TY  - JOUR
AU  - Mladenović, Nataša N.
AU  - Ivanović, Marija 
AU  - Kljajević, Ljiljana
AU  - Nenadović, Snežana S.
AU  - Gulicovski, Jelena J.
AU  - Pavlović, Vera P.
AU  - Trivuna, Katarina V.
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2773
AB  - Za uklanjanje jona kadmijuma iz otpadnih voda korišćeni su alumosilikatni polimeri (geopolimeri) na bazi metakaolina kao prekursora i alkalni aktivator različitih koncentracija (2M, 4M, 6M i 8M NaOH/ Na2SiO3). Eksperimenti su vršeni u šaržnom procesu na sobnoj temperaturi (23±1 °C) pri različitim radnim parametrima: vreme adsorpcije, pH vrednost rastvora, početna koncentracija metala i masa adsorbenata. Utvrđeno je da je optimalna pH vrednost za sve adsorbente iznad 6,0. Efikasnost adsorpcije raste sa porastom pH vrednosti rastvora. Sa povećanjem početne koncentracije kadmijuma raste adsorpcioni kapacitet i dostiže vrednost preko 200,0 mg/g. Ekperimentalni rezultati su pokazali dobro slaganje sa Freundlich-ovom adsorpcionom izotermom i modelom pseudo-drugog reda. Karakterizacija geopolimera urađena je pomoću rendgenske difrakcije (XRD), skenirajuće elektronske mikroskopije (SEM) i infracrvene spektroskopije sa Furijeovom transformacijom (FTIR).
AB  - Alumosilicate polymers (geopolymers) based on metakaolin as precursor and alkaline activators of different concentrations (2M, 4M, 6M and 8M NaOH/Na2SiO3) were used to remove ions of cadmium from wastewater. Experiments were carried out in a batch process at room temperature (23 ± 1 ° C) for different operating parameters: adsorption time, pH value of solution, initial concentration of metal and mass of adsorbents. It was found that the optimum pH value for all adsorbents is above 6.0. The adsorption efficiency increases with increasing pH of the solution. With an increase in the initial concentration of cadmium, the adsorption capacity increases and reaches a value of over 200.0 mg/g. The experimental results have better agreement with Freundlich's adsorption isotherm (surface heterogeneity, hemisorption mechanism) and the pseudo-second order model (the principle of the chemisorption mechanism and adsorption rate depend on the adsorbent concentration). Alumosilicate geopolymer samples were characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourier-Transform Infrared Spectroscopy (FTIR).
PB  - Savez inženjera i tehničara Srbije, Beograd
T2  - Tehnika
T1  - Primena alumosilikatnih polimera na bazi metakaolina u adsorpciji jona kadmijuma iz otpadnih voda
T1  - Application of alumosilicate polymers based on metakaolin in adsorption of cadmium ions from wastewater
EP  - 756
IS  - 6
SP  - 749
VL  - 73
DO  - 10.5937/tehnika1806749M
ER  - 

@article{
author = "Mladenović, Nataša N. and Ivanović, Marija  and Kljajević, Ljiljana and Nenadović, Snežana S. and Gulicovski, Jelena J. and Pavlović, Vera P. and Trivuna, Katarina V.",
year = "2018",
abstract = "Za uklanjanje jona kadmijuma iz otpadnih voda korišćeni su alumosilikatni polimeri (geopolimeri) na bazi metakaolina kao prekursora i alkalni aktivator različitih koncentracija (2M, 4M, 6M i 8M NaOH/ Na2SiO3). Eksperimenti su vršeni u šaržnom procesu na sobnoj temperaturi (23±1 °C) pri različitim radnim parametrima: vreme adsorpcije, pH vrednost rastvora, početna koncentracija metala i masa adsorbenata. Utvrđeno je da je optimalna pH vrednost za sve adsorbente iznad 6,0. Efikasnost adsorpcije raste sa porastom pH vrednosti rastvora. Sa povećanjem početne koncentracije kadmijuma raste adsorpcioni kapacitet i dostiže vrednost preko 200,0 mg/g. Ekperimentalni rezultati su pokazali dobro slaganje sa Freundlich-ovom adsorpcionom izotermom i modelom pseudo-drugog reda. Karakterizacija geopolimera urađena je pomoću rendgenske difrakcije (XRD), skenirajuće elektronske mikroskopije (SEM) i infracrvene spektroskopije sa Furijeovom transformacijom (FTIR)., Alumosilicate polymers (geopolymers) based on metakaolin as precursor and alkaline activators of different concentrations (2M, 4M, 6M and 8M NaOH/Na2SiO3) were used to remove ions of cadmium from wastewater. Experiments were carried out in a batch process at room temperature (23 ± 1 ° C) for different operating parameters: adsorption time, pH value of solution, initial concentration of metal and mass of adsorbents. It was found that the optimum pH value for all adsorbents is above 6.0. The adsorption efficiency increases with increasing pH of the solution. With an increase in the initial concentration of cadmium, the adsorption capacity increases and reaches a value of over 200.0 mg/g. The experimental results have better agreement with Freundlich's adsorption isotherm (surface heterogeneity, hemisorption mechanism) and the pseudo-second order model (the principle of the chemisorption mechanism and adsorption rate depend on the adsorbent concentration). Alumosilicate geopolymer samples were characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourier-Transform Infrared Spectroscopy (FTIR).",
publisher = "Savez inženjera i tehničara Srbije, Beograd",
journal = "Tehnika",
title = "Primena alumosilikatnih polimera na bazi metakaolina u adsorpciji jona kadmijuma iz otpadnih voda, Application of alumosilicate polymers based on metakaolin in adsorption of cadmium ions from wastewater",
pages = "756-749",
number = "6",
volume = "73",
doi = "10.5937/tehnika1806749M"
}

Mladenović, N. N., Ivanović, M., Kljajević, L., Nenadović, S. S., Gulicovski, J. J., Pavlović, V. P.,& Trivuna, K. V.. (2018). Primena alumosilikatnih polimera na bazi metakaolina u adsorpciji jona kadmijuma iz otpadnih voda. in Tehnika
Savez inženjera i tehničara Srbije, Beograd., 73(6), 749-756.
https://doi.org/10.5937/tehnika1806749M

Mladenović NN, Ivanović M, Kljajević L, Nenadović SS, Gulicovski JJ, Pavlović VP, Trivuna KV. Primena alumosilikatnih polimera na bazi metakaolina u adsorpciji jona kadmijuma iz otpadnih voda. in Tehnika. 2018;73(6):749-756.
doi:10.5937/tehnika1806749M .

Mladenović, Nataša N., Ivanović, Marija , Kljajević, Ljiljana, Nenadović, Snežana S., Gulicovski, Jelena J., Pavlović, Vera P., Trivuna, Katarina V., "Primena alumosilikatnih polimera na bazi metakaolina u adsorpciji jona kadmijuma iz otpadnih voda" in Tehnika, 73, no. 6 (2018):749-756,
https://doi.org/10.5937/tehnika1806749M . .

TY  - JOUR
AU  - Miletić, Vesna
AU  - Perić, Dejan
AU  - Milošević, Miloš
AU  - Manojlović, Dragica
AU  - Mitrović, Nenad
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2457
AB  - Objective. To compare strain and displacement of sculptable bulk-fill, low-shrinkage and conventional composites as well as dye penetration along the dentin-restoration interface. Methods. Modified Class II cavities (N= 5/group) were filled with sculptable bulk-fill (Filtek Bulk Fill Posterior, 3M ESPE; Tetric EvoCeram Bulk Fill, Ivoclar Vivadent; fiber-reinforced EverX Posterior, GC; giomer Beautifil Bulk, Schofu), low-shrinkage (Kalore, GC), nanohybrid (Tetric EvoCeram, Ivoclar Vivadent) or microhybrid (Filtek Z250, 3M ESPE) composites. Strain and displacement were determined using the 3D digital image correlation method based on two cameras with 1 mu m displacement sensitivity and 1600 x 1200 pixel resolution (Aramis, GOM). Microleakage along dentin axial and gingival cavity walls was measured under a stereomicroscope using a different set of teeth (N = 8/group). Data were analyzed using analyses of variance with Tukey's post-test, Pearson correlation and paired t-test (alpha = 0.05). Results. Strain of TEC Bulk, Filtek Bulk, Beautifil Bulk and Kalore was in the range of 1-1.5%. EverX and control composites showed 1.5-2% strain. Axial displacements were between 5 mu m and 30 mu m The least strain was identified at 2 mm below the occlusal surface in 4-mm but not in 2-mm layered composites. Greater microleakage occurred along the gingival than axial wall (p  lt  0.05). No correlation was found between strain/displacements and microleakage axially (r(2) = 0.082, p = 0.821; r(2) =-0.2, p = 0.605, respectively) or gingivally (r(2) =-0.126, p = 0.729, r(2) =-0.278, p = 0.469, respectively). Significance. Strain i.e. volumetric shrinkage of sculptable bulk-fill and low-shrinkage composites was comparable to control composites but strain distribution across restoration depth differed. Marginal integrity was more compromised along the gingival than axial dentin wall.
PB  - Elsevier Sci Ltd, Oxford
T2  - Dental Materials
T1  - Local deformation fields and marginal integrity of sculptable bulk-fill, low-shrinkage and conventional composites
EP  - 1451
IS  - 11
SP  - 1441
VL  - 32
DO  - 10.1016/j.dental.2016.09.011
ER  - 

@article{
author = "Miletić, Vesna and Perić, Dejan and Milošević, Miloš and Manojlović, Dragica and Mitrović, Nenad",
year = "2016",
abstract = "Objective. To compare strain and displacement of sculptable bulk-fill, low-shrinkage and conventional composites as well as dye penetration along the dentin-restoration interface. Methods. Modified Class II cavities (N= 5/group) were filled with sculptable bulk-fill (Filtek Bulk Fill Posterior, 3M ESPE; Tetric EvoCeram Bulk Fill, Ivoclar Vivadent; fiber-reinforced EverX Posterior, GC; giomer Beautifil Bulk, Schofu), low-shrinkage (Kalore, GC), nanohybrid (Tetric EvoCeram, Ivoclar Vivadent) or microhybrid (Filtek Z250, 3M ESPE) composites. Strain and displacement were determined using the 3D digital image correlation method based on two cameras with 1 mu m displacement sensitivity and 1600 x 1200 pixel resolution (Aramis, GOM). Microleakage along dentin axial and gingival cavity walls was measured under a stereomicroscope using a different set of teeth (N = 8/group). Data were analyzed using analyses of variance with Tukey's post-test, Pearson correlation and paired t-test (alpha = 0.05). Results. Strain of TEC Bulk, Filtek Bulk, Beautifil Bulk and Kalore was in the range of 1-1.5%. EverX and control composites showed 1.5-2% strain. Axial displacements were between 5 mu m and 30 mu m The least strain was identified at 2 mm below the occlusal surface in 4-mm but not in 2-mm layered composites. Greater microleakage occurred along the gingival than axial wall (p  lt  0.05). No correlation was found between strain/displacements and microleakage axially (r(2) = 0.082, p = 0.821; r(2) =-0.2, p = 0.605, respectively) or gingivally (r(2) =-0.126, p = 0.729, r(2) =-0.278, p = 0.469, respectively). Significance. Strain i.e. volumetric shrinkage of sculptable bulk-fill and low-shrinkage composites was comparable to control composites but strain distribution across restoration depth differed. Marginal integrity was more compromised along the gingival than axial dentin wall.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Dental Materials",
title = "Local deformation fields and marginal integrity of sculptable bulk-fill, low-shrinkage and conventional composites",
pages = "1451-1441",
number = "11",
volume = "32",
doi = "10.1016/j.dental.2016.09.011"
}

Miletić, V., Perić, D., Milošević, M., Manojlović, D.,& Mitrović, N.. (2016). Local deformation fields and marginal integrity of sculptable bulk-fill, low-shrinkage and conventional composites. in Dental Materials
Elsevier Sci Ltd, Oxford., 32(11), 1441-1451.
https://doi.org/10.1016/j.dental.2016.09.011

Miletić V, Perić D, Milošević M, Manojlović D, Mitrović N. Local deformation fields and marginal integrity of sculptable bulk-fill, low-shrinkage and conventional composites. in Dental Materials. 2016;32(11):1441-1451.
doi:10.1016/j.dental.2016.09.011 .

Miletić, Vesna, Perić, Dejan, Milošević, Miloš, Manojlović, Dragica, Mitrović, Nenad, "Local deformation fields and marginal integrity of sculptable bulk-fill, low-shrinkage and conventional composites" in Dental Materials, 32, no. 11 (2016):1441-1451,
https://doi.org/10.1016/j.dental.2016.09.011 . .

TY  - JOUR
AU  - Manojlović, Dragica
AU  - Dramićanin, Miroslav 
AU  - Milošević, Miloš
AU  - Zeković, Ivana
AU  - Cvijović-Alagić, Ivana
AU  - Mitrović, Nenad
AU  - Miletić, Vesna
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2420
AB  - This study investigated the degree of conversion, depth of cure, Vickers hardness, flexural strength, flexural modulus and volumetric shrinkage of experimental composite containing a low shrinkage monomer FIT-852 (FIT; Esstech Inc.) and photoinitiator 2,4,6-trimethylbenzoyldiphenylphosphine oxide (TPO; Sigma Aldrich) compared to conventional composite containing Bisphenol A-glycidyl methacrylate (BisGMA) and camphorquinone-amine photoinitiator system. The degree of conversion was generally higher in FIT-based composites (45-64% range) than in BisGMA-based composites (34-58% range). Vickers hardness, flexural strength and modulus were higher in BisGMA-based composites. A polywave light-curing unit was generally more efficient in terms of conversion and hardness of experimental composites than a monowave unit. FIT-based composite containing TPO showed the depth of cure below 2 mm irrespective of the curing light. The depth of cure of FIT-based composite containing CQ and BisGMA-based composites with either photoinitiator was in the range of 2.8-3.0 mm. Volumetric shrinkage of FIT-based composite (0.9-5.7% range) was lower than that of BisGMA-based composite (2.2-12% range). FIT may be used as a shrinkage reducing monomer compatible with the conventional CQ-amine system as well as the alternative TPO photoinitiator. However, the depth of cure of FIT_TPO composite requires boosting to achieve clinically recommended thickness of 2 mm.
PB  - Elsevier, Amsterdam
T2  - Materials Science & Engineering C-Materials For Biological Applications
T1  - Effects of a low-Shrinkage methacrylate monomer and monoacylphosphine oxide photoinitiator on curing efficiency and mechanical properties of experimental resin-based composites
EP  - 494
SP  - 487
VL  - 58
DO  - 10.1016/j.msec.2015.08.054
ER  - 

@article{
author = "Manojlović, Dragica and Dramićanin, Miroslav  and Milošević, Miloš and Zeković, Ivana and Cvijović-Alagić, Ivana and Mitrović, Nenad and Miletić, Vesna",
year = "2016",
abstract = "This study investigated the degree of conversion, depth of cure, Vickers hardness, flexural strength, flexural modulus and volumetric shrinkage of experimental composite containing a low shrinkage monomer FIT-852 (FIT; Esstech Inc.) and photoinitiator 2,4,6-trimethylbenzoyldiphenylphosphine oxide (TPO; Sigma Aldrich) compared to conventional composite containing Bisphenol A-glycidyl methacrylate (BisGMA) and camphorquinone-amine photoinitiator system. The degree of conversion was generally higher in FIT-based composites (45-64% range) than in BisGMA-based composites (34-58% range). Vickers hardness, flexural strength and modulus were higher in BisGMA-based composites. A polywave light-curing unit was generally more efficient in terms of conversion and hardness of experimental composites than a monowave unit. FIT-based composite containing TPO showed the depth of cure below 2 mm irrespective of the curing light. The depth of cure of FIT-based composite containing CQ and BisGMA-based composites with either photoinitiator was in the range of 2.8-3.0 mm. Volumetric shrinkage of FIT-based composite (0.9-5.7% range) was lower than that of BisGMA-based composite (2.2-12% range). FIT may be used as a shrinkage reducing monomer compatible with the conventional CQ-amine system as well as the alternative TPO photoinitiator. However, the depth of cure of FIT_TPO composite requires boosting to achieve clinically recommended thickness of 2 mm.",
publisher = "Elsevier, Amsterdam",
journal = "Materials Science & Engineering C-Materials For Biological Applications",
title = "Effects of a low-Shrinkage methacrylate monomer and monoacylphosphine oxide photoinitiator on curing efficiency and mechanical properties of experimental resin-based composites",
pages = "494-487",
volume = "58",
doi = "10.1016/j.msec.2015.08.054"
}

Manojlović, D., Dramićanin, M., Milošević, M., Zeković, I., Cvijović-Alagić, I., Mitrović, N.,& Miletić, V.. (2016). Effects of a low-Shrinkage methacrylate monomer and monoacylphosphine oxide photoinitiator on curing efficiency and mechanical properties of experimental resin-based composites. in Materials Science & Engineering C-Materials For Biological Applications
Elsevier, Amsterdam., 58, 487-494.
https://doi.org/10.1016/j.msec.2015.08.054

Manojlović D, Dramićanin M, Milošević M, Zeković I, Cvijović-Alagić I, Mitrović N, Miletić V. Effects of a low-Shrinkage methacrylate monomer and monoacylphosphine oxide photoinitiator on curing efficiency and mechanical properties of experimental resin-based composites. in Materials Science & Engineering C-Materials For Biological Applications. 2016;58:487-494.
doi:10.1016/j.msec.2015.08.054 .

Manojlović, Dragica, Dramićanin, Miroslav , Milošević, Miloš, Zeković, Ivana, Cvijović-Alagić, Ivana, Mitrović, Nenad, Miletić, Vesna, "Effects of a low-Shrinkage methacrylate monomer and monoacylphosphine oxide photoinitiator on curing efficiency and mechanical properties of experimental resin-based composites" in Materials Science & Engineering C-Materials For Biological Applications, 58 (2016):487-494,
https://doi.org/10.1016/j.msec.2015.08.054 . .

TY  - JOUR
AU  - Lezaja, Maja
AU  - Veljović, Đorđe
AU  - Manojlović, Dragica
AU  - Milošević, Miloš
AU  - Mitrović, Nenad
AU  - Janaćković, Đorđe
AU  - Miletić, Vesna
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2215
AB  - Objective. To determine the shear bond strength (SBS) between synthetic controlled porous hydroxyapatite (HAP) inserts and restorative materials and dimensional changes of insert-containing restorations during curing. Methods. Cylinder-shaped HAP inserts (4 mm in diameter, 1.6 mm thick) were cemented in dentin discs (5 mm x 1.6 mm), cut mid-coronally from human third molars, using one of the following materials: universal microhybrid composite Filtek Z250, flowable composite Filtek Ultimate or glass-ionomer Vitrebond (all 3M ESPE). SBS of the same materials to HAP inserts was tested in a universal testing machine. Three-dimensional digital image correlation system Aramis (GOM) was used to measure strains and displacements. Data were statistically analyzed using one-way ANOVA with Tukey's post-test (alpha = 0.05). Results. SBS of restorative materials to HAP inserts ranged between 12.2 +/- 2.1 MPa (Filtek Z250) and 0.7 +/- 0.4 MPa (Filtek Z250 without an adhesive). The 'total-etch' approach of adhesive application significantly increased SBS of both Filtek Z250 (12.2 +/- 2.1 MPa) and Filtek Ultimate flowable (9.5 +/- 2.5 MPa) compared to the 'self-etch' approach (8.2 +/- 1.6 MPa and 4.4 +/- 0.9 MPa, respectively) (p  lt  0.05). HAP inserts reduced polymerization shrinkage to below 0.5% as well as displacements in the central region of the restorations. Peripheral shrinkage of restorative materials was similar with and without HAP inserts as were displacements of Filtek Z250 and Vitrebond. Significance. Replacing major part of dentin clinically, especially in large cavities, HAP inserts may shorten clinical working time, improve dimensional stability of the restoration by reducing central shrinkage and displacements and provide adhesive bonding to universal composites following a 'total-etch' approach.
PB  - Elsevier Sci Ltd, Oxford
T2  - Dental Materials
T1  - Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization
EP  - 181
IS  - 2
SP  - 171
VL  - 31
DO  - 10.1016/j.dental.2014.11.017
ER  - 

@article{
author = "Lezaja, Maja and Veljović, Đorđe and Manojlović, Dragica and Milošević, Miloš and Mitrović, Nenad and Janaćković, Đorđe and Miletić, Vesna",
year = "2015",
abstract = "Objective. To determine the shear bond strength (SBS) between synthetic controlled porous hydroxyapatite (HAP) inserts and restorative materials and dimensional changes of insert-containing restorations during curing. Methods. Cylinder-shaped HAP inserts (4 mm in diameter, 1.6 mm thick) were cemented in dentin discs (5 mm x 1.6 mm), cut mid-coronally from human third molars, using one of the following materials: universal microhybrid composite Filtek Z250, flowable composite Filtek Ultimate or glass-ionomer Vitrebond (all 3M ESPE). SBS of the same materials to HAP inserts was tested in a universal testing machine. Three-dimensional digital image correlation system Aramis (GOM) was used to measure strains and displacements. Data were statistically analyzed using one-way ANOVA with Tukey's post-test (alpha = 0.05). Results. SBS of restorative materials to HAP inserts ranged between 12.2 +/- 2.1 MPa (Filtek Z250) and 0.7 +/- 0.4 MPa (Filtek Z250 without an adhesive). The 'total-etch' approach of adhesive application significantly increased SBS of both Filtek Z250 (12.2 +/- 2.1 MPa) and Filtek Ultimate flowable (9.5 +/- 2.5 MPa) compared to the 'self-etch' approach (8.2 +/- 1.6 MPa and 4.4 +/- 0.9 MPa, respectively) (p  lt  0.05). HAP inserts reduced polymerization shrinkage to below 0.5% as well as displacements in the central region of the restorations. Peripheral shrinkage of restorative materials was similar with and without HAP inserts as were displacements of Filtek Z250 and Vitrebond. Significance. Replacing major part of dentin clinically, especially in large cavities, HAP inserts may shorten clinical working time, improve dimensional stability of the restoration by reducing central shrinkage and displacements and provide adhesive bonding to universal composites following a 'total-etch' approach.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Dental Materials",
title = "Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization",
pages = "181-171",
number = "2",
volume = "31",
doi = "10.1016/j.dental.2014.11.017"
}

Lezaja, M., Veljović, Đ., Manojlović, D., Milošević, M., Mitrović, N., Janaćković, Đ.,& Miletić, V.. (2015). Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization. in Dental Materials
Elsevier Sci Ltd, Oxford., 31(2), 171-181.
https://doi.org/10.1016/j.dental.2014.11.017

Lezaja M, Veljović Đ, Manojlović D, Milošević M, Mitrović N, Janaćković Đ, Miletić V. Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization. in Dental Materials. 2015;31(2):171-181.
doi:10.1016/j.dental.2014.11.017 .

Lezaja, Maja, Veljović, Đorđe, Manojlović, Dragica, Milošević, Miloš, Mitrović, Nenad, Janaćković, Đorđe, Miletić, Vesna, "Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization" in Dental Materials, 31, no. 2 (2015):171-181,
https://doi.org/10.1016/j.dental.2014.11.017 . .