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https://www.readbyqxmd.com/read/28213278/identifying-overarching-excipient-properties-towards-an-in-depth-understanding-of-process-and-product-performance-for-continuous-twin-screw-wet-granulation
#1
N Willecke, A Szepes, M Wunderlich, J P Remon, C Vervaet, T De Beer
The overall objective of this work is to understand how excipient characteristics influence the process and product performance for a continuous twin-screw wet granulation process. The knowledge gained through this study is intended to be used for a Quality by Design (QbD)-based formulation design approach and formulation optimization. A total of 9 preferred fillers and 9 preferred binders were selected for this study. The selected fillers and binders were extensively characterized regarding their physico-chemical and solid state properties using 21 material characterization techniques...
February 14, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28212979/degradation-of-optical-and-surface-properties-of-resin-based-composites-with-distinct-nanoparticle-sizes-but-equivalent-surface-area
#2
Vinícius Esteves Salgado, Larissa Maria Cavalcante, Rafael R Moraes, Harry B Davis, Jack L Ferracane, Luis Felipe Schneider
OBJECTIVE: To determine the optical and surface properties of model resin-based composites made with distinct nanoparticle sizes but equalized surface area, among them, before and after ageing. METHODS: Model resin-based composites based on BisGMA/TEGDMA (50:50mol%) were loaded with three different fumed silica filler content (7nm/examethyldisilazane, 12nm/octylsilane, and 16nm/dimethylchlorosilane), but with equivalent surface area (BET method). The optical and surface properties of the disk-shaped specimens were measured in 24h after photoactivation (baseline) and repeated after water storage (90days at 37°C), and after abrasion (20,000 cycles of brushing)...
February 14, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28210379/two-crosslinking-technologies-for-superficial-reticular-dermis-injection-a-comparative-ultrasound-and-histologic-study
#3
Patrick Micheels, Stéphanie Besse, Didier Sarazin
Background: Few hyaluronic acid fillers have been developed for superficial injection. Objective: To compare the diffusion and integration properties of cohesive polydensified matrix and Vycross® technology hyaluronic acid fillers with lidocaine following injection into the superficial reticular dermis. Methods and materials: Two subjects received two injections each of cohesive polydensified matrix and Vycross® hyaluronic acid (0.2mL/site) in the superficial reticular dermis of the buttock under ultrasound control...
January 2017: Journal of Clinical and Aesthetic Dermatology
https://www.readbyqxmd.com/read/28208504/structure-diffusion-relationship-of-polymer-membranes-with-different-texture
#4
Monika Krasowska, Anna Strzelewicz, Gabriela Dudek, Michał Cieśla
Two-dimensional diffusion in heterogenic composite membranes, i.e., materials comprising polymer with dispersed inorganic fillers, composed of ethylcellulose and magnetic powder is studied. In the experimental part, the morphology of membranes is described by the following characteristics: the amount of polymer matrix, the fractal dimension of polymer matrix, the average size of polymer matrix domains, the average number of obstacles in the proximity of each polymer matrix pixel. The simulation work concentrates on the motion of a particle in the membrane environment...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28205372/zein-based-composites-in-biomedical-applications
#5
Merve Demir, Laura Ramos-Rivera, Raquel Silva, Showan N Nazhat, Aldo R Boccaccini
Considerable research efforts have been devoted to zein based biomaterials for tissue engineering and other biomedical applications over the past decade. The attention given to zein based polymers is primarily attributed to their biocompatibility and biodegradability. However, due to the relatively low mechanical properties of these polymers, numerous inorganic compounds (e.g, hydroxyapatite, calcium phosphate, bioactive glasses, natural clays) have been considered in combination with zein to create composite materials in an attempt to enhance zein mechanical properties...
February 16, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28203492/safety-and-effectiveness-of-juv%C3%A3-derm-ultra-plus-injectable-gel-in-correcting-severe-nasolabial-folds-in-chinese-subjects
#6
Dong Li, Yun Xie, Qin Li, Jiaming Sun, Ping Jiang, Yi Jia, Diane K Murphy, Qingfeng Li
BACKGROUND: Hyaluronic acid dermal fillers are effective in correcting severe nasolabial folds (NLFs) in non-Asian populations. We assessed safety and effectiveness of Juvéderm Ultra Plus in a Chinese population. METHODS: This double-blind study randomized Chinese subjects with severe NLFs to Juvéderm Ultra Plus (24 mg/mL) in 1 NLF and Restylane injectable gel (20 mg/mL) in the other NLF. NLFs were evaluated using the validated 5-point photonumeric Allergan NLF Severity Scale (0 is "no wrinkle" and 4 is "very deep wrinkle")...
January 2017: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/28203015/-effect-of-thermal-conductivity-on-apical-sealing-ability-of-4-dental-gutta-percha-cones
#7
C Fan, C Y Yuan, J C Zhang, X Y Wang
OBJECTIVE: To investigate the effect of thermal conductivity on the apical sealing ability of different dental gutta-percha cones during the warm vertical condensation obturation. METHODS: Four kinds of dental gutta-percha cones were used in this study: Bio-GP points (BP, B&L, Korea), large-tapered gutta-percha (DP, DENTSPLY, America), PROTAPER Universal gutta-percha points (DPP, DENTSPLY, America) and mtwo gutta-percha points (VP, VDW, Germany). Volume differences method was used to determine the main components and the thermal conductivity determinator was used to measure the thermal conductivity of these dental gutta-percha cones...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28203012/-effects-of-saliva-contamination-on-bond-strength-of-resin-resin-interfaces
#8
H J Guo, C Z Gao, F Lin, W Liu, L Yue
OBJECTIVE: To estimate the bond strength between different resin composite interfaces, and to evaluate the effect of saliva contamination and management with the contamination on the bond strength. METHODS: Two commercial resin composites containing different types of fillers (AP-X: barium-glass; P60: quartz) were tested in this study. The basic composite blocks were made of AP-X. After wet-ground flatted, the experimental groups were divided into three groups according to the surface treatment: (1)Direct bonding group: the bonding surface was rinsed with distilled water for 20 s, then dried with oil-free air for 20 s; (2)Saliva contamination group: the bonding surface was bathed in saliva for 30 min, then distilled water was rinsed for 20 s and dried with oil-free air for 20 s; (3)Saliva contamination and 75% ethanol wiping group: bonding surface bathed in saliva for 30 min, then wipe the surface with 75% ethanol, distilled water rinse for 20 s and dry with oil-free air for 20 s; The control group was made of the basic composite bulks of AP-X directly bonding with composite P60...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28197886/spot-urine-protein-to-creatinine-ratio
#9
EDITORIAL
Guido Filler, Shih-Han Susan Huang
In a recent article in Pediatric Nephrology, EM Yang and colleagues (Pediatr Nephrol 2017: doi: 10.1007/s00467-016-3587-6 ) published a retrospective cross-sectional study involving a cohort of 442 children with an mean estimated glomerular filtration rate of >60 mL/min/1.73 m(2). The authors measured 24-h urine protein excretion (24-h UProt) alongside the morning spot urine protein to creatinine ratio (Prot/Cr) in this group of patients. While the Prot/Cr may be the only feasible way to routinely estimate the daily protein excretion of a young child, inter-individual variability in childrens' urinary creatinine excretion (UCr) may heavily influence the result...
February 14, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/28194869/the-effect-of-brushing-and-aging-on-the-staining-and-smoothness-of-resin-composites
#10
Lisandra R Mozzaquatro, Camila S Rodrigues, Marina R Kaizer, Maristela Lago, André Mallmann, Letícia B Jacques
OBJECTIVES: To evaluate the staining and smoothness of resin composites undergoing aging in water or red wine and simulated brushing with or without dentifrice. METHODS: The resin composites (Z250 microfilled and Z350XT nanofilled) were tested according to aging media (deionized water or red wine) and surface treatment (no brushing, brushed with water, or brushed with dentifrice). Specimens (n = 10) were subjected to three aging cycles (5 days) of continuous immersion in the aging media; each followed by simulated brushing (585 strokes)...
February 13, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28193511/investigation-of-dielectric-breakdown-in-silica-epoxy-nanocomposites-using-designed-interfaces
#11
Michael Bell, Timothy Krentz, J Keith Nelson, Linda Schadler, Ke Wu, Curt Breneman, Su Zhao, Henrik Hillborg, Brian Benicewicz
Adding nano-sized fillers to epoxy has proven to be an effective method for improving dielectric breakdown strength (DBS). Evidence suggests that dispersion state, as well as chemistry at the filler-matrix interface can play a crucial role in property enhancement. Herein we investigate the contribution of both filler dispersion and surface chemistry on the AC dielectric breakdown strength of silica-epoxy nanocomposites. Ligand engineering was used to synthesize bimodal ligands onto 15nm silica nanoparticles consisting of long epoxy compatible, poly(glycidyl methacrylate) (PGMA) chains, and short, π-conjugated, electroactive surface ligands...
February 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28192532/role-of-arf-gtpases-in-fungal-morphogenesis-and-virulence
#12
Hayet Labbaoui, Stéphanie Bogliolo, Vikram Ghugtyal, Norma V Solis, Scott G Filler, Robert A Arkowitz, Martine Bassilana
Virulence of the human fungal pathogen Candida albicans depends on the switch from budding to filamentous growth, which requires sustained membrane traffic and polarized growth. In many organisms, small GTPases of the Arf (ADP-ribosylation factor) family regulate membrane/protein trafficking, yet little is known about their role in fungal filamentous growth. To investigate these GTPases in C. albicans, we generated loss of function mutants in all 3 Arf proteins, Arf1-Arf3, and 2 Arf-like proteins, Arl1 and Arl3...
February 13, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28190815/structural-analysis-of-strontium-in-human-teeth-treated-with-surface-pre-reacted-glass-ionomer-filler-eluate-by-using-extended-x-ray-absorption-fine-structure-analysis
#13
Motohiro Uo, Takahiro Wada, Kiyotaka Asakura
The bioactive effects of strontium released from surface pre-reacted glass-ionomer (S-PRG) fillers may aid in caries prevention. In this study, the local structure of strontium taken up by teeth was estimated by extended X-ray absorption fine structure analysis. Immersing teeth into S-PRG filler eluate increased the strontium content in enamel and dentin by more than 100 times. The local structure of strontium in enamel and dentin stored in distilled water was the same as that in synthetic strontium-containing hydroxyapatite (SrHAP)...
February 11, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28183629/mechanical-properties-and-in-vivo-study-of-modified-hydroxyapatite-polyetheretherketone-biocomposites
#14
Rui Ma, Qiankuan Li, Lin Wang, Xianghua Zhang, Lin Fang, Zhongkuan Luo, Bai Xue, Lei Ma
Polyether ether ketone (PEEK) has received much attention for its excellent mechanical properties and biocompatibility. Here, the silane coupling agent KH560 [γ-(2,3-epoxypropoxy)propyltrimethoxysilane] is used for graft modification of bioactive HA (hydroxyapatite) particles and for preparing HA/PEEK composites via a hot-press molding method. The prepared HA/PEEK composites were tested for their mechanical properties with SEM (scanning electron microscopy), infrared spectroscopy, and thermo-analysis. The results show that silane coupling KH-560 modifies HA successfully and that the tensile strengths of HA/PEEK and m-HA/PEEK composites indicate an increasing and then a decreasing tendency with increasing HA contents...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183613/pdlla-honeycomb-like-scaffolds-with-a-high-loading-of-superhydrophilic-graphene-multi-walled-carbon-nanotubes-promote-osteoblast-in-vitro-functions-and-guided-in-vivo-bone-regeneration
#15
Edmundo Silva, Luana Marotta Reis de Vasconcellos, Bruno V M Rodrigues, Danilo Martins Dos Santos, Sergio P Campana-Filho, Fernanda Roberta Marciano, Thomas J Webster, Anderson Oliveira Lobo
Herein, we developed honeycomb-like scaffolds by combining poly (d, l-lactic acid) (PDLLA) with a high amount of graphene/multi-walled carbon nanotube oxides (MWCNTO-GO, 50% w/w). From pristine multi-walled carbon nanotubes (MWCNT) powders, we produced MWCNTO-GO via oxygen plasma etching (OPE), which promoted their exfoliation and oxidation. Initially, we evaluated PDLLA and PDLLA/MWCNTO-GO scaffolds for tensile strength tests, cell adhesion and cell viability (with osteoblast-like MG-63 cells), alkaline phosphatase (ALP, a marker of osteoblast differentiation) activity and mineralized nodule formation...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183604/wear-behaviour-of-uhmwpe-reinforced-by-carbon-nanofiller-and-paraffin-oil-for-joint-replacement
#16
Samy Yousef, Annamaria Visco, Giovanna Galtieri, Davide Nocita, Claudia Espro
The majority of artificial joints incorporate biomedical grade Ultra High Molecular Weight Poly Ethylene (UHMWPE), whose wear is considered most important in controlling service time of the whole joint. The aim of this work was to improve wear resistance of UHMWPE through the addition of 0.5-2.0wt% of Carbon Nano Filler (CNF) and 2% wt of Paraffin Oil (PO) using ball milling (BM) and extrusion techniques (EX). The wear tests on these nanocomposites were conducted by a pin on disc in dry (air) and wet media (simulated synovial fluid or artificial lubricant, and bovine synovial fluid or natural lubricant)...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28182040/the-effect-of-acrylate-based-dental-adhesive-solvent-content-on-microleakage-in-composite-restorations
#17
Mahboubeh Mirzakhani, Sayed Mostafa Mousavinasab, Mohammad Atai
BACKGROUND: This study aimed to evaluate the effect of different percentages of ethanol solvent of an experimental methacrylate-based dentin bonding agent containing polyhedral oligomeric silsesquioxanes (POSS) on the microleakage of resin composite restorations. MATERIALS AND METHODS: In this experimental study, 42 extracted human premolar teeth used and 84 standard Class V cavities were prepared on the buccal and lingual surfaces of the teeth. The teeth were divided into 6 groups of 7...
November 2016: Dental Research Journal
https://www.readbyqxmd.com/read/28181795/water-responsive-shape-recovery-induced-buckling-in-biodegradable-photo-cross-linked-poly-ethylene-glycol-peg-hydrogel
#18
Abhijit Vijay Salvekar, Wei Min Huang, Rui Xiao, Yee Shan Wong, Subbu S Venkatraman, Kiang Hiong Tay, Ze Xiang Shen
The phenomenon of recovering the permanent shape from a severely deformed temporary shape, but only in the presence of the right stimulus, is known as the shape memory effect (SME). Materials with such an interesting effect are known as shape memory materials (SMMs). Typical stimuli to trigger shape recovery include temperature (heating or cooling), chemical (including water/moisture and pH value), and light. As a SMM is able not only to maintain the temporary shape but also to respond to the right stimulus when it is applied, via shape-shifting, a seamless integration of sensing and actuation functions is achieved within one single piece of material...
February 9, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28181617/3d-printable-highly-conductive-hybrid-composites-employing-chemically-reinforced-complex-dimensional-fillers-and-thermoplastic-triblock-copolymers
#19
Yejin Jo, Ju Young Kim, So-Yun Kim, Yeong-Hui Seo, Kwang-Suk Jang, Su Yeon Lee, Sungmook Jung, Beyong-Hwan Ryu, Hyun-Suk Kim, Jang-Ung Park, Youngmin Choi, Sunho Jeong
The use of 3-dimensional (3D) printable conductive materials has gained significant attention for various applications because of their ability to form unconventional geometrical architectures that cannot be realized with traditional 2-dimensional printing techniques. To resolve the major requisites in printed electrodes for practical applications (including high conductivity, 3D printability, excellent adhesion, and low-temperature processability), we have designed a chemically-reinforced multi-dimensional filler system comprising amine-functionalized carbon nanotubes, carboxyl-terminated silver nanoparticles, and Ag flakes, with the incorporation of a thermoplastic polystyrene-polyisoprene-polystyrene (SIS) triblock copolymer...
February 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/28181467/quantifying-alumina-nanoparticle-dispersion-in-hybrid-carbon-fiber-composites-using-photoluminescent-spectroscopy
#20
Imad Hanhan, Alex Selimov, Declan Carolan, Ambrose C Taylor, Seetha Raghavan
Composites modified with nanoparticles are of interest to many researchers due to the large surface-area-to-volume ratio of nano-scale fillers. One challenge with nanoscale materials that has received significant attention is the dispersion of nanoparticles in a matrix material. A random distribution of particles often ensures good material properties, especially as it relates to the thermal and mechanical performance of composites. Typical methods to quantify particle dispersion in a matrix material include optical, scanning electron, and transmission electron microscopy...
February 2017: Applied Spectroscopy
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