Mоlimо vаs kоristitе оvај idеntifikаtоr zа citirаnjе ili оvај link dо оvе stаvkе:
https://open.uns.ac.rs/handle/123456789/7554
Nаziv: | Poly(methyl-methacrylate) nanocomposites with low silica addition | Аutоri: | Baloš, Sebastian Pilić, Branka Marković, Dubravka Pavličević, Jelena Lužanin, Ognjan |
Dаtum izdаvаnjа: | 1-апр-2014 | Čаsоpis: | Journal of Prosthetic Dentistry | Sažetak: | Statement of problem Poly(methyl-methacrylate) (PMMA) represents the most popular current denture material. However, its major drawbacks are insufficient ductility and strength. Purpose The purpose of this study was to improve the mechanical properties of PMMA in denture base application by adding small quantities of nanosilica. Material and method Silica nanoparticles were added to the liquid component of the tested materials. The standard heat polymerizing procedure was followed to obtain 6 PMMA - silicon dioxide (/SiO2) concentrations (0.023%, 0.046%, 0.091%, 0.23%, 0.46%, and 0.91% by volume). Microhardness and fracture toughness of each set of specimens was compared with the unmodified specimens. Furthermore, differential scanning calorimetry and scanning electron microscopy analyses were conducted, and the results obtained were correlated with the results of mechanical properties. Results It was found that the maximum microhardness and fracture toughness values of the materials tested were obtained for the lowest nanosilica content. A nanosilica content of 0.023% resulted in an almost unchanged glass transition temperature (Tg), whereas the maximum amount of nanosilica induced a considerable increase in Tg. A higher Tg indicated the possible existence of a thicker interfacial layer caused by the chain immobility due to the presence of the particles. However, scanning electron microscopy results demonstrated extensive agglomeration at 0.91% nanosilica, which may have prevented the formation of a homogenous reinforced field. At a nanosilica content of 0.023%, no agglomeration was observed, which probably influenced a more homogenous distribution of nanoparticles as well as uniform reinforcing fields. Conclusions Low nanoparticle content yields superior mechanical properties along with the lower cost of nanocomposite synthesis. | URI: | https://open.uns.ac.rs/handle/123456789/7554 | ISSN: | 00223913 | DOI: | 10.1016/j.prosdent.2013.06.021 |
Nаlаzi sе u kоlеkciјаmа: | TF Publikacije/Publications |
Prikаzаti cеlоkupаn zаpis stаvki
SCOPUSTM
Nаvоđеnjа
50
prоvеrеnо 10.05.2024.
Prеglеd/i stаnicа
28
Prоtеklа nеdеljа
12
12
Prоtеkli mеsеc
0
0
prоvеrеnо 10.05.2024.
Google ScholarTM
Prоvеritе
Аlt mеtrikа
Stаvkе nа DSpace-u su zаštićеnе аutоrskim prаvimа, sа svim prаvimа zаdržаnim, оsim аkо nije drugačije naznačeno.