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Cement film thickness

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https://www.readbyqxmd.com/read/29286620/highly-conductive-and-transparent-reduced-graphene-oxide-nanoscale-films-via-thermal-conversion-of-polymer-encapsulated-graphene-oxide-sheets
#1
Mykhailo Savchak, Nikolay Borodinov, Ruslan Burtovyy, Mark Anayee, Kesong Hu, Ruilong Ma, Anise M Grant, Hongmei Li, Daniel Cutshall, Yi-Mei Wen, Goutam Koley, William R Harrell, George Chumanov, Vladimir V Tsukruk, Igor Luzinov
Despite noteworthy progress in the fabrication of large-area graphene sheet-like nanomaterials, the vapor-based processing still requires sophisticated equipment and a multistage handling of the material. An alternative approach to manufacturing functional graphene-based films includes the employment of graphene oxide (GO) micron-scale sheets as precursors. However, search for a scalable manufacturing technique for the production of high-quality GO nanoscale films with high uniformity and high electrical conductivity is still continuing...
December 29, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29251450/correspondence-between-fiber-post-and-drill-dimensions-for-post-canal-preparation
#2
Ricardo Pablo Portigliatti, José Luis Tumini, Alejandro Daniel Bertoldi Hepburn, Romina Flavia Aromando, Jorge Lorenzo Olmos
PURPOSE: To compare fiber posts of several calibers and trademarks to their corresponding root canal preparation drills. METHODS: Three widely used endodontic post brands and their drills were evaluated: Exacto, ParaPost Taper Lux, and Macro-Lock Illusion X-RO. Fiber posts and drills were microphotographed with a scanning electron microscope and images were analyzed using ImageJ image processing software. Fiber post diameter on apical extreme (Pd0), fiber post diameter at 5 mm from the apical extreme (Pd5), drill diameter on apical extreme (Dd0) and drill diameter at 5 mm from the apical extreme (Dd5) were analyzed...
December 2017: American Journal of Dentistry
https://www.readbyqxmd.com/read/29208791/effect-of-temperature-on-film-thickness-of-two-types-of-commonly-used-luting-cements
#3
M Praveen Kumar, Reddy Priyadarshini, Yasangi M Kumar, K Shanthi Priya, Chunchuvyshnavi Chunchuvyshnavi, Harika Yerrapragada
AIM: The aim of this study is to evaluate the effect of temperature change on film thickness of both types of cements. MATERIALS AND METHODS: Totally, 60 samples were prepared with 10 in each subgroup, thus comprising 30 in each group. Materials tested were glass ionomer cement (GIC) type I and zinc phosphate type I. Samples were manipulated with manufacturer's instructions and tested according to American Dental Association (ADA) guidelines. RESULTS: The mean values of film thickness were recorded for both groups I and II...
December 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29178707/effect-of-cad-cam-glass-fiber-post-core-on-cement-micromorphology-and-fracture-resistance-of-endodontically-treated-roots
#4
Rogério Goulart da Costa, Andrea Freire, Eduardo Christiano Caregnatto de Morais, Evelise Machado de Souza, Giselle Maria Correr, Rodrigo Nunez Rached
PURPOSE: To investigate the fracture resistance of weakened roots restored with prefabricated or CAD/CAM-customized posts and cores as well as the thickness of the cement film and the presence of voids in the cement. METHODS: The roots of 40 human premolars were weakened by removing internal dentin with a diamond bur (2.5 mm in the coronal third and 1.5 mm in the apical third) and restored with prefabricated posts (PPs) or customized posts (CPs) with or without a zirconia crown (n= 10)...
February 2017: American Journal of Dentistry
https://www.readbyqxmd.com/read/29178699/differences-in-physical-characteristics-and-sealing-ability-of-three-tricalcium-silicate-based-cements-used-as-root-end-filling-materials
#5
Maximilian Kollmuss, Carolina Elisabeth Preis, Stefan Kist, Reinhard Hickel, Karin Christine Huth
PURPOSE: To evaluate differences in physical characteristics and sealing ability of root-end-fillings made with these materials compared to the gold standard (ProRoot MTA). METHODS: The physical characteristics of ProRoot MTA, Medcem MTA and Biodentine were evaluated regarding setting time, flow, film thickness, solubility and radiopacity according to the German Institute for Standardization (EN-ISO 6878). To investigate their sealing ability as root-end-fillings, a glucose penetration model was used...
August 2017: American Journal of Dentistry
https://www.readbyqxmd.com/read/29169661/light-irradiance-through-novel-cad-cam-block-materials-and-degree-of-conversion-of-composite-cements
#6
Diogo Pedrollo Lise, Annelies Van Ende, Jan De Munck, Kumiko Yoshihara, Noriyuki Nagaoka, Luiz Clovis Cardoso Vieira, Bart Van Meerbeek
OBJECTIVE: To assess light irradiance (LI) delivered by two light-curing units (LCU's) and to measure the degree of conversion (DC) of three composite cements, when cured through different thicknesses of two novel CAD-CAM block materials. METHODS: 100-μm-thick films of a dual-curable composite cement (G-CEM LinkAce, GC), a light-curable flowable resin-based composite (RBC) (G-ænial Universal Flo, GC) and a micro-hybrid RBC (G-ænial Posterior, GC) were investigated as luting agents...
November 20, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29107135/influence-of-the-addition-of-microsphere-load-amoxicillin-in-the-physical-chemical-and-biological-properties-of-an-experimental-endodontic-sealer
#7
Nélio Bairros Dornelles, Fabrício Mezzomo Collares, Bruna Genari, Gabriela de Souza Balbinot, Susana Maria Werner Samuel, Rodrigo Alex Arthur, Fernanda Visioli, Silvia Stanisçuaski Guterres, Vicente Castelo Branco Leitune
AIM: To develop an endodontic sealer with amoxicillin-loaded microsphere and to evaluate its properties. METHODS: Experimental sealer was obtained by mixing 70wt% UDMA, 15wt% GDMA and 15wt% BISEMA. In addition, CQ, DHEPT and PB were incorporated at 1 mol% and 0.01wt% BHT and 10wt% YbF3. Microspheres were produced by drying in spray dryer. Two experimental groups (10 and 15wt% of microspheres) and one control group (without microspheres) were formulated. The sealers were evaluated for the degree of conversion (n=3), degradation in solvent (n=3), drug release profile (n=3), antimicrobial activity (n=3), flow (n=3), film thickness (n=3) and cytotoxicity (n=3)...
October 26, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28841980/electrochemical-enzyme-biosensors-based-on-calcium-phosphate-materials-for-tyramine-detection-in-food-samples
#8
Marta Sánchez-Paniagua López, Esther Redondo-Gómez, Beatriz López-Ruiz
Electrochemical tyrosinase biosensors for tyramine determination were developed by the immobilization of the enzyme in calcium phosphate materials (CaPs) followed by cross-linking with glutaraldehyde. Tyramine was detected by the electrochemical reduction at -0.1V of the o- enzymatically-formed dopaquinone. Three different CaPs were explored as immobilization systems, monetite, brushite and brushite cement. Biosensors based on brushite matrices provide better analytical properties than the monetite one. Compared to brushite, a 10-fold increase of sensitivity was obtained with the brushite cement-based biosensor, which highlights the effect of brushite crystal formation in the presence of the enzyme in the biosensor performance...
December 1, 2017: Talanta
https://www.readbyqxmd.com/read/28816187/comparison-of-film-thickness-of-two-commercial-brands-of-glass-lonomer-cement-and-one-dual-cured-composite-an-in-vitro-study
#9
Rajat R Khajuria, Rishav Singh, Pranamee Barua, Nausheen Hajira, Naveen Gupta, Rohit R Thakkar
AIM: The present study is undertaken to examine the film thickness of three most commonly used luting cements and to determine their usage as a luting agent. MATERIALS AND METHODS: This study was carried out strictly according to the guidelines of American Dental Association (ADS) specification no. 8. Two glass slabs of 5 cm in length and 2 cm in width were used. One glass slab was kept over the other glass slab and the space between the two glass slabs was measured using metallurgical microscope at the power of 10*...
August 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/27957256/effect-of-different-mixing-methods-on-the-physical-properties-of-portland-cement
#10
Shahriar Shahi, Negin Ghasemi, Saeed Rahimi, Hamidreza Yavari, Mohammad Samiei, Farnaz Jafari
BACKGROUND: The Portland cement is hydrophilic cement; as a result, the powder-to-liquid ratio affects the properties of the final mix. In addition, the mixing technique affects hydration. The aim of this study was to evaluate the effect of different mixing techniques (conventional, amalgamator and ultrasonic) on some selective physical properties of Portland cement. MATERIAL AND METHODS: The physical properties to be evaluated were determined using the ISO 6786:2001 specification...
December 2016: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/27836148/volumetric-shrinkage-and-film-thickness-of-cementation-materials-for-veneers-an-in%C3%A2-vitro-3d-microcomputed-tomography-analysis
#11
Camila S Sampaio, João Malta Barbosa, Eduardo Cáceres, Lindiane C Rigo, Paulo G Coelho, Estevam A Bonfante, Ronaldo Hirata
STATEMENT OF PROBLEM: Few studies have investigated the volumetric polymerization shrinkage and film thickness of the different cementation techniques used to cement veneers. PURPOSE: The purpose of this in vitro study was to evaluate the volumetric polymerization shrinkage (VS) and film thickness (FT) of various cementation techniques through 3-dimensional (3D) microcomputed tomography (μCT). MATERIAL AND METHODS: Forty-eight artificial plastic maxillary central incisors with standard preparations for veneers were provided by a mannequin manufacturer (P-Oclusal) and used as testing models with the manufacturer's plastic veneers...
June 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27829765/comparative-study-on-the-tensile-bond-strength-and-marginal-fit-of-complete-veneer-cast-metal-crowns-using-various-luting-agents-an-in-vitro-study
#12
B Devi Parameswari, M Rajakumar, G Lambodaran, Shyam Sundar
INTRODUCTION: Several commercially available luting agents are used to cement the dental restorations such as intra-coronal, extra-coronal, and fixed partial dentures. Tensile bond strength (TBS) and accurate marginal fit are the essential factors to determine the good clinical results in fixed prosthesis. The retentivity of the luting cements is assessed by their adhesive capacity over the tooth surface and metal surface. Generally, the adhesive ability has been evaluated with in vitro testing, with tensile bond tests...
October 2016: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/27666498/selected-physical-properties-of-new-resin-modified-glass-ionomer-luting-cements
#13
Jason R Garner, Michael N Wajdowicz, Nicholas B DuVall, Howard W Roberts
STATEMENT OF PROBLEM: Two resin-modified glass ionomer (RMGI)-based luting agents have been recently marketed without independent reports of their physical properties. PURPOSE: The purpose of this in vitro study was to evaluate selected physical properties of 2 newly marketed RMGI luting agents and compare the findings with traditional materials. MATERIAL AND METHODS: Specimens (N=12) of Nexus RMGI, UltraCem, GC Fuji Cem 2, and RelyX Luting Plus were fabricated using standardized molds for flexural strength and fracture toughness according to manufacturer recommendations and stored in physiologic phosphate-buffered saline solution at 37°C until testing...
February 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27556553/relined-fiberglass-post-an-ex-vivo-study-of-the-resin-cement-thickness-and-dentin-resin-interface
#14
Niélli Caetano de Souza, Maurem Leitão Marcondes, Ricardo Vaz Breda, João Batista Blessmann Weber, Eduardo Gonçalves Mota, Ana Maria Spohr
The aim of this study was to evaluate the thickness of resin cements in the root thirds when using conventional fiberglass posts (CP) and relined fiberglass posts (RP) in weakened roots and to evaluate the morphological characteristics of the dentin-resin interface. Forty human maxillary anterior teeth had the crown sectioned below the cemento-enamel junction. The canals were endodontically treated and weakened with diamond burs. Teeth were divided into four groups (n = 10): Group 1 - CP + RelyX ARC; Group 2 - CP + RelyX U200; Group 3 - RP + RelyX ARC; and Group 4 - RP + RelyX U200...
August 18, 2016: Brazilian Oral Research
https://www.readbyqxmd.com/read/27556211/influence-of-resin-cement-shade-on-the-color-and-translucency-of-ceramic-veneers
#15
Daiana Kelly Lopes Hernandes, Cesar Augusto Galvão Arrais, Erick de Lima, Paulo Francisco Cesar, José Augusto Rodrigues
OBJECTIVE: This in vitro study evaluated the effect of two different shades of resin cement (RC- A1 and A3) layer on color change, translucency parameter (TP), and chroma of low (LT) and high (HT) translucent reinforced lithium disilicate ceramic laminates. MATERIAL AND METHODS: One dual-cured RC (Variolink II, A1- and A3-shade, Ivoclar Vivadent) was applied to 1-mm thick ceramic discs to create thin RC films (100 µm thick) under the ceramics. The RC was exposed to light from a LED curing unit...
July 2016: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/27538553/evaluation-of-marginal-internal-fit-of-chrome-cobalt-crowns-direct-laser-metal-sintering-versus-computer-aided-design-and-computer-aided-manufacturing
#16
S Gunsoy, M Ulusoy
BACKGROUND AND PURPOSE: The purpose of this study was to evaluate the internal and marginal fit of chrome cobalt (Co-Cr) crowns were fabricated with laser sintering, computer-aided design (CAD) and computer-aided manufacturing, and conventional methods. MATERIALS AND METHODS: Polyamide master and working models were designed and fabricated. The models were initially designed with a software application for three-dimensional (3D) CAD (Maya, Autodesk Inc.). All models were fabricated models were produced by a 3D printer (EOSINT P380 SLS, EOS)...
September 2016: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/27523906/properties-of-tricalcium-silicate-sealers
#17
Issam Khalil, Alfred Naaman, Josette Camilleri
INTRODUCTION: Sealers based on tricalcium silicate cement aim at an interaction of the sealer with the root canal wall, alkalinity with potential antimicrobial activity, and the ability to set in a wet field. The aim of this study was to characterize and investigate the properties of a new tricalcium silicate-based sealer and verify its compliance to ISO 6876 (2012). METHODS: A new tricalcium silicate-based sealer (Bio MM; St Joseph University, Beirut, Lebanon), BioRoot RCS (Septodont, St Maure de Fosses, France), and AH Plus (Dentsply, DeTrey, Konstanz, Germany) were investigated...
October 2016: Journal of Endodontics
https://www.readbyqxmd.com/read/27257101/rheological-and-mechanical-properties-and-interfacial-stress-development-of-composite-cements-modified-with-thio-urethane-oligomers
#18
Ataís Bacchi, Carmem S Pfeifer
OBJECTIVES: Thio-urethane oligomers have been shown to reduce stress and increase toughness in highly filled composite materials. This study evaluated the influence of thio-urethane backbone structure on rheological and mechanical properties of resin cements modified with a fixed concentration of the oligomers. METHODS: Thio-urethane oligomers (TU) were synthesized by combining thiols - pentaerythritol tetra-3-mercaptopropionate (PETMP) or trimethylol-tris-3-mercaptopropionate (TMP) - with isocyanates - 1,6-hexanediol-diissocyante (HDDI) (aliphatic) or 1,3-bis(1-isocyanato-1-methylethyl)benzene (BDI) (aromatic) or dicyclohexylmethane 4,4'-diisocyanate (HMDI) (cyclic), at 1:2 isocyanate:thiol, leaving pendant thiols...
August 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27143971/influence-of-the-cement-film-thickness-on-the-push-out-bond-strength-of-glass-fiber-posts-cemented-in-human-root-canals
#19
Natália Araújo Silva Prado, Reinaldo de Souza Ferreira, Marcos Henrique de Pinho Maurício, Sidnei Paciornik, Mauro Sayão de Miranda
The present study evaluated the influence of the cement film thickness on the push-out bond strength of glass fiber posts in the cervical, medium, and apical thirds of root canal spaces. Thirty roots were randomly divided into three groups, according to the fiber post system's drills: (G1) #2; (G2) #3; (G3) #4. The posts were cemented using a self-adhesive cement, and a small amount of powdered Rhodamine B was used as a stain. Images of both sides of each slice were obtained before and after the push-out test...
2016: International Journal of Dentistry
https://www.readbyqxmd.com/read/27022645/influence-of-light-irradiation-through-zirconia-on-the-degree-of-conversion-of-composite-cements
#20
Masanao Inokoshi, Pong Pongprueksa, Jan De Munck, Fei Zhang, Kim Vanmeensel, Shunsuke Minakuchi, Jozef Vleugels, Ignace Naert, Bart Van Meerbeek
PURPOSE: To assess the light irradiance (LI) delivered by two light-curing units and to measure the degree of conversion (DC) of three composite cements and one flowable composite when cured through zirconia or ceramic-veneered zirconia plates with different thicknesses. MATERIALS AND METHODS: Three dual-curing composite cements (Clearfil Esthetic Cement, Panavia F2.0, G-CEM LinkAce) and one light-curing flowable composite (G-aenial Universal Flo) were investigated...
2016: Journal of Adhesive Dentistry
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