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https://www.readbyqxmd.com/read/28319660/novel-mof-uio-66-layer-a-highly-oriented-membrane-with-good-selectivity-and-hydrogen-permeance
#1
Sebastian Friebe, Benjamin Geppert, Frank Steinbach, Jürgen Caro
The 3D MOF structure UiO-66 [Zr6O4(OH)4(bdc)6], featuring triangular pores of approximately 6 Å, has been successfully prepared as thin supported membrane layer with high crystallographic orientation on ceramic α-Al2O3 supports. The adhesion of the MOF layer to the ceramic support was investigated in different taxing conditions. Furthermore, by coating this UiO-66 membrane with a thin polyimide (Matrimid) top layer we prepared a multilayer composite. Said membranes have been evaluated in the separation of hydrogen (H2) from different binary mixtures at room temperature...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28319213/comparison-of-the-marginal-fit-of-cobalt-chromium-metal-ceramic-crowns-fabricated-by-cad-cam-techniques-and-conventional-methods-at-three-production-stages
#2
Francisco Real-Voltas, Elisabeth Romano-Cardozo, Oscar Figueras-Alvarez, Magi Brufau-de Barbera, Josep Cabratosa-Termes
PURPOSE: The aim of this study was to compare the marginal fit of cobalt-chromium crowns fabricated using conventional casts and computer-aided design/computer-assisted manufacturing (CAD/CAM) techniques at three stages of production: metal coping, after porcelain firing, and after cementation. MATERIALS AND METHODS: A total of 80 metal-ceramic crowns were fabricated using four different techniques: lost wax casting, milling, laser sintering, and milling of a presintered metal block...
March 20, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28303598/three-dimensional-finite-element-analysis-of-zirconia-all-ceramic-cantilevered-fixed-partial-dentures-with-different-framework-designs
#3
Shoko Miura, Shin Kasahara, Shinobu Yamauchi, Hiroshi Egusa
The purpose of this study were: to perform stress analyses using three-dimensional finite element analysis methods; to analyze the mechanical stress of different framework designs; and to investigate framework designs that will provide for the long-term stability of both cantilevered fixed partial dentures (FPDs) and abutment teeth. An analysis model was prepared for three units of cantilevered FPDs that assume a missing mandibular first molar. Four types of framework design (Design 1, basic type; Design 2, framework width expanded buccolingually by 2 mm; Design 3, framework height expanded by 0...
March 17, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/28301026/characterization-of-conventional-and-high-translucency-y-tzp-dental-ceramics-submitted-to-air-abrasion
#4
Bhenya Ottoni Tostes, Renato Bastos Guimarães, Jaime Dutra Noronha-Filho, Glauco Dos Santos Botelho, José Guilherme Antunes Guimarães, Eduardo Moreira da Silva
This study evaluated the effect of air-abrasion on t®m phase transformation, roughness, topography and the elemental composition of three Y-TZP (Yttria-stabilized tetragonal zirconia polycrystal) dental ceramics: two conventional (Lava Frame and IPS ZirCad) and one with high-translucency (Lava Plus). Plates obtained from sintered blocks of each ceramic were divided into four groups: AS (as-sintered); 30 (air-abrasion with 30 mm Si-coated Al2O3 particles); 50 (air-abrasion with 50 mm Al2O3 particles) and 150 (air-abrasion with 150 mm Al2O3 particles)...
January 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/28300706/tapered-stems-one-third-proximally-coated-have-higher-complication-rates-than-cylindrical-two-third-coated-stems-in-patients-with-high-hip-dislocation-undergoing-total-hip-arthroplasty-with-step-cut-shortening-osteotomy
#5
Vahit Emre Ozden, Goksel Dikmen, Burak Beksac, Ismail Remzi Tozun
BACKGROUND: The results of cementless stems in total hip arthroplasty (THA) done because of congenital dislocation with step-cut osteotomy is not well known, particularly the influence of the design and the role of extent of porous coating. Therefore we performed a retrospective study to evaluate the mid to long-term results THA performed with a single type acetabular component and different geometry and fixation type stems with ceramic bearings in the setting of step-cut subtrochanteric osteotomy in high hip dislocated (HHD) patients...
March 11, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28300705/comparison-of-wear-rate-and-osteolysis-between-second-generation-annealed-and-first-generation-remelted-highly-cross-linked-polyethylene-in-total-hip-arthroplasty-a-case-control-study-at-a-minimum-of-five-years
#6
Ryohei Takada, Tetsuya Jinno, Daisuke Koga, Kazumasa Miyatake, Takeshi Muneta, Atsushi Okawa
BACKGROUND: There is no previous report that directly compared wear resistance of second-generation annealed highly cross-linked polyethylene with that of first-generation remelted highly cross-linked polyethylene. We therefore performed a retrospective study at a minimum of 5-year follow-up comparing second-generation annealed and first-generation remelted highly cross-linked polyethylene in order to: (1) assess wear rates and (2) compare the incidence of osteolysis between, (3) identify the frequency of complication related to the two types of highly cross-linked polyethylene...
March 11, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28296983/comparing-the-fracture-resistance-of-alternatively-engineered-zirconia-abutments-with-original-equipment-manufactured-abutments-with-different-implant-connection-designs
#7
Joseph M Jarman, Techkouhie Hamalian, Anthony P Randi
PURPOSE: Aftermarket computer-aided design/computer-assisted manufacture (CAD/CAM) milled zirconia (Zr) abutments were recently introduced with minimal independent research regarding their fracture resistance. Third-party manufacturers often alter the original equipment manufacturers' (OEM) design with unknown effects on fracture resistance. These alterations include elimination of the titanium insert with subsequent introduction of Zr into the implant, changes to connection designs and shapes, and/or alterations to prosthetic screw design...
March 15, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28294205/fracture-resistance-of-different-implant-abutments-supporting-%C3%A2-all-ceramic-single-crowns-after-aging
#8
Michael Stimmelmayr, Philipp Heiß, Kurt Erdelt, Josef Schweiger, Florian Beuer
OBJECTIVE: To test the mechanical properties of three different restorative materials for implant abutments supporting all-ceramic single crowns. MATERIALS AND METHODS: Thirty implants with butt-joint connections were distributed into three test groups: Group A with 10 one-piece zirconia abutments, Group U with 10 titanium abutments, and Group T with 10 titanium-zirconia hybrid abutments. Monolithic zirconia single crowns were cemented and artificially aged. The crowns were loaded at a 30-degree angle in a universal testing machine until fracture or bending...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28279435/three-dimensional-characterization-and-distribution-of-fabrication-defects-in-bilayered-lithium-disilicate-glass-ceramic-molar-crowns
#9
Yutao Jian, Zi-Hua He, Li Dao, Michael V Swain, Xin-Ping Zhang, Ke Zhao
OBJECTIVE: To investigate and characterize the distribution of fabrication defects in bilayered lithium disilicate glass-ceramic (LDG) crowns using micro-CT and 3D reconstruction. METHODS: Ten standardized molar crowns (IPS e.max Press; Ivoclar Vivadent) were fabricated by heat-pressing on a core and subsequent manual veneering. All crowns were scanned by micro-CT and 3D reconstructed. Volume, position and sphericity of each defect was measured in every crown. Each crown was divided into four regions-central fossa (CF), occlusal fossa (OF), cusp (C) and axial wall (AW)...
March 6, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28276147/implant-guided-supracrestal-alveolar-bone-growth-using-scaffolds-bmp-2-and-novel-scaffold-retaining-device
#10
Bo Wen, David Shafer, Peter Schleier, David Pendrys, Liisa Kuhn, Martin Freilich
OBJECTIVE: To evaluate the efficacy of various scaffold systems and a Ti scaffold-retaining device with and without non-glycosylated rhBMP-2 (BMP-2) for increasing the vertical alveolar bone growth in the intra-oral mini-pig model. METHODS: Forty-eight Straumann Bone Level implants with hydrophilic (SLActive) surfaces were partially embedded in mandibles of 12 adult mini-pigs with the shoulder of the implant located 3 mm above the bone crest. Twenty-four implants were placed in conjunction with BMP-2 (50 μg) incorporated within resorbable scaffolds...
March 9, 2017: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/28275786/-effects-of-repeated-firing-on-microleakage-of-selective-laser-melting-ceramic-crowns
#11
Qun Zhong, Yan Peng, Xue-Ying Wu, Jia-Wei Weng
PURPOSE: To investigate the effects of repeated firing on microleakage of selective laser melting ceramic crowns. METHODS: Fifty molars were randomly divided into 2 groups (25 teeth in each group). Teeth in group A received a chamfer finish line preparation, whereas teeth in group B received a shoulder finish line. After SLM metal crowns were fabricated, all the crowns received initial oxidation step, opaque firing, dentin firing and glaze firing, then crowns in each group were randomly divided into 5 sub-groups according to different time of clinical firings...
December 2016: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28268713/investigations-on-different-epoxies-for-electrical-insulation-of-microflex-structures
#12
P Cvancara, S Lauser, L Rudmann, T Stieglitz
The microflex interconnection (MFI) technique is often used to connect electrically and mechanically thin film ribbons or electrodes with a solid substrate like screen printed ceramics. For stabilization reasons epoxy is used to fix the MFI structure. As epoxy tends to form cracks when surrounded by water or electrolytes we are eager to find an epoxy which provides sufficient insulation between the single channels of the MFI structure also in a moist surrounding. Therefore we designed a device to investigate the insulating properties of different epoxies (Uhu Plus Endfest 300, Epo-Tek 353ND and 353ND-T) immersed in saline solution...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28267829/success-and-survival-of-various-types-of-all-ceramic-single-crowns-a-critical-review-and-analysis-of-studies-with-a-mean-follow-up-of-5-years-or-longer
#13
Alhanoof Aldegheishem, George Ioannidis, Wael Att, Haralampos Petridis
PURPOSE: The aim of this critical review was to assess the survival and success rates of all-ceramic single crowns manufactured using different ceramic materials with a mean follow-up time of 5 years or longer. MATERIALS AND METHODS: An electronic search of studies published between 1980 and 2014 complemented by manual searching was conducted in Medline and Scopus. The terms ceramic, crown, survival, success, longevity, and complications were selected as keywords...
March 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28262811/a-new-malaria-vector-mosquito-in-south-africa
#14
Ashley Burke, Leonard Dandalo, Givemore Munhenga, Yael Dahan-Moss, Frans Mbokazi, Sifiso Ngxongo, Maureen Coetzee, Lizette Koekemoer, Basil Brooke
South Africa aims to eliminate malaria within its borders by 2018. Despite well-coordinated provincial vector control programmes that are based on indoor residual insecticide spraying, low-level residual malaria transmission continues in the low-altitude border regions of the north-eastern sector of the country. In order to identify the underlying causes of residual transmission, an enhanced vector surveillance system has been implemented at selected sites in the Mpumalanga and KwaZulu-Natal (KZN) provinces...
March 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28262271/the-impact-of-resin-coating-on-sub-critical-crack-extension-in-a-porcelain-laminate-veneer-material
#15
Xu Cao, Garry J P Fleming, Owen Addison
OBJECTIVES: Characterisation of the interaction between crack extension, crack stabilisation and stress/strain relaxation in the polymeric matrix, the interplay between stress corrosion cracking and the mechanical response of a resin-based luting adhesive within a surface defect population could extend PLV restoration longevity by optimising cementation protocols. The aim was to investigate the influence of stress corrosion cracking and the viscoelastic behaviour of a resin-based luting adhesive independently by controlling the environmental conditions operative during test specimen fabrication...
March 2, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28260947/the-effect-of-curing-intensity-on-mechanical-properties-of-different-bulk-fill-composite-resins
#16
Fahad I Alkhudhairy
OBJECTIVE: The purpose of this study was to investigate the effects of two curing light intensities on the mechanical properties (Vickers microhardness, compressive strength, and diametral tensile strength) of bulk-fill resin-based composites (RBCs). MATERIALS AND METHODS: Four commercially available bulk-fill RBCs (Tetric(®) N-Ceram, SonicFill™, Smart Dentin Replacement (SDR™) Posterior Flowable Material, and Filtek™ Posterior Restorative) were used in this study...
2017: Clinical, Cosmetic and Investigational Dentistry
https://www.readbyqxmd.com/read/28258266/effect-of-newly-developed-resin-cements-and-thermocycling-on-the-strength-of-porcelain-laminate-veneers
#17
Fawaz I Alqahtani
AIM: The aim of this study was to determine the effect of different luting cements and accelerated artificial aging (AAA) in the fracture resistance of porcelain laminate veneers (PLVs). MATERIALS AND METHODS: A total of 80 disc-shaped specimens were prepared using computer-aided design/computer-aided milling technology from lithium disilicate glass-ceramic blocks. Specimens (0.5 mm thick, 10 mm diameter) were divided into eight groups of 10 specimens per group...
March 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28254566/a-combined-genetic-algorithm-and-finite-element-method-for-the-determination-of-a-practical-elasto-electric-set-for-1-3-piezocomposite-phases
#18
R Rouffaud, A-C Hladky-Hennion, F Levassort
1-3 piezocomposites are widely used in ultrasonic transducers, particularly for imaging applications. The fabrication process is often based on the dice and fill method, leading to a periodic structure. This process can modify the initial properties of the two phases due to the machining of the piezoelectric bulk ceramic and setting of the polymer. A method is proposed to directly determine a practical set for 1-3 piezocomposite properties and all the elastic, dielectric and piezoelectric parameters of the two piezoelectric (11 constants) and inert phases (3 constants)...
February 20, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28254154/total-hip-arthroplasty-with-step-cut-subtrochanteric-femoral-shortening-osteotomy-in-high-riding-hip-dislocated-patients-with-previous-femoral-osteotomy
#19
Vahit Emre Ozden, Goksel Dikmen, Burak Beksac, Ismail Remzi Tozun
BACKGROUND: To evaluate the long-term clinical and radiological outcomes of cementless total hip arthroplasty (THA) in high riding hip dislocated patients with previous proximal femoral osteotomy. METHODS: Twenty-one consecutive patients with a mean age forty-two years were treated with cementless THA Step-cut subtrochanteric femoral osteotomy was performed in all twenty-eight hips. Metal on polyethylene (MoP) and ceramic on ceramic (CoC) bearings were used in two different consecutive time periods...
February 18, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28252079/abiotic-tooth-enamel
#20
Bongjun Yeom, Trisha Sain, Naida Lacevic, Daria Bukharina, Sang-Ho Cha, Anthony M Waas, Ellen M Arruda, Nicholas A Kotov
Tooth enamel comprises parallel microscale and nanoscale ceramic columns or prisms interlaced with a soft protein matrix. This structural motif is unusually consistent across all species from all geological eras. Such invariability-especially when juxtaposed with the diversity of other tissues-suggests the existence of a functional basis. Here we performed ex vivo replication of enamel-inspired columnar nanocomposites by sequential growth of zinc oxide nanowire carpets followed by layer-by-layer deposition of a polymeric matrix around these...
March 1, 2017: Nature
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