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Journal of the Mechanical Behavior of Biomedical Materials

Kyle Murdock, Caitlin Martin, Wei Sun
Flexure is an important mode of deformation for native and bioprosthetic heart valves. However, mechanical characterization of bioprosthetic leaflet materials has been done primarily through planar tensile testing. In this study, an integrated experimental and computational cantilever beam bending test was performed to characterize the flexural properties of glutaraldehyde-treated bovine and porcine pericardium of different thicknesses. A strain-invariant based structural constitutive model was used to model the pericardial mechanical behavior quantified through the bending tests of this study and the planar biaxial tests previously performed...
September 12, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Sebastian Wille, Paul Zumstrull, Victor Kaidas, Lea Katharina Jessen, Matthias Kern
OBJECTIVES: The aim of this study was to evaluate the transformation of yttrium stabilized tetragonal zirconia (Y-TZP) to monoclinic phase and its change in flexural strength of the various layers of multilayered zirconia (enamel layer, transition layer 1, transition layer 2 and body layer) in comparison to two conventional zirconia ceramics. Additionally, the ball-on-three-balls test was compared with a conventional biaxial flexural strength test. METHODS: The crystallographic structure of the four layers of Katana Zirconia ML (Kuraray), e...
September 8, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Khosro Fallahnezhad, Hamidreza Farhoudi, Reza H Oskouei, Mark Taylor
A finite element model was developed to investigate the effect of loading regimes caused by various daily activities on the mechanical behaviour of the head-neck taper junction in modular hip replacements. The activities included stair up, stair down, sit to stand, stand to sit, one leg standing and knee bending. To present the real mechanical environment of the junction, in addition to the force components, the frictional moments produced by the frictional sliding of the head and cup were applied to a CoCr/CoCr junction having a 12/14 taper with a proximal mismatch angle of 0...
September 7, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Behzad Seyfi, Nasser Fatouraee, Abbas Samani
Mechanical characterization of adipose tissue micro-components is important for various biomedical applications such as tissue engineering and predicting adipose tissue response to forces involved in relevant medical intervention procedures (e.g. breast needle biopsy). For this characterization, we introduce a novel structural method for micromechanical modeling of the adipose tissue. The micromechanical model was developed using fluid-structure interaction (FSI) formulation. We utilized this model within an inverse problem framework to estimate the hyperelastic parameters of adipose tissue extracellular matrix (ECM)...
September 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Andreas Dominik Schwitalla, Tycho Zimmermann, Tobias Spintig, Mohamed Abou-Emara, Justus Lackmann, Wolf-Dieter Müller, Alireza Houshmand
Frequent reports attest to the various advantages of tapered implant/abutment interfaces (IAIs) compared to other types of interfaces. For this reason, a conical IAI was designed as part of the development of a PEEK (polyetheretherketone)-based dental implant. This IAI is equipped with an apically displaced anti-rotation lock with minimal space requirements in the form of an internal spline. The objective of this study was the determination of the average insertion torque (IT) at failure of this design, so as to determine its suitability for immediate loading, which requires a minimum IT of 32Ncm...
September 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Özgür Irmak, Batu Can Yaman, Dong Yong Lee, Ekim Onur Orhan, Francis K Mante, Fusun Ozer
This study evaluated the effect of simulated chewing forces on the flexural strength of fiber reinforced posts (FRPs). Four different brands of FRPs were selected as main group for the study: RelyX Fiber Post (RX), IceLight (ICE), Unicore Posts (UC), FlouroPost (FP). Ten posts in each main group didn't receive any aging process and tested as baseline (BL), other ten posts were subjected to simulated chewing forces/mechanical aging (MA) as follows: Post spaces were prepared in acrylic with drill. Depth of preparation was adjusted to leave 4-mm coronal part of posts protruding from canals...
September 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Huan Yang, Lian Duan, Qian Li, Zhenhua Tian, Guoying Li
Systematic analysis of the rheological behavior of collagen solution (10mg/mL) as a function of acetic acid (AA) concentration (0.1-10M) was performed to achieve a deeper understanding about the interaction between collagen molecules and acidic solvent. Steady shear tests showed that all samples exhibited pseudo-plasticity with shear-thinning behavior. Viscosity decreased from 236.448 to 0.792Pa·s at 0.1s(-1) suggesting the flow ability of collagen solution improved with increasing AA concentration. Dynamic frequency sweep analysis revealed that the storage modulus, loss modulus, and complex viscosity decreased with the increased AA concentration due to the disentanglement of collagen molecules, while the loss tangent increased...
September 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Kieran A Murray, Maurice N Collins, Regina P O'Sullivan, Guang Ren, Declan M Devine, Alan Murphy, Jarosław Sadło, Carol O'Sullivan, Brian McEvoy, Olivier Vrain, Cathriona O'Neill, Gerard Insley
Premixed calcium phosphate cements (CPC's) are becoming the material of choice for injectable cements as a result of their effective delivery to the target implantation site. For orthopaedic use, it is of vital importance that the attributes of these CPC's are not compromised by irradiation sterilization. Therefore, the aim of this study is to determine the influence of irradiation sterilization on a range of premixed CPC's, with an emphasis on improving product shelf life through the use of optimal packaging configurations and annealing steps...
September 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
D Dinesh Kumar, Gobi Saravanan Kaliaraj
Protecting from wear and corrosion of many medical devices in the biomedical field is an existing scientific challenge. Surface modification with multilayer ZrN/Cu coating was deposited on medical grade stainless steel (SS) and titanium substrates to enhance their surface properties. Structural results revealed that the ZrN/Cu coatings are highly crystalline and uniform microstructure on both the substrates. Dry and wet tribological measurements of the coated titanium substrate exhibit enhanced wear resistance and low friction coefficient due to the improved microstructure...
September 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Lukas Hingsammer, Markus Grillenberger, Martin Schagerl, Michael Malek, Stefan Hunger
The following work is the first evaluating the applicability of 3D printed zirconium dioxide ceramic miniplates and screws to stabilize maxillary segments following a Le-Fort I advancement surgery. Conventionally used titanium and individual fabricated zirconium dioxide miniplates were biomechanically tested and compared under an occlusal load of 120N and 500N using 3D finite element analysis. The overall model consisted of 295,477 elements. Under an occlusal load of 500N a safety factor before plastic deformation respectively crack of 2...
September 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Cemre S Kaya, Yener Temelli, Filiz Ates, Can A Yucesoy
Previous physiological experiments and finite element modelling indicate that inter-synergistic epimuscular myofascial force transmission (EMFT) between co-activated muscles has a potential to affect healthy muscle's contribution to joint moment and joint range of movement. This is quite relevant for patients with cerebral palsy (CP) since, amplitude of spastic muscle's force and the joint range of force exertion are central to the joint movement limitation. Stiffness of activated spastic muscle is also a determinant for pathological joint movement...
September 3, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Yingchao Su, Cheng Luo, Zhihui Zhang, Hendra Hermawan, Donghui Zhu, Jubin Huang, Yunhong Liang, Guangyu Li, Luquan Ren
Metallic biomaterials are widely used for clinical applications because of their excellent mechanical properties and good durability. In order to provide essential biofunctionalities, surface functionalization is of particular interest and requirement in the development of high-performance metallic implants. Inspired by the functional surface of natural biological systems, many new designs and conceptions have recently emerged to create multifunctional surfaces with great potential for biomedical applications...
September 1, 2017: Journal of the Mechanical Behavior of Biomedical Materials
P Abhiram Sirimamilla, Clare M Rimnac, Jevan Furmanski
Highly crosslinked UHMWPE is now the material of choice for hard-on-soft bearing couples in total joint replacements. However, the fracture resistance of the polymer remains a design concern for increased longevity of the components in vivo. Fracture research utilizing the traditional linear elastic fracture mechanics (LEFM) or elastic plastic fracture mechanics (EPFM) approach has not yielded a definite failure criterion for UHMWPE. Therefore, an advanced viscous fracture model has been applied to various notched compact tension specimen geometries to estimate the fracture resistance of the polymer...
September 1, 2017: Journal of the Mechanical Behavior of Biomedical Materials
H Sadeghi, B M Lawless, D M Espino, D E T Shepherd
Cracks can occur in the articular cartilage surface due to the mechanical loading of the synovial joint, trauma or wear and tear. However, the propagation of such cracks under different frequencies of loading is unknown. The objective of this study was to determine the effect of frequency of loading on the growth of a pre-existing crack in cartilage specimens subjected to cyclic tensile strain. A 2.26mm crack was introduced into cartilage specimens and crack growth was achieved by applying a sinusoidally varying tensile strain at frequencies of 1, 10 and 100Hz (i...
September 1, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Aref Samadi-Dooki, George Z Voyiadjis, Rhett W Stout
Viscoelastic properties of the white matter brain tissue are systematically studied in this paper utilizing indentation experiments, mathematical modeling, and finite element simulation. It is first demonstrated that the internal stiffness of the instrument needs to be thoroughly obtained and incorporated in the analysis as its contribution to the recorded mechanical response is significant for experiments on very compliant materials. The flat-punch monotonic indentation is then performed indirectly on sagittal plane slices with pushing a large rigid coverslip into the sample surface...
September 1, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Bhavesh Patel, Huan Chen, Aashish Ahuja, Joshua F Krieger, Jillian Noblet, Sean Chambers, Ghassan S Kassab
In the present work, we propose the first structural constitutive model of the passive mechanical behavior of the swine colon that is validated against physiological inflation-extension tests, and accounts for residual strains. Sections from the spiral colon and the descending colon were considered to investigate potential regional variability. We found that the proposed constitutive model accurately captures the passive inflation-extension behavior of both regions of the swine colon (coefficient of determination R(2)=0...
August 31, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Bruno Jetté, Vladimir Brailovski, Mathieu Dumas, Charles Simoneau, Patrick Terriault
BACKGROUND: The current total hip prostheses with dense femoral stems are considerably stiffer than the host bones, which leads to such long-term complications as aseptic loosening, and eventually, the need for a revision. Consequently, the lifetime of the implantation does not match the lifetime expectation of young patients. METHOD: A femoral stem design featuring a porous structure is proposed to lower its stiffness and allow bone tissue ingrowth. The porous structure is based on a diamond cubic lattice in which the pore size and the strut thickness are selected to meet the biomechanical requirements of the strength and the bone ingrowth...
August 31, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Anna Ferrara, Pasquale Totaro, Simone Morganti, Ferdinando Auricchio
Ascending aorta aneurysms (AsAA) are associated with a degeneration of the aortic wall tissue, which leads to changes in tissue mechanical properties. Risk factors for the development of the AsAA disease are recognized in patient age and gender, valve type, hypertension, diabetes mellitus, smoking history, and a prior diagnosis of Marfan syndrome. The present study aims to assess how such clinico-pathological factors can affect the mechanical properties of human dilated ascending aorta. Specimens of AsAA are excised from 68 patients who underwent elective AsAA surgical repair and stretched until rupture during the execution of uniaxial tensile tests...
August 31, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Mustafa Unal, Fatih Cingoz, Cevat Bagcioglu, Yilmaz Sozer, Ozan Akkus
Interrelationship between electrical and mechanical properties of cortical bone and the role of bone composition in this interrelationship are not comprehensively investigated to date. This study aimed to investigate associations of electrical properties (i.e., specific impedance, dielectric constant, and conductivity) with mechanical properties (i.e., toughness, strength and elastic modulus) of wet and sequentially dehydrated cortical bone. Bovine cortical bone samples (N = 24) were subjected to three-point bending test...
August 30, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Johannes Weickenmeier, Mehmet Kurt, Efe Ozkaya, Max Wintermark, Kim Butts Pauly, Ellen Kuhl
Magnetic resonance elastography holds promise as a non-invasive, easy-to-use, in vivo biomarker for neurodegenerative diseases. Throughout the past decade, pigs have gained increased popularity as large animal models for human neurodegeneration. However, the volume of a pig brain is an order of magnitude smaller than the human brain, its skull is 40% thicker, and its head is about twice as big. This raises the question to which extent established vibration devices, actuation frequencies, and analysis tools for humans translate to large animal studies in pigs...
August 26, 2017: Journal of the Mechanical Behavior of Biomedical Materials
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