apical and 33% in the middle third). Fretting was noticed in all manual KF and all mechanical instruments of the K3 group. Pitting was common in all manual instruments, KF (33% in the apical and 39% in the middle third) and HF (11% in the apical and 6% in the middle third). Corrosion of the working surface, metal flash, and disruption of the cutting edge were marked only in the KF group. Conclusion. Manufacture defects were noticed in all instruments and the most common type of irregularity were metal strips. Electropolished surface of BioRaCe instruments showed no debris of organic origin.
AB  - Uvod/Cilj Cilj ovog rada je bio da se primenom skenirajuće elektronske mikroskopije (SEM) analiziraju površine novih ručnih i mašinskih endodontskih instrumenata i proveri eventualno postojanje proizvodnih nečistoća ili defekata na radnom delu. Metode U istraživanju su korišćena po tri seta novih ručnih instrumenata: K-File, KF (Dentsply Maillefer, Švajcarska) i Hedstorm Files, HF (SybronEndo Co, SAD) i po tri seta mašinskih Ni-Ti instrumenata, tipa K3 (SybronEndo Co) i BioRaCe (FKG DENTAIRE Swiss Dental Products, Švajcarska). Instrumenti su podvrgnuti SEM analizi sa uvećanjem 170×, a semikvantitativnom, EDXS analizom utvrđivan je hemijski sastav nečistoće. Statistička analiza je urađena primenom Fišerovog testa (p < 0,05). Rezultati Rezultati su pokazali da ne postoji nijedan instrument bez defekta. Najučestaliji tip defekta je bilo prisustvo metalnih opiljaka, koji su uočeni na površini svih ispitivanih instrumenata. Debri je uočen na svim ručnim i samo na jednom tipu mašinskih instrumenata, K3 (39% na apikalnoj i 33% na srednjoj trećini). Žlebovi su uočeni na svim ručnim KF i svim mašinskim instrumentima grupe K3. Prisustvo udubljenja zabeleženo je kod ručnih instrumenata, KF (33% apikalna i 39% srednja trećina) i HF (11% apikalna i 6% srednja trećina). Korozija radne površine, pojava uglačane površine i prekid sečivne ivice su uočeni samo u grupi KF. Zaključak Na svim ispitivanim instrumentima su uočeni proizvodni defekti, a najučestaliji tip nepravilnosti su metalni opiljci. Na elektropoliranoj površini instrumenata BioRaCe nije uočeno prisustvo organskog debrija.
PB  - Srpsko lekarsko društvo, Beograd
T2  - Srpski arhiv za celokupno lekarstvo
T1  - Analysis of working surface in new manual and rotary endodontic instruments (scanning electron microscopy)
T1  - Analiza površine radnog dela novih ručnih i mašinskih endodontskih instrumenata (skenirajuća elektronska mikroskopija)
VL  - 148
IS  - 7-8
SP  - 398
EP  - 403
DO  - 10.2298/SARH190704018J
ER  - 

@article{
author = "Jovanović-Medojević, Milica and Pelemiš, Martina and Nešković, Jelena and Popović-Bajić, Marijana and Stratimirović, Đorđe and Živković, Slavoljub",
year = "2020",
abstract = "Introduction/Objective. The objective of this study is to use scanning electron microscopy (SEM) to analyze working surfaces of new manual and rotary endodontic instruments and to check possible existence of manufacture dirt particles or defects on the working surface. Methods. In this study, we used three sets of new manual instruments: K-File, KF (Dentsply Maillefer, Switzerland) and Hedstorm Files, HF (SybronEndo Co, USA) and three sets of mechanical Ni-Ti instruments – type K3 (SybronEndo Co, USA) and BioRaCe (FKG DENTAIRE Swiss Dental Products, Switzerland). The instruments were analyzed using SEM method at 170 × magnification while semi-quantitative energy dispersive x-ray analysis was used to determine chemical composition of dirt particles. Fisher test (p < 0.05) was applied in statistical analysis. Results. Results showed that none of the instruments were defect-free. The most common defect type was the presence of metal strips, which were noticed at the surface of all tested instruments. Debris was present on all manual and only one type of mechanical instruments, K3 (39% in the apical and 33% in the middle third). Fretting was noticed in all manual KF and all mechanical instruments of the K3 group. Pitting was common in all manual instruments, KF (33% in the apical and 39% in the middle third) and HF (11% in the apical and 6% in the middle third). Corrosion of the working surface, metal flash, and disruption of the cutting edge were marked only in the KF group. Conclusion. Manufacture defects were noticed in all instruments and the most common type of irregularity were metal strips. Electropolished surface of BioRaCe instruments showed no debris of organic origin., Uvod/Cilj Cilj ovog rada je bio da se primenom skenirajuće elektronske mikroskopije (SEM) analiziraju površine novih ručnih i mašinskih endodontskih instrumenata i proveri eventualno postojanje proizvodnih nečistoća ili defekata na radnom delu. Metode U istraživanju su korišćena po tri seta novih ručnih instrumenata: K-File, KF (Dentsply Maillefer, Švajcarska) i Hedstorm Files, HF (SybronEndo Co, SAD) i po tri seta mašinskih Ni-Ti instrumenata, tipa K3 (SybronEndo Co) i BioRaCe (FKG DENTAIRE Swiss Dental Products, Švajcarska). Instrumenti su podvrgnuti SEM analizi sa uvećanjem 170×, a semikvantitativnom, EDXS analizom utvrđivan je hemijski sastav nečistoće. Statistička analiza je urađena primenom Fišerovog testa (p < 0,05). Rezultati Rezultati su pokazali da ne postoji nijedan instrument bez defekta. Najučestaliji tip defekta je bilo prisustvo metalnih opiljaka, koji su uočeni na površini svih ispitivanih instrumenata. Debri je uočen na svim ručnim i samo na jednom tipu mašinskih instrumenata, K3 (39% na apikalnoj i 33% na srednjoj trećini). Žlebovi su uočeni na svim ručnim KF i svim mašinskim instrumentima grupe K3. Prisustvo udubljenja zabeleženo je kod ručnih instrumenata, KF (33% apikalna i 39% srednja trećina) i HF (11% apikalna i 6% srednja trećina). Korozija radne površine, pojava uglačane površine i prekid sečivne ivice su uočeni samo u grupi KF. Zaključak Na svim ispitivanim instrumentima su uočeni proizvodni defekti, a najučestaliji tip nepravilnosti su metalni opiljci. Na elektropoliranoj površini instrumenata BioRaCe nije uočeno prisustvo organskog debrija.",
publisher = "Srpsko lekarsko društvo, Beograd",
journal = "Srpski arhiv za celokupno lekarstvo",
title = "Analysis of working surface in new manual and rotary endodontic instruments (scanning electron microscopy), Analiza površine radnog dela novih ručnih i mašinskih endodontskih instrumenata (skenirajuća elektronska mikroskopija)",
volume = "148",
number = "7-8",
pages = "398-403",
doi = "10.2298/SARH190704018J"
}

Jovanović-Medojević, M., Pelemiš, M., Nešković, J., Popović-Bajić, M., Stratimirović, Đ.,& Živković, S.. (2020). Analysis of working surface in new manual and rotary endodontic instruments (scanning electron microscopy). in Srpski arhiv za celokupno lekarstvo
Srpsko lekarsko društvo, Beograd., 148(7-8), 398-403.
https://doi.org/10.2298/SARH190704018J

Jovanović-Medojević M, Pelemiš M, Nešković J, Popović-Bajić M, Stratimirović Đ, Živković S. Analysis of working surface in new manual and rotary endodontic instruments (scanning electron microscopy). in Srpski arhiv za celokupno lekarstvo. 2020;148(7-8):398-403.
doi:10.2298/SARH190704018J .

Jovanović-Medojević, Milica, Pelemiš, Martina, Nešković, Jelena, Popović-Bajić, Marijana, Stratimirović, Đorđe, Živković, Slavoljub, "Analysis of working surface in new manual and rotary endodontic instruments (scanning electron microscopy)" in Srpski arhiv za celokupno lekarstvo, 148, no. 7-8 (2020):398-403,
https://doi.org/10.2298/SARH190704018J . .