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https://www.readbyqxmd.com/read/29211127/evaluation-of-stress-distribution-in-endodontically-weakened-teeth-restored-with-different-crown-materials-3d-fea-analysis
#1
Izabela C M Moris, Carolina Alves Moscardini, Luana Kelle Batista Moura, Yara Teresinha Corrêa Silva-Sousa, Erica Alves Gomes
This study evaluated the stress distribution in endodontically treated teeth, weakened (W) or not weakened (NW), restored with different materials of prosthetic crown using 3D-FEA. Models of a maxillary canine were constructed based on micro-CT images and divided into the groups: G1 (control) - sound tooth; G2 to G7 - endodontically treated teeth restored with glass fiber post (GFP); which G2 to G4 simulated NW root and G5 to G7 simulated W root. For crown material the teeth were restored with: G2 and G5: metallic coping and ceramic veneering, G3 and G6: zirconia coping and ceramic veneering, G4 and G7: alumina coping and ceramic veneering...
November 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29195390/an-embeddable-optical-strain-gauge-based-on-a-buckled-beam
#2
Yang Du, Yizheng Chen, Chen Zhu, Yiyang Zhuang, Jie Huang
We report, for the first time, a low cost, compact, and novel mechanically designed extrinsic Fabry-Perot interferometer (EFPI)-based optical fiber sensor with a strain amplification mechanism for strain measurement. The fundamental design principle includes a buckled beam with a coated gold layer, mounted on two grips. A Fabry-Perot cavity is produced between the buckled beam and the endface of a single mode fiber (SMF). A ceramic ferrule is applied for supporting and orienting the SMF. The principal sensor elements are packaged and protected by two designed metal shells...
November 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29178150/towards-a-kieselguhr-and-pvpp-free-clarification-and-stabilization-process-of-rough-beer-at-room-temperature-conditions
#3
Alessio Cimini, Mauro Moresi
In this work, the main constraint (that is, beer chilling and chill haze removing) of the current beer conditioning techniques using Kieselguhr filtration and Polyvinylpolypyrrolidone (PVPP) treatment was overcome by developing a novel higher-throughput conditioning process, operating at room temperatures with no use of filter aids. The effect of filtration temperature (TF ) in the range of 0 to 40 °C on the hydraulic permeability of ceramic hollow-fiber (HF) membranes with nominal pore size of 0.2 to 1.4 μm, as well as on their limiting permeation flux (J* ) when feeding precentrifuged rough beer, was preliminarily assessed...
November 27, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/29170562/enhanced-durability-of-carbon-nanotube-grafted-hierarchical-ceramic-microfiber-reinforced-epoxy-composites
#4
Ajay Krishnamurthy, Donald L Hunston, Amanda L Forster, Bharath Natarajan, Andrew H Liotta, Sunny S Wicks, Paul E Stutzman, Brian L Wardle, J Alexander Liddle, Aaron M Forster
As carbon nanotube (CNT) infused hybrid composites are increasingly identified as next-generation aerospace materials, it is vital to evaluate their long-term structural performance under aging environments. In this work, the durability of hierarchical, aligned CNT grafted aluminoborosilicate microfiber-epoxy composites (CNT composites) are compared against baseline aluminoborosilicate composites (baseline composites), before and after immersion in water at 25 °C (hydro) and 60 °C (hydrothermal), for extended durations (90 d and 180 d)...
December 2017: Carbon
https://www.readbyqxmd.com/read/29144425/selective-laser-sintering-of-porous-silica-enabled-by-carbon-additive
#5
Shuai Chang, Liqun Li, Li Lu, Jerry Ying Hsi Fuh
The aim of this study is to investigate the possibility of a freeform fabrication of porous ceramic parts through selective laser sintering (SLS). SLS was proposed to manufacture ceramic green parts because this additive manufacturing technique can be used to fabricate three-dimensional objects directly without a mold, and the technique has the capability of generating porous ceramics with controlled porosity. However, ceramic printing has not yet fully achieved its 3D fabrication capabilities without using polymer binder...
November 16, 2017: Materials
https://www.readbyqxmd.com/read/29124996/a-30-year-mortality-and-respiratory-morbidity-study-of-refractory-ceramic-fiber-workers
#6
Grace LeMasters, James E Lockey, Timothy J Hilbert, Linda S Levin, Jeff W Burkle, Ralph Shipley, Charles Perme, Cristopher A Meyer, Carol H Rice
AIM: Report mortality (n = 1119), cancer incidence (n = 1207) and radiographic (n = 1451) findings from a 30-year investigation of current and former refractory ceramic fiber (RCF) workers. METHODS: Cause of death, health and work histories, radiographs and spirometry were collected. Mortality and cancer incidence were analyzed. Logistic regression analysis investigated the associations of latency and cumulative fiber exposure (CFE) on radiographic changes...
August 2017: Inhalation Toxicology
https://www.readbyqxmd.com/read/29104278/use-of-nanoparticles-for-enhancing-the-interlaminar-properties-of-fiber-reinforced-composites-and-adhesively-bonded-joints-a-review
#7
REVIEW
Davide De Cicco, Zohreh Asaee, Farid Taheri
This review paper aims at reporting some of the notable works carried out concerning the use of nanoparticles (NPs) as a means of improving the resistance of fiber-reinforced polymer composite materials (FRPs) and adhesively bonded joints (ABJs) to delamination initiation and propagation. Applications of various nanoparticles, such as carbon-based, ceramic-based and mineral-based are discussed. The main properties that have been considered for improving the delamination and fatigue resistance of FRPs are the interlaminar shear strength, fracture toughness, and fracture energy...
November 1, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29094503/absorbable-mineral-nanocomposite-for-biomedical-applications-influence-of-homogenous-fiber-dispersity-on-mechanical-properties
#8
Elias Mulky, Katharina Maniura-Weber, Martin Frenz, Giuseppino Fortunato, Reto Luginbuehl
Electrospun micro- and nano-sized fibers are frequently used as reinforcing elements in low temperature ceramic composites for biomedical applications. Electrospinning of fibers yield, however, not individual fibers, but rather fiber-mats that are difficult to separate. Most investigations have been performed on diced mats and highly non-homogenous composites. We examined the influence of dispersed electrospun single micro- and nano-meter fibers on the mechanical properties of calcium phosphate cement composites...
November 1, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29092506/an-optical-fiber-bragg-grating-and-piezoelectric-ceramic-voltage-sensor
#9
Qing Yang, Yanxiao He, Shangpeng Sun, Mandan Luo, Rui Han
Voltage measurement is essential in many fields like power grids, telecommunications, metallurgy, railways, and oil production. A voltage-sensing unit, consisting of fiber Bragg gratings (FBGs) and piezoelectric ceramics, based on which an optical over-voltage sensor was proposed and fabricated in this paper. No demodulation devices like spectrometer or Fabry-Perot filter were needed to gain the voltage signal, and a relatively large sensing frequency range was acquired in this paper; thus, the cost of the sensing system is more acceptable in engineering application...
October 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29077074/electrospun-ceramic-nanofiber-mats-today-synthesis-properties-and-applications
#10
REVIEW
Hamid Esfahani, Rajan Jose, Seeram Ramakrishna
Ceramic nanofibers (NFs) have recently been developed for advanced applications due to their unique properties. In this article, we review developments in electrospun ceramic NFs with regard to their fabrication process, properties, and applications. We find that surface activity of electrospun ceramic NFs is improved by post pyrolysis, hydrothermal, and carbothermal processes. Also, when combined with another surface modification methods, electrospun ceramic NFs result in the advancement of properties and widening of the application domains...
October 27, 2017: Materials
https://www.readbyqxmd.com/read/29067737/biomechanical-assessment-of-restored-mandibular-molar-by-endocrown-in-comparison-to-a-glass-fiber-post-retained-conventional-crown-3d-finite-element-analysis
#11
Mohammed Abu Helal, Zhigang Wang
PURPOSE: To compare equivalent and contact stresses in a mandibular molar restored by all-ceramic crowns through two methods: ceramic endocrowns and ceramic crowns supported by fiber-reinforced composite (FRC) posts and core, by using 3D finite element analysis during normal masticatory load. MATERIALS AND METHODS: Three 3D models of a mandibular first molar were made and labeled as such: intact molar with no restoration (A); ceramic endocrown-restored molar (B); ceramic crown supported by FRC posts and core restored molar (C)...
October 25, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29064768/can-peek-be-an-implant-material-evaluation-of-surface-topography-and-wettability-of-filled-versus-unfilled-peek-with-different-surface-roughness
#12
Tarek Ayman El Awadly, Iman Radi, Amr El Khadem, Reham Osman
PEEK (polyetheretherketone) composites are biocompatible materials and may overcome esthetic and allergic problems of titanium dental implants. However, their potential for osseointegration with the subsequent survival rate is still questionable. Aim of the study was to evaluate the sur-face roughness and wettability of different surface treated filled and unfilled PEEK specimens, which may be indicative of the osseointegration behavior and the potential use of PEEK as an implant material. Unfilled, ceramic filled (CFP) and carbon fiber reinforced (CFRP) PEEK discs were prepared and left untreated or were surface treated with 50µ, 110µ, 250µ aluminum oxide particles...
October 24, 2017: Journal of Oral Implantology
https://www.readbyqxmd.com/read/28988143/fatigue-failure-load-of-zirconia-reinforced-lithium-silicate-glass-ceramic-cemented-to-a-dentin-analogue-effect-of-etching-time-and-hydrofluoric-acid-concentration
#13
Jaiane Bandoli Monteiro, Marcelo Gallo Oliani, Luis Felipe Guilardi, Catina Prochnow, Gabriel Kalil Rocha Pereira, Marco Antonio Bottino, Renata Marques de Melo, Luiz Felipe Valandro
This study aimed to evaluate the effect of etching time and hydrofluoric acid (HF) concentration on the fatigue failure load and surface characteristics of zirconia-reinforced lithium silicate glass (ZLS) ceramic cemented to a dentin-like, fiber reinforced epoxy resin. Ceramic (Suprinity, VITA) (1.0mm thick) and epoxy resin (2.5mm thick) discs (10mm diameter) were produced. The bonding surface of the ceramic samples was nonetched (control group), or etched for 30, 60 or 90s by 5% or 10% HF. The epoxy resin discs were etched by 10% HF for 30s followed by the application of an adhesive material (Single Bond Universal, 3M ESPE)...
September 23, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28955597/treatment-approaches-for-traumatized-anterior-teeth-with-excessive-tissue-loss-three-case-reports
#14
Zuhal Yildirim, Omer Yavuz Gomec
Use of direct composite and indirect laminate veneers has been an alternative to metal- and all-ceramic crowns for anterior teeth restorations. Dental traumas are the most common reasons for excessive tissue loss. Treatment options depend on the amount of remaining tissue, the extent of the damage to dental pulp and periapical tissues and the time elapsed before dental treatment. The aim of this case report was to evaluate the direct and indirect techniques used in the treatments of traumatically fractured anterior teeth...
2017: Journal of Istanbul University Faculty of Dentistry
https://www.readbyqxmd.com/read/28951922/molecular-design-of-melt-spinnable-co-polymers-as-si-b-c-n-fiber-precursors
#15
Antoine Viard, Laura Gottardo, David Lopez-Ferber, Anne Soleilhavoup, Chrystelle Salameh, Sneha Samal, Yann Gueguen, Tanguy Rouxel, Günter Motz, Florence Babonneau, Christel Gervais, Samuel Bernard
Two series of co-polymers with the general formula [B(C2H4SiCH3(NH)x(NCH3)y)3]n, i.e., composed of C2H4SiCH3(NH)x and C2H4SiCH3(NCH3)y (C2H4 = CHCH3, CH2CH2) building blocks in a well defined x : y ratio, have been synthesized by hydroboration of dichloromethylvinylsilane with borane dimethyl sulfide followed by successive reactions with lithium amide and methylamine according to controlled ratios. The role of the chemistry behind their syntheses has been studied in detail by solid-state NMR, FT-IR and elemental analyses...
October 10, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28936037/comparison-of-resistance-to-fracture-between-three-types-of-permanent-restorations-subjected-to-shear-force-an-in-vitro-study
#16
Ramin Atash, Maiyas Arab, Hadrien Duterme, Sibel Cetik
INTRODUCTION: Our study's objective was to compare resistance to fracture between endocrown and conventional post and core restorations when subjected to shear force. MATERIALS AND METHODS: Thirty human mandibular premolars were extracted for orthodontic reasons, endodontically treated, and restored using three different methods: endocrown, glass fiber post and composite resin core, and metal post. All the crowns were made from IPS e.max ceramic. Shear forces were applied to these restorations using a test machine until breakage...
July 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28923548/survival-of-extensively-damaged-endodontically-treated-incisors-restored-with-different-types-of-posts-and-core-foundation-restoration-material
#17
Priscilla Cardoso Lazari, Marco Aurélio de Carvalho, Altair A Del Bel Cury, Pascal Magne
STATEMENT OF PROBLEM: Which post-and-core combination will best improve the performance of extensively damaged endodontically treated incisors without a ferrule is still unclear. PURPOSE: The purpose of this in vitro study was to investigate the restoration of extensively damaged endodontically treated incisors without a ferrule using glass-ceramic crowns bonded to various composite resin foundation restorations and 2 types of posts. MATERIAL AND METHODS: Sixty decoronated endodontically treated bovine incisors without a ferrule were divided into 4 groups and restored with various post-and-core foundation restorations...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28891632/design-of-boron-nitride-gelatin-electrospun-nanofibers-for-bone-tissue-engineering
#18
Sakthivel Nagarajan, Habib Belaid, Céline Pochat-Bohatier, Catherine Teyssier, Igor Iatsunskyi, Emerson Coy, Sébastien Balme, David Cornu, Philippe Miele, Narayana S Kalkura, Vincent Cavaillès, Mikhael Bechelany
Gelatin is a biodegradable biopolymer obtained by collagen denaturation, which shows poor mechanical properties. Hence, improving its mechanical properties is very essential toward the fabrication of efficient nontoxic material for biomedical applications. For this aim, various methods are employed using external fillers such as ceramics or bioglass. In this report, we introduce boron nitride (BN)-reinforced gelatin as a new class of two-dimensional biocompatible nanomaterials. The effect of the nanofiller on the mechanical behavior is analyzed...
October 4, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28878162/tribological-properties-of-alsi12-al-8322-o-8323-interpenetrating-composite-layers-in-comparison-with-unreinforced-matrix-alloy
#19
Anna Janina Dolata
Alumina-Aluminum composites with interpenetrating network structures are a new class of advanced materials with potentially better properties than composites reinforced by particles or fibers. Local casting reinforcement was proposed to take into account problems with the machinability of this type of materials and the shaping of the finished products. The centrifugal infiltration process fabricated composite castings in the form of locally reinforced shafts. The main objective of the research presented in this work was to compare the tribological properties (friction coefficient, wear resistance) of AlSi12/Al₂O₃ interpenetrating composite layers with unreinforced AlSi12 matrix areas...
September 6, 2017: Materials
https://www.readbyqxmd.com/read/28876075/structural-evolution-and-formation-mechanism-of-the-soft-colloidal-arrays-in-the-core-of-paam-nanofibers-by-electrospun-packing
#20
Qifeng Mu, Qingsong Zhang, Lu Gao, Zhiyong Chu, Zhongyu Cai, Xiaoyong Zhang, Ke Wang, Yen Wei
Electrospinning provides a facile and versatile method for generating nanofibers from a large variety of starting materials, including polymers, ceramic, composites, and micro-/nanocolloids. In particular, incorporating functional nanoparticles (NPs) with polymeric materials endows the electrospun fibers/sheets with novel or better performance. This work evaluates the spinnability of polyacrylamide (PAAm) solution containing thermoresponsive poly(N-isopropylacrylamide-co-tert-butyl acrylate) microgel nanospheres (PNTs) prepared by colloid electrospinning...
September 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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