1,721,048 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
Effect Of Water Storage On Bond Strength Of Self-etching Adhesives To Dentin
No full textAim: The objective of this study was to evaluate the bond strength of self-etching adhesive systems one week and one year after storage in water. Methods and Materials: Fragments from the buccal surfaces of 45 bovine teeth were prepared (12 mm in length X 5 mm in width X 1.0 mm in thickness). Dentin surfaces were wet-abraded with 600-grit SiC paper to create a standardized smear layer. Samples were randomly assigned to 18 experimental groups (n=5), according to nine adhesive systems tested (Single Bond; Adper Prompt L-Pop; iBond; One-Up Bond F; Xeno III; Clearfil SE Bond; Optibond Solo Plus SE; Tyrian SPE/One-Step Plus; and UniFil Bond) and two waterstorage times (one week and one year). Adhesives were applied according to the manufacturers' instructions. Z250 composite was applied into the molds to fill up the internal diameter volume of a Tygon tubing mold (1.0 mm high/0.7 mm internal diameter). Micro-shear bond strengths were determined using an apparatus attached to an Instron Universal Testing Machine (0.5 mm/min). Data were statistically analyzed using a twoway analysis of variance (ANOVA) and the Tukey's test (5%). Results: One year after water storage the dentin bond strength of all adhesive systems reduced significantly, except for One-Up Bond F. Conclusion: Water-storage time decreased the bond strength for most dentin bonding agents tested.874653Chigira, H., Yukitani, W., Hasegawa, T., Manabe, A., Itoh, K., Hayakawa, T., Debari, K., Hisamitsu, H., Self-etching dentin primers containing Phenyl-P (1994) J Dent Res, 73, pp. 1088-1095Watanabe, I., Nakabayashi, N., Pashley, D.H., Bonding to ground dentin by a phenyl-P self-etching primer (1994) J Dent Res, 73, pp. 1212-1220Eliades, G.C., Caputo, A.A., Vougiouklakis, G.J., Composition, wetting properties and bond strength with dentin of 6 new dentin adhesives (1985) Dent Mater, 1, pp. 170-176Burke, F.J.T., McCaughey, A.D., The four generations of dentin bonding (1995) Am J Dent, 8, pp. 88-92Eick, J.D., Gwinnett, A.J., Pashley, D.H., Robinson, S.J., Current concepts on adhesion to dentin (1997) Crit Rev Oral Biol Med, 8, pp. 306-335Nakabayashi, N., Pashley, D.H., (1998) Hybridization of dental hard tissues, , 1st ed. Tokyo, Quintessence Publishing Co;Van Meerbeek, B., De Munck, J., Yoshida, Y., Inoue, S., Vargas, M., Vijay, P., Van Landuyt, K., Vanherle, G., Adhesion to enamel and dentin: Currents status and future challenges (2003) Oper Dent, 28, pp. 215-235De Munck, J., Van Landuyt, K., Peumans, M., Poitevin, A., Lambrechts, P., Braem, M., Van Meerbeek, B., A critical review of the durability of adhesion to tooth tissue: Methods and results (2005) J Dent Res, 84, pp. 118-132Tay, F.R., Pashley, D.H., King, N.M., Carvalho, R.M., Tsai, J., Lai, S.C., Marquezini Jr, L., Agressiveness of self-etch adhesives on unground enamel (2004) Oper Dent, 29, pp. 309-316Tay, F.R., Pashley, D.H., Suh, B.I., Carvalho, R.M., Itthagarun, A., Single-step adhesives are permeable membranes (2002) J Dent, 30, pp. 371-382Tay, F., Pashley, D.H., Have dentin adhesives become too hydrophilic? (2003) J Can Dent Assoc, 69, pp. 726-731Tay, F.R., Sano, H., Carvalho, R.M., 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 Adhes Dent, 2, pp. 83-98Tay, F.R., Pashley, D.H., Aggressiveness of contemporary self-etching systems. I: Depth of penetration beyond dentin smear layers (2001) Dent Mater, 17, pp. 296-308Yiu, C.K., King, N.M., Pashley, D.H., Suh, B.I., Carvalho, R.M., Carrilho, M.R., Tay, F.R., Effect of resin hydrophilicity and water storage on resin strength (2004) Biomaterials, 25, pp. 5789-5796Van Landuyt, K.L., De Munck, J., Snauwaert, J., Coutinho, E., Poitevin, A., Yoshida, Y., Inoue, S., Van Meerbeek, B., Monomer solvent phase separation in one-step self-etch adhesives (2005) J Dent Res, 84, pp. 183-188Swift Jr, E.F., Dentin/enamel adhesives: Review of the literature (2002) Pediatr Dent, 24, pp. 456-461Reis, A.F., Oliveira, M.T., Giannini, M., De Goes, M.F., Rueggeberg, F.A., The effect of organic solvents on one-bottle adhesives bond strength to enamel and dentin (2003) Oper Dent, 28, pp. 689-694Shimada, Y., Yamaguchi, S., Tagami, J., Micro-shear bond strength of dual-cured resin cement to glass ceramics (2002) Dent Mat, 8, pp. 380-388Sano, H., Yoshikawa, T., Pereira, P.N., Kanemura, N., Morigami, M., Tagami, J., Pashley, D.H., Long-term durability of dentin bonds made with a self-etching primer, in vivo (1999) J Dent Res, 78, pp. 906-911Hashimoto, M., Ohno, H., Kaga, M., Endo, K., Sano, H., Oguchi, H., In vivo degradation of resin dentin bonds in human over 1 to 3 years (2000) J Dent Res, 79, pp. 1385-1391Giannini, M., Seixas, C.A.M., Reis, A.F., Pimenta, L.A.F., Six-month storage-time evaluation of one-bottle adhesive systems to dentin (2003) J Esthet Restor Dent, 15, pp. 43-48Reis, A.F., Arrais, C.A.G., Novaes, P.D., Carvalho, R.M., De Goes, M.F., Giannini, M., Ultramorphological analysis of resin-dentin interfaces produced with water-based single-step and two-step adhesives: Nanoleakage expression (2004) J Biomed Mater Res, 71 (B), pp. 90-98Carvalho, R.M., Tay, F.R., Giannini, M., Pashley, D.H., Effects of pre- and post-bonding hydration on bond strength to dentin (2004) J Adhes Dent, 6, pp. 13-17Pashley, E.L., Zhang, Y., Lockwood, P.E., Rueggeberg, F.A., Pashley, D.H., Effects of HEMA on water evaporation from water-HEMA mixtures (1998) Dent Mater, 14, pp. 6-10Pashley, D.H., Carvalho, R.M., Tay, F.R., Agee, K.A., Lee, K.-W., Solvation of dried matrix by water and other polar solvents (2002) Am J Dent, 15, pp. 97-102Burrow, M.F., Inokoshi, S., Tagami, J., Water sorption of several bonding resins (1999) Am J Dent, 12, pp. 295-298Ferrari, M., Tay, F.R., Technique sensitivity in bonding to vital, acid-etched dentin (2003) Oper Dent, 28, pp. 3-8Tay, F.R., Hashimoto, M., Pashley, D.H., Peters, M.C., Lai, S.C., Yiu, C.K., Cheong, C., Aging affects two modes of nanoleakage expression in bonded dentin (2003) J Dent Res, 82, pp. 537-541Tanaka, J., Ishikawa, K., Yatani, H., Yamashita, A., Suzuki, K., Correlation of dentin bond durability with water absorption of bonding layer (1999) Dent Mater J, 18, pp. 11-18Mortier, E., Gerdolle, D.A., Jacquot, B., Panighi, M.M., Importance of water sorption and solubility studies for couple bonding agent/resin-based filling material (2004) Oper Dent, 29, pp. 669-676Chersoni, S., Suppa, P., Grandini, S., Goracci, C., Monticelli, F., Yiu, C., Huang, C., Tay, F.R., In vivo and in vitro permeability of One-step self-etch adhesives (2004) J Dent Res, 83, pp. 459-464Vargas, M.A., Cobb, D.S., Denehy, G.E., Interfacial micromorphology and shear bond strength of singlebottle primer/adhesives (1997) Dent Mater, 13, pp. 316-324Nakamichi, I., Iwaku, M., Fusayama, T., Bovine teeth as possible human teeth substitutes (1983) J Dent Res, 62, pp. 1076-1081Reis, A.F., Giannini, M., Kavaguchi, A., Line, S.R.P., Comparision of microtensile bond strength of human, bovine and porcine teeth (2004) J Adhes Dent, 6, pp. 117-12
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
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