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Journal of Materials Science. Materials in Medicine

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https://www.readbyqxmd.com/read/29149422/interrelationships-among-hydrogen-permeation-physiochemical-properties-and-early-adsorption-abilities-of-titanium
#1
Fang Jia, Lei Zhou, Wangxi Wu
This study aimed to investigate if the titanium samples with low hydrogen permeation which treated with a novel etching combination: phosphoric acid and sodium fluoride could influence the surface physiochemical properties and early adsorption ability. Titanium samples were treated with three different concentrations of the new formula, as groups A, B and C, and treated with the traditional etching formula, as group T. Zeta potential, contact angle, X-ray photoelectron spectroscopy (XPS) and fibronectin (FN)/vitronectin (VN) adsorption of Sprague-Dawley (SD) rat tibial osteotomies in the initial 30min and MG-63 adsorption in the initial 24 h were detected...
November 17, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29143185/osteogenic-prospective-of-deriving-human-dental-stem-cells-in-collagen-matrix-boost
#2
Tong-Jing Fang, Ding-Han Wang, Chia-Yu Wang, Raju Poongodi, Nien-Hsien Liou, Jiang-Chuan Liu, Ming-Lun Hsu, Po-Da Hong, Shih-Fang Yang, Meng-Lun Liu
Stem cells derived from oral tissue represent a highly attractive alternative source for clinical bone regeneration because they can be collected by non-invasive or minimally invasive procedures. Herein, we describe the human dental stem cells (DSCs) deriving from buccal fat pads (BFP), dental pulp (DP) of impacted teeth, and periodontal ligaments (PDL) to obtain BFPSCs, DPSCs, and PDLSCs, respectively. Cells were purified with selected medium and expanded through passages in stem cell culture medium. Purified cells were characterized for stemness by their growth rate, immunostaining, and multilineage differentiation ability...
November 15, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29143139/effect-of-protein-adsorption-layers-and-solution-treatments-on-hydroxyapatite-deposition-on-polystyrene-plate-surfaces-in-simulated-body-fluids
#3
Kazutoshi Iijima, Ayako Iizuka, Ryo Suzuki, Hitomi Ueno-Yokohata, Nobutaka Kiyokawa, Mineo Hashizume
We have developed a method to functionalize polystyrene (PS) cell culture plates with hydroxyapatite (HAp) via protein adsorption layers such as human serum albumin (HSA) in simulated body fluids (SBFs). In order to investigate the versatility the method, in this study the effect of protein adsorption layers on HAp deposition on PS plate surfaces in SBF was evaluated. Pretreatments with alternate soaking process (ASP) using solutions containing calcium ions and phosphate ions followed by incubation with SBF for 24 h resulted in HAp deposition on PS plates with adsorption layers of HSA, type I collagen, hen egg white lysozyme, and poly L-glutamic acid, an acidic protein analogue: the deposition behaviors were correlated with adsorption ability and charge state of proteins...
November 15, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29138940/silk-fibroin-pellethane%C3%A2-cardiovascular-patches-effect-of-silk-fibroin-concentration-on-vascular-remodeling-in-rat-model
#4
Pinkarn Chantawong, Takashi Tanaka, Akiko Uemura, Kazumi Shimada, Akira Higuchi, Hirokazu Tajiri, Kohta Sakura, Tomoaki Murakami, Yasumoto Nakazawa, Ryou Tanaka
Life-threatening cardiovascular anomalies require surgery for structural repair with cardiovascular patches. The biomaterial patch, derived from Bombyx mori silk fibroin (SF), is used as an alternative material due to its excellent tissue affinity and biocompatibility. However, SF lacks the elastomeric characteristics required for a cardiovascular patch. In order to overcome this shortcoming, we combined the thermoplastic polyurethane, Pellethane® (PU) with SF to develop an elastic biocompatible patch. Therefore, the purpose of this study was to investigate the feasibility of the blended SF/PU patch in a vascular model...
November 14, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29116465/hemostatic-gauze-based-on-chitosan-and-hydroquinone-preparation-characterization-and-blood-coagulation-evaluation
#5
Roberta Cassano, Maria Luisa Di Gioia, Silvia Mellace, Nevio Picci, Sonia Trombino
This work concerns on the preparation and performance evaluation of a new chitosan hydroquinone based gauze for hemostatic use. Chitosan and hydroquinone were firstly connected by etherification and then linked to the pre-carboxylate gauze. The functionalized material and the chitosan-hydroquinone ether were characterized by Fourier Transform Infrared (FT-IR) Spectroscopy and Differential Scanning Calorimetry (DSC). FT-IR results showed that an esterification occurred on carboxylic group of the gauze. The gauze functionalization degree was also evaluated by volumetric analysis...
November 7, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29101660/comparison-of-bone-healing-and-outcomes-between-allogenous-bone-chip-and-hydroxyapatite-chip-grafts-in-open-wedge-high-tibial-osteotomy
#6
O-Sung Lee, Kyung Jae Lee, Yong Seuk Lee
Allogenous bone chips and hydroxyapatite (HA) chips have been known as good options for filling an inevitable void after open wedge high tibial osteotomy (OWHTO). However, there are concerns regarding bone healing after the use of these grafts. The purpose of this study was to compare the bone healing represented by the osteoconductivity and absorbability between allogenous bone chips and HA chips in OWHTO. The outcomes of bone healing of 53 patients who received an allogenous bone chip graft and 41 patients who received an HA chip graft were retrospectively evaluated, and the results were compared between the two groups...
November 3, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29027159/correction-to-multifunctional-decoration-of-alpha-tocopheryl-succinate-based-np-for-cancer-treatment-effect-of-tpp-and-ltvspwy-peptide
#7
Raquel Palao-Suay, María Rosa Aguilar, Francisco J Parra-Ruiz, Sergio Martín-Saldaña, Nathan A Rohner, Susan N Thomas, Julio San Román
No abstract text is available yet for this article.
November 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29071440/reduction-of-the-relative-centrifugal-force-influences-cell-number-and-growth-factor-release-within-injectable-prf-based-matrices
#8
Simon Wend, Alica Kubesch, Anna Orlowska, Sarah Al-Maawi, Niklas Zender, Andre Dias, Richard J Miron, Robert Sader, Patrick Booms, C James Kirkpatrick, Joseph Choukroun, Shahram Ghanaati
Platelet rich fibrin (PRF) is a blood concentrate system obtained by centrifugation of peripheral blood. First PRF matrices exhibited solid fibrin scaffold, more recently liquid PRF-based matrix was developed by reducing the relative centrifugation force and time. The aim of this study was to systematically evaluate the influence of RCF (relative centrifugal force) on cell types and growth factor release within injectable PRF- in the range of 60-966 g using consistent centrifugation time. Numbers of cells was analyzed using automated cell counting (platelets, leukocytes, neutrophils, lymphocytes and monocytes) and histomorphometrically (CD 61, CD- 45, CD-15+, CD-68+, CD-3+ and CD-20)...
October 25, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29039619/evaluation-of-corrosion-behavior-in-artificial-saliva-of-2507-and-2205-duplex-stainless-steel-for-orthodontic-wires-before-and-after-heat-treatment
#9
Ali Sabea Hammood, Ahmed Faraj Noor, Mohammed Talib Alkhafagy
The present study investigates comparison between corrosion behavior of 2507 and 2205 DSS in artificial saliva for orthodontic wires. The heat treatment is necessary for 2507 and 2205 duplex stainless steel to remove or dissolve intermetallic phases, removed segregation and to relieve any residual thermal stress in DSS which may be formed during production processes. The corrosion behavior of a 2507 and 2205 DSS in artificial saliva was studied by SEM, HV test and potentiodynamic measurements. The results indicate that the corrosion resistance mainly depends on presence of secondary phases (sigma phase) and ferrite /austenite ratio, it's revealed that the corrosion resistance of 2507 DSS higher than 2205 DSS in artificial saliva at 37 °C...
October 17, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29039618/sterilizing-photocurable-materials-by-irradiation-preserving-uv-curing-properties-of-photopolymers-following-e-beam-gamma-or-x-ray-exposure
#10
Jane F Emerson, Yasamin Abbaszadeh, Jonathan N Lo, Zois Tsinas, Jonas Pettersson, Pamela Ward, Mohamad I Al-Sheikhly
We have developed novel photopolymer gels to function as separators in blood collection tubes. By incorporating antioxidants such as α-tocopherol and nitroxides (TEMPO and TEMPOL), the new formulation can be sterilized with electron beam or gamma rays at a dose level of 17 kGy, without inducing premature curing of the photopolymers. For the blood separator gels that contain α-tocopherol, our results show that α-tocopherol plays a decisive role in impeding C-centered free radical propagation reactions through an H(-)transfer mechanism...
October 17, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29039617/the-electrical-properties-and-glass-transition-of-some-dental-materials-after-temperature-exposure
#11
Agnieszka Marcinkowska, Marlena Gauza-Wlodarczyk, Leszek Kubisz, Wieslaw Hedzelek
The physicochemical properties of dental materials will remain stable only when these materials in question are resistant to the changes in the oral cavity. The oral environment is subject to large temperature variations. The aim of the study was the assessment of electrical properties and glass transition of some dental materials after temperature exposure. Composite materials, compomers, materials for temporary prosthetic replacement and resin-based pit and fissure sealants were used in the study. The method used was electric conductivity of materials under changing temperature...
October 17, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29027611/preparation-of-flexible-bone-tissue-scaffold-utilizing-sea-urchin-test-and-collagen
#12
Naga Vijaya Lakshmi Manchinasetty, Sho Oshima, Masanori Kikuchi
Gonads of sea urchin are consumed in Japan and some countries as food and most parts including its tests are discarded as marine wastes. Therefore, utilization of them as functional materials would reduce the waste as well as encourage Japanese fishery. In this study, magnesium containing calcite granules collected from sea urchin tests were hydrothermally phosphatized and the obtained granules were identified as approximately 82% in mass of magnesium containing β-tricalcium phosphate and 18% in mass of nonstoichiometric hydroxyapatite, i...
October 13, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29027051/cell-response-of-flexible-pmma-derivatives-supremacy-of-surface-chemistry-over-substrate-stiffness
#13
Elke Van De Walle, Ine Van Nieuwenhove, Winnok De Vos, Heidi Declercq, Peter Dubruel, Sandra Van Vlierberghe
The present work reports on the development of a range of poly(methyl methacrylate)/poly(ethylene glycol) (PMMAPEG)-based materials, characterized by different elasticity moduli in order to study the influence of the substrate's mechanical properties on the response of human umbilical vein endothelial cells (HUVECs). To render the selected materials cell-interactive, a polydopamine (PDA)/gelatin type B (Gel B) coating was applied. Prior to the in vitro assay, the success of the PDA and Gel B immobilization onto the materials was confirmed using X-ray photoelectron spectroscopy (XPS) as reflected by the nitrogen percentages measured for the materials after PDA and Gel B deposition...
October 12, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29022190/in-vivo-study-of-a-bioactive-nanoparticle-gelatin-composite-scaffold-for-bone-defect-repair-in-rabbits
#14
Guojin Hou, Fang Zhou, Yan Guo, Zhongwei Yang, Ailing Li, Chen Wang, Dong Qiu
The purpose is to study the in vivo bioactivity of this scaffold and verify its ability to simulate the characteristics of cancellous bone. Twenty-four adult New Zealand white rabbits were divided into three groups. Bone defects above the femoral condylar of both sides were created. A newly designed bioactive nanoparticle-gelatin composite scaffold was implanted to the experimental side, while the control side was left without implantation. The repair of bone defect was monitored by X-ray examination, gross observation, Micro-CT examination and histological observation of the area of bone defect 4, 8 and 12 weeks after surgery...
October 11, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28986683/hydroxyapatite-chitosan-biocomposites-synthesized-in-the-simulated-body-fluid-and-their-drug-loading-studies
#15
Tugba Basargan, Nalan Erdol-Aydin, Gulhayat Nasun-Saygili
Hydroxyapatite (HAp) is a bioceramic applied in the biomedical areas, such as matrices for drug release control. Chitosan (CTS), a natural polymer, is another material has been widely investigated for its potential use in the drug delivery systems. In this study, the composites of HAp-CTS are produced in order to investigate their drug loading and release studies. First of all, HAp-CTS composites are produced in the presence of simulated body fluid (SBF). Analysis confirmed the structure of HAp-CTS composites...
October 6, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28980174/a-24-month-evaluation-of-a-percutaneous-osseointegrated-limb-skin-interface-in-an-ovine-amputation-model
#16
Sujee Jeyapalina, James Peter Beck, Jayant Agarwal, Kent N Bachus
Percutaneous osseointegrated (OI) prostheses directly connect an artificial limb to the residual appendicular skeleton via a permanently implanted endoprosthesis with a bridging connector that protrudes through the skin. The resulting stoma produces unique medical and biological challenges. Previously, a study using a large animal amputation model indicated that infection could be largely prevented, for at least a 12-month period, but the terminal epithelium continued to downgrow. The current study was undertaken to test the longer-term efficacy of this implant construct to maintain a stable skin-implant interface for 24 months...
October 4, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28980112/formation-of-persisters-in-streptococcus-mutans-biofilms-induced-by-antibacterial-dental-monomer
#17
Suping Wang, Chenchen Zhou, Biao Ren, Xiaodong Li, Michael D Weir, Radi M Masri, Thomas W Oates, Lei Cheng, Hockin K H Xu
Antibacterial monomers can combat oral biofilm acids and caries; however, little is known on whether quaternary ammonium monomers (QAMs) would induce drug persistence in oral bacteria. The objectives of this study were to investigate the interactions of Streptococcus mutans (S. mutans) with dimethylaminohexadecyl methacrylate (DMAHDM), and determine for the first time whether DMAHDM could induce persisters in S. mutans. DMAHDM was synthesized using a modified Menschutkin reaction. Dose-dependent killing curves and time-dependent killing curves of planktonic S...
October 4, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28956214/size-controlled-ultrafine-ceo2-nanoparticles-produced-by-the-microwave-assisted-route-and-their-antimicrobial-activity
#18
Waleed M Al-Shawafi, Numan Salah, Ahmed Alshahrie, Youssri M Ahmed, Said S Moselhy, Ahmed H Hammad, Mohammad Asif Hussain, Adnan Memic
Cerium oxide (CeO2) nanoparticles (NPs) have a wide range of biological and biomedical applications. This work describes a new methodology for producing ultrafine, highly uniform NPs with controlled sizes using the chemical microwave assisted route. The size of CeO2-NPs decreased from 10 to 5 nm by increasing the molar ratio of cerium nitrate Ce(NO3)3.(6H2O) to that of hexamethylenetetramine (C6H12N) from 1:20 to 20:20. Detailed information about their structural characterization was obtained from the XRD, UV-visible, photoluminescence, Raman spectroscopy, SEM, TEM and AFM...
September 27, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28956213/initial-stage-of-the-biofilm-formation-on-the-niti-and-ti6al4v-surface-by-the-sulphur-oxidizing-bacteria-and-sulphate-reducing-bacteria
#19
Beata Cwalina, Weronika Dec, Joanna K Michalska, Marzena Jaworska-Kik, Sebastian Student
The susceptibility to the fouling of the NiTi and Ti6Al4V alloys due to the adhesion of microorganisms and the biofilm formation is very significant, especially in the context of an inflammatory state induced by implants contaminated by bacteria, and the implants corrosion stimulated by bacteria. The aim of this work was to examine the differences between the sulphur-oxidizing bacteria (SOB) and sulphate-reducing bacteria (SRB) strains in their affinity for NiTi and Ti6Al4V alloys. The biofilms formed on alloy surfaces by the cells of five bacterial strains (aerobic SOB Acidithiobacillus thiooxidans and Acidithiobacillus ferrooxidans, and anaerobic SRB Desulfovibrio desulfuricans-3 strains) were studied using scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM)...
September 27, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28956212/sensing-of-micropillars-by-osteoblasts-involves-complex-intracellular-signaling
#20
Caroline Moerke, Petra Mueller, J Barbara Nebe
Topographical material surface features are sensed by cells and provoke a large range of cellular responses. We recognized earlier, that at micropillar topographies in the range of 5 µm, the osteoblasts attempt to phagocytize the pillars resulted in increased energy requirements and reduced osteoblast marker expression, e.g., collagen type I and osteocalcin. However, the precise cellular signaling transducing the topographic information into the cell and evoking phagocytic processes remained unknown. Here, we could show that the RhoA/ROCK signaling is involved in the transduction of the topography-mediated cellular reactions...
September 27, 2017: Journal of Materials Science. Materials in Medicine
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