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Tytuł:
Modelowa analiza MES wpływu silikonów podścielających protezy zębowe na redystrybucję obciążeń w tkankach miękkich podłoża protetycznego
FEM model analysis of dentures silicon relining influence on the stresses redistribution in denture foundation soft tissues
Autorzy:
Żmudzki, J.
Powiązania:
https://bibliotekanauki.pl/articles/99337.pdf
Data publikacji:
2009
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Tematy:
protetyka stomatologiczna
proteza zębowa
MES (metoda elementów skończonych)
uraz
prosthodontics
dental prosthesis
FEM
injury
Opis:
Urazy i odczucia dyskomfortu bólowego podczas użytkowania protez zębowych mogą powstawać w wyniku przekroczenia tolerancji tkanki zarówno na ciśnienie jak i ścinanie, których maksymalne wartości na drodze badań MES zlokalizowano we wzajemnie odległych obszarach. Wprowadzenie silikonowego podścielenia protezy skutkuje zmniejszeniem maksymalnych wartości nacisków i ich wyrównaniem na powierzchni przylegania. Jednak przeniesienie części nacisków na stoki bezzębnych wyrostków skutkuje zwiększeniem ścinania przy kości pod powierzchnią tkanki miękkiej.
Injuries and discomfort of pain sensations during wearing of dentures might result from exceeding tissue tolerances both as far as pressure and shear are concerned. Their maximum values determined by means of FEM analysis were located in opposite areas. Introducing silicone denture relining results in reduction of maximum compression values and their balance on adherence interface. Nevertheless, relocation of part of the compression forces on slopes of edentulous ridges causes increase of shear at the bone under surface of soft tissues.
Źródło:
Aktualne Problemy Biomechaniki; 2009, 3; 233-238
1898-763X
Pojawia się w:
Aktualne Problemy Biomechaniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of forces on supporting teeth in the midpalatal expander during “Hyrax” screw pre-load
Autorzy:
Młynarek, K.
Żmudzki, J.
Powiązania:
https://bibliotekanauki.pl/articles/366987.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
rapid palatal expansion
Hyrax screw pre-load
stress
displacement
finite elements analysis
FEA
szybka ekspansja podniebienia
naprężenie
przemieszczenie
analiza elementów skończonych
Opis:
Purpose: The aim of the study was to determine forces which are transferred to supporting teeth during the treatment with the midpalatal device with Hyrax screw and to evaluate orthodontic and orthopaedic effects based on displacement analysis. Design/methodology/approach: The finite element method (FEM) was used to simulation the midpalatal expansion forces activated by the screw pre-loaded during a turn of 180° which corresponds to daily recommended value. Distribution of expansion forces of Hyrax device was calculated as reaction forces on elastic supports with stiffness corresponding to the teeth working on periodontal ligament in alveolar bone. Findings: On the basis of the displacement analysis was observed the movement of supporting teeth by a value higher than 0.1 mm which corresponds to the recommended daily value. The midpalatal suture splitting forces were determined on the first premolars with a value of 32.8 N and on the first premolars of 44.2 N. Research limitations/implications: The studies did not take into account the shape of palate other craniofacial bones and their stiffness. Practical implications: Adjusting the stiffness of the device to degree of ossification midpalatal suture and teeth mobility. Searching for new solutions which eliminate the negative phenomenon of tilting teeth during the expansion of maxilla and recommending a surgically assisted techniques. Originality/value: The simulation confirmed that treatment with Hyrax screw gives a uniform expansion with values of forces corresponded to stiffness of premolar and molar teeth. The studies have indicated a possibility of tendency to tilting the supporting teeth what is a negative phenomenon.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2019, 93, 1-2; 26-31
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FEA of displacements and stresses of aortic heart valve leaflets during the opening phase
Autorzy:
Bialas, O.
Żmudzki, J.
Powiązania:
https://bibliotekanauki.pl/articles/368153.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
heart valve
aortic valve
leaflet material
FEA
simulation
zastawka serca
zastawka aortalna
analiza elementów skończonych
symulacja komputerowa
Opis:
Purpose: Modelling of biomechanical behaviour of heart valve materials aids improvement of biofunctional feature. The aim of the work was assessment of influence of material thickness of leaflets of artificial aortic valve on displacements and stresses during opening phase using finite element analysis (FEA). Design/methodology/approach: The model of aortic valve was developed on the basis of average anatomical valve shapes and dimensions. Nonlinear dynamic large displacements analysis with assumption of isotropic linear elastic material behaviour was used in simulation (Solidworks). The modulus of elasticity of 5.0 MPa was assumed and Poisson ratio set to 0.45. The rigidly supported leaflets was loaded by pressure increasing in the range 0-55 mmHg in time 0.1 s. Leaflets with material thickness 0.13 and 0.15 and 0.17 mm were analysed. The thickness was simulated with shell finite elements. Findings: The highest stresses were observed in the areas of fixation of the leaflets near the scaffold and were lower than dangerous value of fatigue of polyurethanes. Increasing the thickness of valve leaflet material in the range of 40 micrometres resulted in reduction of the valve outlet by almost 10 percent. Research limitations/implications: The FEA was limited to the isotropic linear-elastic behaviour of the material albeit can be used to assess leaflet deformation during dynamic load. Practical implications: Leaflets design may be start from efficient FEA which helps estimation of material impact on stress and fold formation which can affect local blood flow. Originality/value: Aortic heart valve leaflet material can be initially tested in dynamic conditions during opening phase with using FEA.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2019, 92, 1-2; 29-35
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Dwadzieścia lat badań kontrolnych pozostałości chemicznych w tkankach zwierząt i żywności pochodzenia zwierzęcego prowadzonych w Polsce według dyrektywy Rady 96/23/EC
Twenty years of monitoring of chemical residues in animal tissues and in food of animal origin carried out in Poland by the Council Directive 96/23/EC
Autorzy:
Posyniak, A.
Zmudzki, J.
Powiązania:
https://bibliotekanauki.pl/articles/858769.pdf
Data publikacji:
2017
Wydawca:
Krajowa Izba Lekarsko-Weterynaryjna
Źródło:
Życie Weterynaryjne; 2017, 92, 04
0137-6810
Pojawia się w:
Życie Weterynaryjne
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:
Assessment of gold with titanium alloy weldability in conditions of a dental technique laboratory
Autorzy:
Jania, G.
Żmudzki, J.
Topolska, S.
Powiązania:
https://bibliotekanauki.pl/articles/24200598.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
titanium alloy
gold
laser welding
prosthetic
implant denture
microstructure
stop tytanu
złoto
spawanie laserowe
protetyka
proteza implantu
mikrostruktura
Opis:
Purpose: In dental practice, there is necessary to weld gold with titanium under the conditions of a dental technique laboratory, which is difficult. The aim was to assess the weldability of pure gold with the titanium alloy Ti6Al4V using a prosthetic laser welding machine. Design/methodology/approach: Gold wire in a diameter of 0.4 mm made with the use of a jewellery drawbar (GOLDPORT, Szczecin, Poland) was welded to a titanium alloy Ti6Al4V substrate of dental implant abutment screw (MegaGen). Dental laser welding parameters (Bego Laser Star T plus) were 230 V; 6.5 ms; 2.5 Hz; laser spot 0.3 mm, and argon blow. Samples were included in resin, ground (500-4000 SiC), polished (Al2O3 suspension) and etched (Kroll solution) per 20 s before observation under a light microscope. Findings: There were well-welded and poorly joined zones. The discontinuities and voids there were not visible or sparse next to the initial weld point. Dendritic structure at well-welded remelting zones and two-phase microstructure of titanium and Ti3Au phase were found. The heat-affected zone was about of 20 microns. Research limitations/implications: Light microscopy was used, and precise phase identification required further investigations. Weld strength assessment requires further micro-hardness and load-bearing ability tests. Weldability concerns the model system with pure gold. Practical implications: In the case of elements with dimensions below 0.4 mm, the use of a laser with a smaller spot should be considered for better control of the remelting zone and mechanical positioning of the elements in order to stabilize and avoid discontinuities and voids. Originality/value: Prosthetic laser welding with a laser spot about of 0.3 mm allows to obtain well-welded parts of 0.3 mm in diameter under stable stitching conditions and higher than 0.4 mm in dimensions.
Źródło:
Archives of Materials Science and Engineering; 2022, 118, 1; 36--41
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Residues of veterinary medicinal products and coccidiostats in eggs – causes, control and results of surveillance program in Poland
Autorzy:
Piatkowska, M.
Jedziniak, P.
Zmudzki, J.
Powiązania:
https://bibliotekanauki.pl/articles/31591.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The use of veterinary medicinal products in food producing animals for a variety of purposes causes that their residues may be presented in edible tissues. As a result, in concern of public health, European Union Countries establish each year monitoring plans and they control the levels of harmful substances in food of animal origin. This paper presents survey of residues of veterinary medicinal products and coccidiostats in eggs for Poland and European Union in years 2007-2010. Despite the decrease in reported non-compliant results for coccidiostats, the numbers were still higher than those for veterinary medicines. The most often determined coccidiostats were: nicarbazin, dinitrocarbanilide, salinomycin and lasalocid, and the most often reported non-compliant results for veterinary medicines were: antimicrobials, enrofloxacin and doxycycline.
Źródło:
Polish Journal of Veterinary Sciences; 2012, 15, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strength analysis of a three-unit dental bridge framework with the Finite Element Method
Autorzy:
Reimann, Ł.
Żmudzki, J.
Dobrzański, L.
Powiązania:
https://bibliotekanauki.pl/articles/306361.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
materiały stomatologiczne
mostek
dobór materiałów
dental bridge
Huber-Mises stress
connector
materials selection
Opis:
Purpose: The aim of the study was to analyse the strength of a prosthetic bridge with variable geometry in the connectors between the span and the retention elements on the pillar teeth crowns. Methods: Research was carried using the Finite Elements Method (FEM) on a model of the bridge in the anterior teeth arch in the field 21–22–23, obtained using a contact scanner and computer aided design (CAD) system, with four different cross-sectional areas of the connectors: 4.0, 5.0, 5.5, and 6.0 mm2. For that purpose, the impact of the properties of selected metal alloys on the deflection of the prosthesis was analysed. Results: On the basis of the analyses, it was found that when the loading force acted obliquely, the stress was 19% higher compared to the stress with a loading vertical force. In the case of connectors with the smallest cross-sectional area, the stress exceeded permissible value (with safety factor n = 2) for one of the alloys. Conclusions: Deflection of the bridges tested changed depending on the connector cross-section and the elastic modulus of the selected material.
Źródło:
Acta of Bioengineering and Biomechanics; 2015, 17, 1; 51-59
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:
The effect of selected environmental Fusarium mycotoxins on the ovaries in the female wild boar (Sus scrofa)
Autorzy:
Zielonka, L.
Gajecka, M.
Zmudzki, J.
Gajecki, M.
Powiązania:
https://bibliotekanauki.pl/articles/31466.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The contamination of agricultural crops with Fusarium mycotoxins poses one of the greatest problems in food production. Wild boars live in specific habitats and are physiologically sensitive to Fusarium mycotoxins, therefore, they are an interesting model for studies investigating the effects of the discussed toxin, in particular under low-dose exposure. The objective of this study was to determine potential effects of Fusarium mycotoxins ingested with naturally contaminated food on reproductive function based on the proliferation and apoptotic indices of ovarian follicles in female wild boars. The experiment was conducted on 40 wild boars inhabiting north-eastern Poland. The effect of seasonal variations in the quantity and quality of ingested food on the concentrations of Fusarium mycotoxins and their metabolites in the blood of wild boars was analyzed. The observed differences in toxin levels were accompanied by changes in proliferation and apoptotic indices. Proliferation processes were most intense in autumn-winter and were least advanced in winter-spring. The intensity of apoptotic processes was inversely correlated with proliferation.
Źródło:
Polish Journal of Veterinary Sciences; 2015, 18, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
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
Tytuł:
Wpływ optymalnego (flushing) żywienia loch w okresie okołoodsadzeniowym na poprawę wskaźników produkcyjnych
The effect of optimal (flushing) feeding of sows on improving production parameters during the post weaning period
Autorzy:
Porowski, M.
Wojciechowski, J.
Rozinski, T.
Zmudzki, J.
Powiązania:
https://bibliotekanauki.pl/articles/860185.pdf
Data publikacji:
2016
Wydawca:
Krajowa Izba Lekarsko-Weterynaryjna
Źródło:
Życie Weterynaryjne; 2016, 91, 09
0137-6810
Pojawia się w:
Życie Weterynaryjne
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:
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
Wyświetlanie 1-15 z 22

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