Danica Popović (Author), Rajko Bobovnik (Author), Silvester Bolka (Author), Miroslav Vukadinovič (Author), Vojkan Lazić (Author), Rebeka Rudolf (Author)

Abstract

Wear resistance is one of the most important physical properties of the artificial teeth used in acrylic dentures. The goal of this research was to synthesize a new composite material made of matrix Poly-(methyl methacrylate)-PMMA with different percentages (2 % and 3 % of volume fractions) of zinc-oxide nanoparticles (ZnO NPs) as reinforcing elements, to improve its mechanical properties. The dynamic mechanical behaviour of this composite was studied through the DMA method in comparison to the pure PMMA supported by the characterization of their microstructures. Then the wear resistance was analysed on the samples, which were prepared in the form of teeth. In this context their vertical height loss was measured after 100,000 chewing cycles on a chewing simulator, before and after the artificial thermal ageing. Investigations showed that the PMMA/ZnO NP composites dampened the vibrations better than the pure PMMA, which could be assigned to the homogenous distribution of ZnO NPs in the PMMA matrix. It was found that the mean vertical height loss for the pure PMMA teeth was significantly higher (more than 4 times) compared to composite teeth made with ZnO NPs. Introducing the thermal artificial ageing led to the finding that there was no effect on the height loss by the composite material with 3 % of volume fractions of ZnO NPs. Based on this it was concluded that PMMA/ZnO NPs composites showed improved in-vitro wear resistance compared to acrylic-resin denture teeth, so this new composite material should be preferred when occlusal stability is considered to be of high priority.

Keywords

poly-methyl methacrylate;PMMA;zinc-oxide nanoparticles;composite;resin teeth;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
UDC: 620.3:616.314-77:678.6:67.017
COBISS: 20916758 Link will open in a new window
ISSN: 1580-2949
Parent publication: Materiali in tehnologije
Views: 1075
Downloads: 391
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Slovenian
Secondary title: Sinteza PMMA/ZnO nanodelcev kompozitov za izdelavo zob iz umetnih smol
Secondary abstract: Odpornost proti obrabi je ena izmed najbolj pomembnih fizikalnih lastnosti umetnih zob pri akrilnih protezah. Cilj te raziskave je bil sintetiziranje novega kompozitnega materiala, izdelanega iz matrice poli-(metil meta akrilata) – PMMA z različnimi volumskimi odstotki (2 % in 3 %) nanodelcev cinkovega oksida (ZnO NPs), uporabljenimi kot oja~itveni element za izboljšanje mehanskih lastnosti materiala. Dinami~no mehansko obna{anje teh kompozitov smo raziskali z metodo DMA v primerjavi s čistim PMMA, ter s karakterizacijo njihovih mikrostruktur. Nato je bila analizirana odpornost proti obrabi na vzorcih, ki so bili pripravljeni v obliki zob. Izmerjena je bila njihova navpična izguba višine po 100.000 žvečilnih ciklih na žvečilnem simulatorju, pred in po umetnem toplotnem staranju. Preiskave so pokazale, da so PMMA/ZnO NPs kompoziti bolje blažili vibracije kot čisti PMMA, kar lahko pripišemo homogeni porazdelitvi ZnO NPs v PMMA matrici. Ugotovili smo, da je bila povprečna navpična izguba višina za čisti PMMA zob znatno višja (več kot 4×) v primerjavi s kompozitnimi zobmi z ZnO NPs. Umetno toplotno staranje ni imelo učinka na izgubo navpične višine zoba iz kompozitnega materiala s 3 volumskimi % ZnO NPs. Na podlagi tega smo sklenili, da imajo kompoziti PMMA/ZnO NPs izboljšano in vitro odpornost proti obrabi, v primerjavi z zobno protezo iz akrilne smole, zato naj bi imel ta novi kompozitni material prednost pri uporabi, kadar je potrebna okluzalna stabilnost.
Secondary keywords: nanodelci cinkovega oksida;kompoziti;poli-metil meta akrilat;zobje iz umetnih smol;umetne smole;izdelava zob;
URN: URN:NBN:SI
Type (COBISS): Scientific work
Pages: str. 871-878
Volume: ǂLetn. ǂ51
Issue: ǂšt. ǂ5
Chronology: sep.-okt. 2017
DOI: 10.17222/mit.2017.025
ID: 10888627