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Acta of Bioengineering and Biomechanics

Wojciech I Ryniewicz, Anna M Ryniewicz, Grażyna Wiśniewska
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...
2016: Acta of Bioengineering and Biomechanics
Mariusz Cierech, Jacek Wojnarowicz, Dariusz Szmigiel, Bohdan Bączkowski, Anna Maria Grudniak, Krystyna Izabela Wolska, Witold Łojkowski, Elżbieta Mierzwińska-Nastalska
PURPOSE: The aim of the paper was to investigate the antifungal activity of zinc oxide nanoparticles (ZnONPs) against Candida albicans. Some attempts have been made to find out the best way to introduce ZnONPs into polymethyl methacrylate (PMMA) resin material and to determine some parameters of a newly formed composite. MATERIAL AND METHODS: Zinc oxide nanoparticles were manufactured and their basic physical parameters were determined (average particle size, density, specific surface area)...
2016: Acta of Bioengineering and Biomechanics
Li-Xin Guo, Rui Li, Ming Zhang
PURPOSE: This study is to reveal the deformation of intervertebral disc (IVD), the stress distribution of solid phase and liquid phase, the variation of fluid flux and flow velocity in lumbar spine and the influence of different permeability parameters on them under intermittent compressive loading. METHODS: A poroelastic FEM of L4-L5 is assigned with different permeability parameters to analyze the deformation, stress distribution and fluid convection under intermittent compressive loads...
2016: Acta of Bioengineering and Biomechanics
Dmitry Ivanov, Aleksandr Dol, Asel Polienko
PURPOSE: Approximately 5% of the adult population has one or more cerebral aneurysm. Aneurysms are one of the most dangerous cerebral vascular pathologies. Aneurysm rupture leads to a subarachnoid hemorrhage with a very high mortality rate of 45-50%. Despite the high importance of this disease there are no criteria for assessing the probability of aneurysm rupture. Moreover, mechanisms of aneurysm development and rupture are not fully understood until now. METHODS: Biomechanical and numerical computer simulations allow us to estimate the behavior of vessels in normal state and under pathological conditions as well as to make a prediction of their postoperative state...
2016: Acta of Bioengineering and Biomechanics
Artur Struzik, Jerzy Zawadzki
PURPOSE: The aim of this study was to present the methodology for estimation of a leg stiffness during a countermovement jump. The question was asked whether leg stiffness in the countermovement and take-off phases are similar to each other as demonstrated in previous reports. It was also examined whether the stiffness in left lower limb is similar to the one in right lower limb. METHODS: The research was conducted on 35 basketball players. Each participant performed three countermovement jumps with arm swing to the maximum height...
2016: Acta of Bioengineering and Biomechanics
Marco A C Branco, Rita Santos-Rocha, Filomena Vieira, Liliana Aguiar, António P Veloso
PURPOSE: The kinematic analysis of gait during pregnancy provides more information about the anatomical changes and contributes to exercise and rehabilitation prescription. The purposes were to describe and quantify the spatial, temporal and kinematic parameters in the joints of the lower limb during gait at the end of the first, second and third trimesters of pregnancy and in the postpartum period. METHODS: A three-dimensional analysis was performed in eleven pregnant women...
2016: Acta of Bioengineering and Biomechanics
Mario C Espada, Mario J Costa, Aldo M Costa, Antonio J Silva, Tiago M Barbosa, Ana F Pereira
The purpose of the study was to analyze the relationships between sprint swimming performance, dry-land power, and kinematics in master swimmers. Twenty-two male master swimmers were separated in two groups based on their chronological age: (i) 30-39 years and; (ii) 40-49 years. Maximum dry-land power was determined through counter movement jump and 3 kg medicine ball throwing (Hmax and Tmax, respectively). Kinematic determinants of performance were measured during a maximal bout of 15, 25 and 50 m front crawl (T15, T25, T50)...
2016: Acta of Bioengineering and Biomechanics
Marcin Maciejczyk, Magdalena Wiecek, Jadwiga Szymura, Zbigniew Szygula
PURPOSE: One of the new products which can be used to increase physical activity and energy expenditure is the Torqway vehicle, powered by the upper limbs. The aim of this study was to (1) assess the usefulness and repeatability of the Torqway vehicle for physical exercise, (2) compare energy expenditure and physiological responses during walking on a treadmill and during physical effort while moving on the Torqway at a constant speed. METHODS: The participants (11 men, aged 20...
2016: Acta of Bioengineering and Biomechanics
Michał Murawa, Lechosław B Dworak, Jarosław Kabaciński, Małgorzata Syczewska, Agata Rzepnicka
PURPOSE: Patient recovery after a surgical procedure depends, among other factors, on the amount of the body weight with which patient loads lower limb. Research studies report different results of the degree of body weight with which lower limb is loaded during three-point crutch gait. The aim of this study was to evaluate the level of the ground reaction forces (GRF) during crutch gait used by patients after total hip arthroplasty (THA) in the first week after discharge from the orthopaedic units...
2016: Acta of Bioengineering and Biomechanics
Jolanta Pauk, Mikhail Ihnatouski, Kristina Daunoraviciene, Uladimir Laskhousky, Julius Griskevicius
PURPOSE: Spastic diplegia is the most common form of cerebral palsy. It presents with symmetric involvement of the lower limbs and upper limbs. Children with spastic diplegia frequently experience problems with motor control, spasticity, and balance which lead to gait abnormalities. The aim of this study is twofold. Firstly, to determine the differences in spatial-temporal gait parameters and magnitude of plantar pressure distribution between children with spastic diplegia (CP) and typical children...
2016: Acta of Bioengineering and Biomechanics
Adam Ciszkiewicz, Józef Knapczyk
PURPOSE: The aim of this paper is to develop a model of the patellofemoral joint by considering the linear displacement along axis of cylindrical joint and to use this model in the analysis of the femur spatial displacements caused by the quadriceps muscle force. METHOD: The linear displacement along the axis of cylindrical joint of the patellofemoral joint is computed using optimization methods - minimization of the difference between the modeled and measured spatial displacements of the femur with respect to the tibia over the full range of the knee flexion...
2016: Acta of Bioengineering and Biomechanics
Henning Dathe, Clemens Dumont, Rainer Perplies, Jochen Fanghänel, Dietmar Kubein-Meesenburg, Hans Nägerl, Martin M Wachowski
PURPOSE: The purpose is to present a mathematical model of the function of the thumb carpometacarpal joint (TCMCJ) based on measurements of human joints. In the TCMCJ both articulating surfaces are saddle-shaped. The aim was to geometrically survey the shapes of the articulating surfaces using precise replicas of 28 TCMCJs. METHODS: None of these 56 articulating surfaces did mathematically extend the differential geometrical neighbourhood around the main saddle point so that each surface could be characterised by three main parameters: the two extreme radii of curvature in the main saddle point and the angle between the saddles' asymptotics (straight lines)...
2016: Acta of Bioengineering and Biomechanics
Przemysław Stróżyk, Jacek K Bałchanowski
PURPOSE: The subject of this research is the human stomatognathic system and the process of biting off various foodstuffs. METHODS: The research was divided into two stages - an experimental stage and a computational stage. In the first stage, tests were carried out to determine the force-displacement characteristics for the biting off food. For this purpose five different foodstuffs were tested in a testing machine and their strength characteristics were determined...
2016: Acta of Bioengineering and Biomechanics
Grzegorz Sokołowski, Dorota Rylska, Jerzy Sokołowski
PURPOSE: Corrosion resistance of titanium used in metal-ceramic restorations in manufacturing is based on the presence of oxide layer on the metal surface. The procedures used during combining metallic material with porcelain may affect the changes in oxide layers structure, and thus anticorrosive properties of metallic material. The aim of the study was an evaluation of potential changes in the structure and selected corrosion properties of titanium after sandblasting and thermal treatment applicable to the processes of ceramics fusion...
2016: Acta of Bioengineering and Biomechanics
Michał Dworak, Stanisław Błażewicz
PURPOSE: The aim of the work was to manufacture a composite stem model consisting of carbon fibres (CF) and polyether ether ketone (PEEK) and to perform the surface strain and stress distributions in the stem-femoral bone model under compression loading. METHODS: Composite stems differing in elasticity were prepared. Three types of composite stems having different arrangements of carbon fibre reinforcements (carbon fibre roving, carbon fibre sleeves and their combinations) in the polymer matrix were made...
2016: Acta of Bioengineering and Biomechanics
Alicja Porenczuk, Piotr Firlej, Grażyna Szczepańska, Adam Kolenda, Dorota Olczak-Kowalczyk
PURPOSE: More than half of the cavity restorations are replaced due to bacterial microleakage. A need for disinfection agents arises. Application of silver nanoparticles (AgNPs) may be beneficial, yet their impact on the adhesives' shear bond strength to dentin remains unknown. METHODS: The aim was to assess the shear bond strength to dentin of different dental materials combined with AgNPs. Failure modes were also examined using SEM/FIB, SEM/EDS and endodontic microscopes...
2016: Acta of Bioengineering and Biomechanics
Małgorzata Syczewska, Ewa Szczerbik, Krzysztof Graff, Dorota Olczak-Kowalczyk, Anna Dąbrowska-Gontarczyk, Małgorzata Kalinowska, Elżbieta Jelonek
PURPOSE: Patients with spasticity suffer not only from neurological problems but also from various dentistry problems due to spasticity of the jaw muscles. Measurements of motion in temporomandibular joints should reflect the amount of abnormal muscle tone of these muscles. The aim of this study was to find out if the measurements of temporomandibular joint movements performed with the ultrasound Zebris device are different in cerebral palsy patients than in healthy subjects; and to find out if the information on the degree of spasticity in the lower legs provided by the Wartenberg test could be used to predict the degree of spasticty in the jaw muscles...
2016: Acta of Bioengineering and Biomechanics
Timothy E L Douglas, Małgorzata Krok-Borkowicz, Aleksandra Macuda, Krzysztof Pietryga, Elżbieta Pamuła
Thermosensitive injectable chitosan hydrogels can be formed by neutralization of acidic chitosan solutions with sodium betaglycerophosphate (Na-β-GP) coupled with increasing temperature to body temperature. Such hydrogels have been considered for applications in bone regeneration. In this study, chitosan hydrogels were enriched with glycerol and the enzyme alkaline phosphatase (ALP) with a view to improving their suitability as materials for bone tissue engineering. Mineral formation was confirmed by infrared spectroscopy (FTIR) and increases in the mass fraction of the hydrogel not consisting of water...
2016: Acta of Bioengineering and Biomechanics
Sérgio Takeshi Tatsukawa DE Freitas, Elizângela Márcia DE Carvalho Abreu, Mariane Cecilia Dos Reis, Bruna DE Souza Cunha, Tamires Souza Moreira Prianti, Fernanda Pupio Silva Lima, Mário Oliveira Lima
Spasticity is one of the main causes of contracture, muscle weakness and subsequent functional incapacity. The passive static stretching can be included as having the purpose of increasing musculoskeletal flexibility, however, it also can influence the muscle torque. The objective is to verify the immediate effect of passive static stretching in the muscle strength of healthy and those who present spastic hemiparesis. There were assessed 20 subjects, 10 spastic hemiparetic (EG) and 10 healthy individuals (CG), including both sexes, aged between 22 and 78 years...
2016: Acta of Bioengineering and Biomechanics
Robert Michnik, Jacek Jurkojć, Piotr Wodarski, Marek Gzik, Katarzyna Jochymczyk-Woźniak, Andrzej Bieniek
PURPOSE: Defining the influence of parameters of visual disorders on ability of balancing turns out to be an important process in effective diagnostics. Current diagnostic methods relating mainly to determination of the coefficient of BRUTM (Balance Rehabilitation Unit Trade Mark) depend on lots of tests carried out in a disturbed environment created by Virtual Reality Technology. The aim of this study is to determine the effect of the frequency of visual disturbances on stabilographic values in the virtual reality environment...
2016: Acta of Bioengineering and Biomechanics
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