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https://www.readbyqxmd.com/read/29150135/effect-of-different-resin-luting-cements-on-the-marginal-fit-of-lithium-disilicate-pressed-crowns
#1
Radek Mounajjed, Thomas J Salinas, Tomas Ingr, Basel Azar
STATEMENT OF PROBLEM: The vertical marginal discrepancy of restorations can increase upon cementation, and poor marginal fit can lead to cement dissolution, marginal discoloration, microleakage, and secondary caries. The amount of increase is related to the type of luting cement used, but how lithium disilicate pressed crowns are affected by different resin cements is unclear. PURPOSE: The purpose of this in vitro study was to compare the effect of using different resin luting cements on the vertical marginal discrepancy of lithium disilicate pressed crowns...
November 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29150017/insufficient-evidence-about-sleep-bruxism-being-a-risk-factor-for-ceramic-restoration-failure
#2
Romina Brignardello-Petersen
No abstract text is available yet for this article.
November 11, 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/29147713/variation-of-the-bone-forming-ability-with-the-physicochemical-properties-of-calcium-phosphate-bone-substitutes
#3
Rongquan Duan, Davide Barbieri, Xiaoman Luo, Jie Weng, Chongyun Bao, Joost D de Bruijn, Huipin Yuan
Because of their bioactive properties and chemical similarity to the inorganic component of bone, calcium phosphate (CaP) materials are widely used for bone regeneration. Six commercially available CaP bone substitutes (Bio-Oss, Actifuse, Bi-Ostetic, MBCP, Vitoss and chronOs) as well as two tricalcium phosphate (TCP) ceramics with either a micron-scale (TCP-B) or submicron-scale (TCP-S) surface structure are characterized and their bone forming potential is evaluated in a canine ectopic implantation model. After 12 weeks of implantation in the paraspinal muscle of four beagles, sporadic bone (0...
November 17, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/29144425/selective-laser-sintering-of-porous-silica-enabled-by-carbon-additive
#4
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/29144132/large-piezoelectric-effect-in-a-lead-free-molecular-ferroelectric-thin-film
#5
Wei-Qiang Liao, Yuan-Yuan Tang, Peng-Fei Li, Yu-Meng You, Ren-Gen Xiong
Piezoelectric materials have been widely used in various applications, such as high-voltage sources, actuators, sensors, motors, fre-quency standard, vibration reducer, and so on. In the past decades, lead zirconate titanate (PZT) binary ferroelectric ceramics have dominated the commercial piezoelectric market due to their excellent properties near the morphotropic phase boundary (MPB), although they contain more than 60% toxic lead element. Here, we report a lead-free and one-composition molecular ferroelectric trimethylbromomethylammonium tribromomanganese (ΙΙ) (TMBM-MnBr3) with a large piezoelectric coefficient d33 of 112 pC/N along polar axis, comparable with those of typically one-composition piezoceramics such as BaTiO3 along polar axis [001] (~90 pC/N) and much greater than those of most known molecular ferroelectrics (almost below 40 pC/N)...
November 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29144007/analysis-of-surface-roughness-fracture-toughness-and-weibull-characteristics-of-different-framework-veneer-dental-ceramic-assemblies-after-grinding-polishing-and-glazing
#6
Guillermo Pradíes, Laura Godoy-Ruiz, Mutlu Özcan, Isabel Moreno-Hay, Francisco Martínez-Rus
PURPOSE: To compare the surface roughness and biaxial flexural strength of dental ceramics obtained after chairside surface modification by mechanical polishing procedures, versus laboratory reglazing. MATERIALS AND METHODS: Discs (16 × 1.5 ± 1.6 mm) (N = 90) of various framework-veneering combinations were fabricated: D/FC: lithium disilicate/feldspathic ceramic; Z/AL: zirconium dioxide/aluminous ceramic; N/FC: noble alloy/feldspathic ceramic; N/FF: noble alloy feldspathic with fluorapatite; B/FC: base alloy/feldspathic ceramic; B/FF: base alloy/feldspathic ceramic with fluorapatite...
November 16, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29143397/marginal-fit-comparison-of-cad-cam-crowns-milled-from-two-different-materials
#7
Atousa Azarbal, Mohsen Azarbal, Robert L Engelmeier, Thomas C Kunkel
PURPOSE: To evaluate the marginal fit of CAD/CAM copings milled from hybrid ceramic (Vita Enamic) blocks and lithium disilicate (IPS e.max CAD) blocks, and to evaluate the effect of crystallization firing on the marginal fit of lithium disilicate copings. MATERIALS AND METHODS: A standardized metal die with a 1-mm-wide shoulder finish line was imaged using the CEREC AC Bluecam. The coping was designed using CEREC 3 software. The design was used to fabricate 15 lithium disilicate and 15 hybrid ceramic copings...
November 16, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29142648/comparison-of-the-optical-properties-of-pre-colored-dental-monolithic-zirconia-ceramics-sintered-in-a-conventional-furnace-versus-a-microwave-oven
#8
Hee-Kyung Kim, Sung-Hun Kim
PURPOSE: The purpose of this study was to compare the optical properties of pre-colored dental monolithic zirconia ceramics of various thicknesses sintered in a microwave and those in a conventional furnace. MATERIALS AND METHODS: A2-shade of pre-colored monolithic zirconia ceramic specimens (22.0 mm × 22.0 mm) in 3 thickness groups of 0.5, 1.0, and 1.5 mm were divided into 2 subgroups according to the sintering methods (n=9): microwave and conventional sintering...
October 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29142647/effects-of-staining-liquids-and-finishing-methods-on-translucency-of-a-hybrid-ceramic-material-having-two-different-translucency-levels
#9
Sebnem Ulviye Buyukkaplan, Mehmet Mustafa Özarslan, Çağatay Barutcigil, Merve Arslan, Kubilay Barutcigil, Elif Ece Yoldan
PURPOSE: Beverages may affect the translucency of esthetic dental restorative materials. The aim of the present study was to investigate the effects of coffee and red wine on the translucency of a PICN material with two translucency levels, and finished with different methods. MATERIALS AND METHODS: 2M2 high translucent and translucent VITA Enamic hybrid ceramic blocks were investigated. Rectangular specimens with the dimensions of 12 mm × 14 mm × 2 mm were prepared...
October 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29141360/-total-hip-arthroplasty-in-patients-with-psoriatic-arthritis
#10
Y Li, X S Weng, J Lin, J Jin, W W Qian
Objective: To evaluate the clinical efficacy of Total hip arthroplasty (THA) in treating the hip joint involvement of Psoriatic arthritis (PsA). Methods: From January 2005 to December 2016, a total of 15 PsA patients (20 hip joints) underwent THA in Department of Orthopaedics, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College. All the patients had obvious restriction in daily life before operation. The mean Harris score was 25.2 averagely and the mean total range of the hip joint movement was 39...
November 7, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29140719/effects-of-different-etching-methods-and-bonding-procedures-on-shear-bond-strength-of-orthodontic-metal-brackets-applied-to-different-cad-cam-ceramic-materials
#11
S Kutalmış Buyuk, Ahmet Serkan Kucukekenci
OBJECTIVE: To investigate the shear bond strength (SBS) of orthodontic metal brackets applied to different types of ceramic surfaces treated with different etching procedures and bonding agents. MATERIALS AND METHODS: Monolithic CAD/CAM ceramic specimens (N = 120; n = 40 each group) of feldspathic ceramic Vita Mark II, resin nanoceramic Lava Ultimate, and hybrid ceramic Vita Enamic were fabricated (14 × 12 × 3 mm). Ceramic specimens were separated into four subgroups (n = 10) according to type of surface treatment and bonding onto the ceramic surface...
November 15, 2017: Angle Orthodontist
https://www.readbyqxmd.com/read/29140098/surface-roughness-of-methacrylate-and-silorane-based-composites-after-finishing-and-polishing-procedures
#12
M Jacinta Santos, Heleine Maria Chagas Rêgo, Leticia Linares, Amin S Rizkalla, Gildo C Santos
OBJECTIVE: To compare the effect of surface finishing and polishing protocols on the surface roughness (Ra) of methacrylate-based and silorane-based resin composites. METHODS AND MATERIALS: Fifty specimens (5 mm x 2 mm) of each composite material were prepared using a split mold: Filtek™ Supreme Ultra (3M ESPE), Tetric EvoCeram® (Ivoclar Vivadent), Tetric Ceram™ HB (Ivoclar Vivadent), and Filtek™ LS Low Shrink (3M ESPE). Specimens were divided into five groups (n = 10) according to the following procedures: G1 - 15-µm fine diamond bur (FDB); G2 - 15-µm FDB followed by a 20-fluted tungsten carbide bur; G3 - 15-µm FDB followed by diamond-impregnated micropolishing points (D-FINE Double Diamond Polishing System, Clinician's Choice); G4 - 15-µm FDB followed by diamond-impregnated micropolishing points (Flame Point Pre-polisher and Shine, Brassseler USA); and G5 - 15-µm FDB followed by the application of a surface sealer (PermaSeal®, Ultradent Products, Inc...
November 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/29139209/protocol-for-a-new-concept-of-no-prep-ultrathin-ceramic-veneers
#13
Camillo D'Arcangelo, Mirco Vadini, Maurizio D'Amario, Zaccheo Chiavaroli, Francesco De Angelis
OBJECTIVES: No-prep veneers, although ideally considered the best option because of tooth structure maximum preservation, have been frequently criticized for some potential limitations including esthetic outcomes and periodontal complications. CLINICAL CONSIDERATIONS: A new protocol to optimize no-prep veneers restorations is presented. A key point of the proposed technique is to identify optimal margins' positions: margin is positioned in the point of maximum convexity of teeth, avoiding the over contouring of traditional no-prep veneers...
November 15, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29137777/zinc-oxide-nanoleaves-a-scalable-disperser-assisted-sonochemical-approach-for-synthesis-and-an-antibacterial-application
#14
Anadi Gupta, Rohit Srivastava
Current study reports a new and highly scalable method for the synthesis of novel structure Zinc oxide nanoleaves (ZnO-NLs) using disperser-assisted sonochemical approach. The synthesis was carried out in different batches from 50mL to 1L to ensure the scalability of the method which produced almost similar results. The use of high speed (9000rpm) mechanical dispersion while bath sonication (200W, 33kHz) yield 4.4g of ZnO-NLs powder in 1L batch reaction within 2h (>96% yield). The ZnO-NLs shows an excellent thermal stability even at a higher temperature (900°C) and high surface area...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137192/influence-of-kmno%C3%A2-concentrationon-infrared-emissivity-of-coatings-formed-on-tc4-alloys-by-micro-arc-oxidation
#15
Guangrui Gao, Ying Li, Chaozhong Li, Dan Hu, Zhengxian Li, Zhengping Xi
Ceramic coatings with high emissivity were fabricated on TC4 alloys by micro-arc oxidation technique (MAO) in mixed silicate and phosphate electrolytes with varying KMnO₄ addition. The microstructure, phase and chemical composition were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), and the infrared emissivity of the MAO coatings was measured in a waveband of 5-20 μm. The results show that the thickness of the coatings increased with the addition of KMnO₄, but the roughness of the coatings first decreased and then increased slightly due to the inhibitory effect of KMnO₄ on Na₂SiO₃ deposition...
November 13, 2017: Materials
https://www.readbyqxmd.com/read/29134804/concurrent-la-and-a-site-vacancy-doping-modulates-the-thermoelectric-response-of-srtio3-experimental-and-computational-evidence
#16
Feridoon Azough, Samuel S Jackson, Dursun Ekren, Robert Freer, Marco Molinari, Stephen R Yeandel, Pooja M Panchmatia, Stephen C Parker, David Hernandez Maldonado, Demie M Kepaptsoglou, Quentin M Ramasse
To help understand the factors controlling the performance of one of the most promising n-type oxide thermoelectrics SrTiO3, we need to explore structural control at the atom level. In Sr1-xLa2x/3TiO3 ceramics (0.0 ≤ x ≤ 0.9), we determined that the thermal conductivity can be reduced and controlled through an interplay of La substitution and A-site vacancies and the formation of a layered structure. The decrease in thermal conductivity with La and A-site vacancy substitution dominates the trend in the overall thermoelectric response...
November 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29132426/comment-on-a-re-assessment-of-the-safety-of-silver-in-household-water-treatment-rapid-systematic-review-of-mammalian-in-vivo-genotoxicity-studies
#17
EDITORIAL
Daniele Lantagne, Justine Rayner, Anjuliee Mittelman, Kurt Pennell
We wish to thank Fewtrell, Majuru, and Hunter for their article highlighting genotoxic risks associated with the use of particulate silver for primary drinking water treatment. The recent promotion of colloidal silver products for household water treatment in developing countries is problematic due to previously identified concerns regarding manufacturing quality and questionable advertising practices, as well as the low efficiency of silver nanoparticles to treat bacteria, viruses, and protozoa in source waters...
November 13, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/29132098/understanding-the-mechanism-for-the-mechanical-property-degradation-of-a-lithium-disilicate-glass-ceramic-by-annealing
#18
D Li, X C Li, Z Z Zhang, S F Zhang, L He
Post-crystallization annealing above the Tg was applied to a lithium disilicate glass-ceramic with microstructure consisting of glassy matrix and rod-like lithium disilicate crystals, effect of the annealing on the mechanical behavior was investigated. Flexural strength and VIF toughness of the glass-ceramic unexpectedly decreased after the annealing. The mechanical behavior variation was understood based on residual micro-stress analysis. Coefficient of thermal expansion for the glassy matrix presented a tendency to increase after the annealing, which would enlarge the thermal expansion mismatch between the glassy matrix and the lithium disilicate crystals...
November 3, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29131566/a-new-class-of-lagp-based-solid-polymer-composite-electrolyte-for-efficient-and-safe-solid-state-lithium-batteries
#19
Qingpeng Guo, Yu Han, Hui Wang, Shizhao Xiong, Yujie Li, Shuangke Liu, Kai Xie
Inorganic solid electrolytes (SEs) possess substantial safety and electrochemical stability, which make them as key components of the safe rechargeable solid-state Li batteries with high energy density. However, complicated integrally molding process, the poor wettability between SE and active materials are the most challenging barriers for the application of SEs. In this regard, we explore composite SE of the active ceramic Li1+xAlxGe2-x(PO4)3 (LAGP) as the main medium for ion-conducting and the polymer P(VDF-HFP) as matrix...
November 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29131460/pilot-study-on-the-effectiveness-and-students-attitude-towards-undergraduate-training-provided-by-industry
#20
M Karl, M Franz, T Grobecker-Karl, M Scheib
INTRODUCTION: Rapid developments in CAD/CAM technology necessitate the adaptation of curriculum content. Limited resources hinder institutions in holding state of the art equipment available for student training. MATERIALS AND METHODS: A workshop given by an industry partner was organised as part of the final pre-clinical course in prosthodontics for the academic years 2015 and 2016. The workshop on dental ceramics and CAD/CAM technology comprised of lectures and practical demonstrations...
November 13, 2017: European Journal of Dental Education: Official Journal of the Association for Dental Education in Europe
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