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https://www.readbyqxmd.com/read/29782585/exploring-transformations-in-caribbean-indigenous-social-networks-through-visibility-studies-the-case-of-late-pre-colonial-landscapes-in-east-guadeloupe-french-west-indies
#1
Tom Brughmans, Maaike S de Waal, Corinne L Hofman, Ulrik Brandes
This paper presents a study of the visual properties of natural and Amerindian cultural landscapes in late pre-colonial East-Guadeloupe and of how these visual properties affected social interactions. Through a review of descriptive and formal visibility studies in Caribbean archaeology, it reveals that the ability of visual properties to affect past human behaviour is frequently evoked but the more complex of these hypotheses are rarely studied formally. To explore such complex hypotheses, the current study applies a range of techniques: total viewsheds, cumulative viewsheds, visual neighbourhood configurations and visibility networks...
2018: Journal of archaeological method and theory
https://www.readbyqxmd.com/read/29781248/the-role-of-3d-printing-in-treating-craniomaxillofacial-congenital-anomalies
#2
REVIEW
Christopher D Lopez, Lukasz Witek, Andrea Torroni, Roberto L Flores, David B Demissie, Simon Young, Bruce N Cronstein, Paulo G Coelho
Craniomaxillofacial congenital anomalies comprise approximately one third of all congenital birth defects and include deformities such as alveolar clefts, craniosynostosis, and microtia. Current surgical treatments commonly require the use of autogenous graft material which are difficult to shape, limited in supply, associated with donor site morbidity and cannot grow with a maturing skeleton. Our group has demonstrated that 3D printed bio-ceramic scaffolds can generate vascularized bone within large, critical-sized defects (defects too large to heal spontaneously) of the craniomaxillofacial skeleton...
May 20, 2018: Birth Defects Research
https://www.readbyqxmd.com/read/29777736/edge-strength-of-cad-cam-materials
#3
Maria Pfeilschifter, Verena Preis, Michael Behr, Martin Rosentritt
OBJECTIVES: To investigate the edge force of CAD/CAM materials as a function of (a) material, (b) thickness, and (c) distance from the margin. METHODS: Materials intended for processing with CAD/CAM were investigated: eight resin composites, one resin-infiltrated ceramic, and a clinically proven lithiumdisilicate ceramic (reference). To measure edge force (that is, load to failure/crack), plates (d = 1 mm) were fixed and loaded with a Vickers diamond indenter (1 mm/min, Zwick 1446) at a distance of 0...
May 16, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29777311/sufficiency-of-curing-in-high-viscosity-bulk-fill-resin-composites-with-enhanced-opacity
#4
Nicoleta Ilie
OBJECTIVES: The study aims analyzing if improved opacity in modern high-viscosity bulk-fill resin composites (BF-RBC) contradicts with the sufficiency of curing and to assess material's tolerance to less ideal curing conditions. MATERIALS AND METHODS: Simulated large cavities (10 × 6) mm were filled in one increment with three BF-RBCs (Filtek One, FO; Tetric Evo Ceram Bulk Fill, TEC-BF; SonicFill2, SF2). One central and two peripheral (4 mm apart from the center) micromechanical property line-profiles (HV, Vickers hardness; YHU , indentation modulus) were measured in 0...
May 18, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29777094/biological-monitoring-and-lung-function-assessment-among-workers-exposed-to-chromium-in-the-ceramic-industry
#5
Fatemeh Kargar Shouroki, Seyed Jamaleddin Shahtaheri, Farideh Golbabaei, Abolfazle Barkhordari, Abbas Rahimi-Froushani
BACKGROUND: Chromium exposure occurs in various industries such as ceramics industry. The main disadvantage of chromium is high toxicity when absorbed by the body. This study aimed to determine and compare urinary chromium values in the pre- and post-shift of ceramic glazers and the control group; investigate urinary chromium value according to the study variables; compare pulmonary function tests between ceramic glazers vs. the control group. STUDY DESIGN: A cross-sectional study...
March 19, 2018: Journal of Research in Health Sciences
https://www.readbyqxmd.com/read/29775274/oxide-based-composite-electrolytes-using-na3zr2si2po12-na3ps4-interfacial-ion-transfer
#6
Kousuke Noi, Yuka Nagata, Takashi Hakari, Kenji Suzuki, So Yubuchi, Yusuke Ito, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago
All-solid-state sodium batteries using Na3Zr2Si2PO12 (NASICON) solid electrolytes are promising candidates for safe and low-cost advanced rechargeable battery systems. Although NASICON electrolytes have intrinsically high sodium ion conductivities, their high sintering temperatures interfere with the immediate development of high-performance batteries. In this work, sintering-free NASICON-based composites with Na3PS4 (NPS) glass-ceramics were prepared to combine the high grain-bulk conductivity of NASICON and the interfacial formation ability of NPS...
May 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29770877/polishing-effects-and-wear-performance-of-chairside-cad-cam-materials
#7
Mike Matzinger, Sebastian Hahnel, Verena Preis, Martin Rosentritt
OBJECTIVES: To investigate the surface roughness of CAD/CAM materials immediately after milling and after different chairside and labside polishing procedures. A two-body wear test was performed to compare the different wear characteristics of the materials and the corresponding antagonists. MATERIALS AND METHODS: Specimens (n = 12 per series) from different CAD/CAM materials (three composites: Lava Ultimate, Cerasmart, BRILLIANT Crios; one hybrid ceramic: VITA Enamic; three ceramics: Celtra Duo, VITA Suprinity, IPS Emax...
May 16, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29770696/structural-characterization-of-b-site-ordered-ba-2-ln-2-3-teo-6-ln-la-pr-nd-sm-and-eu-double-perovskites-and-probing-its-luminescence-as-eu-3-phosphor-hosts
#8
Sariga C Lal, Vidhya Lalan, Subodh Ganesanpotti
Ba2 Ln2/3 TeO6 (Ln = La, Pr, Nd, Sm, and Eu) double perovskites were synthesized via solid-state ceramic route. Preliminary X-ray diffraction studies indicated a pseudocubic structure with lattice parameters ranging from 8.55 to 8.44 Å for the substitution of rare earths from La to Eu. Raman spectra show the frequency dependence of various Raman bands with respect to rare-earth substitution and exhibit a significant shift in peaks to higher wavenumber region, which was observed only for symmetric stretching modes of LnO6 and TeO6 octahedra...
May 17, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29766760/osteoinduction-by-ex-vivo-bone-morphogenetic-protein-gene-delivery-is-independent-of-cell-type
#9
Loek Loozen, Moyo C Kruyt, Angela Vandersteen, Angela H M Kragten, Michiel Croes, F Cumhur Oner, Jacqueline Alblas
Ex vivo non-viral gene delivery of bone-inductive factors has the potential to heal bone defects. Due to their inherent role in new bone formation, multipotent stromal cells (MSCs) have been studied as the primary target cell for gene delivery in a preclinical setting. The relative contribution of autocrine and paracrine mechanisms, and the need of osteogenic cells, remains unclear. This study investigates the contribution of MSCs as producer of transgenic BMPs and to what extent the seeded MSCs participate in actual osteogenesis...
May 16, 2018: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29765979/influence-of-material-selection-on-the-marginal-accuracy-of-cad-cam-fabricated-metal-and-all-ceramic-single-crown-copings
#10
Matthias Rödiger, Lea Schneider, Sven Rinke
This study evaluated the marginal accuracy of CAD/CAM-fabricated crown copings from four different materials within the same processing route. Twenty stone replicas of a metallic master die (prepared upper premolar) were scanned and divided into two groups. Group 1 ( n = 10) was used for a pilot test to determine the design parameters for best marginal accuracy. Group 2 ( n = 10) was used to fabricate 10 specimens from the following materials with one identical CAD/CAM system (GAMMA 202, Wissner GmbH, Goettingen, Germany): A = commercially pure (cp) titanium, B = cobalt-chromium alloy, C = yttria-stabilized zirconia (YSZ), and D = leucite-reinforced glass-ceramics...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29763497/additively-manufactured-titanium-and-cobalt-chromium-implant-frameworks-fit-and-effect-of-ceramic-veneering
#11
Per Svanborg, Alf Eliasson, Victoria Stenport
PURPOSE: The purpose of this study was to evaluate the fit of additively manufactured cobalt-chromium and titanium and CNC-milled titanium frameworks before and after ceramic veneering. MATERIALS AND METHODS: Ten stone casts simulating an edentulous maxilla provided with six abutment analogs were produced. For each stone cast, one additively manufactured cobalt-chromium framework (AM CoCr) and one titanium framework (AM Ti) were fabricated. The fit was analyzed with a coordinate measuring machine in three dimensions (x, y, and z axes) using best-fit virtual matching of center point coordinates, before and after ceramic veneering...
May 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29757470/sinus-augmentation-using-rhbmp-2-acs-in-a-mini-pig-model-influence-of-an-adjunctive-ceramic-bone-biomaterial
#12
Cristiano Susin, Jaebum Lee, Tiago Fiorini, Rubens Moreno de Freitas, Hsien-Chung Chiu, Hari S Prasad, Amanda N Buxton, Ulf Me Wikesjö
BACKGROUND: Recombinant human bone morphogenetic protein-2 in an absorbable collagen sponge carrier (rhBMP-2/ACS) has been shown to support significant bone formation when used to augment the maxillary sinus for implant dentistry. Nevertheless, bone biomaterials have been suggested to extend rhBMP-2/ACS with limited support of the merits of such approaches. OBJECTIVES: To evaluate local bone formation/dental implant osseointegration following implantation of rhBMP-2/ACS combined with a ceramic bone biomaterial using a mini-pig sinus augmentation model...
May 14, 2018: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/29756242/novel-materials-for-3d-printing-by-photopolymerization
#13
Michael Layani, Xiaofeng Wang, Shlomo Magdassi
The field of 3D printing, also known as additive manufacturing (AM), is developing rapidly in both academic and industrial research environments. New materials and printing technologies, which enable rapid and multimaterial printing, have given rise to new applications and utilizations. However, the main bottleneck for achieving many more applications is the lack of materials with new physical properties. Here, some of the recent reports on novel materials in this field, such as ceramics, glass, shape-memory polymers, and electronics, are reviewed...
May 13, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29754980/implant-survival-and-patient-reported-outcomes-after-total-hip-arthroplasty-in-young-patients
#14
Ishaan Swarup, Yuo-Yu Lee, Yu-Fen Chiu, Ryan Sutherland, Marisa Shields, Mark P Figgie
BACKGROUND: Younger patients are undergoing total hip arthroplasty (THA) for various conditions that affect the hip joint. This study evaluates the implant survival and long-term patient-reported outcomes of THA in patients aged 35 years or younger. METHODS: Data were collected through a retrospective chart review, and follow-up surveys were conducted to determine implant survival and patient-reported outcomes. Kaplan-Meier survival analysis was performed to evaluate implant survival, and the hip disability and osteoarthritis outcome score (HOOS) was used to describe patient-reported outcomes...
April 19, 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29750327/do-nano-crystalline-silver-coated-hernia-grafts-reduce-infection
#15
Elif Nergiz Adıgüzel, Ebru Esen, Gökçe Aylaz, Betül Keskinkılıç Yağız, Mehmet Kıyan, Aydın Doğan, Ali Ekrem Ünal
PURPOSE: Inguinal hernia repairs are the most common interventions in adults in general surgery clinics. Depending on the type of mesh and repair, the incidence of mesh-related infection ranges from 0.6 to 8%. Methicillin-resistant Staphylococcus aureus is the most common microorganism causing graft infection. The aim of this study was to investigate the efficacy of nano-crystalline silver-coated polypropylene grafts against graft infection created with MRSA in rats. METHODS: A total of 60 female, Wistar albino rats were used in the study...
May 10, 2018: World Journal of Surgery
https://www.readbyqxmd.com/read/29750098/effect-of-surface-treatments-with-acid-solutions-on-the-surface-roughness-of-an-yttrium-tetragonal-zirconia-polycrystal
#16
Frederico Goyatá, Yvna Galvão, Thamyryz-Rafaela Simões, Luiz-Felipe Goyatá, José-Alcides Arruda, Amália Moreno
Background: The purpose of this in vitro study was to evaluate the effect of conventional surface treatment with acid solutions on the surface roughness of a zirconia-based ceramic. Material and Methods: Specimens of yttrium-tetragonal zirconia polycrystal (Y-TZP) -based ceramic were fabricated (5.0 x 5.0 x 2.0 mm, n=40). The specimens were submitted to the tested surface treatment method and divided into 4 groups (n=10): no treatment-control (GI), airborne 110 µm aluminum oxide particle abrasion for 1 minute-conventional method (GII); etching with 48% hydrofluoric acid for 2 minutes (GIII), and nitric acid/hydrofluoric acid etching for 2 minutes (GIV)...
April 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29744927/the-effect-of-bearing-friction-torques-on-the-primary-stability-of-press-fit-acetabular-cups-a-novel-in-vitro-method
#17
Jahnke Alexander, Schroeder Stefan, Fonseca Ulloa Carlos Alfonso, Ahmed Gafar Adam, Ishaque Bernd Alexander, Rickert Markus
Aseptic loosening is the main reason for revision of total hip arthroplasty, and relative micromotions between cementless acetabular cups and bone play an important role regarding their comparatively high loosening rate. Therefore, the aim of the present study was to analyze the influence of resulting frictional torques on the primary stability of press-fit acetabular cups subjected to two different bearing partners. A cementless press-fit cup was implanted in bone-like foam. Primary stability of the cup was analyzed by determining spatial total, translational and rotational interface micromotions by means of an eddy current sensor measuring system...
May 10, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29743690/highly-durable-coking-and-sulfur-tolerant-fuel-flexible-protonic-ceramic-fuel-cells
#18
Chuancheng Duan, Robert J Kee, Huayang Zhu, Canan Karakaya, Yachao Chen, Sandrine Ricote, Angelique Jarry, Ethan J Crumlin, David Hook, Robert Braun, Neal P Sullivan, Ryan O'Hayre
Protonic ceramic fuel cells, like their higher-temperature solid-oxide fuel cell counterparts, can directly use both hydrogen and hydrocarbon fuels to produce electricity at potentially more than 50 per cent efficiency1,2 . Most previous direct-hydrocarbon fuel cell research has focused on solid-oxide fuel cells based on oxygen-ion-conducting electrolytes, but carbon deposition (coking) and sulfur poisoning typically occur when such fuel cells are directly operated on hydrocarbon- and/or sulfur-containing fuels, resulting in severe performance degradation over time3-6 ...
May 2018: Nature
https://www.readbyqxmd.com/read/29742254/effects-of-three-silane-primers-and-five-adhesive-agents-on-the-bond-strength-of-composite-material-for-a-computer-aided-design-and-manufacturing-system
#19
Ayano Shinohara, Yohsuke Taira, Michino Sakihara, Takashi Sawase
Objective The objective of this study was to evaluate the effects of combinations of silane primers and adhesive agents on the bond strength of a composite block for a computer-aided design and manufacturing system. Material and Methods Three silane primers [Clearfil Ceramic Primer (CP), Super-Bond PZ Primer (PZ), and GC Ceramic Primer II (GP)] were used in conjunction with five adhesive agents [G-Premio Bond (P-Bond), Repair Adhe Adhesive (R-Adhesive), Super-Bond D-Liner Dual (SB-Dual), Super-Bond C&B (SB-Self), and SB-Dual without tributylborane derivative (SB-Light)]...
2018: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29738600/adapter-sleeves-are-not-needed-to-reduce-the-risk-of-fracture-of-a-new-ceramic-head-implanted-on-a-well-fixed-stem
#20
Young-Hoo Kim, Jang-Won Park, Jun-Shik Kim
The purpose of this study was to assess (1) the prevalence of the fracture of ceramic heads implanted on used trunnions of well-fixed stems without using a titanium adapter sleeve; (2) the prevalence of trunnionosis secondary to fretting and/or corrosion at the trunnion of the well-fixed stem; and (3) clinical and radiographic results and the survival rate of the revised acetabular components. Eighty-eight patients (100 hips) underwent isolated revision of the acetabular components for polyethylene wear and osteolysis of the acetabulum...
May 8, 2018: Orthopedics
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