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    Wyświetlanie 1-7 z 7
    Tytuł:
    Early Frasnian acanthodians from Central Iran
    Autorzy:
    Hairapetian, V.
    Valiukevicius, J.
    Burrow, C.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/20209.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Acanthodii
    Central Iran
    Climatiidae
    dental element
    Diplacanthidae
    Early Frasnian
    Frasnian
    Iran
    Ischnacanthiformes
    acanthodian
    paleontology
    histology
    Devonian
    systematics
    Opis:
    Two vertebrate−bearing horizons in the basal Frasnian carbonate of the Chahriseh section, northeast of Esfahan, yielded microremains of thelodonts, placoderms, acanthodians, actinopterygians, chondrichthyans, and sarcopterygians, considerably expanding the vertebrate faunal list for the strata. Acanthodians comprise a diverse association of climatiids, diplacanthids, and ischnacanthiforms, including the previously recorded climatiid Nostolepis sp. cf. N. gaujensis, as well as one new climatiid genus and several taxa left in open nomenclature. Climatiid Iranolepis ginteri gen. et sp. nov. is diagnosed by having scales with a highly raised medial crown area separated by steep slopes from lateral crown areas; an odontocytic mesodentine of maximum extent in the crown, distinguished by extensive network of fine canaliculi with abundant tiny osteocytes; and a poorly developed stranggewebe system. Other scales with fan−like symmetrically grooved crowns conform to the Diplacanthus−type histologically, and have many characters in common with Milesacanthus antarctica from the Aztec Siltstone of Antarctica. Osseous gnathal elements include mesodentinous tooth whorls from an ischnacanthiform or climatiid, and ischnacanthiform jaw bones with large chambers for vascular canals, distinctly separated cylindrical tooth cusps along the lingual ridge, and wide−based, triangular, weakly striated cusps on the main lateral ridge. The acanthodian association, accompanied by the Frasnian conodonts of the middle Mesotaxis falsiovalis to Palmatolepis hassi zones and zonal thelodonts Turinia hutkensis and Australolepis seddoni, is proving useful for biostratigraphy, showing similarities with assemblages from both Gondwana and the Old Red Sandstone Continent.
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The never-ending problem of Miocene beaver taxonomy
    Autorzy:
    Casanovas-Vilar, I.
    Alba, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/21450.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Chalicomys jaegeri
    Miocene
    Steneofiber depereti
    beaver
    dental element
    distinction
    locality
    measurement
    paleontology
    rodent
    small size
    species stand
    taxonomy
    tooth
    Opis:
    The finds of Miocene beavers are not rare at all. Nevertheless, in most localities these rodents are only represented by a few dental elements, so that large collections are only occasionally available to researchers. Hence, the description of sufficiently large samples, such as the recently published description of Steneofiber depereti from Hambach 6C (NW Germany, MN5) by Mörs and Stefen (2010), deserves the greatest attention. After a comprehensive description and comparison of the material, these authors conclude that previous citations of the beaver Chalicomys jaegeri from the MN4 to MN6 (early to middle Miocene) are misidentifications of the genus Steneofiber. Following Stefen (2009), these authors further question the validity of all the known Chalicomys species from the later middle Miocene (MN7+8). We agree with these authors that the occurrence of C. jaegeri in the middle Miocene is doubtful, but we disagree with their arguments for the synonymization of several species. Here we address this point and discuss the taxonomic criteria for distinguishing both genera, further reviewing the taxonomy of the genus Chalicomys at the species level.
    Źródło:
    Acta Palaeontologica Polonica; 2011, 56, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie metody elementów skończonych (MES) do wybranych zagadnień w projektowaniu tytanowo-ceramicznych koron protetycznych
    Finite element method (FEM) implementation in some chosen areas in dental tytanium-ceramic crown design
    Autorzy:
    Rymkiewicz, S.
    Bereznowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/285722.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    metoda elementów skończonych
    korony stomatologiczne
    finite element method
    dental crowns
    Źródło:
    Engineering of Biomaterials; 2007, 10, no. 69-72; 62-64
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical complexity of selected biomechanical problems
    Numeryczna złożoność wybranych problemów biomechaniki
    Autorzy:
    Wierszycki, M.
    Kąkol, W.
    Łodygowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/280688.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    biomechanika
    trwałość implantów
    sztywność segmentów kręgosłupa
    biomechanical
    finite element method
    fatigue analysis
    dental implant
    spine segment
    Opis:
    The paper describes various aspects of numerical modeling of biomechanical problems by the finite element method. The authors would like to present what they mean by the numerical complexity of modeling of biomechanical problems. The attention is focused on numerical simulation of dental implants and human lumbar spine motion segment (L4-L5). In both cases, acquisition and creation of geometry, number of DOFs, combining different types of elements, properties of the material, contact definitions, loads and boundary conditions are difficult tasks. The acquisition of geometric data of living body parts can be realized only by using noninvasive techniques like NMR or CT. The processing of these data requires specialized software and methods. The methodologies of defining mechanical parameters of human tissues are usually inaccurate and have to be used in practice on living people very carefully. The constitutive data in literature are usually grossly inconsistent. In numerical simulations, custom material formulations and modeling techniques should be used. It is difficult to describe real-world loads and boundary conditions since both are very complex and changing. Load scheme models are global and force values are very difficult to obtain. Boundary conditions are necessarily very simplified but they should reflect specific biological behaviors and conditions. Nevertheless, the numerical simulation by means of the finite element method can be helpful and useful during solving biomechanical problems like fatigue analysis of dental implants or estimating the stiffness of human lumbar spine segment.
    Praca opisuje wybrane aspekty modelowania numerycznego z wykorzystaniem Metody Elementów Skończonych (MES) zagadnień biomechaniki. Autorzy starają się podkreślić złożoność takiej analizy MES. Uwagę skupiono na dwóch przykładach: analizie wszczepu stomatologicznego oraz ruchomości segmentu kręgosłupa ludzkiego (L4-L5). W obu analizowanych i modelowanych przypadkach odtworzenie geometrii, liczba typów elementów i stopni swobody modeli, przyjęcie modeli i właściwości konstytutywnych materiałów biologicznych, definicje problemów kontaktowych czy warunków początkowo-brzegowych stanowią o poziomie trudności podejmowanych zadań. Pokonanie wymienionych trudności, a co za tym idzie zbudowanie modeli numerycznych odtwarzających zachowanie się rzeczywistych elementów biomechanicznych jest przedmiotem podejmowanej w pracy dyskusji. Pomimo tej złożonościzadań, zastosowanie MES do oceny zachowania się implantów bądź segmentu ruchowego prowadzi do wystarczająco zgodnej z eksperymentem oceny trwałości implantów lub sztywności segmentów kręgosłupa.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2006, 44, 4; 797-818
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical response at peri-implant mandibular bone for variation of pore characteristics of implants: A Finite Element Study
    Autorzy:
    Sarkar, Sulagna
    Sahu, Tikeshwar Prasad
    Datta, Arijit
    Chandra, Nimesh
    Chakraborty, Arindam
    Datta, Pallab
    Majumder, Santanu
    Chowdhury, Amit Roy
    Powiązania:
    https://bibliotekanauki.pl/articles/307131.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    implant stomatologiczny
    uszczelnianie
    FEM
    porous dental implant
    pore size
    percentage porosity
    bone-implant interface
    finite element analysis
    stress and strain
    Opis:
    In this paper, the mechanical response of generic dental implants having calculated porosities with varying pore-sizes has been evaluated. The purpose of this study was to compare the developed stress-strain of designed porous implants (i.e., stress at the implant and strain at the peri-implant bone) with that of the non-porous implant. Methods: 3D model of a mandible was prepared from CT scan data and nine generic dental implant models have been designed having 10%, 20%, and 30% porosity with 500, 700, and 900 micron pore size along with a non-porous model for carrying out FE analyses. First, failure analyses of implants, under a biting force of 250 N have been performed. Next, the remaining implants have been further evaluated under average compressive chewing load of 100 N, for mechanical responses at bone-implant interface. Results: Von Mises strain at the peri-implant mandibular bone increases with the increase in percentage porosity of the implant material and maximum implant stress remained much below the yield stress level. Conclusion: Implant stiffness and compressive strength vary as a function of porosity and pore size. Strain obtained on the peri-implant bone is sufficient enough to facilitate better bone growth with the 700 micron pore size and 30% porosity, thus reducing the effect of stress shielding.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 2; 83-93
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue life of polymer dental crown
    Autorzy:
    Michalski, J.
    Stręk, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/127698.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    fatigue
    modal
    vibrations
    dental crown
    polymers
    acrylic
    finite element method
    zmęczenie materiału
    modalność
    drgania
    korona protetyczna
    polimery
    akryl
    metoda elementów skończonych
    Opis:
    In this article fatigue life of polymer dental crown will be analyzed. Chewing forces occurring in repetitive cycles can lead to fatigue destruction of material. To predict a number of cycles to failure finite element method can be applied and results may be used to improve the design of acrylic dental crowns. Also, the modal analysis will be performed in order to find natural frequencies of the system and prevent destruction from vibrations.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-8
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite element analysis of the impact of the properties of dental wedge materials on functional features
    Autorzy:
    Czerwiński, M.
    Żmudzki, J.
    Kwieciński, K.
    Kowalczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2175745.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    dental wedge material
    friction
    matrix
    filling
    seal
    finite element analysis (FEA)
    pressure
    materiał klina dentystycznego
    tarcie
    matryca
    wypełnienie
    uszczelnienie
    analiza elementów skończonych
    ciśnienie
    Opis:
    Purpose: Defect of the interproximal wall of the tooth is filled with use the shaped matrix and wedge which seals bottom margin during filling. Better fit of the wedge and equalization of the pressure forces on the matrix is achieved by the compliance of the wedge structure through cuts and perforations and the use of silicone materials and unidirectionally expanded polytetrafluoroethylene (ePTFE). The work presents a methodology for model studies of the mechanics of dental wedges in order to evaluate and compare the impact of wedge materials on functional features. The hypothesis of the work was that the mechanical properties of ePTFE determine the effectiveness of the dental wedge. Design/methodology/approach: Effect of modulus of elasticity and friction coefficient of wedge and matrix materials on the functional features of the wedge was studied on the way Finite Element Analysis (FEA). Simulation included contact sliding between wedge and matrix what was simulated in nonlinear large displacements regime. The sealing evaluation criterion was the pressure distribution between the wedge and matrix below the lower edge of the defect. Displacement values were the criterion for the loss of convexity as a result of matrix deformation. Findings: The material for the wedge should be characterized by a low coefficient of friction, low elasticity (ensuring high compliance of the wedge) and at the same time the ability to large permanent deformations, which allows for plastic shaping of the matrix from the side of the defect in order to achieve the required wall convexity and the tangent point. Research limitations/implications: Results show tendency of phenomena in limitation to model simplification of the interdental gap and the ideal adhesion of the matrix to the tooth and linear elasticity of materials. Practical implications: The material that best meets the requirements is unidirectionally expanded polytetrafluoroethylene, which has one of the lowest coefficients of friction and very high plasticity necessary to shape the matrix from the inside of the cavity. Originality/value: Methodology of model study and criteria of functional characteristics of dental wedge was presented.
    Źródło:
    Archives of Materials Science and Engineering; 2021, 112, 1; 32--41
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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