1,721,015 research outputs found
The Influence Of Tubule Density And Area Of Solid Dentin On Bond Strength Of Two Adhesive Systems To Dentin
Full text linkPurpose: To determine the correlation between the tubule density (TD) and the area occupied by solid dentin (ASD) with the bond strength of one conventional and one self-etching adhesive system to dentin. Materials and Methods: The crown of extracted human third molars was transversally sectioned with a diamond saw to expose either superficial, middle, or deep dentin. The three groups of dentin surfaces were randomly divided and bonded with either Clearfil Liner Bond 2V (LB) or Prime & Bond 2.1 (PB) adhesive systems according to manufacturer's directions. Resin composite buildup crowns (10.0 mm high) were incrementally constructed on the bonded surfaces and the teeth stored in water at 37°C. After 24 h of storage, the teeth were vertically, serially sectioned in both x and y directions to obtain several bonded sticks of approximately 0.7 mm2 cross-sectional area. Each stick was tested in tension in a EMIC DL-500 tester at 0.5 mm/min until failure. After testing, the dentin side of the fractured specimen was gently abraded with a 1000-grit SiC paper, etched with 37% phosphoric acid for 15 s and allowed to air dry. SEM micrographs at 1000X and 4000X magnification were taken to permit calculation of the TD (number of tubules/mm2) and ASD (% of total area) at the site of fracture. Correlation between TD and ASD with the bond strength data was performed by linear regression. All statistical analysis was done with a = 0.05. Results: Overall bond strength (MPa) for LB was 26.0 ± 10.2, and 42.6 ± 15.2 for PB. There was a significant direct relationship between bond strength and ASD for both materials (r2 = 0.20, p < 0.05 and r2 = 0.66, p < 0.01, respectively for LB and PB). PB bond strength dropped significantly as the TD increased (r2 = 0.63, p < 0.05), while LB was not sensitive to TD (r2 = 0.05, p > 0.05). Mean bond strength of PB was significantly higher than LB for both superficial and middle dentin (p < 0.05), while there was no significant difference for deep dentin (p > 0.05). Conclusion: Regional variations in TD and ASD may modify bond strength of both conventional and self-etching adhesive systems. Bonding sites with larger ASD seem to yield higher bond strengths regardless of the type of adhesive system used.34315324Burrow, M.F., Takakura, H., Nakajima, M., Inai, N., Tagami, J., Takatsu, T., The influence of age and depth of dentin on bonding (1994) Dent Mater, 10, pp. 241-246Carrigan, P.J., Morse, D.R., Furst, M.L., Sinai, I.H., A scanning electron microscopic evaluation of human dentinal tubules according to age and location (1984) J Endod, 10, pp. 359-363Fernandes, C.A.O., (2000) Estudo Comparativo da Resistência Adesiva À Dentina Superficial e Profunda Testada Simultaneamente, Empregando-se Dois Sistemas Adesivos, , Thesis, Bauru School of Dentistry, USP, Bauru, SP, BrazilFosse, G., Saele, P.K., Eide, R., Numerical density and distributional pattern of dentin tubules (1992) Acta Odont Scand, 50, pp. 201-210Garberoglio, R., Brännström, M., Scanning electron microscopic investigation of human dentinal tubules (1976) Archs Oral Biol, 21, pp. 355-362Gwinnett, A.J., Quantitative contribution of resin infiltration/hybridization to dentin bonding (1993) Am J Dent, 6, pp. 7-9McCabe, J.F., Rusby, S., Dentine bonding agents - Characteristic bond strength as a function of dentine depth (1992) J Dent, 20, pp. 225-230Nakajima, M., Sano, H., Burrow, M.F., Tagami, J., Yoshiyama, M., Ebisu, S., Ciucchi, B., Pashley, D.H., Tensile bond strength and SEM evaluation of caries-effected dentin using adhesives (1995) J Dent Res, 74, pp. 1679-1688Nery, S., McCabe, J.F., Wassell, R.W., A comparative study of three dental adhesives (1995) J Dent, 23, pp. 55-61Pashley, D.H., Carvalho, R.M., Dentine permeability and dentine adhesion (1997) J Dent, 25, pp. 335-372Pashley, D.H., Ciucchi, B., Sano, H., Carvalho, R.M., Russell, C.M., Bond strength versus dentine structure: A modelling approach (1995) Archs Oral Biol, 40, pp. 1109-1118Pashley, D.H., Ciucchi, B., Sano, H., Yoshiyama, M., Carvalho, R.M., Adhesion testing of dentin bonding agents. A review (1995) Dent Mater, 11, pp. 117-125Pashley, D.H., Clinical correlations of dentin structure and function (1991) J Prosth Dent, 66, pp. 777-781Pashley, D.H., Dentin: A dynamic substrate - A review (1989) Scanning Microsc, 3, pp. 161-174Pereira, P.N.R., Okuda, M., Sano, H., Yoshikawa, T., Burrow, M.F., Tagami, J., Effect of intrinsic wetness and regional difference on dentin bond strength (1999) Dent Mater, 15, pp. 46-53Prati, C., Pashley, D.H., Dentin wetness, permeability and thickness and bond strength of adhesive systems (1992) Am J Dent, 5, pp. 33-38Suzuki, T., Finger, W.J., Dentin adhesives: Site of dentin vs. Bonding of composite resins (1988) Dent Mater, 4, pp. 379-383Tagami, J., Tao, L., Pashley, D.H., Correlation among dentin depth, permeability, and bond strength of adhesive resins (1990) Dent Mater, 6, pp. 45-50Tao, L., Pashley, D.H., Shear bond strengths to dentin: Effects of surface treatments, depth and position (1988) Dent Mater, 4, pp. 373-378Tay, F.R., Gwinnett, A.J., Wei, S.H.Y., The overwet phenomenon: A scanning electron microscopic study of surface moisture in the acid-conditioned, resin-dentin interface (1996) Am J Dent, 9, pp. 109-114Tay, F.R., Sano, H., Carvalho, R.M., Pashley, E.L., Pashley, D.H., An ultrastructural study of the influence of acidity of self-etching primers and smear layer thickness on bonding to intact dentin (2000) J Adhesive Dent, 2, pp. 83-98Yoshiyama, M., Carvalho, R.M., Sano, H., Horner, J., Brewer, P.D., Pashley, D.H., Interfacial morphology and strength of bonds made to superficial versus deep dentin (1995) Am J Dent, 8, pp. 297-302Yoshiyama, M., Sano, H., Ebisu, S., Tagami, J., Ciucchi, B., Carvalho, R.M., Johnson, M.H., Pashley, D.H., Regional strengths of bonding agents to cervical sclerotic root dentin (1996) J Dent Res, 75, pp. 1404-141
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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