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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
#1
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
#2
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
#3
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...
September 21, 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
#4
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
#5
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
https://www.readbyqxmd.com/read/28815162/clinical-application-of-ceramics-in-anterior-cervical-discectomy-and-fusion-a-review-and-update
#6
REVIEW
Shayan Abdollah Zadegan, Aidin Abedi, Seyed Behnam Jazayeri, Hirbod Nasiri Bonaki, Alexander R Vaccaro, Vafa Rahimi-Movaghar
STUDY DESIGN: Narrative review. OBJECTIVES: Anterior cervical discectomy and fusion (ACDF) is a reliable procedure, commonly used for cervical degenerative disc disease. For interbody fusions, autograft was the gold standard for decades; however, limited availability and donor site morbidities have led to a constant search for new materials. Clinically, it has been shown that calcium phosphate ceramics, including hydroxyapatite (HA) and tricalcium phosphate (TCP), are effective as osteoconductive materials and bone grafts...
June 2017: Global Spine Journal
https://www.readbyqxmd.com/read/28799331/flexible-sic-si3n4-composite-nanofibers-with-in-situ-embedded-graphite-for-highly-efficient-electromagnetic-wave-absorption
#7
Peng Wang, Laifei Cheng, Yani Zhang, Litong Zhang
SiC/Si3N4 composite nanofibers with in situ embedded graphite, which show highly efficient electromagnetic (EM) wave absorption performance in gigahertz frequency, were prepared by electrospinning with subsequent polymer pyrolysis and annealing. By means of incorporating graphite and Si3N4 into SiC, the EM wave absorption properties of the nanofibers were improved. The relationship among processing, fiber microstructure, and their superior EM wave absorption performance was systematically investigated. The EM wave absorption capability and effective absorption bandwidth (EAB) of nanofibers can be simply controlled by adjusting annealing atmosphere and temperature...
August 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28773966/comparisons-of-damage-evolution-between-2d-c-sic-and-sic-sic-ceramic-matrix-composites-under-tension-tension-cyclic-fatigue-loading-at-room-and-elevated-temperatures
#8
Longbiao Li
In this paper, comparisons of damage evolution between 2D C/SiC and SiC/SiC ceramic-matrix composites (CMCs) under tension-tension cyclic fatigue loading at room and elevated temperatures have been investigated. Fatigue hysteresis loops models considering multiple matrix cracking modes in 2D CMCs have been developed based on the damage mechanism of fiber sliding relative to the matrix in the interface debonded region. The relationships between the fatigue hysteresis loops, fatigue hysteresis dissipated energy, fatigue peak stress, matrix multiple cracking modes, and interface shear stress have been established...
October 19, 2016: Materials
https://www.readbyqxmd.com/read/28773908/characteristics-of-ceramic-fiber-modified-asphalt-mortar
#9
Jiuming Wan, Shaopeng Wu, Yue Xiao, Quantao Liu, Erik Schlangen
Ceramic fiber, with a major composition of Al₂O₃ and SiO₂, has advantages of stability at relatively high temperature, big specific surface area and resistance to external mechanical vibration. It has the potential contribution of improving the rutting resistance and temperature sensitivity of modified asphalt binder by proper modification design. In this research, ceramic fiber was introduced into both pen 60/80 and pen 80/100 asphalt binder by different weight ratios. An asphalt penetration test, softening point test, ductility test and dynamic viscoelastic behavior were conducted to characterize and predict the ceramic fiber modified asphalt mortar (CFAM)...
September 21, 2016: Materials
https://www.readbyqxmd.com/read/28772723/toughening-mechanisms-in-nanolayered-max-phase-ceramics-a-review
#10
REVIEW
Xinhua Chen, Guoping Bei
Advanced engineering and functional ceramics are sensitive to damage cracks, which delay the wide applications of these materials in various fields. Ceramic composites with enhanced fracture toughness may trigger a paradigm for design and application of the brittle components. This paper reviews the toughening mechanisms for the nanolayered MAX phase ceramics. The main toughening mechanisms for these ternary compounds were controlled by particle toughening, phase-transformation toughening and fiber-reinforced toughening, as well as texture toughening...
March 30, 2017: Materials
https://www.readbyqxmd.com/read/28772544/synergistic-effects-of-stress-rupture-and-cyclic-loading-on-strain-response-of-fiber-reinforced-ceramic-matrix-composites-at-elevated-temperature-in-oxidizing-atmosphere
#11
Longbiao Li
In this paper, the synergistic effects of stress rupture and cyclic loading on the strain response of fiber-reinforced ceramic-matrix composites (CMCs) at elevated temperature in air have been investigated. The stress-strain relationships considering interface wear and interface oxidation in the interface debonded region under stress rupture and cyclic loading have been developed to establish the relationship between the peak strain, the interface debonded length, the interface oxidation length and the interface slip lengths...
February 15, 2017: Materials
https://www.readbyqxmd.com/read/28772389/optically-clear-and-resilient-free-form-%C3%A2%C2%B5-optics-3d-printed-via-ultrafast-laser-lithography
#12
Linas Jonušauskas, Darius Gailevičius, Lina Mikoliūnaitė, Danas Sakalauskas, Simas Šakirzanovas, Saulius Juodkazis, Mangirdas Malinauskas
We introduce optically clear and resilient free-form micro-optical components of pure (non-photosensitized) organic-inorganic SZ2080 material made by femtosecond 3D laser lithography (3DLL). This is advantageous for rapid printing of 3D micro-/nano-optics, including their integration directly onto optical fibers. A systematic study of the fabrication peculiarities and quality of resultant structures is performed. Comparison of microlens resiliency to continuous wave (CW) and femtosecond pulsed exposure is determined...
January 2, 2017: Materials
https://www.readbyqxmd.com/read/28766145/in-vitro-genotoxicity-of-asbestos-substitutes-induced-by-coupled-stimulation-of-dissolved-high-valence-ions-and-oxide-radicals
#13
Tingting Huo, Faqin Dong, Jianjun Deng, Qingbi Zhang, Wei Ye, Wei Zhang, Pingping Wang, Dongping Sun
The wide use of asbestos and its substitutes has given rise to studies on their possible harmful effects on human health and environment. However, their toxic effects remain unclear. The present study was aimed to disclose the coupled effects of dissolved high-valence ions and oxide radicals using the in vitro cytotoxicity and genotoxicity of chrysotile (CA), nano-SiO2 (NS), ceramic fiber (CF), glass fiber (GF), and rock wool (RW) on Chinese hamster lung cells V79. All samples induced cell mortality correlated well with the chemical SiO2 content of asbestos substitutes and the amount of dissolved Si...
August 1, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28756658/polymers-for-3d-printing-and-customized-additive-manufacturing
#14
Samuel Clark Ligon, Robert Liska, Jürgen Stampfl, Matthias Gurr, Rolf Mülhaupt
Additive manufacturing (AM) alias 3D printing translates computer-aided design (CAD) virtual 3D models into physical objects. By digital slicing of CAD, 3D scan, or tomography data, AM builds objects layer by layer without the need for molds or machining. AM enables decentralized fabrication of customized objects on demand by exploiting digital information storage and retrieval via the Internet. The ongoing transition from rapid prototyping to rapid manufacturing prompts new challenges for mechanical engineers and materials scientists alike...
August 9, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28755493/osteoinductive-porous-biphasic-calcium-phosphate-ceramic-as-an-alternative-to-autogenous-bone-grafting-in-the-treatment-of-mandibular-bone-critical-size-defects
#15
Paula Sanches Santos, Tania Mary Cestari, Jéssica Botto Paulin, Renato Martins, Caroline Andrade Rocha, Ricardo Vinícius Nunes Arantes, Bruna Carolina Costa, Cássio Morilla Dos Santos, Gerson Francisco Assis, Rumio Taga
The bone-induction capacity of a porous biphasic calcium phosphate (pBCP) using heterotopic implantation in mouse (mHI-model) and its efficacy as substitute for autograft in mandibular critical-size defect in rabbit (rabMCSD-model) was investigated. In mHI-model, pBCP was implanted into the thigh muscles and bone formation was histomorphometrically and immunohistochemically evaluated. In rabMCSD-model, 13 mm bone defects were treated with pBCP or autograft and bone repair comparatively evaluated by radiographic and histomorphometric methods...
July 29, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28735790/patient-specific-finite-element-analysis-of-fiber-post-and-ferrule-design
#16
Monise de Paula Rodrigues, Priscilla Barbosa Ferreira Soares, Andréa Dollores Correia Miranda Valdivia, Roberto Sales Pessoa, Crisnicaw Veríssimo, Antheunis Versluis, Carlos José Soares
INTRODUCTION: A ferrule on anterior endodontic-treated teeth has been evaluated using clinical trials, in vitro tests, and finite element analysis (FEA). The patient-specific FEA with a nonuniform ferrule and nonlinear contact biting load associated with clinical validation can be used to predict failure. METHODS: A patient was selected with both maxillary central incisors with different ferrule designs who received endodontic treatment and restoration using a fiber post, composite core, and computer aided design and computer aided manufacturing lithium disilicate ceramic crowns...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28731208/super-strong-super-stiff-macrofibers-with-aligned-long-bacterial-cellulose-nanofibers
#17
Sha Wang, Feng Jiang, Xu Xu, Yudi Kuang, Kun Fu, Emily Hitz, Liangbing Hu
With their impressive properties such as remarkable unit tensile strength, modulus, and resistance to heat, flame, and chemical agents that normally degrade conventional macrofibers, high-performance macrofibers are now widely used in various fields including aerospace, biomedical, civil engineering, construction, protective apparel, geotextile, and electronic areas. Those macrofibers with a diameter of tens to hundreds of micrometers are typically derived from polymers, gel spun fibers, modified carbon fibers, carbon-nanotube fibers, ceramic fibers, and synthetic vitreous fibers...
September 2017: Advanced Materials
https://www.readbyqxmd.com/read/28713120/sealing-ability-of-esthetic-post-and-core-systems
#18
Thamer Almohareb
AIM: To review the literature on the sealing ability of esthetic post systems with different cementation techniques. BACKGROUND: An important factor for successful root canal treatment is the development of a coronal seal to the treated root canal system. Review result: The current literature describes promising results using fiber posts with a dual-cure, self-etch resin cement system. However, none of the published results describe a post system or cementation technique that achieved a homogeneous and tight coronal seal...
July 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28680547/fracture-resistances-of-zirconia-cast-ni-cr-and-fiber-glass-composite-posts-under-all-ceramic-crowns-in-endodontically-treated-premolars
#19
Sareh Habibzadeh, Hamid Reza Rajati, Habib Hajmiragha, Shima Esmailzadeh, Mohamadjavad Kharazifard
PURPOSE: The aim of the present study was to evaluate the fracture resistances of zirconia, cast nickel-chromium alloy (Ni-Cr), and fiber-composite post systems under all-ceramic crowns in endodontically treated mandibular first premolars. MATERIALS AND METHODS: A total of 36 extracted human mandibular premolars were selected, subjected to standard endodontic treatment, and divided into three groups (n=12) as follows: cast Ni-Cr post-and-core, one-piece custom-milled zirconia post-and-core, and prefabricated fiber-glass post with composite resin core...
June 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28663858/infrared-radiative-properties-and-thermal-modeling-of-ceramic-embedded-textile-fabrics
#20
David M Anderson, John R Fessler, Matthew A Pooley, Scott Seidel, Michael R Hamblin, Haskell W Beckham, James F Brennan
The infrared optical properties of textiles are of great importance in numerous applications, including infrared therapy and body thermoregulation. Tuning the spectral response of fabrics by the engineering of composite textile materials can produce fabrics targeted for use in these applications. We present spectroscopic data for engineered polyester fabric containing varying amounts of ceramic microparticles within the fiber core and report a spectrally-dependent shift in infrared reflectance, transmittance and absorptance...
March 1, 2017: Biomedical Optics Express
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