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Short fiber reinforced composite for dental use: preparation and characterization
Henkrichová, Jana ; Přikryl, Radek (oponent) ; Poláček, Petr (vedoucí práce)
This diploma thesis studies short fiber reinforced composites for dental applications. Barium particulate filler, nanosilica and short glass and polyvinylalcohol fibers were added to the matrix consisting of four dimethacrylate types of monomers. The effect on material properties was observed. For characterization of different types of composite materials following methods were used: thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), three point bending test for notched and un-notched samples and scanning electron microscopy (SEM). Viscoelastic properties, modulus of elasticity and strength, critical values of stress intensity factor and strain energy release rate and polymerization shrinkage of composite materials were determined. It is possible to improve these properties of composite materials by adding short fibres to particulate reinforced composite. To make this modification more efficient, it is necessary to change surface treatment of fibres and preparation method of short fiber reinforced composites. Viscosity of material has raised after adding short fibers and processing of these types of dental material in dental laboratory is considered difficult to provide.
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Optimization of interfaces in long-fiber reinforced dental composites
Henkrichová, Jana ; Poláček, Petr (oponent) ; Přikryl, Radek (vedoucí práce)
This bachelor's thesis is dealing with study of fiber reinforced dental composites. Important properties of dental polymers, used fibers and options of their treatment were characterized. The aim of the thesis is to design the fiber surface modification by low temperature plasma to improve the adhesive bond strength and fracture characterization of the composite. The strength of the bond was tested by three point tensile tests by special device. Refractive characteristics and impact fibers wetting by matrix was determined by confocal microscopy.
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Analýza měsíčních teplotních časových řad na vybraných místech Evropy
Henkrichová, Jana ; Helman, Karel (vedoucí práce) ; Řezanková, Hana (oponent)
Bakalářská práce se zabývá analýzou teplotních měsíčních časových řad vybraných devíti meteorologických stanic na území Evropy v letech 1951-2015. Data byla čerpána z evropské databáze The European Climate Assessment & Dataset. Zeměpisné souřadnice vybraných meteorologických stanic tvoří pomyslnou mřížku na evropském kontinentu. Cílem této bakalářské práce je porovnat vývoj vybraných teplotních časových řad pomocí základních charakteristik časových řad, prozkoumat rozdílnosti těchto charakteristik vzhledem k zeměpisné poloze sledovaných stanic, pomocí statistických metod dospět k poznatkům o vývoji teplot v čase, se zaměřením na vývoj teplot v Praze - Klementinu. Dále prověřit míru závislosti teploty vzduchu na zeměpisné šířce, prověřit vliv kontinentality na podnebí a prověřit tvar rozdělení četností teplotních časových řad.
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Short fiber reinforced composite for dental use: preparation and characterization
Henkrichová, Jana ; Přikryl, Radek (oponent) ; Poláček, Petr (vedoucí práce)
This diploma thesis studies short fiber reinforced composites for dental applications. Barium particulate filler, nanosilica and short glass and polyvinylalcohol fibers were added to the matrix consisting of four dimethacrylate types of monomers. The effect on material properties was observed. For characterization of different types of composite materials following methods were used: thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), three point bending test for notched and un-notched samples and scanning electron microscopy (SEM). Viscoelastic properties, modulus of elasticity and strength, critical values of stress intensity factor and strain energy release rate and polymerization shrinkage of composite materials were determined. It is possible to improve these properties of composite materials by adding short fibres to particulate reinforced composite. To make this modification more efficient, it is necessary to change surface treatment of fibres and preparation method of short fiber reinforced composites. Viscosity of material has raised after adding short fibers and processing of these types of dental material in dental laboratory is considered difficult to provide.
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Optimization of interfaces in long-fiber reinforced dental composites
Henkrichová, Jana ; Poláček, Petr (oponent) ; Přikryl, Radek (vedoucí práce)
This bachelor's thesis is dealing with study of fiber reinforced dental composites. Important properties of dental polymers, used fibers and options of their treatment were characterized. The aim of the thesis is to design the fiber surface modification by low temperature plasma to improve the adhesive bond strength and fracture characterization of the composite. The strength of the bond was tested by three point tensile tests by special device. Refractive characteristics and impact fibers wetting by matrix was determined by confocal microscopy.
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