TY  - JOUR
AU  - Zelic, Ksenija
AU  - Milovanović, Petar
AU  - Rakočević, Zlatko Lj.
AU  - Aškrabić, Sonja
AU  - Potočnik, Jelena
AU  - Popovic, Miroslav
AU  - Đurić, Marija
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5962
AB  - Objective. Increased tooth fragility after devitalization is commonly observed but there is no definite mechanistic explanation for such phenomenon. Therefore, it is important to analyze more profoundly structural and compositional properties of this altered form of dentin. The present study investigates the differences between normal and devitalized dentin using advanced techniques. Methods. Atomic force microscopic imaging (AFM), energy dispersive X-ray analysis (EDX) and micro-Raman spectroscopy were performed on 16 dentin specimens, eight vital and eight that underwent root-canal treatment at least two years before extraction and had no infection in root canals before or after devitalization. Results. The mean size of mineral crystals showed by AFM was larger in devitalized than in healthy dentin in the same age category. AFM phase shifts in devitalized cases revealed altered mechanical characteristics and suggested differences in composition of material between devitalized teeth and healthy controls. No significant difference in Ca/P ratio between vital and devitalized teeth was found using EDX. However, micro-Raman analyses showed that in devitalized teeth, apart from hydroxyapatite, dentin contained significant amounts of apatite phases with lower calcium content: octacalcium phosphate, dicalcium phosphate dihydrate and tricalcium phosphate. Significance. Differences between vital and devitalized dentin bring new insights into the basis of devitalized tooth fragility. Larger mineral crystals could account for decreased mechanical strength in devitalized teeth. Moreover, calcium-phosphate phases with lower Ca content have lower material strength, and the presence of these phases in devitalized teeth may explain their increased fragility. (C) 2014 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
T2  - Dental Materials
T1  - Nano-structural and compositional basis of devitalized tooth fragility
VL  - 30
IS  - 5
SP  - 476
EP  - 486
DO  - 10.1016/j.dental.2014.01.014
ER  - 

@article{
author = "Zelic, Ksenija and Milovanović, Petar and Rakočević, Zlatko Lj. and Aškrabić, Sonja and Potočnik, Jelena and Popovic, Miroslav and Đurić, Marija",
year = "2014",
abstract = "Objective. Increased tooth fragility after devitalization is commonly observed but there is no definite mechanistic explanation for such phenomenon. Therefore, it is important to analyze more profoundly structural and compositional properties of this altered form of dentin. The present study investigates the differences between normal and devitalized dentin using advanced techniques. Methods. Atomic force microscopic imaging (AFM), energy dispersive X-ray analysis (EDX) and micro-Raman spectroscopy were performed on 16 dentin specimens, eight vital and eight that underwent root-canal treatment at least two years before extraction and had no infection in root canals before or after devitalization. Results. The mean size of mineral crystals showed by AFM was larger in devitalized than in healthy dentin in the same age category. AFM phase shifts in devitalized cases revealed altered mechanical characteristics and suggested differences in composition of material between devitalized teeth and healthy controls. No significant difference in Ca/P ratio between vital and devitalized teeth was found using EDX. However, micro-Raman analyses showed that in devitalized teeth, apart from hydroxyapatite, dentin contained significant amounts of apatite phases with lower calcium content: octacalcium phosphate, dicalcium phosphate dihydrate and tricalcium phosphate. Significance. Differences between vital and devitalized dentin bring new insights into the basis of devitalized tooth fragility. Larger mineral crystals could account for decreased mechanical strength in devitalized teeth. Moreover, calcium-phosphate phases with lower Ca content have lower material strength, and the presence of these phases in devitalized teeth may explain their increased fragility. (C) 2014 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.",
journal = "Dental Materials",
title = "Nano-structural and compositional basis of devitalized tooth fragility",
volume = "30",
number = "5",
pages = "476-486",
doi = "10.1016/j.dental.2014.01.014"
}

Zelic, K., Milovanović, P., Rakočević, Z. Lj., Aškrabić, S., Potočnik, J., Popovic, M.,& Đurić, M.. (2014). Nano-structural and compositional basis of devitalized tooth fragility. in Dental Materials, 30(5), 476-486.
https://doi.org/10.1016/j.dental.2014.01.014

Zelic K, Milovanović P, Rakočević ZL, Aškrabić S, Potočnik J, Popovic M, Đurić M. Nano-structural and compositional basis of devitalized tooth fragility. in Dental Materials. 2014;30(5):476-486.
doi:10.1016/j.dental.2014.01.014 .

Zelic, Ksenija, Milovanović, Petar, Rakočević, Zlatko Lj., Aškrabić, Sonja, Potočnik, Jelena, Popovic, Miroslav, Đurić, Marija, "Nano-structural and compositional basis of devitalized tooth fragility" in Dental Materials, 30, no. 5 (2014):476-486,
https://doi.org/10.1016/j.dental.2014.01.014 . .

TY  - JOUR
AU  - Brajkovic, Denis
AU  - Antonijević, Đorđe
AU  - Milovanović, Petar
AU  - Kisić, Danilo
AU  - Zelic, Ksenija
AU  - Đurić, Marija
AU  - Rakočević, Zlatko Lj.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6071
AB  - Background: Material surface free energy and surface roughness strongly influence the bacterial adhesion in oral cavity. The aim of this study was to analyze these two parameters in various commercial luting agents used for cementation of implant restorations. Materials and methods: Zinc-based, glass-ionomers, resin modified glass-ionomer and resin-cements were investigated. Contact angle and surface free energy were measured by contact angle analyzer using Image J software program. Materials average roughness and fractal dimension were calculated based on Atomic Force Microscope topography images. Results: Zinc phosphate cements presented significantly higher total surface free energy and significantly lower dispersive component of surface free energy compared to other groups, while resin-cements showed significantly lower polar component than other groups. The surface roughness and fractal dimension values were statistically the highest in the zinc phosphate cements and the lowest for the glass-ionomers cements. Conclusion: Glass-ionomers-cements presented lower values of surface free energy and surface roughness than zinc phosphate and resin cements, indicating that their surfaces are less prone to biofilm adhesion. Practical implications: Within limitations of an in vitro trial, our results indicate that glass-ionomers-cements could be the cements of choice for fixation of cement retained implant restorations due to superior surface properties compared to zinc phosphate and resin cements, which may result in reduced plaque formation and presumably prevent periimplant infection. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Surface characterization of the cement for retention of implant supported dental prostheses: In vitro evaluation of cement roughness and surface free energy
VL  - 311
SP  - 131
EP  - 138
DO  - 10.1016/j.apsusc.2014.05.027
ER  - 

@article{
author = "Brajkovic, Denis and Antonijević, Đorđe and Milovanović, Petar and Kisić, Danilo and Zelic, Ksenija and Đurić, Marija and Rakočević, Zlatko Lj.",
year = "2014",
abstract = "Background: Material surface free energy and surface roughness strongly influence the bacterial adhesion in oral cavity. The aim of this study was to analyze these two parameters in various commercial luting agents used for cementation of implant restorations. Materials and methods: Zinc-based, glass-ionomers, resin modified glass-ionomer and resin-cements were investigated. Contact angle and surface free energy were measured by contact angle analyzer using Image J software program. Materials average roughness and fractal dimension were calculated based on Atomic Force Microscope topography images. Results: Zinc phosphate cements presented significantly higher total surface free energy and significantly lower dispersive component of surface free energy compared to other groups, while resin-cements showed significantly lower polar component than other groups. The surface roughness and fractal dimension values were statistically the highest in the zinc phosphate cements and the lowest for the glass-ionomers cements. Conclusion: Glass-ionomers-cements presented lower values of surface free energy and surface roughness than zinc phosphate and resin cements, indicating that their surfaces are less prone to biofilm adhesion. Practical implications: Within limitations of an in vitro trial, our results indicate that glass-ionomers-cements could be the cements of choice for fixation of cement retained implant restorations due to superior surface properties compared to zinc phosphate and resin cements, which may result in reduced plaque formation and presumably prevent periimplant infection. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Surface characterization of the cement for retention of implant supported dental prostheses: In vitro evaluation of cement roughness and surface free energy",
volume = "311",
pages = "131-138",
doi = "10.1016/j.apsusc.2014.05.027"
}

Brajkovic, D., Antonijević, Đ., Milovanović, P., Kisić, D., Zelic, K., Đurić, M.,& Rakočević, Z. Lj.. (2014). Surface characterization of the cement for retention of implant supported dental prostheses: In vitro evaluation of cement roughness and surface free energy. in Applied Surface Science, 311, 131-138.
https://doi.org/10.1016/j.apsusc.2014.05.027

Brajkovic D, Antonijević Đ, Milovanović P, Kisić D, Zelic K, Đurić M, Rakočević ZL. Surface characterization of the cement for retention of implant supported dental prostheses: In vitro evaluation of cement roughness and surface free energy. in Applied Surface Science. 2014;311:131-138.
doi:10.1016/j.apsusc.2014.05.027 .

Brajkovic, Denis, Antonijević, Đorđe, Milovanović, Petar, Kisić, Danilo, Zelic, Ksenija, Đurić, Marija, Rakočević, Zlatko Lj., "Surface characterization of the cement for retention of implant supported dental prostheses: In vitro evaluation of cement roughness and surface free energy" in Applied Surface Science, 311 (2014):131-138,
https://doi.org/10.1016/j.apsusc.2014.05.027 . .

TY  - JOUR
AU  - Zelic, Ksenija
AU  - Djonic, Danijela
AU  - Nešković, Olivera M.
AU  - Stoiljković, Milovan
AU  - Nikolic, Slobodan
AU  - Živković, Vladimir
AU  - Đurić, Marija
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5654
AB  - In 2011, small mass grave with completely skeletonized remains was discovered in Belgrade suburb. An eyewitness claimed that skeletons belonged to German soldiers killed in WWII. Anthropologists were engaged to investigate whether the skeletal remains correspond to the indicated German group or represent more recent case requiring court trial. Numerous dental restorations were noticed. Owing to the fact that different dental materials were used in dental practice at certain times, the aim of this study was to explore whether analysis of dental restorations could help in identification and estimation of time since death. Inductively coupled plasma optical emission spectrometry revealed that dental fillings corresponded to copper amalgam, conventional silver amalgam, silicophosphate cement, and zinc phosphate cement. Chemical results combined with anthropological and historical facts suggest that the individuals lived before the 1960s in country with well-developed dental service at that time. Therefore, chemical analysis of dental fillings was useful to distinguish between skeletal remains that are too old to be of forensic interest and the remains relevant to legal investigations.
T2  - Journal of Forensic Sciences
T1  - Forensic or Archaeological Issue: Is Chemical Analysis of Dental Restorations Helpful in Assessing Time Since Death and Identification of Skeletonized Human Remains?
VL  - 58
IS  - 5
SP  - 1284
EP  - 1288
DO  - 10.1111/1556-4029.12228
ER  - 

@article{
author = "Zelic, Ksenija and Djonic, Danijela and Nešković, Olivera M. and Stoiljković, Milovan and Nikolic, Slobodan and Živković, Vladimir and Đurić, Marija",
year = "2013",
abstract = "In 2011, small mass grave with completely skeletonized remains was discovered in Belgrade suburb. An eyewitness claimed that skeletons belonged to German soldiers killed in WWII. Anthropologists were engaged to investigate whether the skeletal remains correspond to the indicated German group or represent more recent case requiring court trial. Numerous dental restorations were noticed. Owing to the fact that different dental materials were used in dental practice at certain times, the aim of this study was to explore whether analysis of dental restorations could help in identification and estimation of time since death. Inductively coupled plasma optical emission spectrometry revealed that dental fillings corresponded to copper amalgam, conventional silver amalgam, silicophosphate cement, and zinc phosphate cement. Chemical results combined with anthropological and historical facts suggest that the individuals lived before the 1960s in country with well-developed dental service at that time. Therefore, chemical analysis of dental fillings was useful to distinguish between skeletal remains that are too old to be of forensic interest and the remains relevant to legal investigations.",
journal = "Journal of Forensic Sciences",
title = "Forensic or Archaeological Issue: Is Chemical Analysis of Dental Restorations Helpful in Assessing Time Since Death and Identification of Skeletonized Human Remains?",
volume = "58",
number = "5",
pages = "1284-1288",
doi = "10.1111/1556-4029.12228"
}

Zelic, K., Djonic, D., Nešković, O. M., Stoiljković, M., Nikolic, S., Živković, V.,& Đurić, M.. (2013). Forensic or Archaeological Issue: Is Chemical Analysis of Dental Restorations Helpful in Assessing Time Since Death and Identification of Skeletonized Human Remains?. in Journal of Forensic Sciences, 58(5), 1284-1288.
https://doi.org/10.1111/1556-4029.12228

Zelic K, Djonic D, Nešković OM, Stoiljković M, Nikolic S, Živković V, Đurić M. Forensic or Archaeological Issue: Is Chemical Analysis of Dental Restorations Helpful in Assessing Time Since Death and Identification of Skeletonized Human Remains?. in Journal of Forensic Sciences. 2013;58(5):1284-1288.
doi:10.1111/1556-4029.12228 .

Zelic, Ksenija, Djonic, Danijela, Nešković, Olivera M., Stoiljković, Milovan, Nikolic, Slobodan, Živković, Vladimir, Đurić, Marija, "Forensic or Archaeological Issue: Is Chemical Analysis of Dental Restorations Helpful in Assessing Time Since Death and Identification of Skeletonized Human Remains?" in Journal of Forensic Sciences, 58, no. 5 (2013):1284-1288,
https://doi.org/10.1111/1556-4029.12228 . .