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https://www.readbyqxmd.com/read/29036917/the-effect-of-tio%C3%A2-doped-photocatalytic-nano-additives-on-the-hydration-and-microstructure-of-portland-and-high-alumina-cements
#1
María Pérez-Nicolás, Íñigo Navarro-Blasco, José M Fernández, José Ignacio Alvarez
Mortars with two different binders (Portland cement (PC) and high alumina cement (HAC)) were modified upon the bulk incorporation of nano-structured photocatalytic additives (bare TiO₂, and TiO₂ doped with either iron (Fe-TiO₂) or vanadium (V-TiO₂)). Plastic and hardened state properties of these mortars were assessed in order to study the influence of these nano-additives. Water demand was increased, slightly by bare TiO₂ and Fe-TiO₂, and strongly by V-TiO₂, in agreement with the reduction of the particle size and the tendency to agglomerate...
October 14, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29035549/water-as-a-probe-of-colloidal-properties-of-cement
#2
Francesca Ridi, Monica Tonelli, Emiliano Fratini, Sow-Hsin Chen, Piero Baglioni
Cement is produced by mixing mineral phases based on calcium silicates and aluminates with water. The hydration reaction of the mixture leads to a synthetic material with outstanding properties that can be used as a binder for construction applications. Despite the importance of cement in society, for a long time, the chemical reactions involved in its hydration remained poorly understood due to the complexity of hydration processes, nanostructure and transport phenomena. This feature article reviews the recently obtained results using water as "a probe" to detail the essential features in the setting process...
October 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29033529/fracture-resistance-of-different-primary-anterior-esthetic-crowns
#3
Manar Zaki Al Shobber, Thamer A Alkhadra
PURPOSE: Investigate and compare fracture resistance of four commercially available esthetic crowns. METHODS: Sixty-four anterior crowns were used: NuSmile Primary crowns (NuSmile, Houston, Tex. USA) (16); Preveneered Cheng Crowns, (Orthodontic Technologies Inc., Houston, TX) (16); NuSmile ZR (NuSmile, Houston, Tex. USA); and Cheng Crowns zirconia (Orthodontic Technologies Inc., Houston, TX). Crowns were mounted and cemented on a negative replica and placed under servo hydraulic mechanical universal testing machine...
October 2017: Saudi Dental Journal
https://www.readbyqxmd.com/read/29033290/nonvascularized-cartilage-grafts-versus-vascularized-cartilage-flaps-comparison-of-cartilage-quality-6%C3%A2-months-after-transfer-and-isolated-from-surrounding%C3%A2-bone-ingrowth
#4
James P Higgins, Farzad Borumandi, Heinz K Bürger, Mehmet Emre Benlidayı, Anna Vasilyeva, Leman Sencar, Sait Polat, Alexander J Gaggl
PURPOSE: Subchondral perfusion of osteochondral grafts has been shown to be important in preventing long-term cartilage degeneration. In carpal reconstruction, subchondral perfusion from the graft bed is limited. This study's purpose was to compare the histological characteristics of cartilage in osteochondral grafts supported by synovial imbibition alone to cartilage of vascularized osteochondral flaps that have both synovial and vascular pedicle perfusion. METHODS: Two adjacent osteochondral segments were harvested on the medial femoral trochlea in domestic 6- to 8-month-old pigs...
October 12, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/29033173/source-apportionment-for-fine-particulate-matter-in-a-chinese-city-using-an-improved-gas-constrained-method-and-comparison-with-multiple-receptor-models
#5
Guoliang Shi, Jiayuan Liu, Haiting Wang, Yingze Tian, Jie Wen, Xurong Shi, Yinchang Feng, Cesunica E Ivey, Armistead G Russell
PM2.5 is one of the most studied atmospheric pollutants due to its adverse impacts on human health and welfare and the environment. An improved model (the chemical mass balance gas constraint-Iteration: CMBGC-Iteration) is proposed and applied to identify source categories and estimate source contributions of PM2.5. The CMBGC-Iteration model uses the ratio of gases to PM as constraints and considers the uncertainties of source profiles and receptor datasets, which is crucial information for source apportionment...
October 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29033018/irradiated-recycled-plastic-as-a-concrete-additive-for-improved-chemo-mechanical-properties-and-lower-carbon-footprint
#6
Carolyn E Schaefer, Kunal Kupwade-Patil, Michael Ortega, Carmen Soriano, Oral Büyüköztürk, Anne E White, Michael P Short
Concrete production contributes heavily to greenhouse gas emissions, thus a need exists for the development of durable and sustainable concrete with a lower carbon footprint. This can be achieved when cement is partially replaced with another material, such as waste plastic, though normally with a tradeoff in compressive strength. This study discusses progress toward a high/medium strength concrete with a dense, cementitious matrix that contains an irradiated plastic additive, recovering the compressive strength while displacing concrete with waste materials to reduce greenhouse gas generation...
October 9, 2017: Waste Management
https://www.readbyqxmd.com/read/29032826/the-effect-of-internal-roughness-and-bonding-on-the-fracture-resistance-and-structural-reliability-of-lithium-disilicate-ceramic
#7
Paul de Kok, Gabriel K R Pereira, Sara Fraga, Niek de Jager, Andressa B Venturini, Cornelis J Kleverlaan
OBJECTIVE: To evaluate the effect of internal roughness and bonding on the load to failure and structural reliability (Weibull analysis) of a lithium disilicate-based glass ceramic under different testing scenarios. METHODS: IPS e.max CAD blocks (Ivoclar Vivadent AG) were shaped into cylinders (N=100), crystalized according to the manufacturer's instructions, and randomly assigned into two surface conditions: (1) polished surface (600-grit SiC polish papers), and (2) a roughened surface (air-abrasion with 50μm Al2O3)...
October 9, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29032313/influence-of-platform-diameter-in-the-reliability-and-failure-mode-of-extra-short-dental-implants
#8
Dimorvan Bordin, Edmara T P Bergamo, Estevam A Bonfante, Vinicius P Fardin, Paulo G Coelho
PURPOSE: To evaluate the influence of implant diameter in the reliability and failure mode of extra-short dental implants. MATERIALS AND METHODS: Sixty-three extra-short implants (5mm-length) were allocated into three groups according to platform diameter: Ø4.0-mm, Ø5.0-mm, and Ø6.0-mm (21 per group). Identical abutments were torqued to the implants and standardized crowns cemented. Three samples of each group were subjected to single-load to failure (SLF) to allow the design of the step-stress profiles, and the remaining 18 were subjected to step-stress accelerated life-testing (SSALT) in water...
September 21, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29031993/the-gdf5-mutant-bb-1-enhances-the-bone-formation-induced-by-an-injectable-plga-fiber-reinforced-brushite-forming-cement-in-a-sheep-defect-model-of-lumbar-osteopenia
#9
Francesca Gunnella, Elke Kunisch, Stefan Maenz, Victoria Horbert, Long Xin, Joerg Mika, Juliane Borowski, Sabine Bischoff, Harald Schubert, Andre Sachse, Bernhard Illerhaus, Jens Günster, Jörg Bossert, Klaus D Jandt, Frank Plöger, Raimund W Kinne, Olaf Brinkmann, Matthias Bungartz
BACKGROUND CONTEXT: Targeted delivery of osteoinductive bone morphogenetic proteins (BMPs; e.g., GDF5) in bioresorbable calcium phosphate cement (CPC), potentially suitable for vertebroplasty/kyphoplasty of osteoporotic vertebral fractures, may be required to counteract augmented local bone catabolism and support complete bone regeneration. The biologically optimized GDF5 mutant BB-1 may represent an attractive drug candidate for this purpose. PURPOSE: The aim of the current study was to test an injectable, poly (l-lactide-co-glycolide) acid (PLGA)-fiber reinforced, brushite-forming cement (CPC) containing low-dose BB-1 in a sheep lumbar osteopenia model...
October 12, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29031975/new-polymorph-form-of-dexamethasone-acetate
#10
Ronaldo Pedro da Silva, Mateus Felipe Schuchter Ambrósio, Luciana Almeida Piovesan, Maria Clara Ramalho Freitas, Daniel Lima Marques de Aguiar, Bruno Araújo Cautiero Horta, Eugenio Epprecht, Rosane Aguiar da Silva San Gil, Lorenzo do Canto Visentin
A new monohydrated polymorph of dexamethasone acetate (DEX-II) was crystallized and its crystal structure characterized. The different analytical techniques used for describing its structural and vibrational properties were: single crystal (SCXRD) and polycrystal (PXRD) X-ray diffraction, solid state nuclear magnetic resonance (solid-state NMR), infrared spectroscopy (IR). A Hirshfeld surface (HS) analysis was carried out through self-arrangement cemented by H-bonds observed in this new polymorph. This new polymorph form appeared because of self-arrangement via classical hydrogen bonds around the water molecule...
October 11, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29031824/the-exeter-trauma-stem-a-radiographic-follow-up-at-minimum-of-five-years-post-implantation
#11
A M Kassam, L Tillotson, S L Whitehouse, J Charity
INTRODUCTION: The Exeter Trauma Stem (ETS) has been recommended by National Institute of Clinical Excellence (NICE) guidelines in the United Kingdom as a proven, cemented stem. A single laboratory study in the literature has raised possible concerns about the polished finish of the ETS and subsequent potential for accelerated loosening although there is little clinical evidence to support or refute this. METHODS: The aim of this study was to assess clinical outcomes of the ETS at a minimum of five years post implantation...
October 7, 2017: Injury
https://www.readbyqxmd.com/read/29030463/efficacy-and-safety-of-the-target-puncture-technique-for-treatment-of-osteoporotic-vertebral-compression-fractures-with-intravertebral-clefts
#12
Weibo Yu, De Liang, Xiaobing Jiang, Zhensong Yao, Ting Qiu, Linqiang Ye
OBJECTIVE: To compare the efficacy and safety of our target puncture technique with the traditional technique during percutaneous kyphoplasty (PKP) for osteoporotic vertebral compression fractures (OVCFs) with intravertebral clefts (IVCs). METHODS: 104 patients treated with PKP for single OVCFs with IVCs were retrospectively reviewed. All patients were divided into three groups: cleft filling by the traditional technique (Group A, n=18); interdigitated filling (Group B, n=50); and overfilling by the target technique (Group C, n=36)...
November 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29028849/the-effect-of-resin-cement-type-and-thermomechanical-aging-on-the-retentive-strength-of-custom-zirconia-abutments-bonded-to-titanium-inserts
#13
Merve Bankoğlu Gu Ngör
PURPOSE: The purpose of this study was to investigate the effect of resin cement type on the retentive strength of custom zirconia abutments bonded to titanium inserts. MATERIALS AND METHODS: Sixty implant (4.3 mm diameter and 11.5 mm length) and custom zirconia abutment (15 mm height and 2 mm wall thickness) pairs were used to form six groups (n = 10 each). Three different resin cements were used to bond the zirconia abutments and titanium inserts: Panavia F 2...
October 13, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29027926/nanocomposites-for-machining-tools
#14
REVIEW
Daria Sidorenko, Pavel Loginov, Leon Mishnaevsky, Evgeny Levashov
Machining tools are used in many areas of production. To a considerable extent, the performance characteristics of the tools determine the quality and cost of obtained products. The main materials used for producing machining tools are steel, cemented carbides, ceramics and superhard materials. A promising way to improve the performance characteristics of these materials is to design new nanocomposites based on them. The application of micromechanical modeling during the elaboration of composite materials for machining tools can reduce the financial and time costs for development of new tools, with enhanced performance...
October 13, 2017: Materials
https://www.readbyqxmd.com/read/29026135/interventions-for-treating-displaced-intracapsular-femoral-neck-fractures-in-the-elderly-a-bayesian-network-meta-analysis-of-randomized-controlled-trials
#15
Bin-Fei Zhang, Peng-Fei Wang, Hai Huang, Yu-Xuan Cong, Hu Wang, Yan Zhuang
Displaced intracapsular femoral neck (AO type 31 B2/3) fractures have various treatments, including internal fixation (IF), unipolar uncemented hemiarthroplasty (HA), bipolar uncemented HA, unipolar cemented HA, bipolar cemented HA, uncemented total hip replacement (THR), and cemented THR. Systematic literature retrieval was performed from the databases to compare them in a network meta-analysis. Forty studies (85 arms) containing 6141 patients were included. Overall, our network meta-analysis rank the orders of 7 procedures in reoperation, mortality, dislocation and infection, which indicates that IF may provide the highest reoperation incidence, unipolar cemented HA may provide the lowest reoperation incidence; uncemented THR contributes the highest dislocation incidence; and bipolar uncemented HA provides the lowest infection incidence...
October 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29025611/carbon-fiber-reinforced-intramedullary-nailing-in-musculoskeletal-tumor-surgery-a-national-multicentric-experience-of-the-italian-orthopaedic-society-siot-bone-metastasis-study-group
#16
Andrea Piccioli, Raimondo Piana, Michele Lisanti, Alberto Di Martino, Barbara Rossi, Francesco Camnasio, Marco Gatti, Pietro Maniscalco, Franco Gherlinzoni, Maria Silvia Spinelli, Davide Maria Donati, Roberto Biagini, Rodolfo Capanna, Vincenzo Denaro
INTRODUCTION: Carbon fiber reinforced (CFR) implants have been proposed for the treatment of fractures or impending fractures of the long bones in the oncology patient. Aim of this study is to present the largest cohort of oncology patients operated by CFR nailing by the Italian Orthopaedic Society (SIOT) Bone Metastasis Study Group. METHODS: 53 adult oncology patients were operated on with a CFR-PEEK nail. All the data from adjuvants therapies were collected. Bone callus formation, response to radiotherapy, relapse or progression of the osteolysis were recorded...
October 2017: Injury
https://www.readbyqxmd.com/read/29024120/remodeling-and-modeling-based-bone-formation-with-teriparatide-versus-denosumab-a-longitudinal-analysis-from-baseline-to-3-months-in-the-ava-study
#17
David W Dempster, Hua Zhou, Robert R Recker, Jacques P Brown, Christopher P Recknor, E Michael Lewiecki, Paul D Miller, Sudhaker D Rao, David L Kendler, Robert Lindsay, John H Krege, Jahangir Alam, Kathleen A Taylor, Thomas E Melby, Valerie A Ruff
There has been renewed interest of late in the role of modeling-based formation (MBF) during osteoporosis therapy. Here we describe early effects of an established anabolic (teriparatide) versus antiresorptive (denosumab) agent on remodeling-based formation (RBF), MBF, and overflow MBF (oMBF) in human transiliac bone biopsies. Postmenopausal women with osteoporosis received subcutaneous teriparatide (n = 33, 20 µg/day) or denosumab (n = 36, 60 mg once/6 months), open-label for 6 months at 7 US and Canadian sites...
October 12, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/29023292/silicone-facial-prosthesis-a-preliminary-report-on-silicone-adhesion-to-magnet
#18
Soung Min Kim, Yun Ju Cho, Mi Young Eo, Jong Sic Kim, Suk Keun Lee
Although a silicone facial prosthesis has many advantages, silicone's limited cementation with resin or metal has caused many maxillofacial reconstructive surgeons and prosthodontists concern regarding the use of silicone-based facial prostheses. This study demonstrates 1 representative silicone facial prosthesis patient with magnet cementation to silicone using plastic clay, which will be applied to various maxillofacial prosthesis strategies in the near future.
October 11, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29022974/the-mechanism-of-cesium-ions-immobilization-in-the-nanometer-channel-of-calcium-silicate-hydrate-a-molecular-dynamics-study
#19
Jinyang Jiang, Pan Wang, Dongshuai Hou
The cement-based matrices are preferred candidates in disposing nuclear waste due to the immobilization role of the calcium-silicate-hydrate (C-S-H) gel. To better understand the immobilization mechanism of cementitious materials, molecular dynamics was utilized to investigate the intensity distribution, local structure and dynamics properties of Cs(+) ions in the vicinity of the calcium silicate surface. The strong inner-sphere adsorbed cesium ions were restricted by coordinated oxygen atoms in bridging and pair silicate tetrahedron and water molecules were fixed in the silicate channel by H-bonds network...
October 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29022206/effect-of-an-alkaline-environment-on-the-engineering-behavior-of-cement-stabilized-solidified-zn-contaminated-soils
#20
Jingjing Liu, Fusheng Zha, Yongfeng Deng, Kerui Cui, Xueqin Zhang
Although the stabilization/solidification method has been widely used for remediation of heavy metal-contaminated soils in recent decades, the engineering behavior and mobility of heavy metal ions under alkaline groundwater conditions are still unclear. Therefore, the unconfined compressive strength test (UCS) combined with toxicity characteristic leaching procedure (TCLP) and general acid neutralization capacity (GANC) was used to investigate the effects of alkalinity (using NaOH to simulate alkalinity in the environment) on the mechanical and leaching characteristics of cement-solidified/stabilized (S/S) Zn-contaminated soils...
October 12, 2017: Environmental Science and Pollution Research International
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