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    Wyświetlanie 1-4 z 4
    Tytuł:
    Microstructural and micromechanical tests of titanium biomaterials intended for prosthetic reconstructions
    Autorzy:
    Ryniewicz, A. M.
    Bojko, Ł.
    Ryniewicz, W. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/307469.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    CAD/CAM
    protetyka stomatologiczna
    DMLS
    mikrostruktura
    mikrotwardość
    tytan
    stop tytanu
    CAD/CAM system
    dental prosthetics
    direct metal laser sintering
    microstructure
    microhardness
    titanium
    titanium alloy
    Opis:
    Purpose: The aim of the present paper was a question of structural identification and evaluation of strength parameters of Titanium (Ticp – grade 2) and its alloy (Ti6Al4V) which are used to serve as a base for those permanent prosthetic supplements which are later manufactured employing CAD/CAM systems. Methods: Microstructural tests of Ticp and Ti6Al4V were conducted using an optical microscope as well as a scanning microscope. Hardness was measured with the Vickers method. Micromechanical properties of samples: microhardness and Young’s modulus value, were measured with the Oliver and Pharr method. Results: Based on studies using optical microscopy it was observed that the Ticp from the milling technology had a single phase, granular microstructure. The Ti64 alloy had a two-phase, fine-grained microstructure with an acicular-lamellar character. The results of scanning tests show that titanium Ticp had a single phase structure. On its grain there was visible acicular martensite. The structure of the two phase Ti64 alloy consists of a β matrix as well as released α phase deposits in the shape of extended needles. Micromechanical tests demonstrated that the alloy of Ti64 in both methods showed twice as high the microhardness as Ticp. In studies of Young’s modulus of Ti64 alloy DMLS technology have lower value than titanium milling technology. Conclusions: According to the results obtained, the following conclusion has been drawn: when strength aspect is discussed, the DMLS method is a preferred one in manufacturing load structures in dentistry and may be an alternate way for the CAD/CAM system used in decrement processing.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 1; 121-127
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The evaluation of the accuracy of shape imaging of prosthetic abutment
    Autorzy:
    Ryniewicz, W. I.
    Ryniewicz, A. M.
    Wiśniewska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/306759.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    filar protetyczny
    technika replik
    model numeryczny
    analiza 3D
    prosthetic abutment
    replica technique
    numerical models
    3D analysis
    shape errors
    Opis:
    Purpose: The aim of the study was the in vitro evaluation of the accuracy of shape imaging of abutment teeth using different impression compounds. Methods: To compare the accuracy of the shape of the numerically imaged real prosthetic abutments with the tested models of abutments obtained with the replica technique, the Geomagic Qualify program was applied. Making use of the licensed program Statistica, statistical analysis of the results obtained was conducted. Results: In the research procedures, analyses were conducted for 10 abutment premolars and 10 abutment molars. The tests allowed us to state that the dimensional accuracy of the models of prosthetic abutments obtained with the application of elastic compounds tested ensures comparable shape imaging. Conclusions: The objective method developed and applied here is suitable for controlling the imaging of the abutment teeth. The Geomagic Qualify program that was used during the research is a reliable tool of 3D analysis for the estimation of procedure of abutment tooth preparation and indication of an error of shape of prepared occlusal surface, lateral surface of abutment and errors of shaping the chamfer zone.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 2; 43-50
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The evaluation of the effect of carbon dioxide laser radiation on dentine tissue
    Autorzy:
    Ryniewicz, J.
    Ryniewicz, W. I.
    Loster, J. E.
    Wieczorek, A.
    Pytko-Polończyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/307408.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    mikrostruktura
    skaningowy mikroskop elektronowy
    SEM
    zębina
    microstructure
    scanning electron microscope
    dentine
    carbon dioxide laser
    Opis:
    Purpose: Tissue constitution and construction determine the scope of the structural changes that develop under laser light. The aim of this study was to analyze the effects of carbon dioxide (CO2) laser light on the structure and elemental composition of dentine. Methods: The evaluation was conducted on samples from extracted teeth. The surface of the dentine was exposed to the radiation from a CTL 1401 CO2 laser (Centre of Laser Technology, Poland). The radiation and frequency parameters were as follows: group I with 5 W and 1 Hz, group II with 10 W and 1 Hz, group III with 5 W and 5 Hz, and group IV with 10 W and 5 Hz. The altered dentine structure was macroscopically and microscopically evaluated using a Nova NanoSEM 200 Scanning Electron Microscope (FEI Europe) with integrated microanalysis X-ray system for elemental analysis in points. Results: There were significant differences between groups in the macro- and microstructure of laser defects. Conclusions: CO2 laser radiation causes irreversible, destructive changes in dentine. The structural dentine lesions developed under the influence of the CO2 laser radiation may hinder proper adhesion of bonding systems with the damaged tissue. Laser defects in the structure should be treated like defects of noncarious origin requiring preparation and filling with composite materials in accordance with the procedures.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 1; 181-188
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vascular plants of lempis nature reserve in the augustow forest (ne poland)
    Autorzy:
    Pawlikowski, P.
    Dembicz, I.
    Tyszkowski, M.
    Ryniewicz, J.
    Kozub, L.
    Czarnocka-Cieciura, M.
    Borzenski, P.
    Kasprzak, W.
    Galus, M.
    Fiederowicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/790545.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu
    Opis:
    During the survey of Łempis Nature Reserve (Augustów Forest, NE Poland) 353 species of vascular plants were recorded, including 32 considered threatened with extinction in Poland (7 species from the Polish “red data book” and 32 species from the Polish “red list”). Among them there were 41 species protected under the Polish law, including 19 strictly protected species and four species listed in the Annex II of the EU Habitats Directive. Ten orchid species were recorded, including the most valuable plants of the nature reserve – Cypripedium calceolus, Hammarbya paludosa, Liparis loeselii and Listera cordata. Among 32 noted Cyperaceae species (including 26 members of the Carex genus), there was a number of threatened plants, e.g. Baeothryon alpinum, Carex chordorrhiza, C. loliacea and Eriophorum gracile. Other rare species included Agrimonia pilosa, Cladium mariscus, Laserpitium latifolium, Linnaea borealis, Potamogeton gramineus and Pulsatilla patens. The presence of anthropophytes was significant (4.5% of the flora), probably due to the past forest management practices as well as proximity of settlements. The extremely rich flora, along with pristine wetland ecosystems (mesotrophic lakes, various mire forests and fens), places the Łempis Nature Reserve among the most valuable nature reserves in Poland.
    Źródło:
    Steciana; 2017, 21, 3
    1689-653X
    Pojawia się w:
    Steciana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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