Počet záznamů: 1
Microstructural characterization of dental zinc phosphate cements using combined small angle neutron scattering and microfocus X-ray computed tomography
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SYSNO ASEP 0473535 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Microstructural characterization of dental zinc phosphate cements using combined small angle neutron scattering and microfocus X-ray computed tomography Tvůrce(i) Viani, Alberto (UTAM-F) RID, ORCID, SAI
Sotiriadis, Konstantinos (UTAM-F) RID, ORCID, SAI
Kumpová, Ivana (UTAM-F) RID, SAI, ORCID
Mancini, L. (IT)
Appavou, M.-S. (DE)Celkový počet autorů 5 Zdroj.dok. Dental Materials. - : Elsevier - ISSN 0109-5641
Roč. 33, č. 4 (2017), s. 402-417Poč.str. 16 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova zinc phosphate cements ; small angle neutron scattering ; X-ray micro-computed tomography ; X-ray powder diffraction ; zinc oxide ; acid-base cements Vědní obor RIV JJ - Ostatní materiály Obor OECD Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics CEP LO1219 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy UT WOS 000396410200009 EID SCOPUS 85013159424 DOI 10.1016/j.dental.2017.01.008 Anotace To characterize the microstructure of two zinc phosphate cement formulations in order to investigate the role of liquid/solid ratio and composition of powder component, on the developed porosity and, consequently, on compressive strength. Methods. X-ray powder diffraction with the Rietveld method was used to study the phase composition of zinc oxide powder and cements. Powder component and cement microstructure were investigated with scanning electron microscopy. Small angle neutron scattering (SANS) and microfocus X-ray computed tomography (XmCT) were together employed to characterize porosity and microstructure of dental cements. Compressive strength tests were performed to evaluate their mechanical performance. Results. The beneficial effects obtained by the addition of Al, Mg and B to modulate powder reactivity were mitigated by the crystallization of a Zn aluminate phase not involved in the cement setting reaction. Both cements showed spherical pores with a bimodal distribution at the micro/nano-scale. Pores, containing a low density gel-like phase, developed through segregation of liquid during setting. Increasing liquid/solid ratio from 0.378 to 0.571, increased both SANS and XmCT-derived specific surface area (by 56% and 22%, respectively), porosity (XmCT-derived porosity increased from 3.8% to 5.2%), the relative fraction of large pores >= 50 decreased compressive strength from 50 +/- 3 MPa to 39 +/- 3 MPa, and favored microstructural and compositional inhomogeneities. Significance. Explain aspects of powder design affecting the setting reaction and, in turn, cement performance, to help in optimizing cement formulation. The mechanism behind development of porosity and specific surface area explains mechanical performance, and processes such as erosion and fluoride release/uptake. Pracoviště Ústav teoretické a aplikované mechaniky Kontakt Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Rok sběru 2018 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0109564116305127
Počet záznamů: 1