1,358,489 research outputs found
Effect of modifications of dual acid‐etched implant surfaces on periimplant bone formation. Part II: calcium phosphate coatings
No full textThe aim of the present study was to test the hypothesis that calcium phosphate coatings of dual acid-etched surfaces (DAEs) can improve periimplant bone regeneration. Ten adult female foxhounds received experimental titanium screw implants in the mandible 3 months after removal of all premolar teeth. Five types of surface states were evaluated in each animal: (i) implants with a machined surface (MS) (Control 1); (ii) implants with a DAE (Control 2); (iii) implants with a DAE coated with collagen I (Control 3); (iv) implants with a DAE with mineralized collagen I; and (v) implants with a DAE with a hydroxylapatite (HA) coating. Periimplant bone regeneration was assessed by histomorphometry after 1 and 3 months in five dogs each by measuring bone implant contact (BIC) and the volume density of the newly formed periimplant bone (BVD). After 1 month, mean BIC of experimental implants did not differ significantly from implants with DAE and collagen-coated surfaces, but was significantly higher than the MS implants. BVD was enhanced significantly only in implants with mineralized collagen coating compared with DAE and collagen-coated controls. After 3 months, the mean values of BIC had increased significantly in the group of implants with HA and mineralized collagen coating but were not significantly different from implants with DAE and collagen-coated surfaces. The same held true for the mean BVD values. In conclusion, the present study could not verify the hypothesis that calcium phosphate coatings of DAEs in the present form enhanced periimplant bone formation compared with the DAE surface alone. To cite this article:Schliephake H, Aref A, Scharnweber D, Ro ss ler S, Sewing A. Effect of modifications of dual acid-etched implant surfaces on periimplant bone formation: part II. Calcium phosphate coatings.Clin. Oral Impl. Res. 20, 2009; 38-44.German Federal Ministry of Education and Research BMBF [03N4021
Effect of modifications of dual acid‐etched implant surfaces on peri‐implant bone formation. Part I: organic coatings
No full textThe aim of the present study was to test the hypothesis that peri-implant bone formation can be improved by modifying dual acid-etched (DAE) implant surfaces using organic coatings that enhance cell adhesion and osteogenic differentiation. Ten adult female foxhounds received experimental titanium implants in the mandible 3 months after removal of all premolar teeth. Six types of implants were evaluated in each animal: (i) implants with a machined surface (MS), (ii) implants with a DAE surface topography, (iii) implants with an acid-etched surface coated with RGD peptides, (iv) implants with an acid-etched surface coated with collagen I, (v) implants with an acid-etched surface coated with collagen I and chondroitin sulphate (CS), (vi) implants with an acid-etched surface coated with collagen I and CS and recombinant human bone morphogenetic protein-2. Peri-implant bone regeneration was assessed by histomorphometry after 1 and 3 months in five dogs each by measuring bone implant contact (BIC) and the bone volume density (BVD) of the newly formed peri-implant bone. After 1 month, mean BIC was significantly higher in the coated implants group than in the MS group. There was no significant difference when mean BIC in the DAE group was compared with implants with any of the organic coatings, but the difference was significant when compared with the MS implants. Differences in mean BVD value did not reach significance between any of the surfaces. After 3 months, the same held true for the mean BIC of all the groups except for Coll I. Mean volume density of the newly formed bone was higher in all the surface modifications, albeit without statistical significance. It is concluded that with the exception of Coll I, the tested organic surface coatings on DAE surfaces did not improve peri-implant bone formation when compared with the DAE surfaces but enhanced BIC when compared with the MSs. To cite this article:Schliephake H, Aref A, Scharnweber D, Bierbaum S, Sewing A. Effect of modifications of dual acid-etched implant surfaces on peri-implant bone formation. Part I: Organic coatings.Clin. Oral Impl. Res. 20, 2009; 31-37.BMBF [03N4021
Hassan Aref Named Dean Of Engineering At Virginia Tech
No full textHassan Aref, a professor and head of the Theoretical and Applied Mechanics Department at the University of Illinois at Urbana-Champaign will assume the deanship of Virginia Tech's College of Engineering on April 1
AREF 2016 – A quelles questions cherchons-nous réponse ?
No full textTous les trois ans, les associations française, belge et suisse de recherche en éducation (AECSE, ABC-Educ et SSRE) organisent un congrès international d’Actualité de la Recherche en Éducation et en Formation (AREF). La quatrième édition de ce congrès se tiendra à Mons (Belgique) du 4 au 7 juillet 2016. Le congrès AREF est d’abord l’occasion de présenter les travaux de recherche récents et en cours au sein de multiples symposiums abordant des thèmes variés. Mais il est aussi l’occasion d’app..
Stylistic Feature of Aref Chahabi’s Lyric Poetry
No full textThe current study aims to investigate the linguistic, rhetorical, and ideological aspects of Aref Chahabi's lyric poetry in order to determine its stylistic features. The goal is to pinpoint the most important tactics used to mould the style inside these levels. Aref has creatively used English sounds in the phonetic layer to create musical proportions that are relevant to poetry themes. Aref has also thoughtfully created a unified environment and area to effectively communicate the material through the repetition of vowels and consonants. The person has used a linguistic vocabulary in the lexicon layer, which is primarily made up of identical, frequently occurring terms that are objective in character. With the help of this lexicon's useful correlations with certain meanings and senses, a variety of events and places can be vividly portrayed. Aref's lyric poems hemistiches and verses exhibit a variety of syntactic forms. Generally speaking, the verb comes before other elements of the phrase. This feature of his lyric poetry can be recognized as an important grammatical feature. The poet uses a lot of verbs in the informative mode, which suggests that he is examining his ideas with determination and assertiveness. Sentences with a high percentage of active grammatical voice convey energy, vigour, and a proactive attitude towards being creative and productive in society.
The writer has utilized rhetorical devices such as figures of speech and metaphors to create striking poetic imagery, bolster the persuasiveness of their arguments, and elicit dramatic situations within their discourse. The author's lyric poems display a wealth of creative and metaphorical phrases that work to communicate the author's higher concepts and ideas, the visual attractiveness of their perspective, and the sophisticated quality of their imagination as they explore the world of meanings and experiences
Resonance frequency measurements of implant stability in the dog mandible: experimental comparison with histomorphometric data
No full textThe aim of the present study was to test the hypothesis that measurements of implant stability using resonance frequency analysis (RFA) correlate with histomorphometric data of bone anchorage. Ten adult female foxhounds received a total of 80 implants in their mandibles 3 months after removal of all premolar teeth. At the time of implant placement, torque required for bone tapping was registered as a measure of bone density and immediately after placement implant stability was assessed using RFA. RFA measurements were repeated at the time of implant retrieval after 1 month (5 dogs) and 3 months (5 dogs). Peri-implant bone regeneration was assessed histomorphometrically by measuring bone-implant contact (BIC) and the volume density of the newly formed peri-implant bone (BVD). RFA values at the time of implant placement did not correlate with the torque required to tap the bone for implant placement. After 1 and 3 months, RFA values were significantly increased compared with baseline values. BIC and BVD, however. had increased significantly during this interval. There was no correlation between bone-implant contact and RFA values nor between peri-implant bone density and RFA values. Thus, the hypothesis could not be verified. It is concluded that the validity of the individual measurement of implant stability using RFA should be considered with caution
Symposium - Education et santé AREF 2010
No full textSymposium - Education et santé AREF 2010 Chers collègues, A l’occasion du congrès international de l’AREF qui se déroule à Genève du 13 au 16 septembre 2010, nous avons le plaisir de vous annoncer l’organisation de quatre symposiums autour des questions d’éducation et de santé les 14 et 15 septembre prochain. Formations et pratiques, Méthodes et épistémologies, Outils et évaluations, Représentations des acteurs, seront les quatre thématiques abordées, par le biais d’approches sociologiques,..
Illegality of maritime contracts breaching SOLAS/ISPS Code maritime security legislation
No full textThis article discusses basic principles of contract law in relation to the ever-expanding area of maritime security law. Specifically, it tries to answer the question whether breach of maritime security legislation contained in the International Convention for the Safety of Life at Sea, 1974, as amended (SOLAS), or the International Ship and Port Facility Security Code (ISPS Code) could lead, in addition to criminal or administrative sanctions, to contracts for the operation of the vessel, such as contracts of carriage and towage, being denied enforceability in a court of law
Datalog for Enterprise Software: from Industrial Applications to Research (Invited Talk)
No full textLogicBlox is a platform for the rapid development of enterprise applications in the domains of decision automation, analytics, and planning. Although the LogicBlox platform embodies several components and technology decisions (e.g., an emphasis on software-as- a-service), the key substrate and glue is an implementation of the Datalog language. All application development on the LogicBlox platform is done declaratively in Datalog: The language is used to query large data sets, but also to develop web and desktop GUIs (with the help of pre-defined libraries), to interface with solvers, statistics tools, and optimizers for complex analytics solutions, and to express the overall business logic of the application.
The goal of this talk is to present both the business case for Datalog and the fruitful interaction of research and industrial applications in the LogicBlox context
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