3,075 results match your criteria Journal of the Mechanical Behavior of Biomedical Materials [Journal]


Strength limits in mesoscaled 3Y-TZP ceramics for micro-surgical instruments.

J Mech Behav Biomed Mater 2018 Dec 4;91:99-108. Epub 2018 Dec 4.

Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA; Institut fuer Struktur- und Funktionskeramik, Montanuniversitaet Leoben, Leoben 8700, Austria. Electronic address:

Micro-surgical instruments are a new application for mesoscale ceramics formed using the lost mold-rapid infiltration forming (LM-RIF) process. Instrument strength and reliability are the foremost concerns for this sensitive application. It is hypothesized that increasing grain size can improve the damage tolerance of the parts associated with the transformation toughening in the 3Y-TZP material, while retaining high strength. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.12.001DOI Listing
December 2018
1 Read

Stored potential energy increases and elastic properties alterations are produced after restoring dentin with Zn-containing amalgams.

J Mech Behav Biomed Mater 2018 Dec 6;91:109-121. Epub 2018 Dec 6.

University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071 Granada, Spain.

The aim of this research was to ascertain the mechanical and chemical behavior of sound and caries-affected dentin (CAD), after the placement of Zn-free vs containing amalgam restorations. Peritubular and intertubular dentin were evaluated using, a) nanoindenter in scanning mode; the load and displacement responses were used to perform the nano-Dynamic mechanical analysis and to estimate the complex (E * ) and storage modulus (E'); b) Raman spectroscopy was used to describe the hierarchical cluster analysis (HCA). Assessments were performed before restoration placement and after restoring, and after 3 months of storage with thermocycling (100,000cy/5 °C and 55 °C). Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.12.002DOI Listing
December 2018
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Antibiotic elution and mechanical property of TiO nanotubes functionalized PMMA-based bone cements.

J Mech Behav Biomed Mater 2018 Nov 23;91:91-98. Epub 2018 Nov 23.

Institute of Chemical and Engineering Sciences, A⁎STAR (Agency for Science, Technology and Research), 1 Pesek Road, Singapore 627833, Jurong Island, Singapore; Department of Chemical and Biomolecular Engineering, The National University of Singapore, 4 Engineering Drive 4, Singapore 117576, Singapore. Electronic address:

To overcome the disadvantage of current antibiotic bone cements with low drug elution efficiency, the hollow nanostructured titanium-dioxide (TiO) nanotubes (TNTs) were formulated with antibiotic loaded bone cement to create nano diffusion networks, enabling enhanced release of antibiotic. By incorporation of TNTs into Poly(methyl methacrylate) (PMMA) based bone cement, more than 50% of loaded antibiotic (such as gentamicin or vancomycin) could be released in two months. As comparison, only about 5% of total drug release was achieved in the absence of TNTs. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.020DOI Listing
November 2018
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A shear assay study of single normal/breast cancer cell deformation and detachment from poly-di-methyl-siloxane (PDMS) surfaces.

J Mech Behav Biomed Mater 2018 Nov 15;91:76-90. Epub 2018 Nov 15.

Department of Mechanical Engineering, Worcester Polytechnic Institute (WPI), Worcester, MA 01609, USA; Department of Materials Science and Engineering, African University of Science and Technology, Km 10, Airport Road, Galadimawa, Abuja, Federal Capital Territory, Nigeria; Advanced Biotechnology Laboratory, Sheda Science and Technology Complex, Abuja, Nigeria. Electronic address:

This paper presents the results of a combined experimental and analytical/computational study of viscoelastic cell deformation and detachment from poly-di-methyl-siloxane (PDMS) surfaces. Fluid mechanics and fracture mechanics concepts are used to model the detachment of biological cells observed under shear assay conditions. The analytical and computational models are used to compute crack driving forces, which are then related to crack extension during the detachment of normal breast cells and breast cancer cells from PDMS surfaces that are relevant to biomedical implants. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.012DOI Listing
November 2018

Characterization of resilin-like proteins with tunable mechanical properties.

J Mech Behav Biomed Mater 2018 Nov 20;91:68-75. Epub 2018 Nov 20.

Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN 47907-2100, United States; Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907-2032, United States. Electronic address:

Resilin is an elastomeric protein abundant in insect cuticle. Its exceptional properties, which include high resilience and efficient energy storage, motivate its potential use in tissue engineering and drug delivery applications. Our lab has previously developed recombinant proteins based on the resilin-like sequence derived from Anopheles gambiae and demonstrated their promise as a scaffold for cartilage and vascular engineering. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.015DOI Listing
November 2018

Structural analysis of the frontal and parietal bones of the human skull.

J Mech Behav Biomed Mater 2018 Nov 1;90:689-701. Epub 2018 Nov 1.

Weapons and Materials Research Directorate, Army Research Laboratory, Aberdeen Proving Ground, MD 21005, United States. Electronic address:

Bone specimens were collected from the frontal and parietal bones of 4 adult, human skulls. The microstructure was characterized using microcomputed tomography (micro-CT) at about 6-μm resolution to map the change of porosity as a function of the depth, P(d), from the inner surface nearest to the brain to the outer surface nearest to the skin. A quantifiable method was developed using the measured P(d) to objectively distinguish between the three layers of the skull: the outer table, diploë , and inner table. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.035DOI Listing
November 2018

Optimization of bio-inspired bi-directionally corrugated panel impact-resistance structures: Numerical simulation and selective laser melting process.

J Mech Behav Biomed Mater 2018 Nov 27;91:59-67. Epub 2018 Nov 27.

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing 210016, PR China; Jiangsu Provincial Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic Components, Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing 210016, Jiangsu Province, PR China.

The telson (tail plate) of Stomatopoda (mantis shrimp) shows excellent impact resistance properties, and its special structure is an ideal prototype to mimic. In this paper, a series of bi-directionally corrugated panel (DCP) structures inspired by the telson of mantis shrimp was designed. The crush simulation of DCP structures with different structural parameters, namely wavelength (λ) and amplitude (A), was carried out using ANSYS LS-DYNA. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.026DOI Listing
November 2018

The viscoelastic behaviors of several kinds of cancer cells and normal cells.

J Mech Behav Biomed Mater 2018 Nov 30;91:54-58. Epub 2018 Nov 30.

College of Biological Science and Technology, Weifang Medical University, Weifang 261053, China. Electronic address:

The purpose of this study was to investigate the viscoelastic behaviors of cancer cells and normal cells using the micropipette aspiration technique combined with the standard linear viscoelastic solid model. The viscoelastic behaviors of pairs of cell lines (human skin cells and human skin cancer cells, human fetal lung fibroblasts and human lung cancer cells, human mammary fibroblasts and human breast cancer cells, and human hepatocyte cells and human hepatocellular carcinoma cells) were tested by the micropipette aspiration technique. The cellular viscoelastic parameters (the instantaneous modulus E, the equilibrium modulus associated with long term equilibrium E, and the apparent viscosity μ) were calculated using a Kelvin standard linear viscoelastic solid model. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.029DOI Listing
November 2018

Fabrication of alumina-PSZ composites via spark plasma sintering and their mechanical properties.

J Mech Behav Biomed Mater 2018 Nov 29;91:45-53. Epub 2018 Nov 29.

Department of Mechanical Engineering, Shizuoka University, 3-5-1, Johoku, Naka-ku, Hamamatsu 432-8561, Japan.

Alumina-partially stabilized zirconia (PSZ) composites were fabricated via spark plasma sintering (SPS) technique to produce biocompatible materials with superior mechanical properties. The volume fraction of the composites covered from 100% alumina to 100% PSZ. Their sintering state was examined by optical microscopy, density measurement, and X-ray diffraction, and dense composites without any reaction phases could be fabricated, irrespective of PSZ content. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.028DOI Listing
November 2018

Influence of nano-hydroxyapatite containing desensitizing toothpastes on the sealing ability of dentinal tubules and bonding performance of self-etch adhesives.

J Mech Behav Biomed Mater 2018 Nov 28;91:38-44. Epub 2018 Nov 28.

Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, 710004 Xi'an, China; Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, 710004 Xi'an, China; Department of Prosthodontics, College of Stomatology, Xi'an Jiaotong University, 710004 Xi'an, China. Electronic address:

Objectives: To evaluate the dentinal tubular occlusion of nano-hydroxyapatite (nHAp) containing desensitizing toothpastes and their influence on the resin-dentin bonding performance of two mild self-etch adhesives.

Materials And Methods: Mid-coronal dentin specimens were prepared from obtained intact human third molars. They were immersed in 1% citric acid for 20 s to expose the dentinal tubules to simulate sensitive teeth and then randomly divided into four groups. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S17516161183162
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http://dx.doi.org/10.1016/j.jmbbm.2018.11.021DOI Listing
November 2018
3 Reads

Bacterial leakage and bending moments of screw-retained, composite-veneered PEEK implant crowns.

J Mech Behav Biomed Mater 2018 Nov 28;91:32-37. Epub 2018 Nov 28.

Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Dental Materials and Biomaterial Research, Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Aßmannshauser Str. 4-6, 14197 Berlin, Germany. Electronic address:

Due to its elastic modulus close to bone, the high-performance material PEEK (polyetheretherketone) represents an interesting material for implant-supported dental prostheses. Besides a damping effect of masticatory forces, it might have a sealing effect against bacterial leakage of the implant-abutment interface (IAI). So far, PEEK has only been used for provisional implant crowns. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.027DOI Listing
November 2018

Mechanical and surface chemical analysis of retrieved breast implants from a single centre.

J Mech Behav Biomed Mater 2018 Nov 2;91:24-31. Epub 2018 Nov 2.

Division of Surgery and Interventional Science, Royal Free Campus, University College London, Pond Street, London NW3 2QG, United Kingdom.

Introduction: Breast implants are associated with complications such as capsular contracture, implant rupture and leakage often necessitating further corrective surgery. Re-operation rates have been reported to occur in up to 15.4% of primary augmentation patients and up to 27% in primary reconstructions patients within the first three years (Cunningham, 2007). Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.042DOI Listing
November 2018

Decellularisation affects the strain rate dependent and dynamic mechanical properties of a xenogeneic tendon intended for anterior cruciate ligament replacement.

J Mech Behav Biomed Mater 2018 Nov 26;91:18-23. Epub 2018 Nov 26.

iMBE, School of Mechanical Engineering University of Leeds, Leeds, UK.

Development of new replacement grafts for anterior cruciate ligament (ACL) repair requires mechanical testing to ensure they can provide joint stability following implantation. A decellularised porcine superflexor tendon (pSFT) has been developed previously as an alternative to current reconstruction methods and subjected to biomechanical analysis. The application of varied strain rates to biological tissues is known to alter their biomechanical properties, however the effects of decellularisation on strain rate dependent and dynamic mechanical behaviour of tissues have not been explored. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.023DOI Listing
November 2018

The denticulate ligament - Tensile characterisation and finite element micro-scale model of the structure stabilising spinal cord.

J Mech Behav Biomed Mater 2018 Nov 20;91:10-17. Epub 2018 Nov 20.

Department of Biomedical Engineering, Mechatronics and Theory of Mechanisms, Wroclaw University of Science and Technology, Ignacego Łukasiewicza 7/9, 50-371 Wrocław, Poland.

Background: Damage to the spinal cord is one of the most debilitating pathologies with considerable health, economic and social impact. Improved prevention, treatment and rehabilitation after spinal cord injury (SCI) requires the complex biomechanics of the spinal cord with all its structural elements and the injury mechanism to be understood. This comprehensive understanding will also allow development of models and tools enabling better diagnosis, surgical treatment with increased safety and efficacy and possible development of regenerative therapies. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.017DOI Listing
November 2018
1 Read

Forces and moments in cervical spinal column segments in frontal impacts using finite element modeling and human cadaver tests.

J Mech Behav Biomed Mater 2018 Oct 2;90:681-688. Epub 2018 Oct 2.

Cemter for NeuroTrauma Research, Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, WI, United States; Department of Orthopaedic Surgery,Medical College of Wisconsin, Milwaukee, WI, United States. Electronic address:

Experiments have been conducted using isolated tissues of the spine such as ligaments, functional units, and subaxial cervical spine columns. Forces and or moments under external loading can be obtained at the ends of these isolated/segmented preparations; however, these models require fixations at the end(s). To understand the response of the entire cervical spine without the artificial boundary/end conditions, it is necessary to use the whole body human cadaver in the experimental model. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.09.043DOI Listing
October 2018

Load-bearing capacity under fatigue and survival rates of adhesively cemented yttrium-stabilized zirconia polycrystal monolithic simplified restorations.

J Mech Behav Biomed Mater 2018 Nov 12;90:673-680. Epub 2018 Nov 12.

Faculty of Odontology, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil. Electronic address:

This study evaluated the fatigue failure load, number of cycles for failure and survival probability of 2nd and 3rd generation yttrium-stabilized zirconia (YSZ) adhesively cemented to a dentin analogue substrate. Disc-shaped specimens (n = 10; Ø = 10 mm; thickness = 1.0 mm) were produced from four 2nd generation YSZs (Lava Plus, 3M ESPE; Vita In-Ceram YZ-HT, VITA Zahnfabrik; Zirlux FC, Ivoclar Vivadent; Katana ML-HT, Kuraray) and two 3rd generation YSZs (Katana UTML and Katana STML, Kuraray). Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.009DOI Listing
November 2018
1 Read

Fretting damage of Ni-rich ultrafine grained NiTi superelastic wires.

J Mech Behav Biomed Mater 2018 Nov 20;90:655-664. Epub 2018 Nov 20.

División Física de Metales, Centro Atómico Bariloche, CNEA - Av. E. Bustillo 9500, 8400 S.C. de Bariloche, Argentina; CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), Argentina.

The effects of fretting on Ni-rich ultra-fine grained NiTi superelastic wires have been characterized. Fretting tests have been performed using wire on wire in 90° cross-cylinder configuration until 10 cycles in air at 25 °C. Constant displacement amplitude of 50 µm and normal loads of 10, 20 and 50 N were considered. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.019DOI Listing
November 2018
1 Read

Linear viscoelastic and microstructural properties of native male human skin and in vitro 3D reconstructed skin models.

J Mech Behav Biomed Mater 2018 Nov 17;90:644-654. Epub 2018 Nov 17.

Fluid Dynamics of Complex Biosystems, School of Life Sciences Weihenstephan, Technical University of Munich, Freising 85354, Germany. Electronic address:

The study reports first ever account of measurements of linear viscoelastic moduli under small amplitude oscillatory shear deformations, for commercially available juvenile and aged in vitro 3D reconstructed skin models. The results were compared with those of native male whole human and dermis-only foreskin samples, catering to a wide age group from 0.5 to 68 years, including samples from a 23-year-old male abdomen. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.013DOI Listing
November 2018
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Evaluation of the sintering temperature on the mechanical behavior of β-tricalcium phosphate/calcium silicate scaffolds obtained by gelcasting method.

J Mech Behav Biomed Mater 2018 Nov 17;90:635-643. Epub 2018 Nov 17.

Laboratory of Bioceramics (BIOCERAM), Institute of Science and Technology - ICT, Federal University of São Paulo - UNIFESP, 12231-280 São José dos Campos, SP, Brazil. Electronic address:

Scaffolds have been studied during the last decades as an alternative method to repair tissues. They are porous structures that act as a substrate for cellular growth, proliferation and differentiation. In this study, scaffolds of β-tricalcium phosphate with calcium silicate fibers were prepared by gel casting method in order to be characterized and validated as a better choice for bone tissue treatment. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S17516161183133
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http://dx.doi.org/10.1016/j.jmbbm.2018.11.014DOI Listing
November 2018
3 Reads

First tribological assessment of retrieved Oxinium patellofemoral prostheses.

J Mech Behav Biomed Mater 2018 Nov 20;90:665-672. Epub 2018 Nov 20.

School of Engineering, Newcastle University, NE1 7RU Newcastle upon Tyne, England, UK.

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.018DOI Listing
November 2018
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Quantifying machining outputs of pristine human teeth relevant to dental preparation procedures.

J Mech Behav Biomed Mater 2018 Nov 16;91:1-9. Epub 2018 Nov 16.

Department of Mechanical, Aerospace, and Nuclear Engineering Rensselaer Polytechnic Institute, Troy, NY 12180, USA. Electronic address:

Minimally-assisted tooth repair (MaTR) systems are envisioned to be capable of substituting for the skill of a dentist. If successfully developed, MaTR systems could enable lower-skilled dental technicians to provide dental care at a fraction of the overall medical cost. This paper explores a key initial step towards the development of such systems by quantifying the machining responses of pristine human teeth relevant to dental preparation procedures. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S17516161183116
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http://dx.doi.org/10.1016/j.jmbbm.2018.11.008DOI Listing
November 2018
1 Read

In vitro experimental and numerical study on biomechanics and stability of a novel adjustable hemipelvic prosthesis.

J Mech Behav Biomed Mater 2018 Nov 1;90:626-634. Epub 2018 Nov 1.

School of Mechatronics Engineering and Automation, Shanghai University, Shanghai, PR China. Electronic address:

Hemipelvic prostheses are used to reconstruct the damaged pelvis due to bone tumors and traumas. However, biomechanical properties of the reconstructed pelvis remain unclear, causing difficulties to implant development and prediction of surgical outcome. In this study, a novel adjustable hemipelvic prosthesis for the Type 1-3 pelvis resection was used to reconstruct the intact pelvic ring. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.036DOI Listing
November 2018

Optimization method for the determination of Mooney-Rivlin material coefficients of the human breasts in-vivo using static and dynamic finite element models.

J Mech Behav Biomed Mater 2018 Nov 22;90:615-625. Epub 2018 Nov 22.

Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hong Kong.

It has been a long-standing problem in the engineering design of bra for optimal support and shaping due to the difficulty of quantifying the hyper-elastic properties of human breasts. The objective of this study is to determine an optimal approach to obtain the non-linear properties of breast soft tissues and the corresponding deformations during motions. The Mooney-Rivlin material parameters of the breasts in-vivo were verified through an optimization process that involved iteratively changing the material coefficients with the integration of static and dynamic finite element models. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.016DOI Listing
November 2018

Functional polyhedral oligomeric silsesquioxane reinforced poly(lactic acid) nanocomposites for biomedical applications.

J Mech Behav Biomed Mater 2018 Nov 19;90:604-614. Epub 2018 Nov 19.

Department of Materials Science and Engineering, Jinan University, Guangzhou 510632, China.

Polyhedral oligomeric silsesquioxane reinforced poly (L-lactic acid) nanocomposites (PLLA/POSS) were prepared to overcome the insufficient mechanical properties of PLLA. In order to improve the compatibility between the nanofillers and matrix, PLLA chains were grafted onto the POSS nanoparticles via microwave-assisted ring opening polymerization (ROP). Herein, a series of interface-modified polyhedral oligomeric silsesquioxane (POSS-(PLLA)) nanoparticles with various PLLA tail lengths were synthesized and the influence of the structure and additional amount of POSS nanoparticles on the properties of PLLA based nanocomposites were studied. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.002DOI Listing
November 2018

Characterization of perfused and sectioned liver tissue in a full indentation cycle using a visco-hyperelastic model.

J Mech Behav Biomed Mater 2018 Nov 6;90:591-603. Epub 2018 Nov 6.

Department of Electrical and Computer Engineering, University of California, Los Angeles CA 90095, USA. Electronic address:

Realistic modeling of biologic material is required for optimizing fidelity in computer-aided surgical training and assistance systems. The modeling of liver tissue has remained challenging due to its nonlinear viscoelastic properties and high hysteresis of the stress-strain relation. While prior studies have described the behavior of liver tissue during the loading status (in elongation, compression, or indentation tests) or unloading status (in stress relaxation or creep tests), a hysteresis curve with both loading and unloading processes was incompletely defined. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S17516161183105
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http://dx.doi.org/10.1016/j.jmbbm.2018.11.006DOI Listing
November 2018
3 Reads

Edge chipping resistance of ceramics bonded to a dentine analogue.

J Mech Behav Biomed Mater 2018 Nov 12;90:587-590. Epub 2018 Nov 12.

Post-graduate Program in Dentistry, Dental School, University of Passo Fundo, Campus I, BR285, Passo Fundo, RS 99052-900, Brazil. Electronic address:

Objective: To evaluate the edge chip resistance (R) of two CAD/CAM monolithic ceramics (GC- IPS e.max CAD and YZ- Zenostar Zr Translucent) bonded to a dentine analogue substrate (G10- NEMA G10).

Methods: Plate-shaped specimens were prepared from GC and YZ ceramics and were either bonded (B) to G10 or attached (NB) to a universal testing machine for edge chipping test. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S17516161183142
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http://dx.doi.org/10.1016/j.jmbbm.2018.11.010DOI Listing
November 2018
2 Reads

Development of graphene oxide/calcium phosphate coating by pulse electrodeposition on anodized titanium: Biocorrosion and mechanical behavior.

J Mech Behav Biomed Mater 2018 Nov 16;90:575-586. Epub 2018 Nov 16.

Department of Chemistry, Faculty of Science, University of Maragheh, 55181-83111 Maragheh, Iran.

In this work, graphene oxide (GO) reinforcement was used to improve the strength and fracture toughness of the calcium phosphate (CaP) coating applied on the anodized titanium using pulse electrodeposition. Based on the results, the CaP coating consisted of mixed phases of octa-calcium phosphate (OCP), dicalcium phosphate dehydrate (DCPD) and hydroxyapatite (HAp); however, compositing of this coating with GO caused deposition of the pure HAp phase. Moreover, the nanohardness and Young's modulus of the CaP-GO coating increased over 52% and 41%, respectively, as compared to those measured for the GO-free coating. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.011DOI Listing
November 2018
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Characterization of low-shrinkage dental composites containing methacrylethyl-polyhedral oligomeric silsesquioxane (ME-POSS).

J Mech Behav Biomed Mater 2018 Oct 18;90:566-574. Epub 2018 Oct 18.

Analitical Laboratory of Restorative Biomaterials - LABiom-R, School of Dentistry, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil. Electronic address:

The aim of this study was to characterize low-shrinkage dental composites containing methacrylethyl-polyhedral oligomeric silsesquioxane (ME-POSS). Four experimental composites were manufactured, two of which contained organic matrixes of BisGMA-TEGDMA (70/30 wt% - BGC) and BisEMA-TEGDMA (80/20 wt% - BEC). The two other experimental composites replaced BisGMA and BisEMA with 25 wt% of ME-POSS (BGP and BEP). Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.028DOI Listing
October 2018
2 Reads

An interface damage model that captures crack propagation at the microscale in cortical bone using XFEM.

J Mech Behav Biomed Mater 2018 Oct 1;90:556-565. Epub 2018 Oct 1.

Department of Biomedical Engineering, Lund University, Box 118, SE-221 00 Lund, Sweden. Electronic address:

Reliable tools for fracture risk assessment are necessary to handle the challenge with an aging population and the increasing occurrence of bone fractures. As it is currently difficult to measure local damage parameters experimentally, computational models could be used to provide insight into how cortical bone microstructure and material properties contribute to the fracture resistance. In this study, a model for crack propagation in 2D at the microscale in cortical bone was developed using the extended finite element method (XFEM). Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.09.045DOI Listing
October 2018
4 Reads

Enhanced corrosion resistance and bonding strength of Mg substituted β-tricalcium phosphate/Mg(OH) composite coating on magnesium alloys via one-step hydrothermal method.

J Mech Behav Biomed Mater 2018 Nov 12;90:547-555. Epub 2018 Nov 12.

Department of Orthopedic Surgery, Changzheng Hospital, Second Military Medical University, Shanghai 200003, People's Republic of China. Electronic address:

To overcome the defect of high degradation rate of magnesium (Mg), bioactive coatings with compact structure, sufficient bonding strength and enhanced corrosion resistance are essential for Mg-based biodegradable implants. In this study, a dense Mg-substituted β-tricalcium phosphate and magnesium hydroxide (β-TCMP/Mg(OH)) composite coating was prepared on AZ31 alloy via one-step hydrothermal method. The influences of hydrothermal temperature on its composition, microstructure of the surface and interface, bonding strength and corrosion behavior were evaluated. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.007DOI Listing
November 2018

Compressibility of arterial wall - Direct measurement and predictions of compressible constitutive models.

J Mech Behav Biomed Mater 2018 Nov 5;90:538-546. Epub 2018 Nov 5.

Institute of Solid Mechanics, Mechatronics and Biomechanics, Brno University of Technology, Technicka 2896/2, 61669 Brno, Czech Republic.

Volumetric compressibility and Poisson's ratios of fibrous soft tissues are analyzed in this paper on the basis of constitutive models and experimental data. The paper extends the previous work of Skacel and Bursa (J Mech Behav Biomed Mater, 54, pp. 316-327, 2016), dealing with incompressible behaviour of constitutive models, to the area of compressibility. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.004DOI Listing
November 2018
2 Reads

Controlled mercerization of bacterial cellulose provides tunability of modulus and ductility over two orders of magnitude.

J Mech Behav Biomed Mater 2018 Nov 6;90:530-537. Epub 2018 Nov 6.

Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, United States; Department of Orthopedics, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, OH 44106, United States; Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106, United States. Electronic address:

Effects of mercerization process on plant-based cellulose is well studied in the literature whereas the effects of mercerization on mechanical properties of bacterial cellulose is not investigated. In this work bacterial cellulose (BC) was mercerized in NaOH solution with different molar concentrations of 0, 1.50, 1. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.005DOI Listing
November 2018
3 Reads

Tuning strain-induced γ-to-ε martensitic transformation of biomedical Co-Cr-Mo alloys by introducing parent phase lattice defects.

J Mech Behav Biomed Mater 2018 Nov 1;90:523-529. Epub 2018 Nov 1.

Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.

In this study, we examined the effect of pre-existing dislocation structures in a face-centered cubic γ-phase on strain-induced martensitic transformation (SIMT) to produce a hexagonal close-packed ε-phase in a hot-rolled biomedical Co-Cr-Mo alloy. The as-rolled microstructure was characterized by numerous dislocations as well as stacking faults and deformation twins. SIMT occurred just after macroscopic yielding in tensile deformation. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.038DOI Listing
November 2018
6 Reads

The performance of sol-gel silica coated Y-TZP for veneered and monolithic dental restorations.

J Mech Behav Biomed Mater 2018 Sep 27;90:515-522. Epub 2018 Sep 27.

Univ. Estadual Paulista (UNESP), Institute of Science and Technology at São José dos Campos, Department of Dental Materials and Prosthodontics, Eng. Francisco José Longo Avenue 777, 12245-000 São José dos Campos, SP, Brazil. Electronic address:

Objectives: The purpose of the study was to characterize the microstructure, constituents, and mechanical properties of mono and bilayered zirconia specimens infiltrated with silica by the sol gel method.

Methods: 180 zirconia discs (14-mm diameter) were divided in 3 groups (n = 60) according to thickness (1.2, 0. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.09.023DOI Listing
September 2018
7 Reads

Gating and inactivation of mechanosensitive channels of small conductance: A continuum mechanics study.

J Mech Behav Biomed Mater 2018 Nov 2;90:502-514. Epub 2018 Nov 2.

School of Chemical Engineering, Shaanxi Institute of Energy and Chemical Engineering, Northwest University, Xi'an, Xi'an 710069, PR China; Yonghong Zhang Family Center for Advanced Materials for Energy and Environment, Department of Earth and Environmental Engineering, Columbia University, New York, NY 10027, USA. Electronic address:

Mechanosensitive channels of small conductance (MscS) in Escherichia coli (E. coli) serve as a paradigm for understanding the gating behaviors of the MscS family of ion channels. In this work, we develop a continuum mechanics framework to explore the conformational states of MscS during the gating transition. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.040DOI Listing
November 2018
3 Reads

The effect of different preconditioning protocols on repeatability of bovine ACL stress-relaxation response in tension.

J Mech Behav Biomed Mater 2018 Nov 2;90:493-501. Epub 2018 Nov 2.

Department of Applied Physics, University of Eastern Finland, POB 1627, FI-70211 Kuopio, Finland. Electronic address:

Mechanical characterization of soft tissues such as ligaments remains challenging. There is variability in the measured material parameters of ligaments, most of which is related to natural tissue variability, but some of it can be a result of using different testing protocols. Generally preconditioning (cyclic loading-unloading) is performed prior to actual tests to reduce the experimental variability. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.041DOI Listing
November 2018
3 Reads

Effect of carbon fiber type on monotonic and fatigue properties of orthopedic grade PEEK.

J Mech Behav Biomed Mater 2018 Nov 3;90:484-492. Epub 2018 Nov 3.

Department of Mechanical Engineering, University of California, Berkeley, 2121 Etcheverry Hall, Berkeley, CA 94720, United States.

Carbon-fiber reinforced (CFR) PEEK implants are used in orthopedic applications ranging from fracture fixation plates to spinal fusion cages. Documented implant failures and increasing volume and variety of CFR PEEK implants warrant a clearer understanding of material behavior under monotonic and cyclic loading. To address this issue, we conducted monotonic and fatigue crack propagation (FCP) experiments on orthopedic grade unfilled PEEK and two formulations of CFR PEEK (PAN- and pitch-based carbon fibers). Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.033DOI Listing
November 2018
4 Reads

Surface functionalization of polylactic acid fibers with alendronate groups does not improve the mechanical properties of fiber-reinforced calcium phosphate cements.

J Mech Behav Biomed Mater 2018 Nov 3;90:472-483. Epub 2018 Nov 3.

Department of Regenerative Biomaterials, Radboud University Medical Center, Philips van Leydenlaan 25, Nijmegen 6525 EX, the Netherlands. Electronic address:

Calcium phosphate cements (CPCs) are frequently used as synthetic bone substitute, but their intrinsic low fracture toughness impedes their application in highly loaded skeletal sites. However, fibers can be used to reduce the brittleness of these CPCs provided that the affinity between the fibers and cement matrix facilitates the transfer of loads from the matrix to the fibers. The aim of the present work was to improve the interface between hydrophobic polylactic acid (PLA) microfibers and hydrophilic CPC. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.003DOI Listing
November 2018
5 Reads

Tribological behavior of Ti-6Al-4V against cortical bone in different biolubricants.

J Mech Behav Biomed Mater 2018 Oct 29;90:460-471. Epub 2018 Oct 29.

School of Chemistry and Chemical Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, 200240 Shanghai, China. Electronic address:

Titanium alloys (Ti-6Al-4V) are promising materials as bone implants in clinical surgeries owing to their excellent performances. However, wear debris caused by the tribological behavior of the cortical bone and titanium alloy interface were found to be paramount for implant stability. The contact environment between the cortical bone and Ti-6Al-4V in vivo has been considered to affect the tribological behavior. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.031DOI Listing
October 2018

Designed for resistance to puncture: The dynamic response of fish scales.

J Mech Behav Biomed Mater 2018 Nov 2;90:451-459. Epub 2018 Nov 2.

Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA; Department of Mechanical Engineering, University of Washington Seattle, WA, USA. Electronic address:

Natural dermal armors are serving as a source of inspiration in the pursuit of "next-generation" structural materials. Although the dynamic strain response of these materials is arguably the most relevant to their performance as armors, limited work has been performed in this area. Here, uniaxial tension and transverse puncture tests were performed on specimens obtained from the scales of Asian carp over strain rates spanning seven decades, from 10 to 10 s. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.037DOI Listing
November 2018
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Dynamics of a capsule flowing in a tube under pulsatile flow.

J Mech Behav Biomed Mater 2018 Oct 25;90:441-450. Epub 2018 Oct 25.

Department of Civil and Environmental Engineering, Brigham Young University, Provo, UT 84602, USA.

We analyze numerically the behavior of a deformable micro-capsule confined in a pipe under a pulsatile flow. The capsule moves and is deformed by the action of a pulsatile flow inside the tube with a non-null mean velocity. This configuration can be found in the nature and in many bioengineering systems where artificial capsules are driven by micro-pumps through micro-channels. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.025DOI Listing
October 2018
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Ultra-thin occlusal veneers bonded to enamel and made of ceramic or hybrid materials exhibit load-bearing capacities not different from conventional restorations.

J Mech Behav Biomed Mater 2018 Sep 27;90:433-440. Epub 2018 Sep 27.

Clinic of Fixed and Removable Prosthodontics and Dental Material Science, Center of Dental Medicine, University of Zurich, Switzerland.

Objectives: The objective of this study was to test whether or not the load-bearing capacity of occlusal veneers bonded to enamel and made of ceramic or hybrid materials does differ from those of porcelain-fused-to-metal or lithium disilicate glass ceramic crowns.

Material And Methods: In 80 human molars occlusal enamel was removed without extending into the dentin in order to mimic substance defects caused by attrition. The restorations were digitally designed at a standardized thickness of either 0. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.09.041DOI Listing
September 2018
6 Reads

Mechanical performance of conical implant-abutment connections under different cyclic loading conditions.

J Mech Behav Biomed Mater 2018 Nov 1;90:426-432. Epub 2018 Nov 1.

School of Dentistry, National Yang-Ming University, No. 155, Section 2, Li-Non Street, Taipei 112, Taiwan. Electronic address:

Objectives: Conical implant-abutment connections are popular for its anti-bending performance; on the other hand, the torsional and axial forces also play important roles in occlusion. However, so far there were scarce studies on their effects on connection stability. Therefore, this study seeks to investigate the mechanical performance of conical connections under different cyclic loading conditions. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.039DOI Listing
November 2018
5 Reads

Effect of tribochemical silica coating or multipurpose products on bonding performance of a CAD/CAM resin-based material.

J Mech Behav Biomed Mater 2018 Nov 2;90:417-425. Epub 2018 Nov 2.

Department of Endodontics, Jiangsu Key Laboratory of Oral Diseases, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China. Electronic address:

Objectives: Nanocomposite ceramics have been widely used in clinical practice; however, a standard, recommended bonding protocol has not been determined yet. The present study aimed to evaluate application of tribochemical silica coating or multipurpose products on bonding performance of a CAD/CAM resin-based material (known as nanocomposite ceramic).

Materials And Methods: Nanocomposite ceramic specimens were fabricated and assigned into 11 groups to build bonded specimens (n = 15) according to surface treatments (none; air particle abrasion with 50-μm alumina followed by application of a silane coupling agent or a universal adhesive; tribochemical silica coating followed by application of a silane coupling agent or a universal adhesive) and resin luting cements (conventional resin cement, RelyX Veneer; self-adhesive resin cement RelyX Unicem) used. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.034DOI Listing
November 2018
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The mechanical response of commercially available bone simulants for quasi-static and dynamic loading.

J Mech Behav Biomed Mater 2018 Oct 30;90:404-416. Epub 2018 Oct 30.

School of Engineering and Information Technology, The University of New South Wales, ACT 2600, Australia.

Bone is a complex hierarchal structured material with varying porosity and mechanical properties. In particular, human cranial bone is essentially a natural composite consisting of low porosity outer and inner tables and a cancellous interior, or diploë. Experimental studies of biomechanically accurate cranial bone analogues are of high importance for biomechanical, forensics, and clinical researchers, which could improve the understanding and prevention of traumatic injury. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.032DOI Listing
October 2018
3 Reads

Mechanical behaviour of extremely tough TZP bioceramics.

J Mech Behav Biomed Mater 2018 Nov 3;90:395-403. Epub 2018 Nov 3.

Universität Stuttgart, IFKB, Allmandring 7B, 75233 Stuttgart, Germany.

Tetragonal Zirconia Polycrystals (TZP) is attractive for structural biomedical applications because of their excellent mechanical properties at room-temperature, which include high strength, fracture toughness and wear resistance. In this work, zirconia stabilized with Y or Yb or Yb+Nd, all containing 0.5 vol. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.11.001DOI Listing
November 2018
5 Reads

Shock absorbing ability in healthy and damaged cartilage-bone under high-rate compression.

J Mech Behav Biomed Mater 2018 Oct 16;90:388-394. Epub 2018 Oct 16.

Department of Biomedical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia. Electronic address:

Articular cartilage is a soft tissue that distributes the loads in joints and transfers the compressive load to the underlying bone. At high rate and magnitudes of mechanical loading, cartilage and subchondral bone together are susceptible to damage. In addition, any disruption to the cartilage's structure, caused by injury, trauma or disorder such as osteoarthritis (OA), can alter the mechanism of load transfer from the cartilage to the underlying bone. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S17516161183063
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http://dx.doi.org/10.1016/j.jmbbm.2018.10.023DOI Listing
October 2018
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Control of bacterial attachment by fracture topography.

J Mech Behav Biomed Mater 2018 Oct 21. Epub 2018 Oct 21.

School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, Brisbane, Australia. Electronic address:

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. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.020DOI Listing
October 2018
3 Reads

Effect of light-curing protocols on the mechanical behavior of bulk-fill resin composites.

J Mech Behav Biomed Mater 2018 Oct 25;90:381-387. Epub 2018 Oct 25.

Department of Restorative Dentistry, State University of Londrina - UEL, Rua Pernambuco 540, 86020-120 Londrina, PR, Brazil.

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/cm (20 s); Xp - irradiance of 3200 mW/cm (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). Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.026DOI Listing
October 2018
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Dentin pretreatment with 45S5 and niobophosphate bioactive glass: Effects on pH, antibacterial, mechanical properties of the interface and microtensile bond strength.

J Mech Behav Biomed Mater 2018 Oct 25;90:374-380. Epub 2018 Oct 25.

Department of Oral Biology and Medical Sciences, Division of Biomaterials, Faculty of Dentistry, University of British Columbia (UBC), 368-2199 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 1Z3.

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. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2018.10.029DOI Listing
October 2018
3 Reads