TY  - CONF
AU  - Matić, Tamara
AU  - Ležaja Zebić, Maja
AU  - Miletić, Vesna
AU  - Janaćković, Đorđe
AU  - Veljović, Đorđe
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6685
UR  - https://ecers2023.org/en/program/full-conference-program/34
AB  - The main drawback of resin-based composites (RBCs) widely used in restorative dentistry presents their volumetric shrinkage during the polymerization that can lead to clinical failures of restorations such asmarginal gap formation, bacterial microleakage, fractures, and postoperative sensitivity. To address this problem, sintered hydroxyapatite based dental inserts were introduced in the central part of molar teethrestoration, due to chemical and structural similarities with inorganic part of teeth.
The fabrication of bioceramic dental inserts based on HAP doped with Sr and/or Mg ions presents a way to obtain a dentin substitute that has even greater resemblance to the biological apatite in dentin. However, ion-substitutions arise lattice strain that can have a signifi cant impact on phase composition and properties of apatite materials, especially upon thermal treatment, which could be determining for their further application.
The aims of this study were to comparatively analyze physico-chemical and mechanical properties of the Sr- or Mg-, and Sr+Mg substituted HAP based dental inserts; and evaluate their possible application as dentinsubstitutes. Mono (5 mol. % Sr or Mg ions) and binary- (3 mol.% Sr and 3 mol.% Mg ions) doped HAP nanoparticles were hydrothermally obtained, isostatically pressed into compacts and eventually sintered at 1200°C to obtain dental inserts. The inserts are meant to be adhered to the cavity walls as well as topped with resin composite for sealing and esthetic purposes. Bonding ability of obtained inserts with different commercialrestorative materials, as well as fracture resistance of human molars restored with doped HAP inserts was investigated.
Ion doping was found to infl uence phase compositions of sintered inserts, leading to different mechanical properties and etching behavior of inserts. All inserts showed fracture toughness and bonding ability torestorative materials similar to dentin, while the highest bond strength was obtained for HAP insert doped with 5 mol% Mg (Mg-HAP) bonded to. Fracture resistance of human molars restored with Mg-HAP wasshown to be similar to the fracture resistance of the conventionally restored molars. In conclusion the obtained hydroxyapatite based dental inserts present promising materials for application as dentin substitutes inrestorative dentistry, which have the potential to extend the durability of the restoration.
PB  - European Ceramic Society
C3  - The XVIIIth Conference and Exhibition of the European Ceramic Society (ECerS), Lyon-France, 2-6 July 2023
T1  - Sintered dental inserts based on ion-doped hydroxyapatite as dentin substitutes
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6685
ER  - 

@conference{
author = "Matić, Tamara and Ležaja Zebić, Maja and Miletić, Vesna and Janaćković, Đorđe and Veljović, Đorđe",
year = "2023",
abstract = "The main drawback of resin-based composites (RBCs) widely used in restorative dentistry presents their volumetric shrinkage during the polymerization that can lead to clinical failures of restorations such asmarginal gap formation, bacterial microleakage, fractures, and postoperative sensitivity. To address this problem, sintered hydroxyapatite based dental inserts were introduced in the central part of molar teethrestoration, due to chemical and structural similarities with inorganic part of teeth.
The fabrication of bioceramic dental inserts based on HAP doped with Sr and/or Mg ions presents a way to obtain a dentin substitute that has even greater resemblance to the biological apatite in dentin. However, ion-substitutions arise lattice strain that can have a signifi cant impact on phase composition and properties of apatite materials, especially upon thermal treatment, which could be determining for their further application.
The aims of this study were to comparatively analyze physico-chemical and mechanical properties of the Sr- or Mg-, and Sr+Mg substituted HAP based dental inserts; and evaluate their possible application as dentinsubstitutes. Mono (5 mol. % Sr or Mg ions) and binary- (3 mol.% Sr and 3 mol.% Mg ions) doped HAP nanoparticles were hydrothermally obtained, isostatically pressed into compacts and eventually sintered at 1200°C to obtain dental inserts. The inserts are meant to be adhered to the cavity walls as well as topped with resin composite for sealing and esthetic purposes. Bonding ability of obtained inserts with different commercialrestorative materials, as well as fracture resistance of human molars restored with doped HAP inserts was investigated.
Ion doping was found to infl uence phase compositions of sintered inserts, leading to different mechanical properties and etching behavior of inserts. All inserts showed fracture toughness and bonding ability torestorative materials similar to dentin, while the highest bond strength was obtained for HAP insert doped with 5 mol% Mg (Mg-HAP) bonded to. Fracture resistance of human molars restored with Mg-HAP wasshown to be similar to the fracture resistance of the conventionally restored molars. In conclusion the obtained hydroxyapatite based dental inserts present promising materials for application as dentin substitutes inrestorative dentistry, which have the potential to extend the durability of the restoration.",
publisher = "European Ceramic Society",
journal = "The XVIIIth Conference and Exhibition of the European Ceramic Society (ECerS), Lyon-France, 2-6 July 2023",
title = "Sintered dental inserts based on ion-doped hydroxyapatite as dentin substitutes",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6685"
}

Matić, T., Ležaja Zebić, M., Miletić, V., Janaćković, Đ.,& Veljović, Đ.. (2023). Sintered dental inserts based on ion-doped hydroxyapatite as dentin substitutes. in The XVIIIth Conference and Exhibition of the European Ceramic Society (ECerS), Lyon-France, 2-6 July 2023
European Ceramic Society..
https://hdl.handle.net/21.15107/rcub_technorep_6685

Matić T, Ležaja Zebić M, Miletić V, Janaćković Đ, Veljović Đ. Sintered dental inserts based on ion-doped hydroxyapatite as dentin substitutes. in The XVIIIth Conference and Exhibition of the European Ceramic Society (ECerS), Lyon-France, 2-6 July 2023. 2023;.
https://hdl.handle.net/21.15107/rcub_technorep_6685 .

Matić, Tamara, Ležaja Zebić, Maja, Miletić, Vesna, Janaćković, Đorđe, Veljović, Đorđe, "Sintered dental inserts based on ion-doped hydroxyapatite as dentin substitutes" in The XVIIIth Conference and Exhibition of the European Ceramic Society (ECerS), Lyon-France, 2-6 July 2023 (2023),
https://hdl.handle.net/21.15107/rcub_technorep_6685 .

TY  - JOUR
AU  - Matić, Tamara
AU  - Ležaja Zebić, Maja
AU  - Miletić, Vesna
AU  - Trajković, Isaak
AU  - Milošević, Miloš
AU  - Racić, Aleksandar
AU  - Veljović, Đorđe
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6659
AB  - This study aimed to (1) comparatively analyze properties of Sr- and Mg-substituted
hydroxyapatite (HAP)-based dental inserts; (2) evaluate insert bonding to restorative
materials, and (3) evaluate the effect of doped HAP inserts on fracture resistance
(FR) of human molars with large occlusal restorations. By ion-doping with Sr or Mg,
3 insert types were obtained and characterized using XRD, SEM, Vickers hardness and
fracture toughness. Shear bond strength (SBS) was determined between acid etched or
unetched inserts and following materials: Maxcem cement (Kerr); Filtek Z250
(3M) bonded with Single Bond Universal (SBU; 3M) or Clearfil Universal (Cf; Kuraray).
Modified Class I cavities were prepared in 16 intact molars and restored using insert
+ composite or composite only (control) (n = 8/group). FR of restored molars was
determined by static load until fracture upon thermal cycling. Fracture toughness was
similar between Sr/Mg-doped inserts (0.94–1.04 MPam 1/2 p = .429). Mg-doped
inserts showed greater hardness (range 4.78–5.15 GPa) than Sr6 inserts (3.74
± 0.31 GPa; p < .05). SBS for SBU and Cf adhesives (range 7.19–15.93 MPa) was higher
than for Maxcem (range 3.07–5.95 MPa) (p < .05). There was no significant difference
in FR between molars restored with insert-containing and control restorations (3.00
± 0.30 kN and 3.22 ± 0.42 kN, respectively; p > .05). HAP-based inserts doped with
Mg/Sr had different composition and mechanical properties. Adhesive bonding to
inserts resulted in greater bond strength than cementation, which may be improved by
insert acid-etching. Ion-doped HAP inserts did not affect FR of restored molars. In conclusion,
HAP-based dental inserts may potentially replace dentin in large cavities, without
affecting fracture resistance of restored teeth.
PB  - Wiley Periodicals LLC.
T2  - Journal of Biomedical Materials Research Part B: Applied Biomaterials
T1  - Hydroxyapatite-based dental inserts: microstructure, mechanical properties, bonding efficiency and fracture resistance of molars with occlusal restorations
DO  - 10.1002/jbm.b.35331
ER  - 

@article{
author = "Matić, Tamara and Ležaja Zebić, Maja and Miletić, Vesna and Trajković, Isaak and Milošević, Miloš and Racić, Aleksandar and Veljović, Đorđe",
year = "2023",
abstract = "This study aimed to (1) comparatively analyze properties of Sr- and Mg-substituted
hydroxyapatite (HAP)-based dental inserts; (2) evaluate insert bonding to restorative
materials, and (3) evaluate the effect of doped HAP inserts on fracture resistance
(FR) of human molars with large occlusal restorations. By ion-doping with Sr or Mg,
3 insert types were obtained and characterized using XRD, SEM, Vickers hardness and
fracture toughness. Shear bond strength (SBS) was determined between acid etched or
unetched inserts and following materials: Maxcem cement (Kerr); Filtek Z250
(3M) bonded with Single Bond Universal (SBU; 3M) or Clearfil Universal (Cf; Kuraray).
Modified Class I cavities were prepared in 16 intact molars and restored using insert
+ composite or composite only (control) (n = 8/group). FR of restored molars was
determined by static load until fracture upon thermal cycling. Fracture toughness was
similar between Sr/Mg-doped inserts (0.94–1.04 MPam 1/2 p = .429). Mg-doped
inserts showed greater hardness (range 4.78–5.15 GPa) than Sr6 inserts (3.74
± 0.31 GPa; p < .05). SBS for SBU and Cf adhesives (range 7.19–15.93 MPa) was higher
than for Maxcem (range 3.07–5.95 MPa) (p < .05). There was no significant difference
in FR between molars restored with insert-containing and control restorations (3.00
± 0.30 kN and 3.22 ± 0.42 kN, respectively; p > .05). HAP-based inserts doped with
Mg/Sr had different composition and mechanical properties. Adhesive bonding to
inserts resulted in greater bond strength than cementation, which may be improved by
insert acid-etching. Ion-doped HAP inserts did not affect FR of restored molars. In conclusion,
HAP-based dental inserts may potentially replace dentin in large cavities, without
affecting fracture resistance of restored teeth.",
publisher = "Wiley Periodicals LLC.",
journal = "Journal of Biomedical Materials Research Part B: Applied Biomaterials",
title = "Hydroxyapatite-based dental inserts: microstructure, mechanical properties, bonding efficiency and fracture resistance of molars with occlusal restorations",
doi = "10.1002/jbm.b.35331"
}

Matić, T., Ležaja Zebić, M., Miletić, V., Trajković, I., Milošević, M., Racić, A.,& Veljović, Đ.. (2023). Hydroxyapatite-based dental inserts: microstructure, mechanical properties, bonding efficiency and fracture resistance of molars with occlusal restorations. in Journal of Biomedical Materials Research Part B: Applied Biomaterials
Wiley Periodicals LLC...
https://doi.org/10.1002/jbm.b.35331

Matić T, Ležaja Zebić M, Miletić V, Trajković I, Milošević M, Racić A, Veljović Đ. Hydroxyapatite-based dental inserts: microstructure, mechanical properties, bonding efficiency and fracture resistance of molars with occlusal restorations. in Journal of Biomedical Materials Research Part B: Applied Biomaterials. 2023;.
doi:10.1002/jbm.b.35331 .

Matić, Tamara, Ležaja Zebić, Maja, Miletić, Vesna, Trajković, Isaak, Milošević, Miloš, Racić, Aleksandar, Veljović, Đorđe, "Hydroxyapatite-based dental inserts: microstructure, mechanical properties, bonding efficiency and fracture resistance of molars with occlusal restorations" in Journal of Biomedical Materials Research Part B: Applied Biomaterials (2023),
https://doi.org/10.1002/jbm.b.35331 . .

TY  - CONF
AU  - Matić, Tamara
AU  - Ležaja Zebić, Maja
AU  - Miletić, Vesna
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
AU  - Veljović, Đorđe
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6679
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Program and the Book of abstracts / Nineteenth Young Researchers' Conference Materials Science and Engineering, December 1-3, 2021, Belgrade, Serbia
T1  - Dental inserts based on calcium hydroxyapatite: The influence of cation doping
SP  - 13
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6679
ER  - 

@conference{
author = "Matić, Tamara and Ležaja Zebić, Maja and Miletić, Vesna and Petrović, Rada and Janaćković, Đorđe and Veljović, Đorđe",
year = "2021",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Program and the Book of abstracts / Nineteenth Young Researchers' Conference Materials Science and Engineering, December 1-3, 2021, Belgrade, Serbia",
title = "Dental inserts based on calcium hydroxyapatite: The influence of cation doping",
pages = "13",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6679"
}

Matić, T., Ležaja Zebić, M., Miletić, V., Petrović, R., Janaćković, Đ.,& Veljović, Đ.. (2021). Dental inserts based on calcium hydroxyapatite: The influence of cation doping. in Program and the Book of abstracts / Nineteenth Young Researchers' Conference Materials Science and Engineering, December 1-3, 2021, Belgrade, Serbia
Belgrade : Institute of Technical Sciences of SASA., 13.
https://hdl.handle.net/21.15107/rcub_technorep_6679

Matić T, Ležaja Zebić M, Miletić V, Petrović R, Janaćković Đ, Veljović Đ. Dental inserts based on calcium hydroxyapatite: The influence of cation doping. in Program and the Book of abstracts / Nineteenth Young Researchers' Conference Materials Science and Engineering, December 1-3, 2021, Belgrade, Serbia. 2021;:13.
https://hdl.handle.net/21.15107/rcub_technorep_6679 .

Matić, Tamara, Ležaja Zebić, Maja, Miletić, Vesna, Petrović, Rada, Janaćković, Đorđe, Veljović, Đorđe, "Dental inserts based on calcium hydroxyapatite: The influence of cation doping" in Program and the Book of abstracts / Nineteenth Young Researchers' Conference Materials Science and Engineering, December 1-3, 2021, Belgrade, Serbia (2021):13,
https://hdl.handle.net/21.15107/rcub_technorep_6679 .

TY  - CONF
AU  - Matić, Tamara
AU  - Ležaja Zebić, Maja
AU  - Miletić, Vesna
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
AU  - Veljović, Đorđe
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7315
AB  - Decayed or damaged tooth structure is widely being repaired with the resin
based dental composites (RBCs) in the clinical practice. However, relatively high failure rate
and short lifespan are common in the case of the larger posterior teeth restorations,
caused by the polymerization shrinkage of RBCs. In order to reduce the polymerization
shrinkage inorganic dental inserts were introduced. The aim of this study was to fabricate
dental inserts based on hydroxyapatite doped with 5 mol. % of magnesium ions (MgHAP)
and determine their bonding ability with a restorative material widely used in the clinical
practice – Clearfil Universal adhesive. The MgHAP powder and insert were characterized
using energy dispersive X-ray (EDX) analysis, X-ray diffraction (XRD) analysis and scanning
electron microscopy (FE-SEM). Bonding ability of the inserts with restorative material was
measured by shear bond strength (SBS) test, and the type of fracture was determined by
the optical microscope. The obtained mean SBS value of the MgHAP inserts was 12.7 MPa,
with mostly cohesive type of the fracture present. These inserts present promising dentin
substitutes for application in the restorative dentistry.
PB  - Belgrade : Institut za istraživanja i projektovanja u privredi
C3  - Abstract proceedings / Young Researches Conference 2020, YOURS 2020, 28th September 2020, Belgrade
T1  - Bonding ability of magnesium doped hydroxyapatite based insert with Clearfil dental adhesive
SP  - 40
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7315
ER  - 

@conference{
author = "Matić, Tamara and Ležaja Zebić, Maja and Miletić, Vesna and Petrović, Rada and Janaćković, Đorđe and Veljović, Đorđe",
year = "2020",
abstract = "Decayed or damaged tooth structure is widely being repaired with the resin
based dental composites (RBCs) in the clinical practice. However, relatively high failure rate
and short lifespan are common in the case of the larger posterior teeth restorations,
caused by the polymerization shrinkage of RBCs. In order to reduce the polymerization
shrinkage inorganic dental inserts were introduced. The aim of this study was to fabricate
dental inserts based on hydroxyapatite doped with 5 mol. % of magnesium ions (MgHAP)
and determine their bonding ability with a restorative material widely used in the clinical
practice – Clearfil Universal adhesive. The MgHAP powder and insert were characterized
using energy dispersive X-ray (EDX) analysis, X-ray diffraction (XRD) analysis and scanning
electron microscopy (FE-SEM). Bonding ability of the inserts with restorative material was
measured by shear bond strength (SBS) test, and the type of fracture was determined by
the optical microscope. The obtained mean SBS value of the MgHAP inserts was 12.7 MPa,
with mostly cohesive type of the fracture present. These inserts present promising dentin
substitutes for application in the restorative dentistry.",
publisher = "Belgrade : Institut za istraživanja i projektovanja u privredi",
journal = "Abstract proceedings / Young Researches Conference 2020, YOURS 2020, 28th September 2020, Belgrade",
title = "Bonding ability of magnesium doped hydroxyapatite based insert with Clearfil dental adhesive",
pages = "40",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7315"
}

Matić, T., Ležaja Zebić, M., Miletić, V., Petrović, R., Janaćković, Đ.,& Veljović, Đ.. (2020). Bonding ability of magnesium doped hydroxyapatite based insert with Clearfil dental adhesive. in Abstract proceedings / Young Researches Conference 2020, YOURS 2020, 28th September 2020, Belgrade
Belgrade : Institut za istraživanja i projektovanja u privredi., 40.
https://hdl.handle.net/21.15107/rcub_technorep_7315

Matić T, Ležaja Zebić M, Miletić V, Petrović R, Janaćković Đ, Veljović Đ. Bonding ability of magnesium doped hydroxyapatite based insert with Clearfil dental adhesive. in Abstract proceedings / Young Researches Conference 2020, YOURS 2020, 28th September 2020, Belgrade. 2020;:40.
https://hdl.handle.net/21.15107/rcub_technorep_7315 .

Matić, Tamara, Ležaja Zebić, Maja, Miletić, Vesna, Petrović, Rada, Janaćković, Đorđe, Veljović, Đorđe, "Bonding ability of magnesium doped hydroxyapatite based insert with Clearfil dental adhesive" in Abstract proceedings / Young Researches Conference 2020, YOURS 2020, 28th September 2020, Belgrade (2020):40,
https://hdl.handle.net/21.15107/rcub_technorep_7315 .

TY  - JOUR
AU  - Ayoub, Giuma
AU  - Ležaja-Zebić, Maja
AU  - Miletić, Vesna
AU  - Petrović, Rada
AU  - Veljović, Đorđe
AU  - Janaćković, Đorđe
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4476
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
EP  - 2470
IS  - 6
SP  - 2461
VL  - 108
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",
pages = "2470-2461",
number = "6",
volume = "108",
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., 108(6), 2461-2470.
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;108(6):2461-2470.
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, 108, no. 6 (2020):2461-2470,
https://doi.org/10.1002/jbm.b.34578 . .

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  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3918
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 gt 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
EP  - 281
IS  - 4
SP  - 271
VL  - 24
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 gt 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",
pages = "281-271",
number = "4",
volume = "24",
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 . .

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  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3936
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
EP  - 18208
IS  - 15
SP  - 18200
VL  - 44
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",
pages = "18208-18200",
number = "15",
volume = "44",
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 . .