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    Wyświetlanie 1-15 z 15
    Tytuł:
    Znaczenie warunków podparcia i obciążenia w modelowych badaniach MES protez zębowych typu overdenture
    Importance of support and loading conditions in overdenture FEM model investigations
    Autorzy:
    Żmudzki, J.
    Chladek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/98749.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    protetyka stomatologiczna
    proteza zębowa
    MES (metoda elementów skończonych)
    żucie
    prosthodontics
    dental prosthesis
    FEM
    mastication
    Opis:
    W badaniach modelowych FEM protez overdenture założenie więzów ograniczających ruchomość protezy w sposób zgodny z zasadami ich funkcjonowania pozwala na rozpoznanie obciążeń złączy, przy znacznym uproszczeniu modelu numerycznego. Dla powszechnie dostępnych w sprzedaży typów złączy podczas transmisji sił żucia stwierdzono występowanie znacznych wartości obciążeń bocznych, co stanowi bezpośrednie wyjaśnienie przyczyn niepowodzeń mechanicznych. Założenie pionowych kierunków sił zgryzowych prowadzi do znacznego niedoszacowania obciążeń złączy.
    In overdenture FEM analysis, assumption of constrains reducing denture movement according to the rules of their functioning allows to determine loads of attachments, at the same time significantly simplifying numerical model. For commonly available types of attachments - during occlusal forces transmission found has been an occurrence of considerable lateral loads, which directly explains the causes of mechanical failures. Assumption of vertical occlusal forces directions leads to remarkable underestimating of attachments loads.
    Źródło:
    Aktualne Problemy Biomechaniki; 2009, 3; 239-245
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FEM numerical simulation of contact stresses between driving shaft and hub impeller of fuel pump
    Autorzy:
    Wiater, M.
    Chladek, G.
    Żmudzki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201038.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    fibre reinforcement composite
    fuel pump
    impeller
    shaft
    hub wear
    contact stress
    finite elements analysis
    FEA
    kompozyty wzmocnione włóknami
    pompa paliwa
    wirnik
    wał
    zużycie piasty
    naprężenia kontaktowe
    analiza elementów skończonych
    Opis:
    Purpose: The aim of the work was to test the contact stresses in the model system of the turbine hub cooperating with the fuel pump drive shaft. The hypothesis of the work was that, by means of FEA, it is possible to assess the contact stresses in the materials of the turbine hub and the fuel pump shaft during torque transmission. Design/methodology/approach: A turbine with fibre-reinforced polyphenylene sulphide (PPS) composite cooperating with a stainless steel shaft (X46Cr13/1.4034) in a commonly used D-flat shape joint was selected for the experimental research. To assess contact stresses, the CAD model (NX, Siemens) of the entire turbine was limited to the hub area. The drive shaft is supported in accordance with the bearing in the fuel pump, and the possibility of rotation about the axis along the length of the torque-producing magnet is taken away. The system was loaded with a torque of 200 Nmm on the turbine. The turbine hub and shaft were calculated, taking into account the phenomenon of contact detachment or slip at the value of the friction coefficient of 0.1. Findings: The pressure transmission area was found in the area at the edge of the flat surface D-flat and on the opposite side of the D-convexity. The contact stresses on the D-flat side reached values close to the composite strength. Research limitations/implications: The studies did not take into account the technological inaccuracies, thermal deformation, local material properties, and wear. The value of the friction coefficient was not measured in realistic conditions with fuel lubrication. Practical implications: FEA has been achieved, which allows to reduce the cost of experimental research. Originality/value: The proposed model allows for further studies of the influence of elasticity of various materials and structures on contact stresses in order to assess wear resistance.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 113, 1; 13--21
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The analysis of the effect of wrought wire clasps on the conditions of abutment teeth
    Autorzy:
    Kasperski, J
    Chladek, G.
    Płonka, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/307034.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    wrought wire clasp (WWC)
    wear
    removable partial denture
    spring constant
    zużycie zębów
    sprężyna wielokrotna
    wyjmowana proteza częściowa
    Opis:
    Laboratory evaluation of spring constants (k) of wrought wire clasps (WWC) separated from removable partial denture (RPD) and the results of tibological tests which represent the dependence of enamel wear with normal force have been presented in the paper. The results of laboratory examinations have been combined with the results of clinical assessment of the level of abutment teeth wear. On the basis of the examinations performed it has been revealed that the following factors have the greatest impact on tribological wear of abutment teeth: the time of using RPD and the normal force exerted by WWC on abutment tooth. Normal force depends to a great extent on the place of contact of WWC with the tooth. It has also been found that abutment teeth featuring higher scale of wear are more loosened. The diameter of wire used for making WWC, total length of the arm and k determined for the total length of the arm did not have any impact upon the scale of wear of abutment teeth.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 1; 27-33
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Full Contoured Tooth-Implant Supported 3-Pointic All-Ceramic Denture During Occlusal Load Transfer in Lateral Region
    Autorzy:
    Żmudzki, J.
    Malara, P.
    Chladek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/356267.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biomaterials
    denture
    zirconium oxide
    titanium implant
    bone tissue
    Opis:
    Implant and a tooth supported dentures are avoided by dentists because of uneven distribution of occlusal loads between a stiffer implant and a more pliable tooth. The hypothesis was that a 3-point all-ceramic bridge supported on a natural second premolar tooth and a two-pieces typical implant bears safely mastication loads. The finite element analysis showed that the implant splinted by all-ceramic zirconium bridge with the second premolar was safe under lateral mastication load, but there was found an overload at wide zone of bone tissue around the implant under the load of 800 N. The patients can safely masticate, but comminution of hard food should be avoided and they should be instructed that after such an indiscretion they need to contact a dental professional, because, in spite of integrity of the prosthesis, the bone tissue around the implant may fail and there is a hazard of intrusion of the tooth.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 843-846
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of silver-containing filler on antibacterial properties of experimental resin composites against Enterococcus faecalis
    Autorzy:
    Adeeb, S.
    Chladek, G.
    Pakieła, W.
    Mertas, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055745.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    resin composites
    Enterococcus faecalis
    antimicrobial properties
    silver
    dental restorative material
    dental materials
    kompozyty żywiczne
    paciorkowiec kałowy
    właściwości antybakteryjne
    srebro
    materiał do wypełnień dentystycznych
    materiały dentystyczne
    Opis:
    Purpose: The aim of the presented work was to investigate the impact of the S-P introduction into resin-based composites on their effectiveness against Enterococcus faecalis (E. faecalis). Design/methodology/approach: Seven experimental composites based on typical matrix were developed. Six of them contained a filler with antimicrobial properties (silver sodium hydrogen zirconium phosphate, S-P), while the control material contained only common reinforcement fillers. The materials were characterized in terms of the dispersion of the extender in the matrix and then subjected to microbiological tests. The efficiency in the reduction of E. faecalis in the microenvironment was tested. Findings: The composites show a satisfactory distribution of fillers and a high initial reduction of bacteria colonies for the tested strain of E. faecalis. The reduction in bacteria colonies achieved for S-P concentrations from 7% to 13% was similar (median value from 99.8 to 99.9%, when for control material and compound with 1% S-P the number of colonies increased compared to positive control. Research limitations/implications: Laboratory test results may differ from in vivo test performance. In addition, there are many models for conducting laboratory antimicrobial efficacy studies, the results of which are also varied. The cytotoxic tests, long-term investigations and in vivo experiments need to be performed in future experiments. Practical implications: E. faecalis is a Gram-positive bacterium that is commonly detected in persistent endodontic infections and may enter the root canal through the coronal part. Development of composites with antimicrobial properties against this bacterium is as important as obtaining efficacy against cariogenic bacteria. Originality/value: The antimicrobial effectiveness against E. faecalis of experimental composites with submicrometer-sized particles of S-P was not investigated until now.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2021, 109, 2; 59--67
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Process Parameters on the Microstructure and Properties SLM Processed 316L Stainless Steel
    Autorzy:
    Woźniak, A.
    Adamiak, M.
    Chladek, G.
    Kasperski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/351734.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SLM
    316L stainless steel
    corrosion test
    wettability
    Opis:
    Selective Laser Melting (SLM) is a modern manufacturing method with many applications in medicine, aerospace and auto-motive industries. SLM processed materials are characterized by good dimensional accuracy and properties comparable or superior to materials obtained by traditional processing methods. In this paper an SLM process was used to obtain 316L stainless steel parts. This paper presents the microstructure, chemical and phase composition, physicochemical and electrochemical properties of 12 groups of tested samples, differentiated by the SLM processing parameters. Based on the investigation, it can be inferred that the selection of the appropriate SLM parameters is very important to determined final material properties. The samples producedwith the energy density E = 600 J/mm3 were observed to possess optimum properties - a homogeneous structure, density closest to the desired one, good wettability and pitting corrosion resistance.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 73-80
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite Element Analysis Of Adolescent Mandible Fracture Occurring During Accidents
    Autorzy:
    Żmudzki, J.
    Chladek, G.
    Panek, K.
    Lipiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/352291.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mandible fracture
    disocclusion state
    finite element analysis
    critical blow force
    Opis:
    The paper aims was assessing risks of mandible fractures consequent to impacts or sport accidents. The role of the structural stiffness of mandible, related to disocclusion state, was evaluated using the finite element method. It has been assumed, that the quasi-static stress field, due to distributed forces developed during accidents, could explain the common types of mandibular fractures. Mandibular condyles were supposed jammed in the maxillary fossae. The force of 700 N, simulating an impact on mandible, has been sequentially applied in three distinct areas: centrally, at canine zone and at the mandibular angle. Clinically most frequent fractures of mandible were recognized through the analysis of maximal principal stress/strain fields. It has been shown that mandibular fracture during accidents can be analyzed at satisfactory level using linear quasi-static models for designing protections.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 65-72
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The novel semi-biodegradable interpenetrating polymer networks based on urethane-dimethacrylate and epoxy-polyester components as alternative biomaterials
    Autorzy:
    Barszczewska-Rybarek, I.
    Jaszcz, K.
    Jurczyk, S.
    Chladek, G
    Powiązania:
    https://bibliotekanauki.pl/articles/306686.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    analiza dynamiczno-mechaniczna
    materiał porowaty
    biodegradacja
    interpenetrating polymer networks
    urethane-dimethacrylates
    epoxy-polyesters
    dynamic mechanical analysis
    porous biomaterials
    biodegradation
    Opis:
    Purpose: This paper presents the pilot study aimed at the development of new full interpenetrating polymer networks based on urethane-dimethacrylate and biodegradable epoxy-polyester as the proposition of new biomaterials with gradually emerging porosity. Methods: The urethane-dimethacrylate monomer was obtained from 4,4’-methylenebis(phenyl isocyanate) and tetraethylene glycol monomethacrylate. The redox-initiating system was employed for its radical polymerization. The epoxy-polyester was produced by oxidation of the polyester, synthesized from succinic anhydride and allyl glicydyl ether. It was cured in a step-growth process with biogenic, aliphatic amine – spermidine. The mixtures of both monomers with adequate curing agents were room temperature polymerized. The hardened materials were characterized for damping behavior and dynamic modulus, hardness, water sorption, the course of hydrolytic degradation as well as the morphology – before and during the degradation process. Results: The cured materials revealed the nonporous, dense morphology. In the hydrolytic environment, the epoxy-polyester network degraded and the porous urethane-dimethacrylate scaffold remained. The epoxy-polyester appeared to prevent the urethane-dimethacrylate from attaining a high degree of conversion, even if the polymerization rate and the molecular mobility of the latter one are higher than those of the epoxy-polyester. The most homogeneous material with the best physico-mechanical properties was obtained when the urethane-dimethacrylate content was smaller than the epoxy-polyester content, respectively 25 and 50 wt%. Conclusions: The system presented in this work could be useful in tissue engineering, where at the beginning of the tissue regeneration process it would meet the implant mechanical properties and then would deliver its porosity, facilitating the tissue regeneration process.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 3; 13-22
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chewing efficiency and occlusal forces in PMMA, acetal and polyamide removable partial denture wearers
    Autorzy:
    Macura-Karbownik, A.
    Chladek, G.
    Żmudzki, J.
    Kasperski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/306359.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    materiał protetyczny
    wyjmowana proteza częściowa
    materiały termoplastyczne
    denture base material
    removable partial denture
    chewing efficiency
    occlusal force
    thermoplastic materials
    Opis:
    Purpose: Thermoplastic materials, such as acetal (AC) and polyamide (PA), constitute an alternative to polymethyl methacrylate (PMMA) based resins as the materials for removable partial dentures. However, none of the previous studies compared chewing efficiency and occlusal forces in the wearers of dentures made of various materials. Therefore, the aim of this study was to determine and compare the chewing efficiency and occlusal forces in PMMA, PA and AC RPDs’ wearers. The hypothesis was that the type of denture base material shows a significant effect on chewing efficiency (expressed as a degree of food fragmentation) and occlusal force. Methods: The experiment included the group of 30 patients using removable partial dentures. The dentures made of PMMA, acetal and polyamide were tested in each patient. Each denture was worn for 90 days, with a random sequence of the denture manufacturing and insertion. After 7, 30 and 90 days of each denture wear, chewing efficiency coefficient was determined with the aid of a sieving method, and occlusal force was measured with a dynamometer. Results: The use of dentures made of PMMA or acetal was reflected by a marked increase in chewing efficiency and occlusal force. None of these parameters changed significantly with the time of denture wear. Moreover, no significant correlation was found between chewing efficiency and occlusal forces. Conclusions: Denture base material exerts significant effects on the degree of food fragmentation and the level of occlusal forces. The use of dentures and clasps made of materials with lower modulus of elasticity is associated with lower chewing efficiency and lower occlusal forces.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 1; 137-144
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of magnetostimulation on muscle activity and pain in edentulous adults with temporomandibular disorders
    Autorzy:
    Rój, R.
    Chladek, G.
    Wyszyńska, M.
    Morawiec, T.
    Kasperski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/307170.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    elektromiografia
    terapia polem magnetycznym
    fizykoterapia
    temporomandibular disorders
    electromyography
    magnetic field therapy
    Opis:
    Introduction: Multifactorial aetiologies of painful temporomandibular disorders (TMD) have an impact on correct diagnosis and consequently prevent proper treatment. Aim of the study: The aim of the study was to evaluate the effect of magnetic stimulation on electromyographic activity in temporal muscles and masseters in patients using occlusal splints. Materials and methods: The examined group consisted of 40 edentulous patients with TMD. The patients were examined based on Helkimo Index. Next, electromyographic activity of the temporal muscle and masseter were investigated using 8-channel surface electromyography. All patients received acrylic occlusal splints for 12 weeks. The group qualified for the study included 20 randomized patients, whose therapy was additionally carried out by extremely low-frequency magnetic fields for a period of 21 days. Following examinations were conducted after 3, 6 and 12 weeks with surface electromyography recording of the examined muscles. Patients received occlusal splint corrections using the T-Scan III system. The clinical evaluation of TMD was analysed using Helkimo index and VAS scale before and after the treatment. All the data were analysed using Statistica 12.5 PL. Results: Patients with combination therapy had lower asymmetry of temporal muscle activity. Conclusions: Combination therapy using magnetic stimulation reduced intensity of pain in patients with TMD and decreased values of the Helkimo indices.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 2; 89-99
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Atomic Layer Deposition of ZrO2 on the Physicochemical Properties of Cobalt based Alloys Intended for Prosthetic Dentistry
    Autorzy:
    Ziębowicz, A.
    Woźniak, A.
    Ziębowicz, B.
    Kosiel, K.
    Chladek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/355640.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cobalt alloy
    ZrO2 layer
    SFE
    corrosion
    artificial saliva
    Opis:
    The paper presents the effect of ZrO2 layer deposition by the ALD process on the physicochemical properties of cobalt-based alloys (Realloy C and EOS CoCr SP2) intended for application in prosthetic dentistry. The paper shows the results of the surface roughness measurements made by the AFM method as well as the wettability and free surface energy measurements. Additionally, potentiodynamic tests of pitting corrosion resistance and electrochemical impedance spectroscopy in a solution of artificial saliva were carried out. Tests were carried out on the samples in the initial state and after surface modification with the ZrO2 layer. Based on these results, the usefulness (e.g. enhancement of corrosion resistance and biocompatibility) of the proposed ZrO2 layer on the cobalt alloys was assessed.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1077-1082
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Chemical Composition on the Properties of Experimental Silicone-Based Soft Lining Composites
    Autorzy:
    Jabłońska-Stencel, E.
    Pakieła, W.
    Żmudzki, J.
    Kasperski, J.
    Chladek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/355272.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dental material
    soft lining
    silicone
    silica filler
    mechanical properties
    Opis:
    The paper analyses the influence of chemical composition of silicone-based composites on their properties in the aspect of using them as long-term soft denture lining materials. Different concentrations of filler and methylhydrosiloxane-dimethylsiloxane copolymer were used. The filler was introduced into the composite with mechanical mixing combined with ultrasonic homogenization. Scanning electron microscopy was used to investigate the quality of filler dispersion. Shore A hardness, tensile strength, sorption, solubility and tensile bond strength to poly(methyl methacrylate) were measured. Tests show satisfactory results for some experimental composites, which met all the requirements for such materials.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1371-1377
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    DMA analysis of the structure of crosslinked poly(methyl methacrylate)s
    Autorzy:
    Barszczewska-Rybarek, I. M.
    Korytkowska-Wałach, A.
    Kurcok, M.
    Chladek, G.
    Kasperski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/307446.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    PMMA
    moduł sprężystości
    DMA
    parametry sieciowe
    corosslink density
    network parameters
    storage modulus
    glass temperature
    Opis:
    Purpose: This paper presents the study aimed at the development of crosslinked poly(methyl methacrylate)s (X-PMMA) of varied crosslink density and the investigation of the relationships between the polymer network structure and dynamic mechanical properties. Methods: A series of model X-PMMA networks were crosslinked by the introduction of: 1, 2, 5, 10 and 20% of triethylene glycol dimethacrylate (TEGDMA). The copolymerizations led to various glass-rubber relaxation properties of the polymer networks, as revealed by dynamic-mechanical analysis (DMA). Glass temperature (Tg) and storage modulus above the Tg ( ) Erubbery were a sensitive function of network architecture. DMA data were used for calculating the network parameter (Mc), crosslink density (q) and its alternative measure – the degree of crosslinking (DX). Results: The viscoelastic properties as well as structural parameters calculated from those showed correlation with the amount of the crosslinker. The increase in TEGDMA content resulted in the Tg, q and DX increases, whereas Mc decrease. The possible incomplete conversion of double bonds was detected in the DMA analysis, which was confirmed by the degree of conversion (DC), measured by FTIR spectroscopy. Additionally, some amount of sol fraction was found by 1H NMR experiments. Conclusions: The structure-property relationships developed for the system presented in this work could be useful in tissue engineering, where X-PMMA is applied. The direct measure of storage modulus values before and above glass transition may serve as a simple and fast indicator of the X-PMMA crosslink density.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 1; 47-53
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of aging solutions on wear resistance and hardness of selected resin-based dental composites
    Autorzy:
    Chladek, G.
    Basa, K.
    Żmudzki, J.
    Malara, P.
    Nowak, A. J.
    Kasperski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/306782.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    właściwości
    mikrotwardość
    kompozyty stomatologiczne
    tarcie
    test
    properties
    microhardness
    dental composite
    friction
    wear test
    aging solution
    Opis:
    Purpose: The purpose of this study was to investigate the effect of different plasticizing aging solutions on wear resistance and hardness of selected universal resin-based dental composites. Methods: Three light cured (one nanofilled, two microhybride) and one hybride chemical cured composites were aged at 37 °C for 48 h in distillated water, ethyl alcohol solution or Listerine mouthwash. After aging the microhardness tests were carried out and then tribological tests were performed in the presence of aging solution at 37 °C. During wear testing coefficients of friction were determined. The maximal vertical loss in micrometers was determined with profilometer. Results: Aging in all liquids resulted in a significant decrease in hardness of the test materials, with the largest values obtained successively in ethanol solution, mouthwash and water. The effect of the liquid was dependent on the particular material, but not the type of material (interpreted as the size of filler used). Introduction of mouthwash instead of water or ethanol solution resulted in a significant reduction in the coefficient of friction. The lowest wear resistance was registered after aging in ethanol and for the chemical cured hybrid composite, but the vertical loss was strongly material dependent. Conclusions: The effect of different aging solution, including commercial mouthrinse, on hardness and wear was material dependent, and cannot be deduced from their category or filler loading. There is no simple correlation between hardness of resin-based dental composites and their wear resistance, but softening of particular composites materials during aging leads to the reduction of its wear resistance.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 3; 43-52
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Different Inorganic Fillers on Mechanical Properties and Degree of Conversion of Dental Resin Composites
    Autorzy:
    Stencel, R.
    Pakieła, W.
    Barszczewska-Rybarek, I.
    Żmudzki, J.
    Kasperski, J.
    Chladek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/352485.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    resin composites
    dental materials
    filler
    mechanical properties
    degree of conversion
    Opis:
    The aim of the study was to evaluate the influence of different fillers on the chosen functional properties of experimental composites based on typical polymeric matrix, in order to understand the effect of different fillers on their properties and to develop a simple base composite for further investigations with experimental fillers, e.g. with antimicrobial properties. Previous experiments have been usually based on commercially available composites of unknown composition or compilation of monomers, without reinforcing fillers. Scanning electron microscopy was used to investigate the quality of fillers’ dispersion, which was satisfying. Results showed significant differences between materials’ diametral tensile strength (p = 0.0019), compressive strength (p < 0.0001), Vickers microhardness (p < 0.0001), flexural modules (p = 0.0018), and the degree of conversion (p < 0.0001), but flexural strength was not significantly different (p = 0.0583). Investigations indicated that no filler type had an especially positive impact on the mechanical properties, but reinforcement effect was achieved by proper compilation of silica nanofiller and variable glass fillers. Nanofiller decreased the degree of conversion.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1361-1369
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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