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Journal of the Mechanical Behavior of Biomedical Materials

Ricardo Schestatsky, Gustavo Dartora, Rodrigo Felberg, Aloísio Oro Spazzin, Rafael Sarkis-Onofre, Ataís Bacchi, Gabriel Kalil Rocha Pereira
One of the major concerns about endodontically retreated teeth (ERT) is undoubtedly its loss of remnant structure, which could lead to consequently greater fracture risk. Therefore, the objective of this systematic review is to assess the influence of endodontic retreatment on the fracture strength of the dental tooth remnant. In vitro studies assessing the influence of mechanical retreatment on the mechanical properties (static or under fatigue) of restored teeth were searched in PubMed and SCOPUS databases...
October 26, 2018: Journal of the Mechanical Behavior of Biomedical Materials
João Felipe Besegato, Eduardo Inocente Jussiani, Avacir Casanova Andrello, Ricardo Vignoto Fernandes, Fabio Martins Salomão, Bruno Luiz Santana Vicentin, Cássia Cilene Dezan-Garbelini, Márcio Grama Hoeppner
OBJECTIVE: To investigate the effect of two light-curing protocols on mechanical behavior of three bulk-fill resin composites (BFRC) considering their optical properties. METHODS: One increment of 4 mm thickness of the bulk-fill resin composites Opus Bulk Fill, Tetric N-Ceram and Filtek Bulk Fill Flow were submitted to two different light-curing protocols: Sp - irradiance of 1000 mW/cm2 (20 s); Xp - irradiance of 3200 mW/cm2 (6 s). To assess the influence on the mechanical behavior it was studied polymerization shrinkage by X-ray microtomography (n = 3), Vickers hardness (n = 10) at the top and bottom surfaces of the samples, irradiance reaching the bottom surface (n = 3) and absorbance spectrum during the light-curing time interval (n = 3)...
October 25, 2018: Journal of the Mechanical Behavior of Biomedical Materials
José Bauer, Allana Silva E Silva, Edilausson Moreno Carvalho, Paulo Vitor Campos Ferreira, Ceci Nunes Carvalho, Adriana Pigozzo Manso, Ricardo Marins Carvalho
OBJECTIVES: The aim of the study was to evaluate the effect of bioactive glass (45S5 and NbG) suspensions on bond strength (µTBS), hardness, modulus of elasticity, pH and antibacterial activity of the resin-dentin interfaces after 3 months. METHODS: Groups with different concentrations (5% and 20%) of two types of glass (45S5 and NbG), and a control group (distilled water) were studied. Twenty-five extracted human third molars were etched with phosphoric acid. The data from µTBS, hardness and modulus of elasticity data were submitted to two-way ANOVA (suspension vs...
October 25, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Amar Velic, Asha Mathew, Peter Hines, Prasad K D V Yarlagadda
In the biomedical arena, bacterial fouling is a precursor to complications such as implant infection and nosocomial infection. These complications are further compounded by biochemical mechanisms of resistance that threaten the action of traditional antibacterial strategies. Accordingly, antibacterial property by physical, not biochemical, mechanisms of action is becoming increasingly popular and promising. The present work falls in line with this paradigm shift. Here, microtextured Ti-6Al-4V surfaces were manufactured by destructive tension at three different cross-head speeds, probed with scanning electron microscopy (SEM) and multifocus optical microscopy, and treated with Staphylococcus aureus to study bacterial attachment...
October 21, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Kazuaki Nagayama, Keiichi Uchida, Akiko Sato
Vascular smooth muscle cells (SMCs) actively remodel arterial walls through biomechanical signals and dedifferentiate from the contractile to the synthetic state under pathological conditions. It is important to determine the differentiation mechanism of SMCs to understand their pathophysiology in disease. Previously, we found that the F-actin cytoskeleton in dedifferentiated SMCs on dishes was firmly connected to the nucleus, and that internal mechanical signals in SMCs are transmitted directly to the nucleus, indicating that nuclear-cytoskeletal interactions could be associated with SMC differentiation...
October 21, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Elze Porte, Philippa Cann, Marc Masen
The application of hydrogels as articular cartilage (AC) repair or replacement materials is limited by poor tribological behaviour, as it does not match that of native AC. In cartilage, the pressurisation of the interstitial fluid is thought to be crucial for the low friction as the load is shared between the solid and liquid phase of the material. This fluid load support theory is also often applied to hydrogels. However, this theory has not been validated as no experimental evidence directly relates the pressurisation of the interstitial fluid to the frictional response of hydrogels...
October 21, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Taohong Zhang, Geyu Jin, Xiaoxiao Han, Yue Gao, Qingfeng Zeng, Binbin Hou, Dezheng Zhang
A heterogeneous method of coupled multiscale strength model is presented in this paper for calculating the strength of medical polyesters such as polylactide (PLA), polyglycolide (PGA) and their copolymers during degradation by bulk erosion. The macroscopic device is discretized into an array of mesoscopic cells. A polymer chain is assumed to stay in one cell. With the polymer chain scission, it is found that the molecular weight, chain recrystallization induced by polymer chain scissions, and the cavities formation due to polymer cell collapse play different roles in the composition of mechanical strength of the polymer...
October 19, 2018: Journal of the Mechanical Behavior of Biomedical Materials
R Pramanik, B Ganivada, Farsa Ram, Kadhiravan Shanmuganathan, A Arockiarajan
Xerogels are porous networks of crosslinked polymers that are useful for biomedical applications such as drug delivery, scaffold engineering, tissue regeneration, cell culture and wound dressing. However, inferior mechanical properties curtail their applications to a considerable extent. Nanocellulose fibers and crystals are often added into the polymer matrix to improve their mechanical strength. Here, nanocellulose in the mass ratios of 7%, 13% and 18% are loaded into polyvinyl alcohol (PVA) matrix followed by thermo-morpho-mechanical characterization...
October 19, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Nikolaos Karathanasopoulos, Georgios Arampatzis, J-Francois Ganghoffer
We investigate the capacity of tendons to bear substantial loads by exploiting their hierarchical structure and the viscous nature of their subunits. We model and analyze two successive tendon scales: the fibril and fiber subunits. We present a novel method for bridging intra-scale experimental observations by combining a homogenization analysis technique with a Bayesian inference method. This allows us to infer elastic and viscoelastic moduli at the embedded fibril scale that are mechanically compatible with the experimental data observed at the fiber scale...
October 19, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Anindya Pal, Purnendu Nasker, Sudeep Paul, Amit Roy Chowdhury, Arijit Sinha, Mitun Das
Synthesis of strontium-doped hydroxyapatite from Mercenaria clam shells has been carried out by hydrothermal method. The doping of bioceramic, processed from biogenic resources is mostly unexplored. The objective is to understand the effect of strontium (Sr) incorporation on phase stability, sintering behaviour, mechanical properties and cytotoxicity of hydroxyapatite (HAp) derived from clam shells. The different molar concentrations of Sr, varies from 10, 30, 50, 70% of Ca, were substituted into the HAp. The synthesized powders were sintered at 1200 °C in air...
October 17, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Jun Dai, Liang Qin, Yan Chen, Huan Wang, Guanlin Lin, Xiao Li, Hui Liao, Huang Fang
Matrix stiffness is known to alter cellular behaviors in various biological contexts. Previous investigations have shown that epithelial-mesenchymal transition (EMT) promotes the progression and invasion of tumor. Mechanical signaling is identified as a regulator of EMT. However, the molecular mechanisms underlying the influence exerted by matrix stiffness on EMT in osteosarcoma remains largely unknown. Using polyacrylamide hydrogel model, we investigate the effects of matrix stiffness on EMT and migration in osteosarcoma...
October 16, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Alireza Karimi, Reza Razaghi, Toshihiro Sera, Susumu Kudo
The purpose of this study was to perform a set of experimental indentation test to certify our proposed eye model enables to have a better deformation assessment for the eye globe under the indentation load compared to other eye models. To do that, twenty-four enucleated human globes were removed from the cadavers. A screw at 5 different loading rates indented to the eye globes and the resulting macroscopic force-displacement as a result of the deformation in the apex of the cornea was measured. The experimental results revealed significantly higher stiffness, elastic modulus, and maximum force for the globe at higher loading rates (50 and 100 mm/min) (n = 4 globes, p < 0...
October 16, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Marweh Schmitz, Dirk W Schubert, Joachim Kaschta, Jonas Daenicke, Bastian L Walter, Raymund E Horch
OBJECTIVES: Bacterial contamination of breast implants and biofilm formation has been discussed as a major reason for implant loss and capsular contraction. Intra- and perioperative treatment of breast implants with disinfectants to prevent bacterial contamination has been frequently reported. Given the increasing awareness of concerns about product liability the question of whether short-time irrigation of implants with antimicrobial substances during the operative procedure would potentially alter the integrity of the implant shell has attracted legal and medical interest...
October 15, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Fabio Cozzolino, Davide Apicella, Guixue Wang, Antonio Apicella, Roberto Sorrentino
The experimental determination of local bone deformations due to implant loading would allow for a better understanding of the biomechanical behavior of the bone-implant-prosthesis system as well as the influence of uneven force distribution on the onset of implant complications. The present study aimed at describing an innovative in vivo strain gauge measurement technique to evaluate implant-to-bone force transmission, assessing whether and how oral implants can transfer occlusal forces through maxillary bones...
October 15, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Fereshteh Mirahmadi, Jan Harm Koolstra, Sepanta Fazaeli, Frank Lobbezoo, G Harry van Lenthe, Jessica Snabel, Reinout Stoop, Vincent Everts
Nutrition of articular cartilage relies mainly on diffusion and convection of solutes through the interstitial fluid due to the lack of blood vessels. The diffusion is controlled by two factors: steric hindrance and electrostatic interactions between the solutes and the matrix components. Aging comes with changes in the cartilage structure and composition, which can influence the diffusion. In this study, we treated fibrocartilage of mandibular condyle with ribose to induce an aging-like effect by accumulating collagen crosslinks...
October 14, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Rhoda Au Yeung, Ross A Kennedy
Sodium alginate is a non-toxic natural polysaccharide found in marine brown algae. It is able to form solid gels by the action of poly-valent cations (commonly calcium but not magnesium) which cross-link the polysaccharide chains at the guluronic acid groups. Alginate-based products are popular in many industries, including food production and in pharmaceutical and biomedical applications. It is utilized in manufacture of wound-care products due to its biocompatibility and gel forming capabilities upon the absorption of wound exudate...
October 13, 2018: Journal of the Mechanical Behavior of Biomedical Materials
M H Korayem, S Shahali, Z Rastegar
Due to the softness and vulnerability of biological cells, in manipulation operations, it is not possible to insert excessive force to move these cells. Also, cells in their living environment face with many dynamic factors; therefore, in order to prevent their destruction and death, consideration the environmental conditions, the theoretical studies that underlie the laboratory research should be closer to the actual results. So, in this article by simultaneous consideration of cell's viscoelasticity and asperities on its surface, as well as the correction of the viscoelastic constant in the liquid medium, the effects of the number of asperities on the contact area between cell and substrate on the manipulation process are investigated and by considering different mediums effects, cell's roughness and developed Hamaker for viscoelastic state, more accurate results of simulations are obtained...
October 12, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Takuma Tobe, Yo Shibata, Ayako Mochizuki, Naofumi Shimomura, Jun Zhou, Wurihan, Reina Tanaka, Sachiko Ikeda, Zhongpu Zhang, Qing Li, Tomio Inoue, Takashi Miyazaki
An increase in non-enzymatic collagen matrix cross-links, such as advanced glycation end-products (AGEs), is known to be a major complication in human mineralized tissues, often causing abnormal fractures. However, degradation of mechanical properties in relation to AGEs has not been fully elucidated at the material level. Here, we report nanoscale time-dependent deformation and dimensional recovery of human tooth dentin that has undergone glycation induced by x-ray irradiation. The reduction in enzymatic collagen cross-linking and the increased level of AGEs with concomitant growth of disordered collagen matrix diminished creep deformation recovery in the lower mineralized target region...
October 12, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Esmat Jalalvandi, Amin Shavandi
Injectable hydrogel systems are useful in many biomedical applications, including drug or cell delivery carriers and scaffolds. Here, we describe the design and characterization of a shear thinning hydrogel that undergoes a disassembly when shear forces are applied during injection and is self-healing once the shear forces are removed. This hydrogel is based on a cyclodextrin modified alginate, and a methacrylated gelatin which initially forms through a weak guest-host interaction between hydrophobic cyclodextrin cavities and the aromatic residue of gelatin...
October 12, 2018: Journal of the Mechanical Behavior of Biomedical Materials
María Prados-Privado, Rosa Rojo, Carlos Ivorra, Juan Carlos Prados-Frutos
To evaluate the bending and torsional properties of four nickel-titanium endodontic files, we simulated and compared WaveOne® primary size 25 with 0.07 taper, WaveOne Gold® primary size 25 with 0.07 taper, Reciproc® primary size 25 with 0.08 taper, and Reciproc Blue® primary size 25 with 0.08 taper. Three-dimensional models were created using computer-aided design software and numerically analyzed in ANSYS® Workbench. Boundary conditions for the numerical analyses were based on the ISO 3630-1 specifications...
October 12, 2018: Journal of the Mechanical Behavior of Biomedical Materials
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