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https://www.readbyqxmd.com/read/29909351/a-contribution-to-the-characterization-of-the-silicate-water-interface-part-i-implication-of-a-new-polished-sample-hydration-technique
#1
T Sowoidnich, L Gordon, C Naber, F Bellmann, J Neubauer, D Joester
The analysis of the atomic composition of the interface between tricalcium silicate (C3 S), the main compound of Ordinary Portland Cement, and surrounding solution is still a challenging task. At the same time, that knowledge is of profound importance for describing the basic processes during hydration. By means of Scanning Electron Microscopy (SEM) and Atom Probe Tomography (APT) we combine modern techniques in order to shed light on this topic in the present study. The results of these methods are compared with conduction calorimetry as a standard technique to study the hydration kinetics of cement...
June 11, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29908749/mercury-flows-in-large-scale-gold-production-and-implications-for-hg-pollution-control
#2
Qingru Wu, Shuxiao Wang, Mei Yang, Haitao Su, Guoliang Li, Yi Tang, Jiming Hao
Large-scale gold production (LSGP) is one of the five convention-related atmospheric mercury (Hg) emission sources in the Minamata Convention on Mercury. However, field experiments on Hg flows of the whole process of LSGP are limited. To identify the atmospheric Hg emission points and understand Hg emission characteristics of LSGP, Hg flows in two gold smelters were studied. Overall atmospheric Hg emissions accounted for 10%-17% of total Hg outputs and the Hg emission factors for all processes were 7.6-9.6kg/ton...
June 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29908356/total-hip-arthroplasty-after-failed-fixation-of-a-proximal-femur-fracture-analysis-of-59-cases-of-intra-and-extra-capsular-fractures
#3
Antoine Morice, Florian Ducellier, Pascal Bizot
INTRODUCTION: The indications for total hip arthroplasty (THA) after failed internal fixation of a proximal femur fracture vary. Published studies on this topic are broad-ranging and do not distinguish between intracapsular and extracapsular fractures. This led us to conduct a retrospective analysis comparing the clinical outcomes, radiological outcomes, technical problems and complications between these two types of fractures. HYPOTHESIS: The functional outcomes of THA after an extracapsular fracture will be worse than the ones after an intracapsular fracture...
June 13, 2018: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/29906270/effect-of-different-esthetic-post-core-materials-on-color-of-direct-composite-restorations-a-preliminary-clinical-study
#4
Buket Ayna, Berivan D Yılmaz, Bozan S Izol, Emrah Ayna, İbrahim Halil Tacir
BACKGROUND The purpose of this study was to determine the influence of 2 different esthetic post materials on the final color of direct-composite restorations by using a digital technique under in vivo conditions. MATERIAL AND METHODS We included 22 pulpless incisor teeth treated with conventionally cemented zirconia (n=11) and polyethylene fiber (n=11) posts in the study. Teeth were restored with a hybrid resin. The color of direct-composite restorations and contralateral control teeth was measured using a digital technique...
June 15, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29904754/effect-of-different-surface-treatments-on-the-tensile-bond-strength-to-lithium-disilicate-glass-ceramics
#5
Sai Kham Lyann, Tomohiro Takagaki, Toru Nikaido, Motohiro Uo, Masaomi Ikeda, Alireza Sadr, Junji Tagami
PURPOSE: To evaluate the influence of different surface treatments of lithium disilicate glass ceramics on the bonding efficacy of three luting composites. MATERIALS AND METHODS: A total of 450 blocks of e.max CAD (Ivoclar Vivadent) ground with 600-grit silicon carbide paper were prepared and divided into three groups (n = 150) according to the composite cements used: Variolink Esthetic DC (VE), Multilink Automix (MA), and SpeedCEM (SC). Each group was further divided into five subgroups (n = 10) according to the surface treatment performed: no treatment (control), Monobond Plus (MP), 37% phosphoric acid and Monobond Plus (PA), < 5% hydrofluoric acid and Monobond Plus (HF), and Monobond Etch & Prime (ME)...
June 14, 2018: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/29902777/physico-mechanical-properties-of-resin-cement-light-cured-through-different-ceramic-spacers
#6
Fabio Antonio Piola Rizzante, Paula Minatel Locatelli, Thiago Soares Porto, Ana Flávia Sanches Borges, Rafael Francisco Lia Mondelli, Sérgio Kiyoshi Ishikiriama
The purpose of this in vitro study was to compare the micro hardness, color stability/ΔE, and degree of conversion/DC of a resin cement light cured through different ceramic spacers. Lithium-disilicate ceramic samples were obtained from IPS E-max CAD blocks (HT A1) and IPS in-Ceram (transparent neutral); and divided in 7 groups (n = 8 for each test): CTR/control group; 06 M/0.6 mm monolithic; 12 M/1.2 mm monolithic; 20 M/2.0 mm monolithic; 06B/0.4 + 0.2 mm bilayered; 12B/1.0 + 0.2 mm bilayered; 20B/1...
June 4, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29902724/evaluation-of-morphology-and-size-of-cracks-of-the-interfacial-transition-zone-itz-in-concrete-containing-fly-ash-fa
#7
Grzegorz Ludwik Golewski
Interfacial Transition Zone (ITZ) of coarse aggregate cement matrix is commonly regarded as the weakest element of concrete. In this phase - the first cracks in the material are initiated, and the process of destruction of the composite begins. An improvement of the ITZ properties are positively influenced by the mineral additives used for the composite. One of such a substitute for a binder is, potentially hazardous industrial waste, siliceous fly ash (FA). In this paper the ITZ between aggregate and cement paste in concretes containing FA is considered...
June 7, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29900907/preventive-endodontics-by-direct-pulp-capping-with-restorative-dentin-substitute-biodentine-a-series-of-fifteen-cases
#8
Kavita Dube, Pradeep Jain, Arti Rai, Bonny Paul
Introduction: Treatment of mechanical exposure of the pulp during caries excavation presents a clinical challenge. In this case series of 15 patients, with a follow-up period of over a year, the outcome of direct pulp capping with Biodentine (septodont) after mechanical pulp exposure was assessed. Aim of Study: The aim of this study is to evaluate the outcome of direct pulp capping with Biodentine in deeply carious teeth when pulp was mechanically exposed during caries excavation and cavity preparation...
May 2018: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/29900382/dataset-on-the-durability-behavior-of-palm-oil-fuel-ash-self-compacting-concrete
#9
O M Ofuyatan, S O Edeki
Datasets contained in this article are outcomes of the durability properties carried out on Palm Oil Fuel Ash (POFA) concrete specimens to determine the effect of acid attack, Sulphate resistance, water absorption and rapid chloride permeability. Specimens were immersed in 1% hydrochloric acid (H2 SO4 ) solution, 5% sodium Sulphate for 28, 56 and 90 days and different exposure conditions. The dataset helps the readers to understand and evaluate the potential of POFA though a waste material can be used as a replacement of Portland cement in having durability properties at an acceptable range...
August 2018: Data in Brief
https://www.readbyqxmd.com/read/29900201/data-on-effect-of-a-reducer-of-water-and-retarder-of-setting-time-admixtures-of-cement-pastes-and-mortar-in-hardened-stat
#10
Mohammed Husssein Khudhair, Mohamed S El Youbi, Ahmed Elharfi
The aim of this work is to study the influence of the admixture of superplasticizers on the physical properties of cement paste to know the initial and final time, water content and mechanical performance of concrete. In this work we have incorporated an Advanced Superplasticité for Prolonged Slump Retention (ASPPSR402) in the formulation matrix of concrete at different percentages ranging from 0.5% to 5% by weight of cement with a step of 0.5%, while partially substituting the mixing water by the last one to reduce the amount of water used...
June 2018: Data in Brief
https://www.readbyqxmd.com/read/29899637/the-effect-of-red-wine-on-colour-stability-of-three-different-types-of-esthetic-restorative-materials-an-in-vitro-study
#11
Yadav Chakravarthy, Sonu Clarence
Aim and Objective: To evaluate the in vitro effect of red wine on color stability of three different esthetic restorative materials such as nanohybrid composites, conventional restorative glass ionomer cement (GIC), and feldspathic porcelain. Materials and Methods: The color stability of test materials was determined using a spectrophotometer. A total of 30 specimens were prepared (10 from each) from each material on a round metal mold (11 mm diameter and 2 mm deep)...
May 2018: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29899623/analysis-of-the-porosity-of-endodontic-sealers-through-micro-computed-tomography-a-systematic-review
#12
REVIEW
Fabricio Guerrero Ortiz, Esther Berástegui Jimeno
Endodontic treatments have as their objective the appropriate sealing of the space caused by the root canal, providing a complete seal of the canal in all dimensions, creating an airtight seal against fluids. Thus, endodontic cements must possess physical properties such as solubility and long-term dimensional stability. An electronic search in the main endodontic magazines using appropriate keywords to identify studies that investigated the porosity of endodontic materials using micro-computed tomography. Of the 125 studies researched, 16 fulfilled the criteria for inclusion...
May 2018: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29898069/feldspar-ceramic-strength-and-the-reinforcing-effect-by-adhesive-cementation-under-accelerated-aging
#13
Fabíola Jardim Barbon, Rafael Ratto Moraes, Noéli Boscato, Rodrigo Alessandretti, Aloísio Oro Spazzin
This study evaluated the effect of the accelerated artificial aging (AAA) on feldspar ceramic strength and the reinforcing effect promoted by adhesive cementation with resin luting agent. One hundred twenty feldspar ceramic disks were obtained. Sixty disks were acid-etched, silanized, and coated with an experimental resin luting agent simulating the adhesive luting procedures. Four groups were created (n=30): uncoated ceramic (control group), uncoated ceramic submitted to AAA, ceramic coated with resin luting agent, and coated ceramic submitted to AAA...
March 2018: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29898067/effect-of-blood-contamination-on-the-push-out-bond-strength-of-calcium-silicate-cements
#14
Flavia Kolling Marquezan, Patricia Maria Poli Kopper, Angela Isabel Dos Santos Dullius, Diego Machado Ardenghi, Renata Grazziotin-Soares
This study investigated the effect of blood-contamination on the push-out bond strength of BiodentineTM (BD) and MTA Angelus® (MTA-A) to root dentin over time. Twenty-five teeth were sectioned horizontally to obtain 120 root slices. The lumens were filled with MTA-A or BD: 60 for each cement (30 uncontaminated and 30 blood contaminated). Push out bond strength to dentin was assessed at 24 h (n=10), 7 days (n=10) and 28 days (n=10). Failure modes were classified as: cohesive, adhesive or mixed failure. Two-way ANOVA was used to investigate the interaction between blood contamination vs...
March 2018: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29898057/glass-ionomer-cements-can-be-used-for-bonding-orthodontic-brackets-after-cancer-radiation-treatment
#15
Gabriela Cristina Santin, Alexandra Mussolino de Queiroz, Regina Guenka Palma-Dibb, Harley Francisco de Oliveira, Paulo Nelson Filho, Fábio Lourenço Romano
Patients undergoing radiotherapy treatment present more susceptibility to dental caries and the use of an orthodontic device increases this risk factor due to biofilm accumulation around the brackets. The objective of this study was to evaluate the shear bond strength to irradiated permanent teeth of orthodontic brackets bonded with conventional glass ionomer cement and resin-modified glass ionomer cement due to the fluoride release capacity of these materials. Ninety prepared human premolars were divided into 6 groups (n=15), according to the bonding material and use or not of radiation: CR: Transbond XT composite resin; RMGIC: Fuji Ortho LC conventional glass ionomer cement; GIC: Ketac Cem Easymix resin-modified glass ionomer cement...
March 2018: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29898019/inorganic-filler-content-of-resin-based-luting-agents-and-the-color-of-ceramic-veneers
#16
Fabíola Jardim Barbon, Rafael Ratto Moraes, Joseane Viccari Calza, Ana Paula Perroni, Aloísio Oro Spazzin, Noéli Boscato
The influence of inorganic filler content of resin-based luting agents (RBLAs) on color change (ΔE00), CIEL*a*b* (individual color coordinates), and translucency parameters (TP) of simulated ceramic laminate veneer (CLV) was investigated. RBLAs with low, intermediate, and high inorganic filler content (55%, 65%, and 75% mass fractions, respectively) were prepared. Feldspar ceramic (Vitablocs Mark II) specimens (1.2 mm × 0.8 mm, A1C shade) were bonded to simulated composite resin substrates (1.6 mm × 1.2 mm, A2D shade) using three experimental and a commercial (RelyX Veneer) RBLA (translucent shade)...
June 7, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/29898001/discrete-particle-model-for-cement-infiltration-within-open-cell-structures-prevention-of-osteoporotic-fracture
#17
Samuel Jesús Ramos-Infante, Amadeo Ten-Esteve, Angel Alberich-Bayarri, María Angeles Pérez
This paper proposes a discrete particle model based on the random-walk theory for simulating cement infiltration within open-cell structures to prevent osteoporotic proximal femur fractures. Model parameters consider the cement viscosity (high and low) and the desired direction of injection (vertical and diagonal). In vitro and in silico characterizations of augmented open-cell structures validated the computational model and quantified the improved mechanical properties (Young's modulus) of the augmented specimens...
2018: PloS One
https://www.readbyqxmd.com/read/29897351/midfacial-tissue-assessment-of-the-effect-of-amount-of-keratinized-mucosa-on-immediate-temporarization-of-fresh-socket-implants-8-year-follow-up
#18
Roberto Crespi, Paolo Capparé, Giovanni Crespi, Giorgio Gastaldi, Georgios E Romanos, Enrico Gherlone
The aim of the present study was to consider the long-term midfacial mucosal outcome around final prosthetic restorations on dental implants placed and loaded immediately after tooth extractions. A total of 42 patients requiring tooth extractions were recruited, and 142 teeth were extracted. Based on the amount of keratinized mucosa (KM), implants were categorized into group A (KM ≥ 2 mm; n = 61) or group B (KM < 2 mm; n = 62). In both groups, all patients received temporary prosthetic restorations immediately after the surgical procedure...
June 12, 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29896958/atomistic-simulations-of-geopolymer-models-the-impact-of-disorder-on-structure-and-mechanics
#19
Francesca Lolli, Hegoi Manzano, John L Provis, Maria Chiara Bignozzi, Enrico Masoero
Geopolymers are hydrated alumino-silicates with excellent binding properties. Geopolymers appeal to the construction sector as a more sustainable alternative to traditional cements, but their exploitation is limited by a poor understanding of the linkage between chemical composition and macroscopic properties. Molecular simulations can help clarify this linkage, but existing models based on amorphous or crystalline aluminosilicate structures provide only a partial explanation of experimental data at the nanoscale...
June 13, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29896787/fatigue-behavior-of-different-cad-cam-materials-for-monolithic-implant-supported-molar-crowns
#20
Bruno Salles Sotto-Maior, Rafael Corrêa Carneiro, Carlos Eduardo Francischone, Neuza Maria Souza Picorelli Assis, Karina Lopes Devito, Plinio Mendes Senna
PURPOSE: To evaluate the fracture resistance after the thermal and mechanical fatigue of feldspathic, lithium disilicate, and resin-modified CAD/CAM monolithic crowns cemented onto a universal post abutment. MATERIALS AND METHODS: A right second mandibular molar was designed in CAD/CAM software, and 30 crowns were machined using three different materials (n = 10): feldspathic ceramic, finished only with a glaze cycle (G1); lithium disilicate, sintered and finished with a glaze cycle (G2); and resin, modified by nanoceramic and finished with rubber (G3)...
June 13, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
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