Flexural strength and modulus of autopolimerized  poly(methyl methacrylate) with nanosilica

Sebastian Baloš; Branka Pilić; Djordje Petrović; Branislava Petronijević; Ivan Šarčev

doi:10.2298/VSP160203359B

Sebastian Baloš University of Novi Sad, Faculty of Technical Sciences, *Department for Production Engineering
Branka Pilić Faculty of Technology, Department of Materials Engineering
Djordje Petrović Faculty of Medicine
Branislava Petronijević
Ivan Šarčev Faculty of Medicine

DOI: https://doi.org/10.2298/VSP160203359B

Ključne reči: metilmetakrilati;, akrilati;, zubna proteza, podlaganje;, materijali, testiranje;, stres, mehanički;, silicijum dioksid;, elastičnost;, kalorimetrija

Sažetak

Uvod/Cilj. Autopolimerizujući ili hladno polimerizujući polimetilmetakrilatni materijali imaju niže mehaničke osobine u odnosu na toplo polimerizujuće polimetilmetakrilate, zbog ograničenog trajanja mešanja pre početka procesa polimerizacije. Cilj ovog rada bio je da se ispita efekat relativno niskih sadržaja nanosilike u cilju povećanja mehaničkih osobina hladno polimerizujućeg polimetilmetakrilata. Metode. U tečnu metilmetakrilat komponentu komercijalnog autopolimerizujućeg polimetilmetakrilatnog materijala za podlaganje zubnih proteza umešane su nanočestice veličine 7 nm, a potom je modifikovana tečnost pomešana sa prahom polimetilmetakrilata. Ispitana su tri sadržaja nanosilike: 0,05%, 0,2% i 1,5%. Izvršena su ispitivanja modula elastičnosti i čvrstoće. Rezultati su statistički analizirani uz primenu jednostruke statističke analize ANOVA i Tukey-testom. Takođe, izvršeno je merenje zeta potencijala tečne komponente, diferencijalna skenirajuća kalorimetrija, skenirajuća elektronska mikroskopija i energetska disperzivna rentdenska analiza. Rezultati. Modul elastičnosti i čvrstoća bili su statistički značajno povećani dodatkom 0,05% nano-SiO₂. Povećanje sadržaja nanosilike na 1,5% nije doprinelo povećanju ispitivanih mehaničkih osobina, naprotiv. Osnovni razlog bio je pojava aglomeracije, pre mešanja praha i tečne komponente, dokazana merenjem zeta-potencijala, kao i nakon mešanja, a dokazana je skenirajućom elektronskom mikroskopijom i energetskom disperzivnom rendgenskom analizom. Zaključak. Najefikasniji sadržaj nanosilike za povećanje modula elastičnosti i čvrstoće autopolimerizovanog polimetilmetakrilata je 0,05 %.

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Savojna čvrstoća i modul elastičnosti autopolimerizovanog polimetilmetakrilata sa nanočesticama silicijum-dioksida

Sažetak

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