Introduction. Acrylic resin is a basic material used in preparation of partial and complete dentures. One of the methods of improving mechanical properties of removable dentures is reinforcing acrylic resin with artificial fibers. Aim of the study. To compare mechanical properties of acrylic material reinforced with various types of glass fibers. Material and method. Heat-cured Estetic acrylic resin by Wiedent was used for denture bases. Glass mat, fiberglass fabric, long glass fibers and short glass fibers were used as reinforcing phase of the acrylic resin. In total, forty specimens were prepared, of which eight samples were controls. Research samples consisted of four groups of eight specimens each. Mechanical examinations in three-point bending test were conducted by means of the Zwick 1435 universal testing machine. Results. Specimens reinforced with short glass fibers achieved the highest values of maximum bending force (105.7 ± 8.9 N). It corresponded to the highest values of bending strength (126.8 ± 10.7 MPa). The lowest strength was found for specimens reinforced with glass mat (82.8 ± 11.8 MPa). The highest value of Young’s modulus was obtained for the samples reinforced with fiberglass fabric (3.7 ± 0.8 GPa). The highest values of deflection at maximum bending force were found for the samples reinforced with long glass fibers (4.0 ± 0.6 mm). Conclusions. The highest bending strength parameters were found for specimens reinforced with short and long glass fibers. Short glass fibers are better at improving mechanical properties of acrylic resin than long glass fibers.

Strength parameters of dental photopolymer reinforced with long glass and aramid as well as aramid-glass hybrid fibers was to comparison. Static strength tests of 40 light-curing composite specimens were performed with the use of Zwick 1435 testing machine and testXpert V.8.1 software. Flexural strength of aramid fiber reinforced polymer increased nearly three times, whereas flexural strength of polymer reinforced with glass fiber-twice.

The purpose of the study was the comparison of poly(methyl methacrylate) reinforced with different types of long fibers: glass, carbon, aramid, glass-aramid hybrid and carbon-aramid hybrid fibers. The test material included 48 samples in the form of a cuboid. The strength tests were performed using the Zwick 1435 machine. The highest strength increase in relation to control samples was obtained with the use of aramid fibers and the lowest with the use of glass fibers.

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Pełne zrozumienie mechanizmu niszczenia próbek podczas obciążeń wytrzymałościowych wymaga wykonania niezbędnych szczegółowych analiz mikroskopowych. Umożliwiają one ocenę struktury materiałów oraz wad niewidocznych nieuzbrojonym okiem. Cel pracy. Ocena strukturalna próbek oraz ich przełomów przy użyciu mikroskopu cyfrowego oraz skaningowego mikroskopu elektronowego. Materiał i metody. Materiał do badań stanowiło łącznie 30 próbek poddanych testowi na zginanie trójpunktowe. Przeprowadzono obserwacje przy użyciu mikroskopu cyfrowego Keyence VHX-900F. Następnie wykonano obserwacje wyselekcjonowanych i reprezentatywnych przełomów próbek oraz ich zgładów przy użyciu Skaningowego Mikroskopu Elektronowego Hitachi TM 3000. Wyniki. Zjawiska widoczne na wykresach obrazujących zależność pomiędzy generowaną siłą a odkształceniem dla każdej z przeprowadzonych prób podczas testu na zginanie trójpunktowe zostały potwierdzone w obrazach mikroskopowych zniszczonych próbek. Zaobserwowano niedoskonałości połączenia włókien szklanych z kompozytem.