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impression material

Daniel Ramirez, Yusaku Suto, Nataly Carolina Rosero-Navarro, Akira Miura, Kiyoharu Tadanaga, Franklin Jaramillo
Organic-inorganic hybrid perovskite materials have recently been investigated in a variety of applications, including solar cells, light emitting devices (LEDs), and lasers because of their impressive semiconductor properties. Nevertheless, the perovskite structure has the ability to host extrinsic elements, making its application in the battery field possible. During the present study, we fabricated and investigated the electrochemical properties of three-dimensional (3D) methylammonium lead mixed-halide CH3 NH3 PbI3- x Brx and two-dimensional (2D) propylammonium-methlylammonium lead bromide (CH3 NH3 )2 (CH3 (CH2 )2 NH3 )2 Pb3 Br10 hybrid perovskite thin films as electrode materials for Li-ion batteries...
March 21, 2018: Inorganic Chemistry
Mohamed Shehata Draz, Hadi Shafiee
Viruses are the smallest known microbes, yet they cause the most significant losses in human health. Most of the time, the best-known cure for viruses is the innate immunological defense system of the host; otherwise, the initial prevention of viral infection is the only alternative. Therefore, diagnosis is the primary strategy toward the overarching goal of virus control and elimination. The introduction of a new class of nanoscale materials with multiple unique properties and functions has sparked a series of breakthrough applications...
2018: Theranostics
Zoheir Elkahtib
BACKGROUND: Most health-care organisations are increasingly interested in assessing the quality of their services. Patient satisfaction has a central role in the quality assessment in health care because it reflects the appropriateness of services from the clients' perspectives. The aim of this study was to assess the level of satisfaction in patients with non-communicable diseases (mainly diabetes and hypertension) who receive services from UNRWA health centres in Gaza governorates. METHODS: In this cross-sectional study we chose a random sample of participants who presented to the randomly selected six health centres for treatment of non-communicable diseases...
February 21, 2018: Lancet
Srabanti Ghosh, Laurence Ramos, Hynd Remita
Materials are the key roadblocks for the commercialization of energy conversion devices in fuel cells and solar cells. Significant research has focused on tuning the intrinsic properties of materials at the nanometer scale. The soft template mediated controlled fabrication of advanced nanostructured materials is attracting considerable interest due to the promising applications of these materials in catalysis and electrocatalysis. Swollen hexagonal lyotropic liquid crystals (SLCs) consist of oil-swollen surfactant-stabilized 1D, 2D or 3D nanometric assemblies regularly arranged in an aqueous solvent...
March 16, 2018: Nanoscale
Stefanie Amend, Roland Frankenberger, Susanne Lücker, Eugen Domann, Norbert Krämer
OBJECTIVES: The present study aimed to establish Lactobacillus casei in a completely automated Streptococcus mutans-based artificial mouth model and to investigate secondary caries inhibiting properties of glass ionomer cements / resin composite groups in vitro. METHODS: Sixty extracted, caries-free human third molars were used for preparation of standardized class-V-cavities. Specimens were restored with a resin-modified (Photac Fil; PF) as well as a conventional glass ionomer cement (Ketac Molar; KM) and one resin composite bonded with and without conduction of etch-and-rinse technique (Prime&Bond NT, Ceram X mono; C+ERT, C)...
March 12, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Igor Poltavsky, Robert A DiStasio, Alexandre Tkatchenko
Nuclear quantum effects (NQE), which include both zero-point motion and tunneling, exhibit quite an impressive range of influence over the equilibrium and dynamical properties of molecules and materials. In this work, we extend our recently proposed perturbed path-integral (PPI) approach for modeling NQE in molecular systems [I. Poltavsky and A. Tkatchenko, Chem. Sci. 7, 1368 (2016)], which successfully combines the advantages of thermodynamic perturbation theory with path-integral molecular dynamics (PIMD), in a number of important directions...
March 14, 2018: Journal of Chemical Physics
Xu Zou, Qing Sun, Yuxin Zhang, Guo-Dong Li, Yipu Liu, Yuanyuan Wu, Lan Yang, Xiaoxin Zou
Amorphous Ni-Mn bimetallic hydroxide film on the three-dimensional nickle foam (NF)-supported conductive Ni3 S2 nanosheets (denoted as Ni-Mn-OH@Ni3 S2 /NF) is successfully synthesized by an ultrafast process (5 s). The fascinating structural characteristic endows Ni-Mn-OH@Ni3 S2 /NF electrodes better electrochemical performance. The specific capacitance of 2233.3 F g-1 at a current density of 15 A g-1 can achieve high current density charge and discharge at 20/30 A g-1 that the corresponding capacitance is 1529...
March 14, 2018: Scientific Reports
S Suresh, Gautam E Unni, M Satyanarayana, A Sreekumaran Nair, V P Mahadevan Pillai
Engineering photons on a nanoscale via guidance and localization by metal nanostructures has a profound influence on the performance of devices that try to mimic the process of photosynthesis. The conventional route for the synthesis of plasmonic nanoparticles and their integration into the porous structure of the photoanode either directly or after being capped with a dielectric material not only adds to the complexity but also to the cost of the cell. The present study introduces the concept of a plasmonic blocking layer that concurrently acts as a light harvester and an electron-blocking layer in a dye-sensitized solar cell (DSSC), wherein the plasmonic silver nanoparticles are incorporated into an Nb2 O5 blocking layer by a simple one-step process...
March 14, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Renato Sussumu Nishioka, Leandro Ruivo De Santis, Gabriela Nogueira De Melo Nishioka, Alberto Noriyuki Kojima, Francisley Ávila Souza
PURPOSE: This in vitro study assessed the accuracy of multiple implant-level impression techniques (open tray and closed tray) for the fabrication of 3-unit implant prostheses with strain gauge (SG) analysis. MATERIALS AND METHODS: A polyurethane master model was designed to simulate a clinical situation. Two rigid custom trays were fabricated for the model. The impression material used was polysulfide. Transfer implant impressions were made using 2 techniques; ten tapered copings not splinted (custom closed tray) and ten square copings splinted with acrylic-resin (custom open tray)...
March 9, 2018: Implant Dentistry
Jianjun Zhou, Xionghui Ji, Xiaohui Zhou, Jialin Ren, Yaochi Liu
A novel magnetic bio-adsorbent (MCIA) was developed, characterized and tested for its Cd(II) removal from aqueous solution. MCIA could be easily separated from the solution after equilibrium adsorption due to its super-paramagnetic property. The functional and magnetic bio-material was an attractive adsorbent for the removal of Cd(II) from aqueous solution owing to the abundant adsorption sites, amino-group and oxygen-containing groups on the surface of Cyclosorus interruptus. The experimental results indicated that the MCIA exhibited excellent adsorption ability and the adsorption process was spontaneous and endothermic...
March 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Ju-Hyoung Lee
Due to the increased esthetic demands, custom zirconia post-and-cores have recently become popular. A post-and-core pattern with acrylic resin or wax is scanned using a laboratory scanner for the design of a definitive post-and-core restoration. This procedure requires additional time and material handling experience. If a scan post is used for an intracanal digital impression, substantial initial investments for hardware and software are required. This article introduces an alternative technique for fabricating a custom zirconia post-and-core with a conventional impression...
March 8, 2018: Journal of Prosthetic Dentistry
Junaid Malik, Jose Rodriguez, Michael Weisbloom, Haralampos Petridis
PURPOSE: To compare the accuracy (ie, precision and trueness) of full-arch impressions fabricated using either a conventional polyvinyl siloxane (PVS) material or one of two intraoral optical scanners. MATERIALS AND METHODS: Full-arch impressions of a reference model were obtained using addition silicone impression material (Aquasil Ultra; Dentsply Caulk) and two optical scanners (Trios, 3Shape, and CEREC Omnicam, Sirona). Surface matching software (Geomagic Control, 3D Systems) was used to superimpose the scans within groups to determine the mean deviations in precision and trueness (μm) between the scans, which were calculated for each group and compared statistically using one-way analysis of variance with post hoc Bonferroni (trueness) and Games-Howell (precision) tests (IBM SPSS ver 24, IBM UK)...
March 2018: International Journal of Prosthodontics
N Hussain, H Jabbar, M Hayati, J Wu, T P Hyde
OBJECTIVES: The 3 objectives are to assess current preferences for impressions for complete dentures, audit practice and compare practice to current UK teaching. METHODS: Three surveys where undertaken; a survey of GDPs preferences, an audit of practice and a survey of teaching in UK dental schools. RESULTS: UK Universities advocate border moulded custom trays. In stated preferences, 99% of practitioners used custom trays for private practice; 67% for NHS work...
March 8, 2018: European Journal of Prosthodontics and Restorative Dentistry
Cong Wang, Xiaochen Ren, Chunhui Xu, Beibei Fu, Ruihao Wang, Xiaotao Zhang, Rongjin Li, Hongxiang Li, Huanli Dong, Yonggang Zhen, Shengbin Lei, Lang Jiang, Wenping Hu
Organic field-effect transistors and near-infrared (NIR) organic phototransistors (OPTs) have attracted world's attention in many fields in the past decades. In general, the sensitivity, distinguishing the signal from noise, is the key parameter to evaluate the performance of NIR OPTs, which is decided by responsivity and dark current. 2D single crystal films of organic semiconductors (2DCOS) are promising functional materials due to their long-range order in spite of only few molecular layers. Herein, for the first time, air-stable 2DCOS of n-type organic semiconductors (a furan-thiophene quinoidal compound, TFT-CN) with strong absorbance around 830 nm, by the facile drop-casting method on the surface of water are successfully prepared...
March 7, 2018: Advanced Materials
Jayishni N Maharaj, Andrew G Cresswell, Glen A Lichtwark
PURPOSE: Foot orthoses maybe used in the management of musculoskeletal disorders related to abnormal subtalar joint (STJ) pronation. However, the precise mechanical benefits of foot orthoses for preventing injuries associated with the STJ are not well understood. The aim of this study was to investigate the immediate effect of foot orthoses on the energy absorption requirements of the STJ and subsequently tibialis posterior (TP) muscle function. METHODS: Eighteen asymptomatic subjects with a pes planus foot posture were prescribed custom-made foot orthoses made from a plaster cast impression...
March 5, 2018: Medicine and Science in Sports and Exercise
Jennifer M Turner, Christine Purslow, Paul J Murphy
OBJECTIVES: To assess the efficacy and effect on clinical signs of a polyvinylsiloxane (Tresident; Shütz Dental Group GmbH, Germany) compared with an irreversible hydrocolloid (Orthoprint; Zhermack SpA, Badia Polesine, Italy) for ocular impression-taking. METHODS: Twenty subjects were recruited (13 female and 7 male), with mean age 31.1±4.6 years (SD) (range 25.8-39.7). Subjects attended for 2 sessions, each of 1-hr duration, on 2 separate days. Each session was scheduled at the same time on each day...
February 28, 2018: Eye & Contact Lens
Fa-Bing Tan, Chao Wang, Hong-Wei Dai, Yu-Bo Fan, Jin-Lin Song
PURPOSE: The study aimed to identify the accuracy and reproducibility of preparations made by gypsum materials of various colors using quantitative and semi-quantitative three-dimensional (3D) approach. MATERIALS AND METHODS: A titanium maxillary first molar preparation was created as reference dataset (REF). Silicone impressions were duplicated from REF and randomized into 6 groups (n=8). Gypsum preparations were formed and grouped according to the color of gypsum materials, and light-scanned to obtain prepared datasets (PRE)...
February 2018: Journal of Advanced Prosthodontics
Alessandro Mangano, Matteo Beretta, Giuseppe Luongo, Carlo Mangano, Francesco Mangano
Objective: The objective of the present study was to compare patients' acceptability, comfort and stress with conventional and digital impressions. Materials and Methods: Thirty young orthodontic patients (15 males and 15 females) who had no previous experience of impressions were enrolled in this study. Conventional impressions for orthodontic study models of the dental arches were taken using an alginate impression material (Hydrogum® , Zhermack Spa, Badia Polesine, Rovigo, Italy)...
2018: Open Dentistry Journal
Fabian Huettig, Usama Chekhani, Andrea Klink, Fadi Said, Frank Rupp
The shark-fin test was modified to convey the clinical application of a single-step/double-mix technique assessing the behavior of two viscosities applied at one point in time. A medium and light body polyether (PE), a medium and light body polyvinylsiloxane (PVS), and a medium as well as heavy and light body vinyl polyether silicone (PVXE) impression material were analyzed solely, and in a layered mixture of 1:1 and 3:1 at working times of 50, 80, and 120 s. The fin heights were measured with a digital ruler...
February 27, 2018: Dental Materials Journal
Lu-Lu Zhang, Ying-Xian Zhou, Tao Li, Di Ma, Xue-Lin Yang
Multi-heteroatom (N, S and F) doped carbon coated Na3 V2 (PO4 )3 (labeled as NVP/C-ILs) derived from an ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM]TF2N) has been successfully fabricated. The as-prepared Na3 V2 (PO4 )3 particles are well dispersed and closely coated with a multi-heteroatom (N, S and F) doped carbon layer. As a cathode for sodium-ion batteries, the NVP/C-ILs electrode exhibits high reversible specific capacity (117.5 mA h g-1 at 1C), superior rate performance (93...
February 28, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
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