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https://www.readbyqxmd.com/read/28651119/experimental-ultrasonic-characterization-of-polyester-based-materials-for-cultural-heritage-applications
#1
Andres Arciniegas, Loic Martinez, Arnaud Briand, Sophie Prieto, Stéphane Serfaty, Nicolas Wilkie-Chancellier
For several years, the Réunion des musées nationaux - Grand-Palais has produced polyester resin reproductions in order to replace marble sculptures that have weakened by outdoor exposure. These objects are made of a complex multilayered polyester composite material including reinforcements to ensure the mechanical strength of the final structure and mineral fillers that allow to imitate the original aesthetics. However, the final structure also weakens because of constant outdoor exposure and ageing. This observation leads today to conduct research related to the structural health monitoring of reproductions for preventive conservation of cultural heritage...
June 17, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28650791/deproteinizing-agents-as-an-effective-enamel-bond-enhancer-an-in-vitro-study
#2
Pallavi Hasija, Vinod Sachdev, Shivani Mathur, Rishi Rath
OBJECTIVE: The aim of this study was to compare the effect of different deproteinizing agents on shear bond strength of composite to primary teeth enamel. STUDY DESIGN: Forty sound primary molars divided in 4 groups of 10 teeth each. In control group 1, enamel was etched for 60 seconds with 37% phosphoric acid and rinsed with water. Group 2: after acid etching deproteinizing agent 5 % sodium hypochlorite was applied for 60 seconds and rinsed. Group 3: after acid etching deproteinizing agent papain gel was applied for 60 seconds and rinsed...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28649971/tailoring-the-nickel-nanoparticles-anchored-on-the-surface-of-fe3o4-sio2-spheres-for-nanocatalysis
#3
Lei Ding, Min Zhang, Yanwei Zhang, Jinbo Yang, Jing Zheng, Tasawar Hayat, Njud S Alharbi, Jingli Xu
Herein, we report an efficient and universal strategy to synthesize a unique triple-shell structured Fe3O4@SiO2@C-Ni hybrid composites. Firstly, the Fe3O4 cores were synthesized by hydrothermal reaction, sequentially coated by SiO2 and a thin layer of nickel ion doped resins-formaldehyde (RF-Ni2+) with an extended stöber method. This was followed by a carbonization to produce the Fe3O4@SiO2@C-Ni nanocomposites with metallic nickel nanoparticles embedded in RF-derived thin graphic carbon layer. Interestingly, the thin SiO2 spacer layer between RF-Ni2+ and Fe3O4 plays a critical role on adjusting the size and density of nickel nanoparticles on the surface of Fe3O4@SiO2 nanospheres...
June 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28647864/bonding-of-composite-resins-to-peek-the-influence-of-adhesive-systems-and-air-abrasion-parameters
#4
Bogna Stawarczyk, Simon Taufall, Malgorzata Roos, Patrick R Schmidlin, Nina Lümkemann
OBJECTIVE: The objective of the study was to investigate the tensile bond strength (TBS) to polyaryletheretherketone (PEEK) after different pretreatment and conditioning methods. METHODS: Four hundred PEEK specimens were fabricated and allocated to the following air-abrasion methods (n 1 = 80/pretreatment): (i) 50 μm Al2O3 (0.05 MPa); (ii) 50 μm Al2O3 (0.35 MPa); (iii) 110 μm Al2O3 (0.05 MPa); (iv) 110 μm Al2O3 (0.35 MPa); and (v) Rocatec 110 μm (0...
June 24, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28646683/fabrication-of-low-fire-hazard-flexible-poly-vinyl-chloride-via-reutilization-of-heavy-metal-biosorbents
#5
Ye-Tang Pan, De-Yi Wang
As a naturally abundant biopolymer, chitosan is considered to be a suitable adsorbent for stannate (SnO3(2-)) in tin plating wastewater. However, mass transfer of the adsorbent and its recycling remain challenging problems. Though flexible poly(vinyl chloride) (PVC) is highly flammable due to the addition of plasticizers, the traditional flame retardant, antimony trioxide (Sb2O3), is potentially harmful. In this study, chitosan was anchored onto the surface of PVC resin to adsorb SnO3(2-) from wastewater. Thereafter, tin-doped chitosan-coated PVC resin was readily recycled and processed into a flexible PVC composite (modified fPVC)...
June 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28645637/antimicrobial-and-biological-activity-of-leachate-from-light-curable-pulp-capping-materials
#6
Maria Teresa Arias-Moliz, Cher Farrugia, Christie Y K Lung, Pierre Schembri Wismayer, Josette Camilleri
OBJECTIVES: Characterization of a number of pulp capping materials and assessment of the leachate for elemental composition, antimicrobial activity and cell proliferation and expression. METHODOLOGY: Three experimental light curable pulp-capping materials, Theracal and Biodentine were characterized by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The elemental composition of the leachate formed after 24hours was assessed by inductively coupled plasma (ICP)...
June 20, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28642930/a-novel-etching-technique-for-surface-treatment-of-zirconia-ceramics-to-improve-adhesion-of-resin-based-luting-cements
#7
Eystein Ivar Ruyter, Nalini Vajeeston, Torbjørn Knarvang, Ketil Kvam
Objectives: Bonding of zirconia crowns and bridges to abutments is important, not only bonding of the thin resin layer to the abutment, but also bonding to the zirconia ceramic is crucial. Both mechanical and chemical adhesion are desired. Mechanical retention of dental porcelain achieved by etching with moderately concentrated hydrofluoric acid is not possible with zirconia ceramics. The purpose of this study was to show that etching is possible with relative low melting fluoride compounds such as ammonium hydrogen difluoride and potassium hydrogen difluoride...
January 2017: Acta Biomaterialia Odontologica Scandinavica
https://www.readbyqxmd.com/read/28642926/the-combined-effect-of-food-simulating-solutions-brushing-and-staining-on-color-stability-of-composite-resins
#8
Tânia Mara Da Silva, Ana Luísa Leme Simões Sales, Cesar Rogerio Pucci, Alessandra Bühler Borges, Carlos Rocha Gomes Torres
Objective: This study evaluated the effect of food-simulating media associated with brushing and coffee staining on color stability of different composite resins. Materials and methods: Eighty specimens were prepared for each composite: Grandio SO (Voco), Amaris (Voco), Filtek Z350XT (3M/ESPE), Filtek P90 (3M/ESPE). They were divided into four groups according to food-simulating media for 7 days: artificial saliva (control), heptane, citric acid and ethanol. The composite surface was submitted to 10,950 brushing cycles (200 g load) in an automatic toothbrushing machine...
January 2017: Acta Biomaterialia Odontologica Scandinavica
https://www.readbyqxmd.com/read/28642922/universal-cements-dual-activated-and-chemically-activated
#9
Eliane de Lima, Ricardo Santos, Márcia Durão, Armiliana Nascimento, Rodivan Braz
Objective: The aim of the present study was to assess the bond strength of universal cements cured either dually or chemically only. Methods: Three cements were assessed using different types of application: dual activated (DA) or chemically activated (CA). In total 80 dentin blocks were used, obtained through the enamel wear of the lingual and buccal surfaces of bovine incisors. Standard cone-shaped cavity preparations were created using diamond burs. Subsequently, indirect restoration blocks were designed with Filtek Z350 (3M ESPE) composite resin...
December 2016: Acta Biomaterialia Odontologica Scandinavica
https://www.readbyqxmd.com/read/28642920/elastic-viscoelastic-and-viscoplastic-contributions-to-compliance-during-deformation-under-stress-in-prosthodontic-temporization-materials
#10
Tritala K Vaidyanathan, Jayalakshmi Vaidyanathan, David Arghavani
Purpose: The goal of this investigation was to characterize the compliance properties in selected polymers used for temporary (provisional crown and bridge) applications. Method: Polymethyl methacrylate (PMMA)- and polyethyl methacrylate (PEMA)-based JET and TRIM II were investigated along with two bisacryl composite resins (LUXATEMP and PROTEMP 3 GARANT). Rectangular samples of the resins were subjected to creep-recovery tests in a dynamic mechanical analyzer at and near the oral temperature (27 °C, 37 °C and 47 °C)...
December 2016: Acta Biomaterialia Odontologica Scandinavica
https://www.readbyqxmd.com/read/28642918/color-stability-of-esthetic-restorative-materials-a-spectrophotometric-analysis
#11
Claudio Poggio, Matteo Ceci, Riccardo Beltrami, Maria Mirando, Jaffal Wassim, Marco Colombo
Objective: The aim of this in vitro study was to evaluate the color stability of different restorative materials (one microfilled composite, one nanofilled composite, one nanohybrid composite and one Ormocer-based composite) after exposure to different staining solutions (coffee, coca-cola and red wine). Material and methods: All materials were polymerized into silicon rings (2 mm ×6 mm ×8 mm) to obtain specimens identical in size. Thirty cylindrical specimens of each material were prepared. They were immersed in staining solutions over a 28-day test period...
December 2016: Acta Biomaterialia Odontologica Scandinavica
https://www.readbyqxmd.com/read/28642912/influence-of-10-sodium-ascorbate-gel-application-time-on-composite-bond-strength-to-bleached-enamel
#12
Cintia Gaio Murad, Suellen Nunes de Andrade, Lucio Ramos Disconzi, Eliseu Aldrighi Munchow, Evandro Piva, Renata Correa Pascotto, Sandra Kiss Moura
Objective To analyze bond strength to bleached enamel following application of 10% sodium ascorbate gel. Material and methods Forty third molars were allocated into five groups (n = 8): GP - unbleached specimens restored with composite resin; GN - specimens restored immediately after bleaching; and G15; G30 and G60 (test groups) - bleached specimens treated with 10% sodium ascorbate gel for 15, 30 and 60 min before restoration. The teeth were sectioned and the buccal and lingual faces were restored. After storage in distilled water (37 °C/24 h), sticks of ±0...
December 2016: Acta Biomaterialia Odontologica Scandinavica
https://www.readbyqxmd.com/read/28642907/flexural-strengths-of-reinforced-denture-base-resins-subjected-to-long-term-water-immersion
#13
Kaneyoshi Yoshida, Yutaka Takahashi, Hirono Sasaki, Ippei Hamanaka, Tomohiro Kawaguchi
Objective This study evaluated the flexural strengths of reinforced denture base resins subjected to long-term water immersion. Materials and methods Acrylic denture base resin reinforced with metal wire or glass fiber-reinforced composite (FRC), and without reinforcement were tested. Bar-shaped specimens were fabricated. Half of the specimens were stored in 37 °C distilled water for 50 hours (h), the other half were stored in 37 °C distilled water for 180 days (d) before testing. Ten specimens were fabricated per group for each reinforcement/water immersion period combination...
December 2016: Acta Biomaterialia Odontologica Scandinavica
https://www.readbyqxmd.com/read/28642558/no-differences-in-longevity-of-direct-and-indirect-composite-restorations
#14
Marie A Congiusta
Data sourcesMedline, Cochrane Library, Web of Science, Scopus, Latin American and Caribbean Health Sciences (LILACS), Brazilian Library of Dentistry (BBO), clinicaltrials.gov and SIGLE databases.Study selectionOnly randomised clinical trials were considered that compared direct vs indirect composite restorations, with or without cusp involvement, having a follow-up period of two years or greater.Data extraction and synthesisTwo reviewers selected studies for inclusion, abstracted data and assessed risk of bias...
June 23, 2017: Evidence-based Dentistry
https://www.readbyqxmd.com/read/28639404/mechanoresponsiveness-of-human-adipose-stem-cells-on-nanocomposite-and-micro-hybrid-composite
#15
Fransisca A S van Esterik, Samaneh Ghazanfari, Behrouz Zandieh-Doulabi, Cornelis M Semeins, Cornelis J Kleverlaan, Jenneke Klein-Nulend
Resin-based composites are used for bone repair applications and comprise resin matrix and different sized filler particles. Nanometer-sized filler particles improve composite's mechanical properties compared to micrometer-sized filler particles, but whether differences exist in the biological response to these composites is unknown. Natural bone comprises a nanocomposite structure, and nanoscale interactions with extracellular matrix components influence stem cell differentiation. Therefore we hypothesized that nanometer-sized filler particles in resin-based composites enhance osteogenic differentiation of stem cells showing a more bone cell-like response to mechanical loading compared to micrometer-sized filler particles...
June 22, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28638554/effect-of-professional-dental-prophylaxis-on-the-surface-gloss-and-roughness-of-cad-cam-restorative-materials
#16
Toshiko Sugiyama, Atsushi Kameyama, Tomoka Enokuchi, Akiko Haruyama, Aoi Chiba, Setsuko Sugiyama, Makoto Hosaka, Toshiyuki Takahashi
BACKGROUND: This study aimed to evaluate the effect of dental prophylaxis on the surface gloss and roughness of different indirect restorative materials for computer-aided design/computer-aided manufacturing (CAD/CAM): two types of CAD/CAM composite resin blocks (Shofu Block HC and Estelite Block) and two types of CAD/CAM ceramic blocks (IPS Empress CAD and Celtra DUO). MATERIAL AND METHODS: After polishing the CAD/CAM blocks and applying prophylaxis pastes, professional dental prophylaxis was performed using four different experimental protocols (n = 5 each): mechanical cleaning with Merssage Regular for 10 s four times (Group 1); four cycles of mechanical cleaning with Merssage Regular for 10 s and Merssage Fine for 10 s (Group 2); four cycles of mechanical cleaning with Merssage Regular for 10 s and Merssage Fine for 30 s (Group 3); and mechanical cleaning with Merssage Fine for 10 s four times (Group 4)...
June 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28638550/shear-bond-strength-of-orthodontic-metal-brackets-to-aged-composite-using-three-primers
#17
Ali Tayebi, Farnoosh Fallahzadeh, Marzieh Morsaghian
BACKGROUND: This study aimed to assess the effect of surface preparation with sandblasting and diamond bur along with the use of three primers on shear bond strength (SBS) of metal brackets to aged composite. MATERIAL AND METHODS: In this in vitro, experimental study, 60 Filtek Z250 composite discs were fabricated (10×2mm), immersed in distilled water for 24 hours and subjected to 5000 thermal cycles. They were randomly divided into two groups (n=30) of sandblasting with aluminum oxide particles for 10 seconds and surface roughening with bur...
June 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28637350/structural-peculiarities-of-ion-conductive-organic-inorganic-polymer-composites-based-on-aliphatic-epoxy-resin-and-salt-of-lithium-perchlorate
#18
Liubov Matkovska, Maksym Iurzhenko, Yevgen Mamunya, Igor Tkachenko, Valeriy Demchenko, Volodymyr Synyuk, Andriy Shadrin, Gisele Boiteux
The article is concerned with hybrid amorphous polymers synthesized basing on epoxy oligomer of diglycide aliphatic ester of polyethylene glycol that was cured by polyethylene polyamine and lithium perchlorate salt. Structural peculiarities of organic-inorganic polymer composites were studied by differential scanning calorimetry, wide-angle X-ray spectra, infrared spectroscopic, scanning electron microscopy, elemental analysis, and transmission and reflective optical microscopy. On the one hand, the results showed that the introduction of LiClO4 salt into epoxy polymer leads to formation of the coordinative metal-polymer complexes of donor-acceptor type between central Li(+) ion and ligand...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28629032/effects-of-silane-modified-fillers-on-properties-of-dental-composite-resin
#19
Aysu Aydınoğlu, Afife Binnaz Hazar Yoruç
The effect of silanization on the mechanical, chemical, and physical properties of dental composites was investigated. Silica fillers were obtained from colloidal silica solution, Ludox® HS-40 and they were silanized by using 3-methacryloxypropyl trimethoxysilane (MPTMS) in an acidic media. Mineralogical and chemical structures of unsilanized and silanized fillers were determined by using XRD and FT-IR analyses. The modification of unsilanized/silanized fillers were investigated by performing XPS and TGA analyses...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628735/effect-of-shade-opacity-and-layer-thickness-on-light-transmission-through-a-nano-hybrid-dental-composite-during-curing
#20
Hong-Keun Hyun, Carly K Christoferson, Carmem S Pfeifer, Chris Felix, Jack L Ferracane
OBJECTIVE: The aim of this study was to investigate the effect of shade and opacity on the change in light transmission through different thicknesses of a nano-hybrid composite during curing. MATERIALS AND METHODS: Twelve different shades of Venus Diamond (Heraeus Kulzer) were placed in disk shaped molds with thickness of 1, 2, and 3 mm (n = 3 per group) and cured with an LED light-curing unit. Initial, final and average irradiance, and the total amount of energy passing through the specimen were measured using the MARC Resin Calibrator at every 10s for a total of 40s...
June 19, 2017: Journal of Esthetic and Restorative Dentistry
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