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impression material

Lin Ye
The development of clinical implant dentistry was intensively affected by dental implant design improvement and innovation, which brought about new concept, even milestone-like changes of clinical protocol. The current improvements of dental implant design and their clinical importance could be highlighted as followings: 1) The implant apical design influences the implant preliminary stability in immediate implant. The apical 3-5 mm design of implant makes implant stable in immediate implant, because this part would be screwed into alveolar bone through fresh socket, the other part of implant could not be tightly screwed in the socket because of smaller implant diameter...
February 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
Peili Lou, Zhonghui Cui, Zhiqing Jia, Jiyang Sun, Yingbin Tan, Xiangxin Guo
In search of new electrode materials for lithium-ion batteries (LIB), metal phosphides that exhibit desirable properties such as high theoretical capacity, moderate discharge plateau and relative low polarization recently attract a great deal of attention as anode materials. However, the large volume changes and thus resulted collapse of electrode structure during long-term cycling are still the challenges for metal phosphide-based anodes. Here we report an electrode design strategy to solve these problems...
March 21, 2017: ACS Nano
Negin Ghasemi, Maryam Janani, Tahmineh Razi, Faezeh Atharmoghaddam
BACKGROUND: It is necessary apical plug material to exhibit proper adaptation with the root canal walls. Presence of voids at the interface between the root canal wall and this material result in micro leakage, which might have a relationship with post treatment disease. The aim of the present study was to evaluate the effect of different mixing (manual and ultrasonic) and placement (manual and manual in association with indirect ultrasonic) method of Mineral Trioxide Aggregate (MTA) on the void count and dimension in the apical plug in natural teeth with simulated open apices...
March 2017: Journal of Clinical and Experimental Dentistry
Yanyi Zhao, Wenwu Li, Xiangfen Jiang, Fengqiong Li, Xin Li, Wei Zhang, Ji-Sen Jiang, Jian Liu, Katsuhiko Ariga, Ming Hu
Despite a continuously growing interest in the integration of coordination polymer (CP) colloids toward functional materials, collective properties of the CP colloids have rarely been addressed mainly due to the difficulty in assembling pure CP colloids into superstructures with impressive mechanical strength. We demonstrated that CP nanoplates could stack together spontaneously upon drying the slurry of the nanoplates. The stacked CP nanoplates could work like polymeric adhesives. Versatile articles could be glued when the CP nanoplates were sandwiched between two substrates...
March 20, 2017: ACS Nano
Jannelle M Vienneau-Hathaway, Elizabeth R Brassfield, Amanda Kelly Lane, Matthew A Collin, Sandra M Correa-Garhwal, Thomas H Clarke, Evelyn E Schwager, Jessica E Garb, Cheryl Y Hayashi, Nadia A Ayoub
BACKGROUND: Orb-web weaving spiders and their relatives use multiple types of task-specific silks. The majority of spider silk studies have focused on the ultra-tough dragline silk synthesized in major ampullate glands, but other silk types have impressive material properties. For instance, minor ampullate silks of orb-web weaving spiders are as tough as draglines, due to their higher extensibility despite lower strength. Differences in material properties between silk types result from differences in their component proteins, particularly members of the spidroin (spider fibroin) gene family...
March 14, 2017: BMC Evolutionary Biology
Xiaoli Zheng, Haining Chen, Qiang Li, Yinglong Yang, Zhanhua Wei, Yang Bai, Yongcai Qiu, Dan Zhou, Kam Sing Wong, Shihe Yang
Compared with the conventional perovskite solar cells (PSCs) containing hole-transport materials (HTM), carbon materials based HTM-free PSCs (C-PSCs) have often suffered from inferior power conversion efficiencies (PCEs) arising at least partially from the inefficient hole extraction at perovskite/carbon interface. Here, we show that boron (B) doping of multi-walled carbon nanotubes (B-MWNTs) electrodes are superior in enabling enhanced hole extraction and transport by increasing work function, carrier concentration and conductivity of MWNTs...
March 13, 2017: Nano Letters
Wenpei Kang, Yu Zhang, Lili Fan, Liangliang Zhang, Fangna Dai, Rongming Wang, Daofeng Sun
Metal-organic frameworks (MOFs) derived transition metal oxides exhibit enhanced performance in energy conversion and storage. In this work, porous hollow Co3O4 with N-doped carbon coating (Co3O4/N-C) polyhedrons have been prepared using cobalt-based MOFs as a sacrificial template. Assembled from tiny nanoparticles and N-doped carbon coating, Co3O4/N-C composite shortens the diffusion length of Li(+)/Na(+) ions and possesses an enhanced conductivity. And the porous and hollow structure is also beneficial for tolerating volume changes in the galvanostatic discharge/charge cycles as lithium/sodium battery anode materials...
March 17, 2017: ACS Applied Materials & Interfaces
Takahiro Kawabe, Rok Kogovšek
Human observers easily recognize complex natural phenomena, such as flowing water, which often generate highly chaotic dynamic arrays of light on the retina. It has not been clarified how the visual system discerns the source of a fluid flow. Here we show that the magnitude of image deformation caused by light refraction is a critical factor for the visual system to determine the perceptual category of fluid flows. Employing a physics engine, we created computer-rendered scenes of water and hot air flows. For each flow, we manipulated the rendering parameters (distortion factors and the index of refraction) that strongly influence the magnitude of image deformation...
March 9, 2017: Scientific Reports
Nor Aidaniza Abdul Muttlib, Aimi Najwa Pahrol Azman, Yee Tong Seng, Rabihah Alawi, Zaihan Ariffin
BACKGROUND: The purpose of this study was to compare the adaptation of fiber reinforced composite post system and cast post-and-core. METHODS: 17 extracted human permanent maxillary central incisors were endodontically treated following the standard protocol. 17 fiber reinforced composite post had been fabricated and adapted to the prepared parallel root canals. A light body poly vinyl siloxane (EXAMIX NDS, Japan) impression material was inserted into the root canals followed by the post...
December 2016: Acta Stomatologica Croatica
Swathi Sudhapalli
Gingival displacement procedure is an important component of fixed prosthodontics. It helps in delivery of the impression material subgingivally to record the finish line as well as the tooth contour apical to it, so as to produce restorations with closely adapted margins in harmony with the tooth anatomy and gingiva. While displacing gingiva with retraction cords, the health of the tissues must be maintained. In case of multiple anterior tooth preparations with close root proximity, placing the retraction cord simultaneously around all teeth will result in strangulation of interdental papillae...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
Priya L Vaswani, Pronob K Sanyal, Siddharth Y Gosavi, Abhijeet R Kore
INTRODUCTION: Limited published information is available about the influence of preparatory designs and die materials on marginal accuracy of porcelain fused to metal copings using recently developed die materials. AIM: To detect the influence of margin geometries and dimensional accuracy of contemporary die materials on vertical marginal gaps in Porcelain fused to metal coping using a Stereomicroscope (three dimensional analysis). MATERIALS AND METHOD: Two chrome cobalt alloy models of mandibular first molars prepared to have shoulder and deep chamfer finish lines were CAD-CAM milled...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
Mahmoud E Elbashti, Mariko Hattori, Sebastian Bm Patzelt, Dirk Schulze, Yuka I Sumita, Hisashi Taniguchi
PURPOSE: The aim of this study was to evaluate the feasibility and accuracy of using an intraoral scanner to digitize edentulous maxillectomy defects. MATERIALS AND METHODS: A total of 20 maxillectomy models with two defect types were digitized using cone beam computed tomography. Conventional and digital impressions were made using silicone impression material and a laboratory optical scanner as well as a chairside intraoral scanner. The 3D datasets were analyzed using 3D evaluation software...
March 2017: International Journal of Prosthodontics
Cuiqing Wu, Qi Liu, Rongrong Chen, Jingyuan Liu, Hongsen Zhang, Rumin Li, Kazunobu Takahashi, Peili Liu, Jun Wang
Superhydrophobic coatings are highly promising for protecting material surfaces and for wide applications. In this study, superhydrophobic composites, comprising a rhombic-dodecahedral zeolitic imidazolate framework (ZIF-8@SiO2), have been manufactured onto AZ31 magnesium alloy via chemical etching and dip-coating methods to enhance stability and corrosion resistance. Herein, we report on a simple strategy to modify hydrophobic hexadecyltrimethoxysilan (HDTMS) on ZIF-8@SiO2 to significantly improve the property of repelling water...
March 14, 2017: ACS Applied Materials & Interfaces
Wei Liu, Tengfei Zhou, Yang Zheng, Jianwen Liu, Chuanqi Feng, Yue Shen, Yunhui Huang, Zaiping Guo
Zinc germinate (Zn2GeO4) with a hierarchical structure was successfully synthesized in a binary ethylenediamine/water (En/H2O) solvent system by wet chemistry methods. The morphological evolution process of the Zn2GeO4 was investigated in detail by tuning the ratio of En to H2O in different solvent systems, and a series of compounds with awl-shaped, fascicular, and cross-linked hierarchical structures was obtained and employed as anode materials in lithium-ion batteries. The materials with fascicular structure exhibited excellent electrochemical performance, and a specific reversible capacity of 1034 mA h g(-1) was retained at a current density of 0...
March 22, 2017: ACS Applied Materials & Interfaces
Suzy J Campbell, J Russell Stothard, Faye O'Halloran, Deborah Sankey, Timothy Durant, Dieudonné Eloundou Ombede, Gwladys Djomkam Chuinteu, Bonnie L Webster, Lucas Cunningham, E James LaCourse, Louis-Albert Tchuem-Tchuenté
BACKGROUND: The crater lakes of Barombi Mbo and Barombi Kotto are well-known transmission foci of schistosomiasis and soil-transmitted helminthiasis having had several important control initiatives previously. To collect contemporary epidemiological information, a cross-sectional survey was undertaken inclusive of: signs and symptoms of disease, individual treatment histories, local water, sanitation and hygiene (WASH)-related factors and malacological surveillance, with molecular characterisation of specimens...
February 27, 2017: Infectious Diseases of Poverty
Nawapat Sakornwimon, Chalermpol Leevailoj
STATEMENT OF PROBLEM: The use of digital intraoral scanners is increasing; however, evidence of its precision in making crown impressions clinically remains scarce. Patients should also feel more comfortable with digital impressions, but only a few studies evaluating this subject have been performed. PURPOSE: The purpose of this clinical study was to evaluate the marginal fit of monolithic zirconia crowns and patients' preferences for digital impressions versus polyvinyl siloxane (PVS) impressions...
February 17, 2017: Journal of Prosthetic Dentistry
Qi Sun, Briana Aguila, Jason Perman, Lyndsey D Earl, Carter W Abney, Yuchuan Cheng, Hao Wei, Nicholas Nguyen, Lukasz Wojtas, Shengqian Ma
A key challenge in environmental remediation is the design of adsorbents bearing an abundance of accessible chelating sites with high affinity, to achieve both rapid uptake and high capacity for the contaminants. Herein, we demonstrate how two-dimensional covalent organic frameworks (COFs) with well-defined mesopore structures display the right combination of properties to serve as a scaffold for decorating coordination sites to create ideal adsorbents. The proof-of-concept design is illustrated by modifying sulfur derivatives on a newly designed vinyl-functionalized mesoporous COF (COF-V) via thiol-ene "click" reaction...
February 22, 2017: Journal of the American Chemical Society
Mehrdad Zeinalian, Mehdi Eshaghi, Mahdi Hadian, Homayoun Naji, Sayed Mohammad Masoud Marandi, Sedigheh Asgary
Eight essential foods (EEF) described in Iranian traditional medicine (ITM) have a determinant role to balance human temperament insuring health and well-being. EEF included oral, imaginary, auditory, visual, olfactory, touch, sexual, and familiarity food. Oral foods should be halal, compatible with individual temper, consumed up twice a day, and compatible with different seasons and geographic conditions. Imaginary food consists of the individual thought content which is directly related to mental and physical fitness...
2017: International Journal of Preventive Medicine
Hamidreza Rajati Haghi, Masoud Shiehzadeh, Mohammadreza Nakhaei, Fatemeh Ahrary, Saeid Sabzevari
INTRODUCTION: A dental impression is a negative imprint of an oral structure that can be used to produce a positive cast of a patient's teeth as a permanent record. The accuracy of the impression affects the accuracy of the cast, and a precise impression is needed in order to create prosthesis with optimal fitting. Minimization of misfit is an important aim in prosthesis science and dental implants. The aim of this study was to evaluate the effects of the materials and techniques used to take an impression on the vertical misfit of implant-supported, screw-retained, three-unit bridges...
January 2017: Journal of Indian Prosthodontic Society
Ignacio Escapa, Andrew Leslie
PREMISE OF THE STUDY: Plants preserved in different fossil modes provide complementary data concerning the paleobiology and evolutionary relationships among plant groups. New material from the Early Jurassic of Patagonia shows the importance of combining these sources of information, as we describe the first compression/impression fossils of Pararaucaria, a genus of the extinct conifer family Cheirolepidiaceae previously known from permineralized fossils. These fossils extend the temporal range of this genus and may allow its wider recognition in the fossil record...
February 17, 2017: American Journal of Botany
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