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Acta of Bioengineering and Biomechanics

Katarzyna Walczak, Stefan Rues, Mieszko Wieckiewicz, Ursula Range, Marc Schmitter
PURPOSE: To show the influence of retentive cavity, cavity wall preparation and different luting techniques on the fracture resistance of severely damaged teeth restored with adhesive core build-ups and monolithic zirconium crowns. METHODS: Extracted molars were prepared with 2 mm ferrule height and divided into eleven groups (n = 8/group). In nine groups a retentive occlusal cavity with a width and depth of 1 or 2 mm was prepared. Two control groups without a retentive cavity were made...
2016: Acta of Bioengineering and Biomechanics
Thijs Krabben, Gerdienke B Prange, Hermen J Kobus, Johan S Rietman, Jaap H Buurke
PURPOSE: The primary aim of this study is to investigate the potential benefit of the Teager-Kaiser Energy Operator (TKEO) as data pre-processor, in an autonomous burst detection method to classify electromyographic signals of the (fore)arm and hand. For this purpose, optimal settings of the burst detector, leading to minimal detection errors, need to be known. Additionally, the burst detector is applied to real muscle activity recorded in healthy adults performing reach-to-grasp movements...
2016: Acta of Bioengineering and Biomechanics
Mariusz Drużbicki, Grzegorz Przysada, Agnieszka Guzik, Andrzej Kwolek, Agnieszka Brzozowska-Magoń, Marek Sobolewski
PURPOSE: The aim of the study is to define the impact of exercise on a treadmill on static balance and stability of posture in a group of patients after cerebral stroke rehabilitated in a late period, with an application of a treadmill with the function of visual biofeedback. METHODS: The examination was carried out in a group of 46 people in a late period after ischemic cerebral stroke. The patients examined were randomly put to a group with intervention (n = 23), in which a rehabilitation programme with an application of a treadmill with the visual feedback function was realized and to a control group (n = 23)...
2016: Acta of Bioengineering and Biomechanics
Magdalena Karczewska, Anna Madej, Aleksandra Sadowska, Andrzej Mastalerz, Czesław Urbanik
PURPOSE: The aim of this paper was to examine and compare the changes of ground reaction forces observed during the Basic Step on the Core Board fitness device at various levels of stability. MATERIAL AND METHOD: The study involved 10 female students. Participants stepped on and off the Core Board 10 times at 3 levels of stability. After completing a series of steps, the Core Board's stability was modified and the participant repeated the whole series. The measurement platform to examine three components of the reaction force (horizontal in the sagittal and frontal planes, and vertical) was used...
2016: Acta of Bioengineering and Biomechanics
Senad Omerović, Ernst Tomasch, Andreas J Gutsche, Ivan Prebil
PURPOSE: Whiplash injuries to the cervical spine represent a considerable economic burden on society with medical conditions, in some cases persisting for more than a year. Numerous studies of whiplash injuries have been made for occupant normal seated position, leaving the analysis of neck injuries for out-of-normal positions not well documented. For that purpose, a detailed human cervical spine finite element model was developed. METHODS: The analysis was made for four most common occupant seated positions, such as: Normal Position with the torso against the seat back and the head looking straight ahead, Torso Lean forward position with the torso away from the seat back for approximately 10°, Head Flexed position with the head flexed forward approximately 20° from the normal position and Head-Flexed with Torso Lean forward position with the head flexed forward approximately 20° and torso 10° from the normal position...
2016: Acta of Bioengineering and Biomechanics
Aleksandra Truszczyńska, Martyna Dobrzyńska, Zbigniew Trzaskoma, Justyna Drzał-Grabiec, Adam Tarnowski
PURPOSE: The pain, motor and sensory deficits are common symptoms of the lumbar disc disorder, and they can significantly affect human postural control. The aim of this study was to assess postural stability in patients with severe symptoms of lumbar spine disc disease qualifying them for surgical treatment and to compare them with a control group. METHODS: The study involved 103 subjects: 54 patients and 49 healthy subjects. Patient's mean age was 46.4 ± 11.3 years, mean body height 172...
2016: Acta of Bioengineering and Biomechanics
Nenad Filipovic, Igor Saveljic, Nemanja Jovicic, Irena Tanaskovic, Nebojsa Zdravkovic
PURPOSE: In this study the computational and experimental electroporation model with human aorta tissue is made in order to examine the reduction of smooth muscle cells. METHODS: The segments in native state of the aorta are treated by electroporation method through a series of electrical impulses from 50 V/cm to 2500 V/cm. For each patient we analyzed one sample with and one sample without electroporation as a control. In the computational study, electrical field distribution is solved by the Laplace equation...
2016: Acta of Bioengineering and Biomechanics
Henning Dathe, Riccardo Gezzi, Christoph Fiedler, Dietmar Kubein-Meesenburg, Hans Nägerl
PURPOSE: We investigate the dependence of the kinematics of the human knee on its anatomy. The idea of describing the kinematics of the knee in the sagittal plane using four-bar linkage is almost as old as kinematics as an independent discipline. We start with a comparison of known four-bar linkage constructions. We then focus on the model by H. Nägerl which is applicable under form closure. METHODS: We use geometry and analysis as the mathematical methods. The relevant geometrical parameters of the knee will be determined on the basis of the dimensions of the four-bar linkage...
2016: Acta of Bioengineering and Biomechanics
Arleta Staszuk, Benita Wiatrak, Ryszard Tadeusiewicz, Ewa Karuga-Kuźniewska, Zbigniew Rybak
PURPOSE: Telerehabilitation is one of the newest branches of telemedicine which has been developed because patients need regular trainings outside the medical institution but still under specialist supervision. It helps maintain regularity of exercises and reduces costs. The professional and advanced systems for telerehabilitation are presented in papers, however, there is still lack of development of minor systems which provide therapeutic values and are more accessible to people. Therefore we focus on a solution for hand telerehabilitation of poststroke patients, based solely on a personal computer and camera...
2016: Acta of Bioengineering and Biomechanics
Elżbieta Szczygieł, Karol Piotrowski, Joanna Golec, Dorota Czechowska, Agata Masłoń, Aneta Bac, Edward Golec
PURPOSE: Head constitutes 6% of our body weight and significantly influences human body motor system mechanics. From physiological point of view, it should be located at extension of body middle line. Its location being modified results in many consequences in motor system. Our research was aimed at assessing the influence of head position on human body balance stabilographic variables. METHODS: The research was made on a group of 62 patients: 45 women and 17 men, aged from 40 to 60 yrs, 46 yrs on average...
2016: Acta of Bioengineering and Biomechanics
Piotr Prochor, Szczepan Piszczatowski, Eugeniusz Sajewicz
PURPOSE: The study was aimed at biomechanical evaluation of a novel Limb Prosthesis Osseointegrated Fixation System (LPOFS) designed to combine the advantages of interference-fit and threaded solutions. METHODS: Three cases, the LPOFS (designed), the OPRA (threaded) and the ITAP (interference-fit) implants were studied. Von-Mises stresses in bone patterns and maximal values generated while axial loading on an implant placed in bone and the force reaction values in contact elements while extracting an implant were analysed...
2016: Acta of Bioengineering and Biomechanics
Natalya Kizilova, Allahyar Geramy, Yurij Romashov
PURPOSE: The plane 2D model and 3d finite element model of the headgear attached to two molars with different mesio-distal location are studied to show the asymmetric mechanical effects produced by symmetrically loaded headgear. In daily dental practice the asymmetrical location of molars is usually ignored. METHODS: Six 3D finite element models of a symmetric cervical headgear were designed in SolidWorks 2011. The models showed symmetric molar position (model 1), 0...
2016: Acta of Bioengineering and Biomechanics
Jolanta Pauk, Katarzyna Minta-Bielecka
PURPOSE: Hemiplegia is a paralysis on one side of the body resulting from disease or injury to the motor centers of the brain that may lead to difficulty in walking and problems in balance. A new methodology for hemiplegia gait patterns classification based on bicluster analysis, which aims to identify a group of patients with similar gait patterns, and verify if spatial-temporal gait parameters are correlated with the Barthel Index, has been proposed. METHODS: Eighteen hemiplegia patients were recruited...
2016: Acta of Bioengineering and Biomechanics
Kamil Joszko, Wojciech Wolański, Michał Burkacki, Sławomir Suchoń, Karol Zielonka, Andrzej Muszyński, Marek Gzik
PURPOSE: The aim of the study was to develop and verify a model of rally driver with a safety system HANS (head supporting device), which will enable biomechanical analysis of injuries in rally accident. METHODS: Simulations were carried out in Madymo® software, the results of which were verified based on sled test performed in the Automotive Industry Institute (PIMOT) in Warsaw. The model being verified allowed us to perform a multivariate simulation of rally accident in terms of assessing effectiveness of protection and usefulness of HANS system...
2016: Acta of Bioengineering and Biomechanics
Abeer M Eldeeb, Hamada A Hamada, Amr A Abdel-Aziem
PURPOSE: Pregnancy is characterized by many musculoskeletal changes that affect daily living activities and walking. The purpose of this study was to examine the effect of pregnancy on pelvic and trunk kinematics, and their relationship during the three pregnancy trimesters. METHODS: Three-dimensional pelvis and trunk motions were measured using Qualisys Gait Analysis System in the first, second and third trimesters of pregnancy. The maximum anterior pelvic tilt and maximum trunk flexion during stance phase, pelvic tilt, obliquity and rotation, as well as trunk flexion-extension, lateral bending and rotation were measured...
2016: Acta of Bioengineering and Biomechanics
Daniel Jodko, Damian Obidowski, Piotr Reorowicz, Krzysztof Jóźwik
PURPOSE: The aim of this study was to investigate the blood flow in the end-to-side arteriovenous (a-v) fistula, taking into account its pulsating nature and the patient-specific geometry of blood vessels. Computational Fluid Dynamics (CFD) methods were used for this analysis. METHODS: DICOM images of the fistula, obtained from the angio-computed tomography, were a source of the data applied to develop a 3D geometrical model of the fistula. The model was meshed, then the ANSYS CFX v...
2016: Acta of Bioengineering and Biomechanics
Miglena Kirilova-Doneva, Dessislava Pashkouleva, Vasil Kavardzhikov
PURPOSE: The purpose of the paper is to examine and compare the viscoelastic mechanical properties of human transversalis and umbilical fasciae according to chosen strain levels. METHODS: A sequence of relaxation tests of finite deformation ranging from 4 to 6% strain with increment 0.3% was performed at strain rate 1.26 mm/s. Initial and equilibrium stresses T0, Teq, initial modulus E and equilibrium modulus Eeq, reduction of the stress during relaxation process ΔT, as well as the ratio (1 - Eeq /E) were calculated...
2016: Acta of Bioengineering and Biomechanics
Joanna Mystkowska
PURPOSE: Degradation processes of metallic biomaterials in the oral cavity limit the stability and reliability of dental materials. The influence of environment bacteria Desulfotomaculum nigrificans sulfate reducing bacteria on the corrosion processes of Co-Cr-Mo and Ti-6Al-4V alloys was assessed. METHODS: After 28 and 56 days of contact of the materials with the bacterial environment, the surfaces of the biomaterials tested were observed by means of confocal scanning laser microscopy (CSLM), and their chemical composition was studied using X-Ray Photoelectron Spectrometry (XPS)...
2016: 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
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