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Acta of Bioengineering and Biomechanics

Damian Nakonieczny, Zbigniew Paszenda, Sabina Drewniak, Tomasz Radko, Marcin Lis
PURPOSE: The main objective of this study was to obtain single-phase β-ZrO2 powders with so-called soft agglomerates reproducibile morphology with acetyl-acetone as a chelating-agent. To the best of our knowledge there is no avaiable data which determine the effect of acetyl acetone on the phase composition and morphology of ceria-doped ZrO2 powders for biomedical applications. METHODS: Twenty variants of powders with different water to zirconia precursor and acetylacetone to zirconia precursor molar ratios were prepared...
2016: Acta of Bioengineering and Biomechanics
Grzegorz Chladek, Katarzyna Basa, Jarosław Żmudzki, Piotr Malara, Agnieszka J Nowak, Jacek Kasperski
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...
2016: Acta of Bioengineering and Biomechanics
Edwin Regrain, Philippe Regnault, Christopher Kirtley, Shahaboddin Shamshirband, André Chays
PURPOSE: After a vestibular deficit some patients may be affected by chronical postural instability. The aim of this study was to identify the emotional and cognitive factors of these symptomatic patients. In particular, the double cognitive task and the anxiety disorder were identified by our patients. Through a retrospective study, 14 patients (65.4 ± 18 years) participated in the experiment. METHOD: The experimentation consists in the study of the standing position of our patients through the aggregate of the trajectories of the center of pressure (COP) using a force plate device...
2016: Acta of Bioengineering and Biomechanics
Dmitry Ivanov, Yuri Barabash, Anatoly Barabash
PURPOSE: Today intramedullary locked nails are widespread in treatment of diaphyseal long bone fractures of the lower limb. However, such nails have a number of drawbacks: complexity and duration of the installation, high axial stiffness, as well as the failure of locking screws and nail body. Expandable nails such as Fixion have several advantages over lockable ones. They can be quickly installed without the need of reaming and provide sufficient stabilization of the fracture. However, many studies show their low stability under torsional loads...
2016: Acta of Bioengineering and Biomechanics
Miloslav Vilimek, Zdenek Horak, Vaclav Baca
The temporomandibular (TM) joint is one of the most active joints in the human body, and any defect in this joint has a significant impact on the quality of life. The objective of this study was to analyze changes in the force ratio after TM joint replacement on contralateral TM joint loading. Implantation of an artificial TM joint often requires removal of 3 of the 4 masticatory muscles (activators). In order to perform true loading of the TM joint, loading during mastication was investigated. Input kinematic variables and mastication force were experimentally examined...
2016: Acta of Bioengineering and Biomechanics
Piotr Król, Andrzej Franek, Paweł Dolibog, Edward Błaszczak, Jacek Durmała, Krzysztof Ficek, Tomasz Król, Bartosz Wnuk, Patrycja Dolibog
PURPOSE: The experiment was designed to evaluate and compare the efficacy of focused shockwave and radial shockwave in symptomatic heel spur treatment. Postural balance tests were used to ensure the objectivity of evaluations. METHODS: Forty three patients with symptomatic heel spur were divided into two comparative groups that received respectively focused shockwave therapy (the FSWT group; 2000 impulses, 4 Hz, 0.4 mJ/mm2) and radial shockwave therapy (the RSWT group; 2000 impulses, 8 Hz, 5 bars + 2000 impulses, 8 Hz, 2...
2016: Acta of Bioengineering and Biomechanics
Anna Mika, Łukasz Oleksy, Renata Kielnar, Marta Świerczek
PURPOSE: To evaluate the influence of two different heel heights on static balance and on limits of stability during functional reach test, with both the eyes open and eyes closed, in young women (age 22-27) who did not wear heeled shoes habitually. METHODS: Thirtyone young women (age 22-27) performed balance tests on a stabilometric platform without footwear and in shoes with 4 cm and 10 cm heels. The center of pressure (COP) deviations range and velocity in anteroposterior (AP) and mediolateral (ML) directions were assessed...
2016: Acta of Bioengineering and Biomechanics
Mariusz Ciesielski, Bohdan Mochnacki, Jarosław Siedlecki
PURPOSE: This paper deals with the mathematical modeling of the thermal processes occurring in the tooth, during a very brief contact (a few seconds) with a very cold liquid on a part of the tooth crown. In this way one can simulate a heat transfer in tooth proceeding during a dental diagnostic test - pulp vitality testing. The impact of rapid ambient thermal changes acting on the tooth can cause toothache. METHODS: The mathematical model: a system of partial differential equations with initial-boundary conditions (the axiallysymmetrical problem) and their numerical solutions using the control volume method is discussed...
2016: Acta of Bioengineering and Biomechanics
Adriana Caracostea, Nadina Morar, Adrian Florea, Andrada Soanca, Mindra Eugenia Badea
PURPOSE: The aim of this study was to qualitatively assess the outcomes of two in vitro aging methods, thermal-cycling and twobody wear simulation accomplished with a dual-axis chewing device, on the surface characteristics of eight direct and indirect dental resin biocomposites. METHODS: Eighty mesial-occlusal-distal dental cavities were restored with four direct nanohybrid composite materials and with four nano- and micro-hybrid lab-fabricated resin composite inlays...
2016: Acta of Bioengineering and Biomechanics
Hans Nägerl, Claudia Hansen, Dietmar Kubein-Meesenburg, Jochen Fanghänel, Henning Dathe, Clemens Dumont, Martin Michael Wachowski
PURPOSE: The curvature morphology of the articulating surfaces determines the physiological movement pattern. We quantitatively examined the curvature morphology of the tibiotalar articulating surfaces and specified their geometric contact patterns. METHODS: Geometrically equivalent cartographic nets were marked on the talar and tibial articulating surfaces of true-to-scale moldings of 20 human ankle joints (intervals of 5 mm) to relate corresponding articulating units of the surfaces...
2016: Acta of Bioengineering and Biomechanics
Hamidreza Ghasemi Bahraseman, Ehsan Mohseni Languri, Niloofar Yahyapourjalaly, Daniel M Espino
PURPOSE: This paper proposes a model to measure the cardiac output and stroke volume at different aortic stenosis severities using a fluid-structure interaction (FSI) simulation at rest and during exercise. METHODS: The geometry of the aortic valve is generated using echocardiographic imaging. An Arbitrary Lagrangian-Eulerian mesh was generated in order to perform the FSI simulations. Pressure loads on ventricular and aortic sides were applied as boundary conditions...
2016: Acta of Bioengineering and Biomechanics
Jieyuan Qian, Yan Zhang, Julien S Baker, Yaodong Gu
Understanding of biomechanics is important in performance development since each skill has a fundamental mechanical structure. The purpose of this study was to investigate differences in lower limb kinematics during table tennis forehand loop between superior players (SP) and intermediate players (IP). Thirteen male players as superior and thirteen as intermediate participated in this test. A VICON motion analysis system and a Novel Pedar insole plantar pressure measurement system were used to record kinematic and contact area data, respectively...
2016: Acta of Bioengineering and Biomechanics
Monika Ratajczak, Marek Sąsiadek, Romuald Będziński
Subdural hematomas are one of the frequent complications of head injuries. Such hematomas result from exceeding the border strength values of bridging veins. Subdural haemorrhages are life-threatening and are a frequent cause of considerable pathologies. Traffic participants and also soldiers who participate in armed conflicts are the most vulnerable to head injuries. Although hematomas have been studied for many years the mechanism of hematoma formation has not been fully clarified as yet. In the paper, the effort of brain tissue structures due to the propagation of shock wave was analyzed...
2016: Acta of Bioengineering and Biomechanics
Grzegorz Hajduk, Karina Nowak, Grzegorz Sobota, Damian Kusz, Konrad Kopeć, Edward Błaszczak, Łukasz Cieliński, Bogdan Bacik
PURPOSE: The patients expect optimal knee function after Total Knee Arthroplasty. It is necessary to apply appropriate surgical technique and supervised physical therapy. The optimal management of posterior cruciate ligament remains controversial. Both implant designs, i.e., cruciate retaining and posterior substituting, allow the orthopedic surgeon to achieve excellent clinical outcomes, as measured by commonly used questionnaires. Such methods of assessment may poorly reflect the functional status of patients...
2016: Acta of Bioengineering and Biomechanics
Maria Vittoria Caruso, Vera Gramigna, Attilio Renzulli, Gionata Fragomeni
PURPOSE: The extracorporeal membrane oxygenation (ECMO) is a temporary, but prolonged circulatory support for cardiopulmonary failure. Clinical evidence suggests that pulsed flow is healthier than non pulsatile perfusion. The aim of this study was to computationally evaluate the effects of total and partial ECMO assistance and pulsed flow on hemodynamics in a patient-specific aorta model. METHODS: The pulsatility was obtained by means of the intra-aortic balloon pump (IABP), and two different cases were investigated, considering a cardiac output (CO) of 5 L/min: Case A - total assistance - the whole flow delivered through the ECMO arterial cannula; Case B - partial assistance - flow delivered half through the cannula and half through the aorta...
2016: Acta of Bioengineering and Biomechanics
Ewa Puszczałowska-Lizis, Przemysław Bujas, Jarosław Omorczyk
PURPOSE: The purpose of this paper was an attempt to evaluate changes in the level of static equilibrium and the impact of visual information on the effectiveness of postural reactions of women in geriatric age. METHODS: 36 senior female residents of L.A. Helc Nursing Home in Cracow, Poland, were examined. Considering the age, 2 groups were distinguished: group I - women at the age 71- 80 and group II - women aged 81-87. Their balance was assessed with stabilographic platform CQ Stab 2P...
2016: Acta of Bioengineering and Biomechanics
Daria Chmielewska, Magdalena Stania, Agnieszka Smykla, Krystyna Kwaśna, Edward Błaszczak, Grzegorz Sobota, Violetta Skrzypulec-Plinta
PURPOSE: The aim of the study was to evaluate the effects of a 6-week sEMG-biofeedback-assisted pelvic floor muscle training program on pelvic floor muscle activity in young continent women. METHODS: Pelvic floor muscle activity was recorded using a vaginal probe during five experimental trials. Biofeedback training was continued for 6 weeks, 3 times a week. Muscle strenghtening and endurance exercises were performed alternately. SEMG (surface electromyography) measurements were recorded on four different occasions: before training started, after the third week of training, after the sixth week of training, and one month after training ended...
2016: Acta of Bioengineering and Biomechanics
Małgorzata Syczewska, Anna Święcicka
PURPOSE: One of the aims of the treatment in ambulant cerebral palsy (CP) patients is improvement of gait. The level of gait pathology is assessed by instrumented gait analysis, including surface electromyography. The aim of this study was to investigate the relation of the abnormality level of the gait and the co-contraction of the agonist-antagonist muscles, and relation between symmetry left /right leg in gait and symmetry of muscular activity. METHODS: Fifty one patients with cerebral palsy underwent clinical assessment and instrumented gait analysis, including surface electromyography...
2016: 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
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