Corrigendum to "Fracture behaviour of MOD restorations reinforced by various fibre reinforced techniques - An in vitro study" [J. Mech. Behav. Biomed. Mater. 98 (2019) 348-356].
Corrigendum to "Fracture behaviour of MOD restorations reinforced by various fibre reinforced techniques - An in vitro study" [J. Mech. Behav. Biomed. Mater. 98 (2019) 348-356]. J Mech Behav Biomed Mater. 2019 Nov 04;:103505 Authors: Sáry T, Garoushi S, Braunitzer G, Alleman D, Volom A, Fráter M PMID: 31694796 [PubMed - as supplied by publisher] (Source: Journal of the Mechanical Behavior of Biomedical Materials)
Source: Journal of the Mechanical Behavior of Biomedical Materials - November 4, 2019 Category: Materials Science Authors: Sáry T, Garoushi S, Braunitzer G, Alleman D, Volom A, Fráter M Tags: J Mech Behav Biomed Mater Source Type: research

Effect of cellulose nanofiber content on flexural properties of a model, thermoplastic, injection-molded, polymethyl methacrylate denture base material.
Abstract Cellulose nanofiber (CNF) made from wood-derived fiber is considered as a potential alternative reinforcing material to conventional fibers. The aim of this study was to investigate the effect of CNF on the flexural properties of CNF-reinforced, injection molded, polymethyl methacrylate (PMMA) denture base material. Test specimens were fabricated from a model thermoplastic denture base resin using the injection molding technique. The resin pellets were mixed with CNF (to obtain different weight percentages 5, 10, 15, and 23 wt%). PMMA without CNF served as the control (0 wt%). Prior to the testing, th...
Source: Journal of the Mechanical Behavior of Biomedical Materials - October 31, 2019 Category: Materials Science Authors: Kawaguchi T, Lassila LVJ, Baba H, Tashiro S, Hamanaka I, Takahashi Y, Vallittu PK Tags: J Mech Behav Biomed Mater Source Type: research

Tribocorrosion behaviour of pure titanium in bovine serum albumin solution: A multiscale study.
ng ZJ Abstract Tribocorrosion behaviour of pure titanium in phosphate buffer saline (PBS) solution has been investigated systematically as a function of surface chemistry and bovine serum albumin (BSA) content in the solution. A ball-on-disk tribometer coupled with an electrochemical cell was used to study the effect of electrochemical conditions (i.e. anodic and cathodic applied potentials, as well as at open circuit potential) on the tribocorrosion response of titanium. It was found that the main material loss is due to mechanical wear caused by plastic deformation. The mechanical wear was higher under anodic co...
Source: Journal of the Mechanical Behavior of Biomedical Materials - October 24, 2019 Category: Materials Science Authors: Liamas E, Thomas ORT, Muñoz AI, Zhang ZJ Tags: J Mech Behav Biomed Mater Source Type: research

On the characterization of interstitial fluid flow in the skeletal muscle endomysium.
The objective was to understand the transport properties of the three-dimensional and highly hierarchical muscular interstitial matrices, which play important roles in muscle-bone cross-talk and signaling during musculoskeletal development and maintenance. Gastrocnemius muscles from four 3-month old calves were harvested and subjected to a creeping test using a custom-designed device. The experiments, in combination with an anatomy-based theoretical model, were used to capture the spatial-temporal response of the skeletal muscle to external impacts. For the first time, the detailed load-induced interstitial fluid pressuriz...
Source: Journal of the Mechanical Behavior of Biomedical Materials - October 20, 2019 Category: Materials Science Authors: Wang Q, Pei S, Lu XL, Wang L, Wu Q Tags: J Mech Behav Biomed Mater Source Type: research

Measurement of the shear modulus in thin-layered tissues using numerical simulations and shear wave elastography.
The objective of this study is to introduce a method that combines numerical simulations and SWE measurements to provide a more accurate calculation of shear modulus in layered tissues. In the proposed method, the spatial distribution of the acoustic radiation force (ARF) emitted by the transducer was first computed. The ARF was then used as input for simulating the guided wave propagation in the thin layer with its surroundings. The simulations were repeated for several values of the shear modulus of the layer to obtain the corresponding simulated wave speed. By comparing the measured and simulated wave speeds, a more acc...
Source: Journal of the Mechanical Behavior of Biomedical Materials - October 18, 2019 Category: Materials Science Authors: Sadeghi S, Cortes DH Tags: J Mech Behav Biomed Mater Source Type: research

Synthesis, characterization and in vitro biocompatibility study of strontium titanate ceramic: A potential biomaterial.
In this study, perovskite oxide - strontium titanate (SrTiO3) was synthesized and explored its potential for biomedical applications. The phase pure SrTiO3 powder was synthesized from solid state reaction of strontium carbonate (SrCO3) and titanium dioxide (TiO2) at 1200 °C for 2 h. The as synthesized SrTiO3 powder, pure hydroxyapatite (HAp) and SrTiO3-50 wt% HAp (SH50) premixed powders were sintered at different temperatures varies from 1100 to 1400 °C in air. The sintered samples were characterized using X-ray diffraction (XRD) for phases and scanning electron microscopy (SEM) for microstructure analysis....
Source: Journal of the Mechanical Behavior of Biomedical Materials - October 15, 2019 Category: Materials Science Authors: Sahoo S, Sinha A, Das M Tags: J Mech Behav Biomed Mater Source Type: research

Rate-dependent adhesion of cartilage and its relation to relaxation mechanisms.
This study investigates the rate dependence of adhesion from pre-to post-relaxation timescales of cartilage and its possible relation to relaxation responses of the tissue. Adhesion tests on cartilage were performed to obtain rate-dependent cartilage adhesion from relaxed to unrelaxed states and corresponding relaxation responses. The rate dependence of cartilage adhesion was analyzed based on experimental relaxation responses. Cartilage adhesion increased about 20 times from relaxed to unrelaxed states. This rate-dependent enhancement correlated well with the load relaxation responses in a characteristic time domain. Thes...
Source: Journal of the Mechanical Behavior of Biomedical Materials - October 13, 2019 Category: Materials Science Authors: Han G, Eriten M, Henak CR Tags: J Mech Behav Biomed Mater Source Type: research

A poro-hyper-viscoelastic rate-dependent constitutive modeling for the analysis of brain tissues.
Abstract In this paper, the dynamic behavior of bovine brain tissue, measured from in-vitro unconfined compression tests, is examined and represented through a viscoelastic biphasic model. The experiments have been carried out under three compression speeds of 10, 100, and 1000 mm/s. The results exhibited significant rate-dependent behavior. The brain tissue is modeled as a biphasic continuum consisting of a compressible solid matrix, fully saturated with an incompressible interstitial fluid. The governing equations based on conservation of mass and momentum are used to describe the solid-fluid interactions. An ...
Source: Journal of the Mechanical Behavior of Biomedical Materials - October 11, 2019 Category: Materials Science Authors: Hosseini-Farid M, Ramzanpour M, McLean J, Ziejewski M, Karami G Tags: J Mech Behav Biomed Mater Source Type: research

Formulating injectable pastes of porous calcium phosphate glass microspheres for bone regeneration applications.
Abstract Current trends in regenerative medicine treatments for bone repair applications focus on cell-based therapies. These aim to deliver the treatment via a minimally invasive injection to reduce patient trauma and to improve efficacy. This paper describes the injectability of porous calcium phosphate glass microspheres to be used for bone repair based on their formulation, rheology and flow behavior. The use of excipients (xanthan gum, methyl cellulose and carboxyl methyl cellulose) were investigated to improve flow performance. Based on our results, the flow characteristics of the glass microsphere pastes va...
Source: Journal of the Mechanical Behavior of Biomedical Materials - October 11, 2019 Category: Materials Science Authors: Matamoros-Veloza A, Hossain KMZ, Scammell BE, Ahmed I, Hall R, Kapur N Tags: J Mech Behav Biomed Mater Source Type: research

Alternative processing methods of hybrid porous scaffolds based on gelatin and chitosan.
ero A Abstract The present work focuses on the development of scaffolds based on gelatin and chitosan using different protocols based on the general processing of phase separation, derived from the fabrication of hydrogels and freeze-drying. The scaffolds were produced with 1 wt% of two different biopolymers, i.e. gelatin (GE) and chitosan (CH), and the influence of the ratio between the two polymers was analyzed, as well as three different processing methods. This analysis consisted in assessing their mechanical properties by strain and frequency sweep tests, and comparing their microstructure and fiber arrange...
Source: Journal of the Mechanical Behavior of Biomedical Materials - October 5, 2019 Category: Materials Science Authors: Perez-Puyana V, Rubio-Valle JF, Jiménez-Rosado M, Guerrero A, Romero A Tags: J Mech Behav Biomed Mater Source Type: research

Evaluation of fracture properties of cancellous bone tissues using digital image correlation/wedge splitting test method.
Abstract The fracture mechanics (FM) parameters of cancellous bone tissues are very important from a clinical point of view especially for the bone cement augmentation. From the literature review, one can observe that the experimental determination of fracture mechanic parameters of cancellous bone are still lacking. This can be due to the conditions associated with the unstable crack propagation in the cancellous bone and lack of tools to extract and measure the parameters (like crack opening displacement (COD) and crack length) in the course of fracture tests, which are necessary to evaluate the fracture propert...
Source: Journal of the Mechanical Behavior of Biomedical Materials - October 5, 2019 Category: Materials Science Authors: Bokam P, Germaneau A, Rigoard P, Vendeuvre T, Valle V Tags: J Mech Behav Biomed Mater Source Type: research

Influence of different light-curing units in surface roughness and gloss of resin composites for bleached teeth after challenges.
Abstract The aim of this study evaluates the surface roughness and gloss of resin composites for bleached teeth, using different modes of light curing and photoinitiators after challenges. Eighty discs were made with Filtek Z350XT (camphorquinone) and Vit-l-escence (camphorquinone, amine and lucerin-TPO). Forty disks were light cured by a monowave LED and forty with a polywave LED. Roughness and gloss analysis were made. The specimens were exposed to brushing and hydrochloric acid (HCl) and analyzed again. The data were analyzed by two-way ANOVA analysis of variance for repeated measures, considering each challeng...
Source: Journal of the Mechanical Behavior of Biomedical Materials - October 3, 2019 Category: Materials Science Authors: Carvalho Andrade K, Pavesi Pini NI, Dias Moda M, de Souza E Silva Ramos F, Dos Santos PH, Fraga Briso AL, Cestari Fagundes T Tags: J Mech Behav Biomed Mater Source Type: research

Strain-rate dependence of viscous properties of the plantar soft tissue identified by a spherical indentation test.
Abstract The mechanical properties of the plantar soft tissue are known to vary in diabetic patients, indicating that parameter identification of the mechanical properties of the foot tissue using an indentation test is clinically important for possible early diagnosis and interventions of diabetic foot. However, accurate mechanical characterization of the viscous properties of the plantar soft tissue has been difficult, as measured force-relaxation curves of the same soft tissue differ depending on how the material is loaded. In the present study, we attempted to clarify how the indentation rate of the plantar so...
Source: Journal of the Mechanical Behavior of Biomedical Materials - October 3, 2019 Category: Materials Science Authors: Negishi T, Ito K, Kamono A, Lee T, Ogihara N Tags: J Mech Behav Biomed Mater Source Type: research

Design and characterization of a porous pouch to prevent peritoneal adhesions during in vivo vascular graft maturation.
In this study, we utilized the peritoneal cavity as an "in vivo" bioreactor to recruit autologous cells to electrospun conduits enclosed within porous pouches to improve the response after grafting. Specifically, we designed a new poly (ethylene glycol)-based pouch to avoid adhesion to the peritoneal wall and still allow the necessary peritoneal fluid to reach the enclosed conduit. The pouch mechanics in compression and bending were determined through experiments and finite element simulations to optimize the pouch design. This included poly (ethylene glycol) concentration, pore density, and pouch size. We demons...
Source: Journal of the Mechanical Behavior of Biomedical Materials - October 3, 2019 Category: Materials Science Authors: Shojaee M, Sameti M, Vuppuluri K, Ziff M, Carriero A, Bashur CA Tags: J Mech Behav Biomed Mater Source Type: research

Frequency dependent viscoelastic properties of porcine brain tissue.
Abstract Brain tissue is vulnerable and sensitive, predisposed to potential damage under complicated loading conditions. Its material properties have been investigated, but the characterization of its viscoelastic properties is currently limited. The aim of this study was to investigate the viscoelastic properties of brain tissue. Porcine brain samples, dissected ex vivo in the coronal plane, were tested under compression using dynamic mechanical analysis over a range of frequencies between 0.1 and 35 Hz. Indenters with varying diameters of 8, 12 and 16 mm were used to study the effect on viscoelastic properti...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 30, 2019 Category: Materials Science Authors: Li W, Shepherd DET, Espino DM Tags: J Mech Behav Biomed Mater Source Type: research

Fracture toughness, vibration modal analysis and viscoelastic behavior of Kevlar, glass, and carbon fiber/epoxy composites for dental-post applications.
Abstract The use of flexible dental posts concentrates the stress at the dentin and the use of stiff posts increases the stress at the interface. Efforts were directed toward introducing inhomogeneous materials for resolving the disadvantages of both flexible and stiff posts. The main objective of this study was to develop three different fiber/epoxy composite posts. These composites were fabricated using carbon, glass, and Kevlar fibers. Characterization tests were conducted. In the tensile tests, the carbon, glass and Kevlar fiber composites exhibited tensile strengths of 200%, 91%, and 40% of the stainless-stee...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 30, 2019 Category: Materials Science Authors: Fouad H, Mourad AI, ALshammari BA, Hassan MK, Abdallah MY, Hashem M Tags: J Mech Behav Biomed Mater Source Type: research

Patient specific characterization of artery and plaque material properties in peripheral artery disease.
This study proposes that for the limited data available in vivo, material properties of plaque and artery can be identified using inverse FE analysis and either a simple neo-Hookean constitutive model or assuming linear elasticity provides sufficient accuracy to capture the changes in vessel deformation, which is the available clinical metric. To test this, 10 human cadaveric femoral arteries were each pressurized ex vivo at 6 pressure levels, while intravascular ultrasound (IVUS) and virtual histology (VH) imaging were performed during controlled pull-back to determine vessel geometry and plaque structure. The VH images w...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 27, 2019 Category: Materials Science Authors: Noble C, Carlson KD, Neumann E, Dragomir-Daescu D, Erdemir A, Lerman A, Young M Tags: J Mech Behav Biomed Mater Source Type: research

Fluid viscosity but not surface tension, determines the tamponade effect of intravitreal fluids in a novel in vitro eye model of retinal detachment.
CONCLUSIONS: The tamponade effect of an intravitreal fluid against retinal detachment may not be related as previously assumed, solely to surface tension, but rather is proportionally related to its viscosity. PMID: 31577983 [PubMed - as supplied by publisher] (Source: Journal of the Mechanical Behavior of Biomedical Materials)
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 26, 2019 Category: Materials Science Authors: Friehmann A, Eng UZ, Rubowitz A Tags: J Mech Behav Biomed Mater Source Type: research

The influence of polycaporolacton fumarate coating on mechanical properties and in vitro behavior of porous diopside-hardystonite nano-composite scaffold.
Abstract One of the significant challenges in bone tissue engineering is the fabrication of highly porous scaffolds with interconnected pores and appropriate mechanical properties. Artificial scaffolds which used in the field of medicine are usually made of single phase of polymer or ceramic. However, composition of these materials can produce the scaffolds with improve mechanical and biological properties.The aim of this study is to synthesize three-dimensional hardystonite-diopside (HT-Dio) porous scaffolds modified by polycaporolacton fumarate coating for low-load-bearing bone tissue engineering applications. T...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 25, 2019 Category: Materials Science Authors: Sadeghzade S, Emadi R, Tavangarian F, Doostmohammadi A Tags: J Mech Behav Biomed Mater Source Type: research

Effect of hydroxyapatite concentration and size on morpho-mechanical properties of PLA-based randomly oriented and aligned electrospun nanofibrous mats.
bba V Abstract The growing demand for nanofibrous biocomposites able to provide peculiar properties requires systematic investigations of processing-structure-property relationships. Understanding the morpho-mechanical properties of an electrospun scaffold as a function of the filler features and mat microstructure can aid in designing these systems. In this work, the reinforcing effect of micrometric and nanometric hydroxyapatite particles in polylactic acid-based electrospun scaffold presenting random and aligned fibers orientation, was evaluated. The particles incorporation was investigated trough Fourier trans...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 25, 2019 Category: Materials Science Authors: Lopresti F, Carfì Pavia F, Vitrano I, Kersaudy-Kerhoas M, Brucato V, La Carrubba V Tags: J Mech Behav Biomed Mater Source Type: research

Radiopacity and mechanical properties of dental adhesives with strontium hydroxyapatite nanofillers.
Abstract OBJECTIVES: Dental resins filled with hydroxyapatite (HAp) nanoparticles have significantly revolutionized restorative dentistry offering advantages such as remineralization potential and increase of polymerization. However, these materials have limited radiopacity hindering the diagnosis of secondary caries. The present study investigated the development of a new radiopaque dental adhesive by incorporating novel pure strontium hydroxyapatite nanoparticles [Sr10(PO4)6(OH)2, SrHAp] synthesized by a simple hydrothermal method. METHODS: Strontium phosphates were prepared using co-precipitation (SrHAp0h)...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 23, 2019 Category: Materials Science Authors: Carvalho EV, de Paula DM, Andrade Neto DM, Costa LS, Dias DF, Feitosa VP, Fechine PBA Tags: J Mech Behav Biomed Mater Source Type: research

Adhesion, biological corrosion resistance and biotribological properties of carbon films deposited on MAO coated Ti substrates.
Abstract A thin diamond-like carbon (DLC) film, a graphite-like carbon (GLC) film and a thick diamond-like carbon (PE-DLC) film are deposited on the micro arc oxidation (MAO) coated pure titanium substrates using a hybrid ion beam deposition system, magnetron sputtering and plasma enhanced chemical vapor deposition, respectively. The microstructure, adhesion, biological corrosion resistance and biotribological properties were determined. The results showed that the three duplex coatings presented uneven surface features and increased binding force. The binding force of the duplex coatings was strongly affected by ...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 23, 2019 Category: Materials Science Authors: Yang W, Gao Y, Guo P, Xu D, Hu L, Wang A Tags: J Mech Behav Biomed Mater Source Type: research

Fracture behavior of Bi-structure fiber-reinforced composite restorations.
i S Abstract OBJECTIVE: The aim of this study was to evaluate the fracture-behavior of direct composite restorations made with two different composite-core materials. In addition, fracture toughness (FT), flexural strength (FS) and flexural modulus (FM) of tested composites were evaluated. METHODS: Twenty groups of posterior crown restorations were fabricated (n = 6/group). The groups were made of a 4-5 mm layer of composite-core materials (everX Flow and SDR Flow+) and covered by a 2 mm layer of conventional composite (G-aenial Anterior & Posterior, G-aenial Universal Injectable, Essentia, CeramX...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 20, 2019 Category: Materials Science Authors: Lassila L, Säilynoja E, Prinssi R, Vallittu PK, Garoushi S Tags: J Mech Behav Biomed Mater Source Type: research

Electro-codeposition of CeO2 nanoparticles into cobalt matrix to improve the tribocorrosion performances of Co/nano CeO2 composite layers in biological solution for medical applications.
Abstract Co/nano-CeO2 composite layers were developed by electro-codeposition method from a cobalt electrolyte containing dispersed CeO2 nanoparticles. The tribocorrosion performances of both Co/nano-CeO2 and pure Co layers were comparatively investigated by sliding friction tests under lubricated condition in biological Hank solution. The effect of embedded nano-CeO2 on the corrosion electrochemical response, friction coefficient and wear loss volume is analyzed. The results show that the codeposited of nano-CeO2 particles into cobalt matrix reduce the friction coefficient and wear weight loss as well as the shif...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 19, 2019 Category: Materials Science Authors: Benea L, Simionescu N, Celis JP Tags: J Mech Behav Biomed Mater Source Type: research

A mesoscopic theory to describe the flexibility regulation in F-actin networks: An approach of phase transitions with nonlinear elasticity.
Abstract The synthetic actin network arouses great interest as bio-material due to its soft and wet nature that mimics many biological scaffolding structures. Inside the cell, the actin network is regulated by tens of actin-binding proteins (ABP's), which make for a highly complex system with several emergent behaviors. In particular, calponin is an ABP that was identified as an actin stabiliser, but whose mechanism is still poorly understood. Recent experiments using an in vitro model system of cross-linked actin with calponin and large deformation bulk rheology, found that networks with exhibited a delayed onset...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 18, 2019 Category: Materials Science Authors: Lopez-Menendez H Tags: J Mech Behav Biomed Mater Source Type: research

An investigation of the effect of freezing storage on the biaxial mechanical properties of excised porcine tricuspid valve anterior leaflets.
In this study, we aimed to address this gap in knowledge by performing biaxial mechanical characterizations of the tricuspid valve anterior leaflet (TVAL) tissue both before and after a 48-h freezing period. Primary findings of this study include: (i) a statistically insignificant change in the tissue extensibilities, with the frozen tissues being slightly stiffer and more anisotropic than the fresh tissues; and (ii) minimal variations in the stress relaxation behaviors between the fresh and frozen tissues, with the frozen tissues demonstrating slightly lessened relaxation. The findings from this study suggested that freez...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 16, 2019 Category: Materials Science Authors: Duginski GA, Ross CJ, Laurence DW, Johns CH, Lee CH Tags: J Mech Behav Biomed Mater Source Type: research

Biomechanical signaling and collagen fiber reorientation during distraction enterogenesis.
In this study we examined the effects of distraction enterogenesis at different post-operative days on the thickness of small intestinal layers in the intestine proximal and distal to the distracted segment, as well as how the submucosal collagen fibers were reoriented. It was observed that not only different layers of intestine wall in distracted segment showed thickening due to the applied mechanical force but also adjacent tissues in both distal and proximal directions were impacted significantly where they showed thickening as well. The orientation of collagen fibers in submucosa layer was also significantly impacted d...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 14, 2019 Category: Materials Science Authors: Hosseini HS, Wood LSY, Taylor JS, Dubrovsky G, Portelli KI, Thomas AL, Dunn JCY Tags: J Mech Behav Biomed Mater Source Type: research

On the mechanical behavior of austenitic stainless steel with nano/ultrafine grains and comparison with micrometer austenitic grains counterpart and their biological functions.
Abstract Conventional coarse-grained (CG) biomedical austenitic stainless steel with grain size in the micrometer range was subjected to a novel phase reversion concept involving severe cold deformation, followed by annealing, when the cold deformed martensite reverts to austenite with grain size in the nanometer/ultrafine (NG/UFG) regime (~200-400 nm). The mechanical behavior of CG and NG/UFG steels was studied via load-controlled and displacement-controlled experiments using a nanoindentation technique with the aim to simulate micromotion. The plastic zone associated with the indentation-induced deformed regio...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 14, 2019 Category: Materials Science Authors: Gong N, Hu C, Hu B, An B, Misra RDK Tags: J Mech Behav Biomed Mater Source Type: research

Enhancement of stress corrosion cracking of AZ31 magnesium alloy in simulated body fluid thanks to cryogenic machining.
Abstract Magnesium and its alloys have recently attracted great attention as potential materials for the manufacture of biodegradable implants. Unfortunately, their inadequate resistance to the simultaneous action of corrosion and mechanical stresses in the human body have hampered their use as implant materials. This work aims at evaluating the Stress Corrosion Cracking (SCC) susceptibility of the AZ31 Mg alloy after being machined under cryogenic cooling. The SCC behaviour was evaluated by means of Slow Strain Rate Tests (SSRTs) in Simulated Body Fluid (SBF) at 37 °C. Prior to testing, a full characterizat...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 11, 2019 Category: Materials Science Authors: Peron M, Bertolini R, Ghiotti A, Torgersen J, Bruschi S, Berto F Tags: J Mech Behav Biomed Mater Source Type: research

Lamellar structure/processing relationships and compressive properties of porous Ti6Al4V alloys fabricated by freeze casting.
Abstract Lamellar pores have superior biocompatibility due to their similarity to the lamellar structure of natural bones. In the present work, porous Ti6Al4V alloys with lamellar pores were successfully fabricated by directionally freeze casting. The lamellar structure/processing relationships were systematically studied through analyzing the interaction between ice front and alloy powders. The structural feature of translamella bridges is observed in the lamellar structure. The volume shrinkage of porous Ti6Al4V alloys is in the range of 44-60%. This is much higher compared with that of the porous ceramics. The ...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 7, 2019 Category: Materials Science Authors: Li F, Xue X, Jia T, Dang W, Zhao K, Tang Y Tags: J Mech Behav Biomed Mater Source Type: research

Heat and hydrothermal treatments on the microstructure evolution and mechanical properties of plasma sprayed hydroxyapatite coatings reinforced with graphene nanoplatelets.
Abstract Recent demands in clinical applications drive a large amount of research to plasma sprayed hydroxyapatite (HA) composite coatings. Herein, graphene nanosheet (GNS) reinforced HA coating was fabricated using plasma spray, the effect of heat and hydrothermal treatments (hereafter referred to as thermal treatment) on microstructural evolution and mechanical properties of the composite coating were investigated. Thermally treated GNS/HA coating not only exhibited ~47.1% improvement in HA crystallinity and more denser microstructure, but also displayed increased surface roughness (3 times of that of the as-spr...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 5, 2019 Category: Materials Science Authors: Ren J, Zhao D, Qi F, Liu W, Chen Y Tags: J Mech Behav Biomed Mater Source Type: research

Tribological and wear behaviour of alumina toughened zirconia nanocomposites obtained by pressureless rapid microwave sintering.
ell A Abstract Dense alumina toughened zirconia nanocomposites (ATZ, 3Y-TZP with 20 wt% Al2O3) were densified by non-conventional microwave sintering technology at relatively low temperatures (1200 and 1300 °C). The sintering method and its effect on densification, microstructure, mechanical properties and tribological behaviour were investigated. The outcomes demonstrated that the density rose as the sintering temperature was higher, and therefore the mechanical properties were enhanced, reaching a maximum hardness (18.4 ± 0.4 GPa) and fracture toughness (5.7 ± 0.3MPa· m1/...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 4, 2019 Category: Materials Science Authors: Gil-Flores L, Salvador MD, Penaranda-Foix FL, Dalmau A, Fernández A, Borrell A Tags: J Mech Behav Biomed Mater Source Type: research

A Helmholtz resonator on elastic foundation for measurement of the elastic coefficient of human skin.
Abstract A new sensing mechanism is proposed for the measurement of elasticity of human skin by utilizing Helmholtz resonator with a flexible membrane mounted at the bottom and putting on an elastic foundation. Elastic coefficient of human skin is modeled as the elastic foundation modulus, based on the assumption that human skin is equivalent to the Winkler foundation. For the Helmholtz resonator, the acoustic transmission loss (by which resonant frequency can be acquired) was derived by using the receptance coupling method, based on the theories of conventional Helmholtz resonator and fixed-edge membrane on elast...
Source: Journal of the Mechanical Behavior of Biomedical Materials - September 4, 2019 Category: Materials Science Authors: Chen Y, Park YH Tags: J Mech Behav Biomed Mater Source Type: research

Performance analysis of grafted poly (2-methacryloyloxyethyl phosphorylcholine) on additively manufactured titanium substrate for hip implant applications.
This study focuses on optimising monomer concentration to achieve the best physical, thermal and mechanical properties of the grafted additively manufactured titanium (Ti6Al4V) implants. Three different concentration of monomers, 0.4 M, 0.6 M and 0.8 M, were investigated, and grafted implants were characterised. The results from thermal analysis confirmed that the PMPC polymer is thermally stable for implant applications regardless of the monomer concentrations. A significant reduction in Young's modulus of polymer grafted samples (33.2-42.9%), in comparison with untreated Ti6Al4V samples and consequent improvement o...
Source: Journal of the Mechanical Behavior of Biomedical Materials - August 30, 2019 Category: Materials Science Authors: Ghosh S, Abanteriba S, Wong S, Houshyar S Tags: J Mech Behav Biomed Mater Source Type: research

Biodegradable implantable balloons: Mechanical stability under physiological conditions.
We report in this study the limits of the mechanical stability of the PLCL balloon shape spacer (implant) under prolonged cyclic loading, so as to be able to predict their physical stability in vivo. We have demonstrated in an in vitro settings that the implant withstands fatigue cycles for significantly longer than 8 weeks, which provides sufficient time window for patients to perform substantial rehabilitation and recover from an injury. The data presented herein is expected to assist medical practitioners in safety and efficacy measurements and assessment following spacer implantation. PMID: 31473436 [PubMed - as s...
Source: Journal of the Mechanical Behavior of Biomedical Materials - August 27, 2019 Category: Materials Science Authors: Haim Zada M, Kumar A, Elmalak O, Markovitz E, Icekson R, Machlev E, Mechrez G, Domb AJ Tags: J Mech Behav Biomed Mater Source Type: research

Influence of green tea extract in the color of composite resin restorations.
Abstract The aim of this study was to evaluate the color change of composite resin restorations in Class I cavity preparation with different depths, submitted to challenge of thermocycling in coffee, after the use of green tea extract (EGCG) as treatment on the dentin surface. Forty-eight human molars were divided into 6 groups according to dentin treatment and depth of restoration (n = 8): Group C3- Control/3 mm; Group C4- Control/4 mm; Group C5- Control/5 mm; Group EGCG3- EGCG/3 mm; Group EGCG4- EGCG/4 mm; and Group EGCG5- EGCG/5 mm. The teeth of the control groups were re...
Source: Journal of the Mechanical Behavior of Biomedical Materials - August 27, 2019 Category: Materials Science Authors: Lopes RG, Oliveira-Reis B, Maluly-Proni AT, Silva MHT, Briso ALF, Dos Santos PH Tags: J Mech Behav Biomed Mater Source Type: research

The dynamic mechanical viscoelastic properties of the temporomandibular joint disc: The role of collagen and elastin fibers from a perspective of polymer dynamics.
This study attempts to quantify the contribution of collagen and elastin fibers to the viscoelastic properties of the disc. Using collagenase and elastase, we perturbed the collagen and elastin fibrillar network in porcine temporomandibular joint discs and investigated the changes of dynamic viscoelastic properties in five different regions of the disc. Following both treatments, the storage and loss moduli of these regions were reduced dramatically up to the point that the tissue was no longer mechanically heterogeneous. However, the proportion of changes in storage and loss moduli were different for each treatment, refle...
Source: Journal of the Mechanical Behavior of Biomedical Materials - August 26, 2019 Category: Materials Science Authors: Fazaeli S, Ghazanfari S, Mirahmadi F, Everts V, Smit TH, Koolstra JH Tags: J Mech Behav Biomed Mater Source Type: research

Evaluating thoracolumbar spine response during simulated underbody blast impact using a total human body finite element model.
This study focuses on developing and validating the spine response of an updated 50th percentile male Global Human Body Models Consortium (GHBMC) Finite Element (FE) model using instrumented post-mortem human subject (PMHS) laboratory tests under two unique conditions. The model was validated against response corridors created using scaled thoracic (T12, T8, T5, T1) and sacrum (S1) spine Z-axis accelerations obtained from WSU whole-body PMHS tests. The scores for the updated spine model ranged from 0.557 - 0.756 for condition 1 (Seat- 4 m/s in 10 ms; Floor- 6 m/s in 5 ms) and 0.639-0.849 for condition 2 (Seat- 4 ...
Source: Journal of the Mechanical Behavior of Biomedical Materials - August 19, 2019 Category: Materials Science Authors: Somasundaram K, Zhang L, Sherman D, Begeman P, Lyu D, Cavanaugh JM Tags: J Mech Behav Biomed Mater Source Type: research

Comparison of endocrowns made of lithium disilicate glass-ceramic or polymer-infiltrated ceramic networks and direct composite resin restorations: fatigue performance and stress distribution.
This study compared the fatigue performance and the stress distribution of endodontically treated molars restored with endocrowns obtained with lithium disilicate glass-ceramic or a polymer-infiltrated ceramic network, both processed by CAD-CAM, and direct composite restorations. Forty-eight human mandibular molars were randomly assigned into 03 groups (n = 16) and restored with endocrowns (LD - lithium disilicate glass-ceramic or PICN - polymer-infiltrated ceramic network) or with direct composite restorations. Fatigue testing followed a step-stress approach (initial maximum load of 200 N and 5000 cycles, incrementa...
Source: Journal of the Mechanical Behavior of Biomedical Materials - August 19, 2019 Category: Materials Science Authors: Dartora G, Rocha Pereira GK, Varella de Carvalho R, Zucuni CP, Valandro LF, Cesar PF, Caldas RA, Bacchi A Tags: J Mech Behav Biomed Mater Source Type: research

Multiscale micromechanical modeling of the elastic properties of dentin.
Abstract The paper focuses on multiscale modeling of the elastic properties of dentin. It is modeled as a hierarchical structure consisting of collagen fibers and hydroxyapatite particles at the lower level. Different concentrations of hydroxyapatite in this tissue correspond to peritubular and intertubular dentins. Then, the overall material is modeled as intertubular dentin matrix containing parallel cylindrical holes (the tubules) surrounded by layers of peritubular dentin. At each microstructural level, the model accounts for anisotropy of the constituents. The model predictions are compared with experimental ...
Source: Journal of the Mechanical Behavior of Biomedical Materials - August 14, 2019 Category: Materials Science Authors: Seyedkavoosi S, Sevostianov I Tags: J Mech Behav Biomed Mater Source Type: research

The effect of the nano- bioglass reinforcement on magnesium based composite.
Abstract Nano-bioceramic particles serving as a reinforcement can improve the mechanical and biological properties of magnesium implants, but they might have some side effects, that must be addressed. In this research, magnesium composites including 10 wt% nano-bioglass (nBG) were fabricated using powder metallurgy (PM10) and spark plasma sintering (SPS10) methods for bone reconstruction purposes. The results of the compression test indicated that the SPS10 sample had higher mechanical properties, in comparison to the PM10 sample, and nBG had more reinforcing effect on the mechanical properties of magnesium matr...
Source: Journal of the Mechanical Behavior of Biomedical Materials - August 12, 2019 Category: Materials Science Authors: Khodaei M, Nejatidanesh F, Shirani MJ, Valanezhad A, Watanabe I, Savabi O Tags: J Mech Behav Biomed Mater Source Type: research

Biaxial mechanics of 3D fiber deposited ply-laminate scaffolds for soft tissue engineering part II: Finite element analyses.
In this study, a parametric FE model was developed and evaluated to elucidate the influence of various print parameters on the uniaxial, transverse constrained uniaxial, and biaxial tensile mechanics of 3DF angle-ply laminate scaffolds. Of the print parameters considered in this study, fiber angle, fiber diameter, and fiber spacing had the most dramatic influence on Effective Elastic modulus (EE) in all loading regimes and equibiaxial Effective Elastic modulus ratio (EEr). Layer thickness and contact area were found to have moderate influence on EE and EEr, and the number of layers was found to have only a minor influence ...
Source: Journal of the Mechanical Behavior of Biomedical Materials - August 10, 2019 Category: Materials Science Authors: Page M, Puttlitz C Tags: J Mech Behav Biomed Mater Source Type: research

Short communication: Influence of retainer configuration and loading direction on the stress distribution of lithium disilicate resin-bonded fixed dental prostheses: 3D finite element analysis.
n M Abstract The present study elucidates the mechanical performance of different designs of resin-bonded fixed dental prostheses made of lithium disilicate simulating masticatory loads of anterior or canine guidance. A three-dimensional model of maxilla was constructed containing central incisor and canine teeth, with edentulous space of the lateral incisor. Three designs of prosthesis were created: retained in central incisor (1-I), retained in canine (1-C) and fixed in both teeth (2-IC). The computational analysis was performed for load in canine and central incisor separately (100N, 45°). The tensile and s...
Source: Journal of the Mechanical Behavior of Biomedical Materials - August 5, 2019 Category: Materials Science Authors: Dal Piva AMO, Tribst JPM, Saavedra GSFA, Souza ROA, de Melo RM, Borges ALS, Özcan M Tags: J Mech Behav Biomed Mater Source Type: research

High-strength cellulose-polyacrylamide hydrogels: Mechanical behavior and structure depending on the type of cellulose.
Abstract Two types of stiff and high-strength composite hydrogels possessing the structure of interpenetrating polymer networks were synthesized via free-radical polymerization of acrylamide carried out straight within the previously formed physical network of regenerated plant cellulose or bacterial cellulose (PC and BC respectively) that was swollen in the reactive solution. The mechanical behavior of synthesized hydrogels subjected to the action of compressive deformations with different amplitude values was studied. The analysis of the stress-strain curves of compression tests of the hydrogels of both types ob...
Source: Journal of the Mechanical Behavior of Biomedical Materials - August 3, 2019 Category: Materials Science Authors: Buyanov AL, Gofman IV, Saprykina NN Tags: J Mech Behav Biomed Mater Source Type: research

Manufacturing of polycaprolactone - Graphene fibers for nerve tissue engineering.
In this study, different percentages of graphene have been dispersed in a polycaprolactone-cyclopentanone solution to produce electrospun fibers. The microstructure and morphology of the fibers and the mechanical behavior of the electrospun systems were evaluated to analyze the influence of graphene content on the performances of the fibers. A significant dimensional difference between the fibers diameters of was obtained due to the graphene percentage. Accordingly, the mechanical properties of the fibrous systems are found to be influenced by the presence of the graphene. Rat stem cells were cultured on the fibrous scaffo...
Source: Journal of the Mechanical Behavior of Biomedical Materials - August 3, 2019 Category: Materials Science Authors: Ginestra P Tags: J Mech Behav Biomed Mater Source Type: research

A novel thymol-doped enamel bonding system: Physico-mechanical properties, bonding strength, and biological activity.
CONCLUSION: The thymol is extremely compatible with the methacrylate resin restorative system and completely fulfills all requirements of a good bactericidal component in construction of an ideal enamel bonding system. PMID: 31386988 [PubMed - as supplied by publisher] (Source: Journal of the Mechanical Behavior of Biomedical Materials)
Source: Journal of the Mechanical Behavior of Biomedical Materials - August 1, 2019 Category: Materials Science Authors: Rezaeian Z, Beigi-Boroujeni S, Atai M, Ebrahimibagha M, Özcan M Tags: J Mech Behav Biomed Mater Source Type: research

Microscale assessment of corneal viscoelastic properties under physiological pressures.
In this study the micromechanical properties of pressurised porcine corneas were determined using oscillatory nanoindentation coupled with a custom inflation method. Inflation was conducted in phosphate buffered saline (PBS) and tissue culture (TC) solutions. The shear storage modulus (G') and shear loss modulus (G") was determined for corneas inflated corneas with PBS and TC. Central corneal thickness (CCT) was monitored during the inflation (0-60 mmHg). Elastic modulus (E) was also calculated and quantitatively mapped for corneas. The results showed that G' at 15 mmHg was 86.18 ± 16 k...
Source: Journal of the Mechanical Behavior of Biomedical Materials - July 29, 2019 Category: Materials Science Authors: Kazaili A, Geraghty B, Akhtar R Tags: J Mech Behav Biomed Mater Source Type: research

Osteoporosis-related variations of trabecular bone properties of proximal human humeral heads at different scale lengths.
In conclusion, the obtained data showed that OP affects bone properties at different scale lengths causing an alteration of its morphological, structural and mechanical features. PMID: 31369957 [PubMed - as supplied by publisher] (Source: Journal of the Mechanical Behavior of Biomedical Materials)
Source: Journal of the Mechanical Behavior of Biomedical Materials - July 26, 2019 Category: Materials Science Authors: Giulia M, Alessio D, Gabriela C, Massimo L, Chiara N, Marco C, Nicola B, Fabrizio G, Sonia F, Chiara VB Tags: J Mech Behav Biomed Mater Source Type: research

Bending shape memory behaviours of carbon fibre reinforced polyurethane-type shape memory polymer composites under relatively small deformation: Characterisation and computational simulation.
In this study, carbon fibre reinforced SMPU (CF/SMPU) composites were studied as promising cranial implants that can offer shape memory properties, shape flexibility and high strength. First, the basic properties of pristine SMPU and CF/SMPU composites were characterised, including glass transition temperature (Tg), the viscosity of SMPU, the morphology of CF/SMPU, and their tensile and flexural mechanical properties. Then, a new method using rheometer was developed to study the shape memory behaviours of SMPU and CF/SMPU with three-point bending under relatively small deformations (≤1%), including flexural stress durin...
Source: Journal of the Mechanical Behavior of Biomedical Materials - July 25, 2019 Category: Materials Science Authors: Cheng X, Chen Y, Dai S, Bilek MMM, Bao S, Ye L Tags: J Mech Behav Biomed Mater Source Type: research

Evaluation of bio-based monomers from isosorbide used in the formulation of dental composite resins.
The objective of this study was to synthesize two bio-based monomers from isosorbide, the bis(allylcarbonate) isosorbide (IBAC) and the bis(methacrylate) isosorbide (IBM), and to evaluate its effect as Bis-GMA diluents in the formulation of photopolymerizable dental composite resins. The chemical structure of both bio-based monomers was determinate by means H1 NMR, C13 NMR and FTIR spectroscopies. Experimental composites comprising Bis-GMA/IBAC or Bis-GMA/IBM were formulated using 65 %wt of silanized inorganic filler. Experimental materials were compared with a control composite formulated with Bis-GMA/TEGDMA. Double bond ...
Source: Journal of the Mechanical Behavior of Biomedical Materials - July 24, 2019 Category: Materials Science Authors: Herrera-González AM, Pérez-Mondragón AA, Cuevas-Suárez CE Tags: J Mech Behav Biomed Mater Source Type: research