Synthesis, processing and applications of nanostructured multifunctional materials with defined properties

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Synthesis, processing and applications of nanostructured multifunctional materials with defined properties (en)
Синтеза, развој технологија добијања и примена наноструктурних мултифункционалних материјала дефинисаних својстава (sr)
Sinteza, razvoj tehnologija dobijanja i primena nanostrukturnih multifunkcionalnih materijala definisanih svojstava (sr_RS)
Authors

Publications

Dissimilar sintered calcium phosphate dental inserts as dentine substitutes: Shear bond strength to restorative materials

Ayoub, Giuma; Ležaja-Zebić, Maja; Miletić, Vesna; Petrović, Rada; Veljović, Đorđe; Janaćković, Đorđe

(Wiley, Hoboken, 2020)

TY  - JOUR
AU  - Ayoub, Giuma
AU  - Ležaja-Zebić, Maja
AU  - Miletić, Vesna
AU  - Petrović, Rada
AU  - Veljović, Đorđe
AU  - Janaćković, Đorđe
PY  - 2020
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/1046
AB  - The application of sintered calcium phosphate dental inserts in the central part of tooth cavities can reduce amount of embedded dental composite and polymerization shrinkage of final dental fillings. The aim of this study was to analyze comparatively physico-chemical and mechanical properties of dental inserts and shear bond strength (SBS) between three dissimilar hydroxyapatite-based dental inserts and different restorative materials, after application of different clinical protocols. Starting from two different hydroxyapatite nano powders and nanostructured stabilized zirconia (YSZ), monophasic two-step sintered dense HAp inserts (TSSHAp), biphasic single-step sintered controlled porous inserts (HAp/TCp), and single-step sintered reinforced HAp/YSZ inserts were processed and characterized. Obvious differences in the microstructure of inserts surface were visualized after etching with 37% phosphoric acid. Fracture toughness of sintered inserts was ranged between 1.01 and 1.85 MPam(1/2) (maximum value in the case of HAp/YSZ), while hardness values were in the range of 3.71-5.22 GPa (maximum value in the case of TSSHAp). Acid etching before application improved SBS between inserts and Maxcem compared to direct cement application. TSSHAp and HAP/TCp inserts showed comparable and relatively high SBS values, certainly higher compared to HAp/YSZ inserts. Slightly higher SBS values were measured in the case of TSSHAp insert group, and the highest mean SBS value of 18.51 MPa was determined between TSSHAp inserts and Filtek Z250_SBU following the "self-etch" protocol.
PB  - Wiley, Hoboken
T2  - Journal of Biomedical Materials Research Part B: Applied Biomaterials
T1  - Dissimilar sintered calcium phosphate dental inserts as dentine substitutes: Shear bond strength to restorative materials
DO  - 10.1002/jbm.b.34578
ER  - 
@article{
author = "Ayoub, Giuma and Ležaja-Zebić, Maja and Miletić, Vesna and Petrović, Rada and Veljović, Đorđe and Janaćković, Đorđe",
year = "2020",
abstract = "The application of sintered calcium phosphate dental inserts in the central part of tooth cavities can reduce amount of embedded dental composite and polymerization shrinkage of final dental fillings. The aim of this study was to analyze comparatively physico-chemical and mechanical properties of dental inserts and shear bond strength (SBS) between three dissimilar hydroxyapatite-based dental inserts and different restorative materials, after application of different clinical protocols. Starting from two different hydroxyapatite nano powders and nanostructured stabilized zirconia (YSZ), monophasic two-step sintered dense HAp inserts (TSSHAp), biphasic single-step sintered controlled porous inserts (HAp/TCp), and single-step sintered reinforced HAp/YSZ inserts were processed and characterized. Obvious differences in the microstructure of inserts surface were visualized after etching with 37% phosphoric acid. Fracture toughness of sintered inserts was ranged between 1.01 and 1.85 MPam(1/2) (maximum value in the case of HAp/YSZ), while hardness values were in the range of 3.71-5.22 GPa (maximum value in the case of TSSHAp). Acid etching before application improved SBS between inserts and Maxcem compared to direct cement application. TSSHAp and HAP/TCp inserts showed comparable and relatively high SBS values, certainly higher compared to HAp/YSZ inserts. Slightly higher SBS values were measured in the case of TSSHAp insert group, and the highest mean SBS value of 18.51 MPa was determined between TSSHAp inserts and Filtek Z250_SBU following the "self-etch" protocol.",
publisher = "Wiley, Hoboken",
journal = "Journal of Biomedical Materials Research Part B: Applied Biomaterials",
title = "Dissimilar sintered calcium phosphate dental inserts as dentine substitutes: Shear bond strength to restorative materials",
doi = "10.1002/jbm.b.34578"
}
Ayoub, G., Ležaja-Zebić, M., Miletić, V., Petrović, R., Veljović, Đ.,& Janaćković, Đ.. (2020). Dissimilar sintered calcium phosphate dental inserts as dentine substitutes: Shear bond strength to restorative materials. in Journal of Biomedical Materials Research Part B: Applied Biomaterials
Wiley, Hoboken..
https://doi.org/10.1002/jbm.b.34578
Ayoub G, Ležaja-Zebić M, Miletić V, Petrović R, Veljović Đ, Janaćković Đ. Dissimilar sintered calcium phosphate dental inserts as dentine substitutes: Shear bond strength to restorative materials. in Journal of Biomedical Materials Research Part B: Applied Biomaterials. 2020;.
doi:10.1002/jbm.b.34578 .
Ayoub, Giuma, Ležaja-Zebić, Maja, Miletić, Vesna, Petrović, Rada, Veljović, Đorđe, Janaćković, Đorđe, "Dissimilar sintered calcium phosphate dental inserts as dentine substitutes: Shear bond strength to restorative materials" in Journal of Biomedical Materials Research Part B: Applied Biomaterials (2020),
https://doi.org/10.1002/jbm.b.34578 . .
3
3

Color stability of bulk-fill and universal composite restorations with dissimilar dentin replacement materials

Miletić, Vesna; Marjanović, Jovana; Veljović, Đorđe; Stasić, Jovana; Petrović, Violeta

(Wiley, Hoboken, 2019)

TY  - JOUR
AU  - Miletić, Vesna
AU  - Marjanović, Jovana
AU  - Veljović, Đorđe
AU  - Stasić, Jovana
AU  - Petrović, Violeta
PY  - 2019
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/2378
AB  - Objective To determine color changes in bulk-fill composite and universal composite restorations with dissimilar dentin replacement materials in extracted teeth after staining in red wine. Materials and Methods Cylindrical, 4 mm deep, class I cavities were prepared in 140 human molars. Bottom 2 mm was restored with Biodentine (Septodont), everX posterior (GC) or experimental HAP inserts. Each dentin replacement material was covered with a 2-mm layer of a universal composite Filtek Z250 or Z550 (3M ESPE) or Gradia Posterior (GC). Groups combining top composite layer and the underlying dentin replacement were designated as "composite_dentin replacement." Filtek Bulk Fill (3M ESPE) and Tetric EvoCeram Bulk Fill (Ivoclar Vivadent) were placed as a single 4-mm layer. Color measurements were performed using Vita Easyshade 4.0 (Vita Zahnfabrik) initially and after 48-hours storage in red wine at 37 degrees C. Results Color differences (Delta E-oo) ranged between 2.1 +/- 0.7 (Z250_HAP) and 7.8 +/- 1.1 (Z550_everX). EverX resulted in higher Delta E-oo of the overlying composite than HAP (P  lt  .001) and Biodentine (P = .006). Generally, Delta E-oo was affected more by decreasing lightness (Delta L ') than changes in chroma (Delta C '). Conclusions EverX resulted in higher Delta E-oo of the restoration than Biodentine and experimental HAP after staining in red wine. No significant differences in Delta E-oo may be expected in different composites with the same underlying dentin replacement material. The same was generally true for bulk-fill and universal composites. Clinical Significance Similar extent of color changes may be expected in bulk-fill and universal composites. Highly translucent everX might exhibit greater color differences irrespective of the capping composite than non-translucent materials. Clinicians have a wider choice of composite materials to cover a particular dentin replacement material, for example, everX or Biodentine, as similar color differences may be expected in various overlying composite brands.
PB  - Wiley, Hoboken
T2  - Journal of Esthetic & Restorative Dentistry
T1  - Color stability of bulk-fill and universal composite restorations with dissimilar dentin replacement materials
VL  - 31
IS  - 5
SP  - 520
EP  - 528
DO  - 10.1111/jerd.12529
ER  - 
@article{
author = "Miletić, Vesna and Marjanović, Jovana and Veljović, Đorđe and Stasić, Jovana and Petrović, Violeta",
year = "2019",
abstract = "Objective To determine color changes in bulk-fill composite and universal composite restorations with dissimilar dentin replacement materials in extracted teeth after staining in red wine. Materials and Methods Cylindrical, 4 mm deep, class I cavities were prepared in 140 human molars. Bottom 2 mm was restored with Biodentine (Septodont), everX posterior (GC) or experimental HAP inserts. Each dentin replacement material was covered with a 2-mm layer of a universal composite Filtek Z250 or Z550 (3M ESPE) or Gradia Posterior (GC). Groups combining top composite layer and the underlying dentin replacement were designated as "composite_dentin replacement." Filtek Bulk Fill (3M ESPE) and Tetric EvoCeram Bulk Fill (Ivoclar Vivadent) were placed as a single 4-mm layer. Color measurements were performed using Vita Easyshade 4.0 (Vita Zahnfabrik) initially and after 48-hours storage in red wine at 37 degrees C. Results Color differences (Delta E-oo) ranged between 2.1 +/- 0.7 (Z250_HAP) and 7.8 +/- 1.1 (Z550_everX). EverX resulted in higher Delta E-oo of the overlying composite than HAP (P  lt  .001) and Biodentine (P = .006). Generally, Delta E-oo was affected more by decreasing lightness (Delta L ') than changes in chroma (Delta C '). Conclusions EverX resulted in higher Delta E-oo of the restoration than Biodentine and experimental HAP after staining in red wine. No significant differences in Delta E-oo may be expected in different composites with the same underlying dentin replacement material. The same was generally true for bulk-fill and universal composites. Clinical Significance Similar extent of color changes may be expected in bulk-fill and universal composites. Highly translucent everX might exhibit greater color differences irrespective of the capping composite than non-translucent materials. Clinicians have a wider choice of composite materials to cover a particular dentin replacement material, for example, everX or Biodentine, as similar color differences may be expected in various overlying composite brands.",
publisher = "Wiley, Hoboken",
journal = "Journal of Esthetic & Restorative Dentistry",
title = "Color stability of bulk-fill and universal composite restorations with dissimilar dentin replacement materials",
volume = "31",
number = "5",
pages = "520-528",
doi = "10.1111/jerd.12529"
}
Miletić, V., Marjanović, J., Veljović, Đ., Stasić, J.,& Petrović, V.. (2019). Color stability of bulk-fill and universal composite restorations with dissimilar dentin replacement materials. in Journal of Esthetic & Restorative Dentistry
Wiley, Hoboken., 31(5), 520-528.
https://doi.org/10.1111/jerd.12529
Miletić V, Marjanović J, Veljović Đ, Stasić J, Petrović V. Color stability of bulk-fill and universal composite restorations with dissimilar dentin replacement materials. in Journal of Esthetic & Restorative Dentistry. 2019;31(5):520-528.
doi:10.1111/jerd.12529 .
Miletić, Vesna, Marjanović, Jovana, Veljović, Đorđe, Stasić, Jovana, Petrović, Violeta, "Color stability of bulk-fill and universal composite restorations with dissimilar dentin replacement materials" in Journal of Esthetic & Restorative Dentistry, 31, no. 5 (2019):520-528,
https://doi.org/10.1111/jerd.12529 . .
16
2
15

Optical properties of composite restorations influenced by dissimilar dentin restoratives

Marjanović, Jovana; Veljović, Đorđe; Stasić, Jovana; Savić-Stanković, Tatjana; Trifković, Branka; Miletić, Vesna

(Elsevier Sci Ltd, Oxford, 2018)

TY  - JOUR
AU  - Marjanović, Jovana
AU  - Veljović, Đorđe
AU  - Stasić, Jovana
AU  - Savić-Stanković, Tatjana
AU  - Trifković, Branka
AU  - Miletić, Vesna
PY  - 2018
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/2536
AB  - Objectives. To evaluate optical properties (color and translucency) of 'sandwich' restorations of resin-based composites and esthetically unfavorable dentin restoratives. Methods. Cylindrical 'dentin' specimens (8 mm in diameter and 2 mm thick, N = 5/group) were prepared using EverX Posterior (GC), Biodentine (Septodont), experimental hydroxyapatite (HAP) or conventional composites (Gradia Direct Posterior, GC; Filtek Z250 and Filtek Z500, 3M ESPE). Capping 'enamel' layers were prepared using composites (Gradia Direct Posterior, Filtek Z250 or Z550) of Al or A3 shade and the following thickness: 0.6, 1 or 2 mm. Color (Delta E) and translucency parameter (TP) were determined using a spectrophotometer (VITA Easyshade Advance 4.0, VITA Zahnfabrik). Data were statistically analyzed using analysis of variance with Tukey's post-hoc tests (alpha = 0.05). Results. TP was greatly affected by layer thickness, whilst Delta E depended on shade and layer thickness of the capping composite. HAP and Biodentine showed significantly lower TP and higher Delta E (deviation from 'ideal white') than composites (p  lt  0.05). Greater TP was seen in EverX_composite groups than in corresponding control groups of the same shade and thickness. TP of composites combined with Biodentine or HAP was below 2, lower than the corresponding control groups (p  lt  0.05). Within-group differences of Delta E were greatest in HAP_composite groups. EverX_Gradia and EverX_FiltekZ250 combinations showed the most comparable Delta E with the control groups. Significance. A 2 mm thick layer of composite covering dentin restoratives with unfavorable esthetics is recommended for a final 'sandwich' restoration that is esthetically comparable to a conventional, mono-composite control restoration.
PB  - Elsevier Sci Ltd, Oxford
T2  - Dental Materials
T1  - Optical properties of composite restorations influenced by dissimilar dentin restoratives
VL  - 34
IS  - 5
SP  - 737
EP  - 745
DO  - 10.1016/j.dental.2018.01.017
ER  - 
@article{
author = "Marjanović, Jovana and Veljović, Đorđe and Stasić, Jovana and Savić-Stanković, Tatjana and Trifković, Branka and Miletić, Vesna",
year = "2018",
abstract = "Objectives. To evaluate optical properties (color and translucency) of 'sandwich' restorations of resin-based composites and esthetically unfavorable dentin restoratives. Methods. Cylindrical 'dentin' specimens (8 mm in diameter and 2 mm thick, N = 5/group) were prepared using EverX Posterior (GC), Biodentine (Septodont), experimental hydroxyapatite (HAP) or conventional composites (Gradia Direct Posterior, GC; Filtek Z250 and Filtek Z500, 3M ESPE). Capping 'enamel' layers were prepared using composites (Gradia Direct Posterior, Filtek Z250 or Z550) of Al or A3 shade and the following thickness: 0.6, 1 or 2 mm. Color (Delta E) and translucency parameter (TP) were determined using a spectrophotometer (VITA Easyshade Advance 4.0, VITA Zahnfabrik). Data were statistically analyzed using analysis of variance with Tukey's post-hoc tests (alpha = 0.05). Results. TP was greatly affected by layer thickness, whilst Delta E depended on shade and layer thickness of the capping composite. HAP and Biodentine showed significantly lower TP and higher Delta E (deviation from 'ideal white') than composites (p  lt  0.05). Greater TP was seen in EverX_composite groups than in corresponding control groups of the same shade and thickness. TP of composites combined with Biodentine or HAP was below 2, lower than the corresponding control groups (p  lt  0.05). Within-group differences of Delta E were greatest in HAP_composite groups. EverX_Gradia and EverX_FiltekZ250 combinations showed the most comparable Delta E with the control groups. Significance. A 2 mm thick layer of composite covering dentin restoratives with unfavorable esthetics is recommended for a final 'sandwich' restoration that is esthetically comparable to a conventional, mono-composite control restoration.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Dental Materials",
title = "Optical properties of composite restorations influenced by dissimilar dentin restoratives",
volume = "34",
number = "5",
pages = "737-745",
doi = "10.1016/j.dental.2018.01.017"
}
Marjanović, J., Veljović, Đ., Stasić, J., Savić-Stanković, T., Trifković, B.,& Miletić, V.. (2018). Optical properties of composite restorations influenced by dissimilar dentin restoratives. in Dental Materials
Elsevier Sci Ltd, Oxford., 34(5), 737-745.
https://doi.org/10.1016/j.dental.2018.01.017
Marjanović J, Veljović Đ, Stasić J, Savić-Stanković T, Trifković B, Miletić V. Optical properties of composite restorations influenced by dissimilar dentin restoratives. in Dental Materials. 2018;34(5):737-745.
doi:10.1016/j.dental.2018.01.017 .
Marjanović, Jovana, Veljović, Đorđe, Stasić, Jovana, Savić-Stanković, Tatjana, Trifković, Branka, Miletić, Vesna, "Optical properties of composite restorations influenced by dissimilar dentin restoratives" in Dental Materials, 34, no. 5 (2018):737-745,
https://doi.org/10.1016/j.dental.2018.01.017 . .
24
10
19

Optical properties of composite restorations influenced by dissimilar dentin restoratives

Marjanović, Jovana; Veljović, Đorđe; Stasić, Jovana; Savić-Stanković, Tatjana; Trifković, Branka; Miletić, Vesna

(Elsevier Sci Ltd, Oxford, 2018)

TY  - JOUR
AU  - Marjanović, Jovana
AU  - Veljović, Đorđe
AU  - Stasić, Jovana
AU  - Savić-Stanković, Tatjana
AU  - Trifković, Branka
AU  - Miletić, Vesna
PY  - 2018
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/2290
AB  - Objectives. To evaluate optical properties (color and translucency) of 'sandwich' restorations of resin-based composites and esthetically unfavorable dentin restoratives. Methods. Cylindrical 'dentin' specimens (8 mm in diameter and 2 mm thick, N = 5/group) were prepared using EverX Posterior (GC), Biodentine (Septodont), experimental hydroxyapatite (HAP) or conventional composites (Gradia Direct Posterior, GC; Filtek Z250 and Filtek Z500, 3M ESPE). Capping 'enamel' layers were prepared using composites (Gradia Direct Posterior, Filtek Z250 or Z550) of Al or A3 shade and the following thickness: 0.6, 1 or 2 mm. Color (Delta E) and translucency parameter (TP) were determined using a spectrophotometer (VITA Easyshade Advance 4.0, VITA Zahnfabrik). Data were statistically analyzed using analysis of variance with Tukey's post-hoc tests (alpha = 0.05). Results. TP was greatly affected by layer thickness, whilst Delta E depended on shade and layer thickness of the capping composite. HAP and Biodentine showed significantly lower TP and higher Delta E (deviation from 'ideal white') than composites (p  lt  0.05). Greater TP was seen in EverX_composite groups than in corresponding control groups of the same shade and thickness. TP of composites combined with Biodentine or HAP was below 2, lower than the corresponding control groups (p  lt  0.05). Within-group differences of Delta E were greatest in HAP_composite groups. EverX_Gradia and EverX_FiltekZ250 combinations showed the most comparable Delta E with the control groups. Significance. A 2 mm thick layer of composite covering dentin restoratives with unfavorable esthetics is recommended for a final 'sandwich' restoration that is esthetically comparable to a conventional, mono-composite control restoration.
PB  - Elsevier Sci Ltd, Oxford
T2  - Dental Materials
T1  - Optical properties of composite restorations influenced by dissimilar dentin restoratives
VL  - 34
IS  - 5
SP  - 737
EP  - 745
DO  - 10.1016/j.dental.2018.01.017
ER  - 
@article{
author = "Marjanović, Jovana and Veljović, Đorđe and Stasić, Jovana and Savić-Stanković, Tatjana and Trifković, Branka and Miletić, Vesna",
year = "2018",
abstract = "Objectives. To evaluate optical properties (color and translucency) of 'sandwich' restorations of resin-based composites and esthetically unfavorable dentin restoratives. Methods. Cylindrical 'dentin' specimens (8 mm in diameter and 2 mm thick, N = 5/group) were prepared using EverX Posterior (GC), Biodentine (Septodont), experimental hydroxyapatite (HAP) or conventional composites (Gradia Direct Posterior, GC; Filtek Z250 and Filtek Z500, 3M ESPE). Capping 'enamel' layers were prepared using composites (Gradia Direct Posterior, Filtek Z250 or Z550) of Al or A3 shade and the following thickness: 0.6, 1 or 2 mm. Color (Delta E) and translucency parameter (TP) were determined using a spectrophotometer (VITA Easyshade Advance 4.0, VITA Zahnfabrik). Data were statistically analyzed using analysis of variance with Tukey's post-hoc tests (alpha = 0.05). Results. TP was greatly affected by layer thickness, whilst Delta E depended on shade and layer thickness of the capping composite. HAP and Biodentine showed significantly lower TP and higher Delta E (deviation from 'ideal white') than composites (p  lt  0.05). Greater TP was seen in EverX_composite groups than in corresponding control groups of the same shade and thickness. TP of composites combined with Biodentine or HAP was below 2, lower than the corresponding control groups (p  lt  0.05). Within-group differences of Delta E were greatest in HAP_composite groups. EverX_Gradia and EverX_FiltekZ250 combinations showed the most comparable Delta E with the control groups. Significance. A 2 mm thick layer of composite covering dentin restoratives with unfavorable esthetics is recommended for a final 'sandwich' restoration that is esthetically comparable to a conventional, mono-composite control restoration.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Dental Materials",
title = "Optical properties of composite restorations influenced by dissimilar dentin restoratives",
volume = "34",
number = "5",
pages = "737-745",
doi = "10.1016/j.dental.2018.01.017"
}
Marjanović, J., Veljović, Đ., Stasić, J., Savić-Stanković, T., Trifković, B.,& Miletić, V.. (2018). Optical properties of composite restorations influenced by dissimilar dentin restoratives. in Dental Materials
Elsevier Sci Ltd, Oxford., 34(5), 737-745.
https://doi.org/10.1016/j.dental.2018.01.017
Marjanović J, Veljović Đ, Stasić J, Savić-Stanković T, Trifković B, Miletić V. Optical properties of composite restorations influenced by dissimilar dentin restoratives. in Dental Materials. 2018;34(5):737-745.
doi:10.1016/j.dental.2018.01.017 .
Marjanović, Jovana, Veljović, Đorđe, Stasić, Jovana, Savić-Stanković, Tatjana, Trifković, Branka, Miletić, Vesna, "Optical properties of composite restorations influenced by dissimilar dentin restoratives" in Dental Materials, 34, no. 5 (2018):737-745,
https://doi.org/10.1016/j.dental.2018.01.017 . .
24
10
19

Composite nanostructured hydroxyapatite/yttrium stabilized zirconia dental inserts - The processing and application as dentin substitutes

Ayoub, Giuma; Veljović, Đorđe; Ležaja-Zebić, Maja; Miletić, Vesna; Palcevskis, Eriks; Petrović, Rada; Janaćković, Đorđe

(Elsevier Sci Ltd, Oxford, 2018)

TY  - JOUR
AU  - Ayoub, Giuma
AU  - Veljović, Đorđe
AU  - Ležaja-Zebić, Maja
AU  - Miletić, Vesna
AU  - Palcevskis, Eriks
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
PY  - 2018
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/2305
AB  - The objective of the study was to process nano-structured hydroxyapatite/yttrium-stabilized zirconia bioceramic and to investigate the possibilities of its application as dentin replacement in the form of dental inserts. The processing conditions were varied in order to optimize phase composition, microstructure, fracture toughness, hardness and shear bond strength (SBS) between the obtained composite inserts and restorative materials, following either the "total-etch" or "self-etch" clinical protocol. Composite nano-powder, obtained by mixing and homogenization of 80 wt% of stoichiometric hydroxyapatite (HAp) synthesized by modified precipitation method and 20wt% of yttrium-stabilized ZrO2 (YSZ) synthesized by plasma method, was isostatically pressed into cylinder-shaped green bodies. After dilatometric analysis, HAp/YSZ inserts were sintered in the temperature range from 1200 degrees C to 1300 degrees C. Hardness and fracture toughness of sintered inserts were ranged between 3.90 +/- 0.20 - 3.95 +/- 0.12 GPa and 1.82 +/- 0.04 - 1.88 +/- 0.03 MPam(1/2), respectively. Microstructural analysis of biphasic HAp/t-ZrO2 inserts indicated two potential fracture mechanisms for fracture toughness increasing. Sintering temperature and different clinical protocols affected SBS between processed inserts and commercial dental restorative materials. Maximum SBS values of 10.50 +/- 4.94 MPa (mean standard deviation) were reached in inserts sintered at 1300 degrees C, following the "self-etch" protocol of adhesive application. It could be concluded that resin-based composites could be strongly bonded to HAp/YSZ inserts, preferably with self-etch" adhesive application. In addition, the values of fracture toughness and hardness of the obtained inserts indicated the possibility of their usage as dentin substitutes, which could be a good prerequisite for satisfactory mechanics of restored teeth.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Composite nanostructured hydroxyapatite/yttrium stabilized zirconia dental inserts - The processing and application as dentin substitutes
VL  - 44
IS  - 15
SP  - 18200
EP  - 18208
DO  - 10.1016/j.ceramint.2018.07.028
ER  - 
@article{
author = "Ayoub, Giuma and Veljović, Đorđe and Ležaja-Zebić, Maja and Miletić, Vesna and Palcevskis, Eriks and Petrović, Rada and Janaćković, Đorđe",
year = "2018",
abstract = "The objective of the study was to process nano-structured hydroxyapatite/yttrium-stabilized zirconia bioceramic and to investigate the possibilities of its application as dentin replacement in the form of dental inserts. The processing conditions were varied in order to optimize phase composition, microstructure, fracture toughness, hardness and shear bond strength (SBS) between the obtained composite inserts and restorative materials, following either the "total-etch" or "self-etch" clinical protocol. Composite nano-powder, obtained by mixing and homogenization of 80 wt% of stoichiometric hydroxyapatite (HAp) synthesized by modified precipitation method and 20wt% of yttrium-stabilized ZrO2 (YSZ) synthesized by plasma method, was isostatically pressed into cylinder-shaped green bodies. After dilatometric analysis, HAp/YSZ inserts were sintered in the temperature range from 1200 degrees C to 1300 degrees C. Hardness and fracture toughness of sintered inserts were ranged between 3.90 +/- 0.20 - 3.95 +/- 0.12 GPa and 1.82 +/- 0.04 - 1.88 +/- 0.03 MPam(1/2), respectively. Microstructural analysis of biphasic HAp/t-ZrO2 inserts indicated two potential fracture mechanisms for fracture toughness increasing. Sintering temperature and different clinical protocols affected SBS between processed inserts and commercial dental restorative materials. Maximum SBS values of 10.50 +/- 4.94 MPa (mean standard deviation) were reached in inserts sintered at 1300 degrees C, following the "self-etch" protocol of adhesive application. It could be concluded that resin-based composites could be strongly bonded to HAp/YSZ inserts, preferably with self-etch" adhesive application. In addition, the values of fracture toughness and hardness of the obtained inserts indicated the possibility of their usage as dentin substitutes, which could be a good prerequisite for satisfactory mechanics of restored teeth.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Composite nanostructured hydroxyapatite/yttrium stabilized zirconia dental inserts - The processing and application as dentin substitutes",
volume = "44",
number = "15",
pages = "18200-18208",
doi = "10.1016/j.ceramint.2018.07.028"
}
Ayoub, G., Veljović, Đ., Ležaja-Zebić, M., Miletić, V., Palcevskis, E., Petrović, R.,& Janaćković, Đ.. (2018). Composite nanostructured hydroxyapatite/yttrium stabilized zirconia dental inserts - The processing and application as dentin substitutes. in Ceramics International
Elsevier Sci Ltd, Oxford., 44(15), 18200-18208.
https://doi.org/10.1016/j.ceramint.2018.07.028
Ayoub G, Veljović Đ, Ležaja-Zebić M, Miletić V, Palcevskis E, Petrović R, Janaćković Đ. Composite nanostructured hydroxyapatite/yttrium stabilized zirconia dental inserts - The processing and application as dentin substitutes. in Ceramics International. 2018;44(15):18200-18208.
doi:10.1016/j.ceramint.2018.07.028 .
Ayoub, Giuma, Veljović, Đorđe, Ležaja-Zebić, Maja, Miletić, Vesna, Palcevskis, Eriks, Petrović, Rada, Janaćković, Đorđe, "Composite nanostructured hydroxyapatite/yttrium stabilized zirconia dental inserts - The processing and application as dentin substitutes" in Ceramics International, 44, no. 15 (2018):18200-18208,
https://doi.org/10.1016/j.ceramint.2018.07.028 . .
26
13
22

The effect of calcinated hydroxyapatite and magnesium doped hydroxyapatite as fillers on the mechanical properties of a model bisgma/tegdma dental composite initially and after aging

Matić, Tamara; Ležaja-Zebić, Maja; Cvijović-Alagić, Ivana; Miletić, Vesna; Petrović, Rada; Janaćković, Đorđe; Veljović, Đorđe

(Savez inženjera metalurgije Srbije, Beograd, 2018)

TY  - JOUR
AU  - Matić, Tamara
AU  - Ležaja-Zebić, Maja
AU  - Cvijović-Alagić, Ivana
AU  - Miletić, Vesna
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
AU  - Veljović, Đorđe
PY  - 2018
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/2281
AB  - This study aimed to investigate the possibility of modifying model BisGMA/TEGDMA dental composite by substituting 10 wt. % of conventional glass fillers with bioactive fillers based on calcinated nanosized hydroxyapatite (HAp) and Mg-doped hydroxyapatite (Mg-HAp). HAp and Mg-HAp powders were synthesized hydrothermally. Mechanical properties: hardness by Vickers (HV) and flexural strength (Fs) were tested initially and after being stored for 28 days in simulated body fluid (SBF). The experimental composites with HAp and Mg-HAp particles showed no statistically significant difference in HV compared to the control (p>0.05) either initially or after storage. Although mean Fs values of modified composites tested initially were lower (62 MPa) than those of the control (72 MPa), after 28 days of storage in SBF Fs values were greater for modified composites (42 MPa control sample, 48 MPa HAp, and Mg-HAp samples). In vitro bioactivity of BisGMA/TEGDMA composites with HAp and Mg-HAp particles after 28 days in SBF was not detected.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metallurgical & Materials Engineering
T1  - The effect of calcinated hydroxyapatite and magnesium doped hydroxyapatite as fillers on the mechanical properties of a model bisgma/tegdma dental composite initially and after aging
VL  - 24
IS  - 4
SP  - 271
EP  - 281
DO  - 10.30544/403
ER  - 
@article{
author = "Matić, Tamara and Ležaja-Zebić, Maja and Cvijović-Alagić, Ivana and Miletić, Vesna and Petrović, Rada and Janaćković, Đorđe and Veljović, Đorđe",
year = "2018",
abstract = "This study aimed to investigate the possibility of modifying model BisGMA/TEGDMA dental composite by substituting 10 wt. % of conventional glass fillers with bioactive fillers based on calcinated nanosized hydroxyapatite (HAp) and Mg-doped hydroxyapatite (Mg-HAp). HAp and Mg-HAp powders were synthesized hydrothermally. Mechanical properties: hardness by Vickers (HV) and flexural strength (Fs) were tested initially and after being stored for 28 days in simulated body fluid (SBF). The experimental composites with HAp and Mg-HAp particles showed no statistically significant difference in HV compared to the control (p>0.05) either initially or after storage. Although mean Fs values of modified composites tested initially were lower (62 MPa) than those of the control (72 MPa), after 28 days of storage in SBF Fs values were greater for modified composites (42 MPa control sample, 48 MPa HAp, and Mg-HAp samples). In vitro bioactivity of BisGMA/TEGDMA composites with HAp and Mg-HAp particles after 28 days in SBF was not detected.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metallurgical & Materials Engineering",
title = "The effect of calcinated hydroxyapatite and magnesium doped hydroxyapatite as fillers on the mechanical properties of a model bisgma/tegdma dental composite initially and after aging",
volume = "24",
number = "4",
pages = "271-281",
doi = "10.30544/403"
}
Matić, T., Ležaja-Zebić, M., Cvijović-Alagić, I., Miletić, V., Petrović, R., Janaćković, Đ.,& Veljović, Đ.. (2018). The effect of calcinated hydroxyapatite and magnesium doped hydroxyapatite as fillers on the mechanical properties of a model bisgma/tegdma dental composite initially and after aging. in Metallurgical & Materials Engineering
Savez inženjera metalurgije Srbije, Beograd., 24(4), 271-281.
https://doi.org/10.30544/403
Matić T, Ležaja-Zebić M, Cvijović-Alagić I, Miletić V, Petrović R, Janaćković Đ, Veljović Đ. The effect of calcinated hydroxyapatite and magnesium doped hydroxyapatite as fillers on the mechanical properties of a model bisgma/tegdma dental composite initially and after aging. in Metallurgical & Materials Engineering. 2018;24(4):271-281.
doi:10.30544/403 .
Matić, Tamara, Ležaja-Zebić, Maja, Cvijović-Alagić, Ivana, Miletić, Vesna, Petrović, Rada, Janaćković, Đorđe, Veljović, Đorđe, "The effect of calcinated hydroxyapatite and magnesium doped hydroxyapatite as fillers on the mechanical properties of a model bisgma/tegdma dental composite initially and after aging" in Metallurgical & Materials Engineering, 24, no. 4 (2018):271-281,
https://doi.org/10.30544/403 . .
3
1

Shear bond strength to dentine of dental adhesives containing hydroxyapatite nano-fillers

Ležaja, Maja; Jokić, Bojan; Veljović, Đorđe; Miletić, Vesna

(Taylor & Francis Ltd, Abingdon, 2016)

TY  - JOUR
AU  - Ležaja, Maja
AU  - Jokić, Bojan
AU  - Veljović, Đorđe
AU  - Miletić, Vesna
PY  - 2016
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/2100
AB  - The aim of this study was to compare the effect of hydroxyapatite (HAP) nano-rods (HAP rods) and HAP nano-sticks (HAP sticks) added to commercial adhesives on the macro-shear bond strength (SBS) to dentine and morphology of the adhesive-dentine interface. HAP was added to Single Bond Universal (SBU, 3M ESPE) and Te-Econom Bond (TeE; Ivoclar Vivadent), in the form of water suspensions to avoid agglomeration of nano-particles and to achieve HAP concentrations of 0.5, 1.0 and 1.5 wt%. Following a 'total-etch' or a 'self-etch' protocol, the adhesives were applied to flat dentine surface of 162 intact human, third molars (N = 6/group). Composite (Z250, 3M ESPE) was built-up using a split stainless steel mould, 3 mm in diameter. SBS was tested using a universal testing machine at 1 mm/min until fracture. Data were statistically analysed using two-way and one-way analysis of variance with Tukey's post-test (alpha = 0.05). HAP(rods) had no significant effect on SBS of the tested adhesives while HAP(sticks) improved bond strength to dentine only of adhesives applied following the 'total-etch' total-etch protocol. SBS values of SBU containing 1% HAP(sticks) (15.10 +/- 2.96 MPa) and TeE containing 0.5% HAP(sticks) applied following the total-etch protocol (12.96 +/- 4.48 MPa) were higher than those of their respective control groups (10.36 +/- 2.68 and 7.97 +/- 3.64 MPa). Samples with higher SBS showed more 'mixed' failures. HAP nano-fillers may improve bond strength of total-etch adhesives without an adverse effect on adhesive dispersion on dentine and its ability to infiltrate dentinal tubules.
PB  - Taylor & Francis Ltd, Abingdon
T2  - Journal of Adhesion Science & Technology
T1  - Shear bond strength to dentine of dental adhesives containing hydroxyapatite nano-fillers
VL  - 30
IS  - 24
SP  - 2678
EP  - 2689
DO  - 10.1080/01694243.2016.1197086
ER  - 
@article{
author = "Ležaja, Maja and Jokić, Bojan and Veljović, Đorđe and Miletić, Vesna",
year = "2016",
abstract = "The aim of this study was to compare the effect of hydroxyapatite (HAP) nano-rods (HAP rods) and HAP nano-sticks (HAP sticks) added to commercial adhesives on the macro-shear bond strength (SBS) to dentine and morphology of the adhesive-dentine interface. HAP was added to Single Bond Universal (SBU, 3M ESPE) and Te-Econom Bond (TeE; Ivoclar Vivadent), in the form of water suspensions to avoid agglomeration of nano-particles and to achieve HAP concentrations of 0.5, 1.0 and 1.5 wt%. Following a 'total-etch' or a 'self-etch' protocol, the adhesives were applied to flat dentine surface of 162 intact human, third molars (N = 6/group). Composite (Z250, 3M ESPE) was built-up using a split stainless steel mould, 3 mm in diameter. SBS was tested using a universal testing machine at 1 mm/min until fracture. Data were statistically analysed using two-way and one-way analysis of variance with Tukey's post-test (alpha = 0.05). HAP(rods) had no significant effect on SBS of the tested adhesives while HAP(sticks) improved bond strength to dentine only of adhesives applied following the 'total-etch' total-etch protocol. SBS values of SBU containing 1% HAP(sticks) (15.10 +/- 2.96 MPa) and TeE containing 0.5% HAP(sticks) applied following the total-etch protocol (12.96 +/- 4.48 MPa) were higher than those of their respective control groups (10.36 +/- 2.68 and 7.97 +/- 3.64 MPa). Samples with higher SBS showed more 'mixed' failures. HAP nano-fillers may improve bond strength of total-etch adhesives without an adverse effect on adhesive dispersion on dentine and its ability to infiltrate dentinal tubules.",
publisher = "Taylor & Francis Ltd, Abingdon",
journal = "Journal of Adhesion Science & Technology",
title = "Shear bond strength to dentine of dental adhesives containing hydroxyapatite nano-fillers",
volume = "30",
number = "24",
pages = "2678-2689",
doi = "10.1080/01694243.2016.1197086"
}
Ležaja, M., Jokić, B., Veljović, Đ.,& Miletić, V.. (2016). Shear bond strength to dentine of dental adhesives containing hydroxyapatite nano-fillers. in Journal of Adhesion Science & Technology
Taylor & Francis Ltd, Abingdon., 30(24), 2678-2689.
https://doi.org/10.1080/01694243.2016.1197086
Ležaja M, Jokić B, Veljović Đ, Miletić V. Shear bond strength to dentine of dental adhesives containing hydroxyapatite nano-fillers. in Journal of Adhesion Science & Technology. 2016;30(24):2678-2689.
doi:10.1080/01694243.2016.1197086 .
Ležaja, Maja, Jokić, Bojan, Veljović, Đorđe, Miletić, Vesna, "Shear bond strength to dentine of dental adhesives containing hydroxyapatite nano-fillers" in Journal of Adhesion Science & Technology, 30, no. 24 (2016):2678-2689,
https://doi.org/10.1080/01694243.2016.1197086 . .
11
8
12

Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization

Ležaja, Maja; Veljović, Đorđe; Manojlović, Dragica; Milošević, Miloš; Mitrović, Nenad; Janaćković, Đorđe; Miletić, Vesna

(Elsevier Sci Ltd, Oxford, 2015)

TY  - JOUR
AU  - Ležaja, Maja
AU  - Veljović, Đorđe
AU  - Manojlović, Dragica
AU  - Milošević, Miloš
AU  - Mitrović, Nenad
AU  - Janaćković, Đorđe
AU  - Miletić, Vesna
PY  - 2015
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/1962
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
VL  - 31
IS  - 2
SP  - 171
EP  - 181
DO  - 10.1016/j.dental.2014.11.017
ER  - 
@article{
author = "Ležaja, 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",
volume = "31",
number = "2",
pages = "171-181",
doi = "10.1016/j.dental.2014.11.017"
}
Ležaja, 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
Ležaja 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 .
Ležaja, 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 . .
18
10
20

Effect of hydroxyapatite spheres, whiskers, and nanoparticles on mechanical properties of a model BisGMA/TEGDMA composite initially and after storage

Ležaja, Maja; Veljović, Đorđe; Jokić, Bojan; Cvijović-Alagić, Ivana; Zrilić, Milorad; Miletić, Vesna

(Wiley-Blackwell, Hoboken, 2013)

TY  - JOUR
AU  - Ležaja, Maja
AU  - Veljović, Đorđe
AU  - Jokić, Bojan
AU  - Cvijović-Alagić, Ivana
AU  - Zrilić, Milorad
AU  - Miletić, Vesna
PY  - 2013
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/1848
AB  - This study investigated the effect of shape, size, and surface modification of hydroxyapatite (HAP) fillers on the degree of conversion (DC) and mechanical properties of a model BisGMA/TEGDMA composite initially and after 4 weeks of storage. Ten percent of conventional glass fillers were replaced by HAP spheres (Sph), silicon-doped spheres (Sph(Si)), whiskers (Wh), silicon-doped whiskers (Wh(Si)), and nanosized HAP particles (Nano). Spheres were specifically structured agglomerates consisting of a central void and radially orientated primary particles, whereas whiskers were compact monocrystals. DC, Vickers hardness (HV), flexural strength (Fs), flexural modulus (Ef), compressive strength (Cs), and compressive modulus (Ec) were tested. There were no significant differences in the DC between all tested groups. HV decreased by 5.4-17% with the addition of HAP, while Fs increased by 13.9-29% except in Nano group (decrease by 13%). After storage, Sph and Sph(Si) groups showed similar HV, Ef, Cs and Ec and higher Fs than the control. The fracture mode of HAP spheres was through the central void whereas whiskers showed longitudinal delamination, transverse, and mixed fractures. HAP spheres with or without silicon- doping have a potential to be part of the filler content of dental composites.
PB  - Wiley-Blackwell, Hoboken
T2  - Journal of Biomedical Materials Research Part B: Applied Biomaterials
T1  - Effect of hydroxyapatite spheres, whiskers, and nanoparticles on mechanical properties of a model BisGMA/TEGDMA composite initially and after storage
VL  - 101
IS  - 8
SP  - 1469
EP  - 1476
DO  - 10.1002/jbm.b.32967
ER  - 
@article{
author = "Ležaja, Maja and Veljović, Đorđe and Jokić, Bojan and Cvijović-Alagić, Ivana and Zrilić, Milorad and Miletić, Vesna",
year = "2013",
abstract = "This study investigated the effect of shape, size, and surface modification of hydroxyapatite (HAP) fillers on the degree of conversion (DC) and mechanical properties of a model BisGMA/TEGDMA composite initially and after 4 weeks of storage. Ten percent of conventional glass fillers were replaced by HAP spheres (Sph), silicon-doped spheres (Sph(Si)), whiskers (Wh), silicon-doped whiskers (Wh(Si)), and nanosized HAP particles (Nano). Spheres were specifically structured agglomerates consisting of a central void and radially orientated primary particles, whereas whiskers were compact monocrystals. DC, Vickers hardness (HV), flexural strength (Fs), flexural modulus (Ef), compressive strength (Cs), and compressive modulus (Ec) were tested. There were no significant differences in the DC between all tested groups. HV decreased by 5.4-17% with the addition of HAP, while Fs increased by 13.9-29% except in Nano group (decrease by 13%). After storage, Sph and Sph(Si) groups showed similar HV, Ef, Cs and Ec and higher Fs than the control. The fracture mode of HAP spheres was through the central void whereas whiskers showed longitudinal delamination, transverse, and mixed fractures. HAP spheres with or without silicon- doping have a potential to be part of the filler content of dental composites.",
publisher = "Wiley-Blackwell, Hoboken",
journal = "Journal of Biomedical Materials Research Part B: Applied Biomaterials",
title = "Effect of hydroxyapatite spheres, whiskers, and nanoparticles on mechanical properties of a model BisGMA/TEGDMA composite initially and after storage",
volume = "101",
number = "8",
pages = "1469-1476",
doi = "10.1002/jbm.b.32967"
}
Ležaja, M., Veljović, Đ., Jokić, B., Cvijović-Alagić, I., Zrilić, M.,& Miletić, V.. (2013). Effect of hydroxyapatite spheres, whiskers, and nanoparticles on mechanical properties of a model BisGMA/TEGDMA composite initially and after storage. in Journal of Biomedical Materials Research Part B: Applied Biomaterials
Wiley-Blackwell, Hoboken., 101(8), 1469-1476.
https://doi.org/10.1002/jbm.b.32967
Ležaja M, Veljović Đ, Jokić B, Cvijović-Alagić I, Zrilić M, Miletić V. Effect of hydroxyapatite spheres, whiskers, and nanoparticles on mechanical properties of a model BisGMA/TEGDMA composite initially and after storage. in Journal of Biomedical Materials Research Part B: Applied Biomaterials. 2013;101(8):1469-1476.
doi:10.1002/jbm.b.32967 .
Ležaja, Maja, Veljović, Đorđe, Jokić, Bojan, Cvijović-Alagić, Ivana, Zrilić, Milorad, Miletić, Vesna, "Effect of hydroxyapatite spheres, whiskers, and nanoparticles on mechanical properties of a model BisGMA/TEGDMA composite initially and after storage" in Journal of Biomedical Materials Research Part B: Applied Biomaterials, 101, no. 8 (2013):1469-1476,
https://doi.org/10.1002/jbm.b.32967 . .
27
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28

Silicon-doped biphasic alpha-calcium-phosphate/hydroxyapatite scaffolds obtained by a replica foam method using uniform pre-annealed spherical particles

Jokić, Bojan; Stamenković, Ivan; Zrilić, Milorad; Obradović-Đuričić, Kosovka; Petrović, Rada; Janaćković, Đorđe

(Elsevier Science Bv, Amsterdam, 2012)

TY  - JOUR
AU  - Jokić, Bojan
AU  - Stamenković, Ivan
AU  - Zrilić, Milorad
AU  - Obradović-Đuričić, Kosovka
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
PY  - 2012
UR  - https://smile.stomf.bg.ac.rs/handle/123456789/1757
AB  - In this study, spherical particles of hydroxyapatite (HA) and alpha-tricalcium phosphate (alpha-Ca-3(PO4)(2): alpha-TCP) doped with different amounts of silicon were used for the preparation of scaffolds. The scaffolds were obtained by a replica foam method using particles of narrow size distribution pre-annealed at 1150 degrees C with different alpha-TCP and HA contents in order to investigate the effect of composition on their morphological and mechanical properties. Morphology, size, and distribution of the particles were characterized using scanning electron microscopy and particle size analyzer. The obtained alpha-TCP-HA scaffolds had compressive strengths up to 5.7 MPa with a uniform and interconnected porous structure. X-ray diffraction analysis used to determine the crystal structure of the scaffolds confirmed that the alpha-TCP-HA content could be controlled by the amount of silicon ions.
PB  - Elsevier Science Bv, Amsterdam
T2  - Materials Letters
T1  - Silicon-doped biphasic alpha-calcium-phosphate/hydroxyapatite scaffolds obtained by a replica foam method using uniform pre-annealed spherical particles
VL  - 74
SP  - 155
EP  - 158
DO  - 10.1016/j.matlet.2012.01.081
ER  - 
@article{
author = "Jokić, Bojan and Stamenković, Ivan and Zrilić, Milorad and Obradović-Đuričić, Kosovka and Petrović, Rada and Janaćković, Đorđe",
year = "2012",
abstract = "In this study, spherical particles of hydroxyapatite (HA) and alpha-tricalcium phosphate (alpha-Ca-3(PO4)(2): alpha-TCP) doped with different amounts of silicon were used for the preparation of scaffolds. The scaffolds were obtained by a replica foam method using particles of narrow size distribution pre-annealed at 1150 degrees C with different alpha-TCP and HA contents in order to investigate the effect of composition on their morphological and mechanical properties. Morphology, size, and distribution of the particles were characterized using scanning electron microscopy and particle size analyzer. The obtained alpha-TCP-HA scaffolds had compressive strengths up to 5.7 MPa with a uniform and interconnected porous structure. X-ray diffraction analysis used to determine the crystal structure of the scaffolds confirmed that the alpha-TCP-HA content could be controlled by the amount of silicon ions.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Materials Letters",
title = "Silicon-doped biphasic alpha-calcium-phosphate/hydroxyapatite scaffolds obtained by a replica foam method using uniform pre-annealed spherical particles",
volume = "74",
pages = "155-158",
doi = "10.1016/j.matlet.2012.01.081"
}
Jokić, B., Stamenković, I., Zrilić, M., Obradović-Đuričić, K., Petrović, R.,& Janaćković, Đ.. (2012). Silicon-doped biphasic alpha-calcium-phosphate/hydroxyapatite scaffolds obtained by a replica foam method using uniform pre-annealed spherical particles. in Materials Letters
Elsevier Science Bv, Amsterdam., 74, 155-158.
https://doi.org/10.1016/j.matlet.2012.01.081
Jokić B, Stamenković I, Zrilić M, Obradović-Đuričić K, Petrović R, Janaćković Đ. Silicon-doped biphasic alpha-calcium-phosphate/hydroxyapatite scaffolds obtained by a replica foam method using uniform pre-annealed spherical particles. in Materials Letters. 2012;74:155-158.
doi:10.1016/j.matlet.2012.01.081 .
Jokić, Bojan, Stamenković, Ivan, Zrilić, Milorad, Obradović-Đuričić, Kosovka, Petrović, Rada, Janaćković, Đorđe, "Silicon-doped biphasic alpha-calcium-phosphate/hydroxyapatite scaffolds obtained by a replica foam method using uniform pre-annealed spherical particles" in Materials Letters, 74 (2012):155-158,
https://doi.org/10.1016/j.matlet.2012.01.081 . .
11
7
9