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Corrosion Kinetics And Topography Analysis Of Ti-6al-4v Alloy Subjected To Different Mouthwash Solutions
No full textThis study evaluated the corrosion kinetics and surface topography of Ti-6Al-4V alloy exposed to mouthwash solutions (0.12% chlorhexidine digluconate, 0.053% cetylpyridinium chloride and 3% hydrogen peroxide) compared to artificial saliva (pH 6.5) (control). Twenty Ti-6Al-4V alloy disks were used and divided into 4 groups (n = 5). For the electrochemical assay, standard tests as open circuit potential and electrochemical impedance spectroscopy (EIS) were applied at baseline, 7 and 14 days after immersion in the solutions. Scanning electron microscopy, atomic force microscopy and profilometry (average roughness - Ra) were used for surface characterization. Total weight loss of disks was calculated. Data were analyzed by ANOVA and Bonferroni's test (α = 0.05). Hydrogen peroxide generated the lowest polarization resistance (R p) values for all periods (P < 0.05). For the capacitance (C dl), similar results were observed among groups at baseline (P = 0.098). For the 7 and 14-day periods, hydrogen peroxide promoted the highest Cdl values (P < 0.0001). Hydrogen peroxide promoted expressive superficial changes and greater Ra values than the others (P < 0.0001). It could be concluded that solutions containing cetylpyridinium chloride and chlorhexidine digluconate might be the mouthwashes of choice during the post-operatory period of dental implants. However, hydrogen peroxide is counter-indicated in these situations. Further studies evaluating the dynamics of these solutions (tribocorrosion) and immersing the disks in daily cycles (two or three times a day) to mimic a clinical situation closest to the application of mouthwashes in the oral cavity are warranted to prove our results. © 2014 Elsevier B.V.43110Ivanoff, C.J., Hallgren, C., Widmark, G., Sennerby, L., Wennerberg, A., (2001) Clin. Oral Implants Res., 12, pp. 128-134Barao, V.A., Mathew, M.T., Assuncao, W.G., Yuan, J.C., Wimmer, M.A., Sukotjo, C., (2012) Clin. Oral Implants Res., 23, pp. 1055-1062Branemark, P.I., Hansson, B.O., Adell, R., Breine, U., Lindstrom, J., Hallen, O., Ohman, A., (1977) Scand. J. Plast. Reconstr. Surg. Suppl., 16, pp. 1-132Cortada, M., Giner, L., Costa, S., Gil, F.J., Rodriguez, D., Planell, J.A., (2000) J. Mater. Sci. Mater. Med., 11, pp. 287-293Schiff, N., Grosgogeat, B., Lissac, M., Dalard, F., (2002) Biomaterials, 23, pp. 1995-2002Barao, V.A., Mathew, M.T., Assuncao, W.G., Yuan, J.C., Wimmer, M.A., Sukotjo, C., (2011) J. Dent. Res., 90, pp. 613-618Faverani, L.P., Barao, V.A., Ramalho-Ferreira, G., Ferreira, M.B., Garcia-Junior, I.R., Assuncao, W.G., (2014) J. Biomed. Mater. Res. B Appl. Biomater., 102, pp. 22-30Nikolopoulou, F., Saliva and dental implants (2006) Implant Dent., 15, pp. 372-376Mareci, D., Chelariu, R., Dan, I., Gordin, D.M., Gloriant, T., (2010) J. Mater. Sci. Mater. Med., 21, pp. 2907-2913Correa, C.B., Pires, J.R., Fernandes-Filho, R.B., Sartori, R., Vaz, L.G., (2009) J. Prosthodont., 18, pp. 382-387De Waal, Y.C., Raghoebar, G.M., Huddleston Slater, J.J., Meijer, H.J., Winkel, E.G., Van Winkelhoff, A.J., (2013) J. Clin. Periodontol., 40, pp. 186-195Schwarz, F., Bieling, K., Bonsmann, M., Latz, T., Becker, J., (2006) Clin. Oral Investig., 10, pp. 279-288Abu-Ta'A, M., Quirynen, M., Teughels, W., Van Steenberghe, D., (2008) J. Clin. Periodontol., 35, pp. 58-63Roos-Jansaker, A.M., Renvert, S., Egelberg, J., (2003) J. Clin. Periodontol., 30, pp. 467-485Gunsolley, J.C., (2010) J. Dent., 38 (SUPPL. 1), pp. 6-S10Gunsolley, J.C., (2006) J. Am. Dent. Assoc., 137, pp. 1649-1657Pizzo, G., Guiglia, R., Imburgia, M., Pizzo, I., D'Angelo, M., Giuliana, G., (2006) J. Periodontol., 77, pp. 248-256Quaranta, A., Ronconi, L.F., Di Carlo, F., Vozza, I., Quaranta, M., (2010) Int. J. Immunopathol. Pharmacol., 23, pp. 335-343Hoenderdos, N.L., Rosema, N.A., Slot, D.E., Timmerman, M.F., Van Der Velden, U., Van Der Weijden, G.A., (2009) Int. J. Dent. Hyg., 7, pp. 294-298Gosau, M., Hahnel, S., Schwarz, F., Gerlach, T., Reichert, T.E., Burgers, R., (2010) Clin. Oral Implants Res., 21, pp. 866-872Barbour Me, O.S.D., Jagger, D.C., (2007) Colloids Surf. A: Physicochem. Eng. Aspects, 307, pp. 116-120Ungvari, K., Pelsoczi, I.K., Kormos, B., Oszko, A., Rakonczay, Z., Kemeny, L., Radnai, M., Turzo, K., (2010) J. Biomed. Mater. Res. B Appl. Biomater., 94, pp. 222-229Wicht, M.J., Haak, R., Lummert, D., Noack, M.J., (2003) Am. J. Dent., 16 (SPEC NO), pp. 25a-30aMarinone, M.G., Savoldi, E., (2000) Minerva Stomatol., 49, pp. 221-226Sreenivasan, P.K., Haraszthy, V.I., Zambon, J.J., (2013) Lett. Appl. Microbiol., 56, pp. 14-20Hossainian, N., Slot, D.E., Afennich, F., Van Der Weijden, G.A., (2011) Int. J. Dent. Hyg., 9, pp. 171-181Rosema, N.A., Timmerman, M.F., Versteeg, P.A., Van Palenstein Helderman, W.H., Van Der Velden, U., Van Der Weijden, G.A., (2008) J. Periodontol., 79, pp. 1386-1394Horwitz, J., Machtei, E.E., Zuabi, O., Peled, M., (2005) J. Periodontol., 76, pp. 334-340Strietzel, R., Hosch, A., Kalbfleisch, H., Buch, D., In vitro corrosion of titanium (1998) Biomaterials, 19 (16), pp. 1495-1499. , DOI 10.1016/S0142-9612(98)00065-9, PII S0142961298000659, Symposium G: Biomaterials: Perpectives for Research and Industry at the Century ChangeAlves Rezende, M.C., Alves, A.P., Codaro, E.N., Dutra, C.A., (2007) J. Mater. Sci. Mater. Med., 18, pp. 149-154(2009) Standard Test Method for Conducting Cyclic Potentiodynamic Polarization Measurements for Localized Corrosion Susceptibility of Iron-, Nickel-, or Cobalt-based Alloys, , http://www.astm.org/Standard/index.shtml, American Society For Testing Astm-G61-86 Materials ASTM West Conshohocken (Available at:)(2004) Standard Practice for Laboratory Immersion Corrosion Testing of Metals, , http://www.astm.org/Standard/index.shtml, American Society For Testing Astm-G31-72 Materials ASTM West Conshohocken (Avaliable at:)Souza, M.E., Lima, L., Lima, C.R., Zavaglia, C.A., Freire, C.M., (2009) J. Mater. Sci. Mater. Med., 20, pp. 549-552Mathew, M.T., Barao, V.A., Yuan, J.C., Assuncao, W.G., Sukotjo, C., Wimmer, M.A., (2012) J. Mech. Behav. Biomed. Mater., 8, pp. 71-85Messer, R.L., Tackas, G., Mickalonis, J., Brown, Y., Lewis, J.B., Wataha, J.C., (2009) J. Biomed. Mater. Res. B Appl. Biomater., 88, pp. 474-481Messer, R.L., Seta, F., Mickalonis, J., Brown, Y., Lewis, J.B., Wataha, J.C., (2010) J. Biomed. Mater. Res. B Appl. Biomater., 92, pp. 525-534Yang, C.H., Wang, Y.T., Tsai, W.F., Ai, C.F., Lin, M.C., Huang, H.H., (2011) Clin. Oral Implants Res., 22, pp. 1426-1432Morgan, T.D., Wilson, M., (2001) J. Appl. Microbiol., 91, pp. 47-53Bollen, C.M., Papaioanno, W., Van Eldere, J., Schepers, E., Quirynen, M., Van Steenberghe, D., (1996) Clin. Oral Implants Res., 7, pp. 201-211Fernandes Ac, V.F., Ariza, E., Rocha, L.A., Ribeiro, A.R.L., Vieira, A.C., Tribocorrosion behavior of plasma nitrided and plasma nitrided plus oxidised Ti-6Al-4V alloy (2006) Surf. Coat. Technol., 200, pp. 6218-6224Nakagawa, M., Matsuya, S., Udoh, K., (2002) Dent. Mater. J., 21, pp. 83-92Wennerberg, A., Albrektsson, T., (2009) Clin. Oral Implants Res., 20 (SUPPL. 4), pp. 172-184Gotfredsen, K., Berglundh, T., Lindhe, J., (2001) Clin. 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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Influence Of Corrosion On Lipopolysaccharide Affinity For Two Different Titanium Materials
No full textStatement of problem Titanium is subject to corrosion in the oral cavity, which could contribute to periimplantitis. However, the effect of corrosion on the lipopolysaccharide affinity for titanium remains unknown. Purpose This study evaluated the role of corrosion (in artificial saliva at pHs 3, 6.5, and 9) on the lipopolysaccharide (LPS) affinity for commercially pure titanium (cp-Ti) and Ti-6Al-4V alloy. Material and methods Seventy-two titanium disks were anodically polarized in a controlled environment (n=9). Control specimens were not corroded. Deionized water with different concentrations of LPS (1.5, 15, and 150 μg/mL) were used to treat the disks for 24 hours to investigate LPS adherence (n=3). Then specimens were immersed in LPS-free water to evaluate LPS elution at 24, 48, and 72 hours. Data were analyzed by the 2-way, 3-way, and 3-way repeated measures ANOVA, t tests, and the Tukey honestly significant difference (HSD) tests (α=.05). Results A greater corrosion rate of cp-Ti and Ti-6Al-4V alloy and a higher LPS adherence to titanium surfaces (P<.05) were noted at acidic pH. The LPS affinity was higher for the Ti-6Al-4V alloy than for cp-Ti (P<.05). More LPS was eluted from titanium surfaces after a 24-hour interval. Conclusion Lipopolysaccharide affinity for cp-Ti and Ti-6Al-4V alloy is influenced by the corrosion process.1106462470Nakagawa, M., Matsuya, S., Udoh, K., Effects of fluoride and dissolved oxygen concentrations on the corrosion behavior of pure titanium and titanium alloys (2002) Dent Mater J, 21, pp. 83-92Gil, F.J., Canedo, R., Padros, A., Baneres, M.V., Arano, J.M., Fretting corrosion behaviour of ball-and-socket joint on dental implants with different prosthodontic alloys (2003) Biomed Mater Eng, 13, pp. 27-34Nakagawa, M., Matsuya, S., Shiraishi, T., Ohta, M., Effect of fluoride concentration and pH on corrosion behavior of titanium for dental use (1999) J Dent Res, 78, pp. 1568-1572Nikolopoulou, F., Saliva and dental implants (2006) Implant Dent, 15, pp. 372-376Vieira, A.C., Ribeiro, A.R., Rocha, L.A., Celis, J.P., Influence of pH and corrosion inhibitors on the tribocorrosion of titanium in artificial saliva (2006) Wear, 261, pp. 994-1001Azzi, M., Szpunar, J.A., Tribo-electrochemical technique for studying tribocorrosion behavior of biomaterials (2007) Biomol Eng, 24, pp. 443-446De Assis, S.L., Wolynec, S., Costa, I., Corrosion characterization of titanium alloys by electrochemical techniques (2006) Electrochim Acta, 51, pp. 1815-1819Mabilleau, G., Bourdon, S., Joly-Guillou, M.L., Filmon, R., Basle, M.F., Chappard, D., Influence of fluoride, hydrogen peroxide and lactic acid on the corrosion resistance of commercially pure titanium (2006) Acta Biomater, 2, pp. 121-129Souza, M.E., Lima, L., Lima, C.R., Zavaglia, C.A., Freire, C.M., Effects of pH on the electrochemical behaviour of titanium alloys for implant applications (2009) J Mater Sci Mater Med, 20, pp. 549-552Huang, H.H., Effect of fluoride and albumin concentration on the corrosion behavior of Ti-6Al-4V alloy (2003) Biomaterials, 24, pp. 275-282Correa, C.B., Pires, J.R., Fernandes-Filho, R.B., Sartori, R., Vaz, L.G., Fatigue and fluoride corrosion on Streptococcus mutans adherence to titanium-based implant/component surfaces (2009) J Prosthodont, 18, pp. 382-387Joska, L., Fojt, J., Corrosion behaviour of titanium after short-term exposure to an acidic environment containing fluoride ions (2010) J Mater Sci Mater Med, 21, pp. 481-488Quirynen, M., De Soete, M., Van Steenberghe, D., Infectious risks for oral implants: A review of the literature (2002) Clin Oral Implants Res, 13, pp. 1-19Morgan, T.D., Wilson, M., The effects of surface roughness and type of denture acrylic on biofilm formation by Streptococcus oralis in a constant depth film fermentor (2001) J Appl Microbiol, 91, pp. 47-53Bollen, C.M., Papaioanno, W., Van Eldere, J., Schepers, E., Quirynen, M., Van Steenberghe, D., The influence of abutment surface roughness on plaque accumulation and peri-implant mucositis (1996) Clin Oral Implants Res, 7, pp. 201-211Quirynen, M., Bollen, C.M., Willems, G., Van Steenberghe, D., Comparison of surface characteristics of six commercially pure titanium abutments (1994) Int J Oral Maxillofac Implants, 9, pp. 71-76Simon, B.I., Goldman, H.M., Ruben, M.P., Baker, E., The role of endotoxin in periodontal disease. I. A reproducible, quantitative method for determining the amount of endotoxin in human gingival exudate (1969) J Periodontol, 40, pp. 695-701Wilson, M., Biological activities of lipopolysaccharides from oral bacteria and their relevance to the pathogenesis of chronic periodontitis (1995) Sci Prog, 78 (PART 1), pp. 19-34Quirynen, M., Vogels, R., Peeters, W., Van Steenberghe, D., Naert, I., Haffajee, A., Dynamics of initial subgingival colonization of 'pristine' peri-implant pockets (2006) Clin Oral Implants Res, 17, pp. 25-37Giannelli, M., Bani, D., Tani, A., Pini, A., Margheri, M., Zecchi-Orlandini, S., In vitro evaluation of the effects of low-intensity Nd:YAG laser irradiation on the inflammatory reaction elicited by bacterial lipopolysaccharide adherent to titanium dental implants (2009) J Periodontol, 80, pp. 977-984Nelson, S.K., Knoernschild, K.L., Robinson, F.G., Schuster, G.S., Lipopolysaccharide affinity for titanium implant biomaterials (1997) J Prosthet Dent, 77, pp. 76-82Knoernschild, K.L., Tompkins, G.R., Schuster, G.S., Lefebvre, C.A., Russell, C.M., Effect of treatment concentration on lipopolysaccharide affinity for two alloys (1997) Dent Mater, 13, pp. 111-117Knoernschild, K.L., Bacon, W.L., Fischman, G.S., Campbell, S.D., Effect of pH on endotoxin affinity for metal-ceramic alloys (2001) J Prosthet Dent, 86, pp. 644-649Knoernschild, K.L., Lefebvre, C.A., Schuster, G.S., Payant, L.M., Gagnon, F.M., Endotoxin adherence to and elution from two casting alloys (1994) Int J Prosthodont, 7, pp. 22-29Knoernschild, K.L., Tompkins, G.R., Lefebvre, C.A., Schuster, G.S., Porphyromonas gingivalis lipopolysaccharide affinity for two casting alloys (1995) J Prosthet Dent, 74, pp. 33-38Gagnon, F., Knoernschild, K.L., Payant, L., Tompkins, G.R., Litaker, M.S., Schuster, G.S., Endotoxin affinity for provisional restorative resins (1994) J Prosthodont, 3, pp. 228-236Knoernschild, K.L., Tompkins, G.R., Lefebvre, C.A., Griffiths, L.L., Schuster, G.S., Effect of pH on Porphyromonas gingivalis endotoxin affinity for resins (1996) Int J Prosthodont, 9, pp. 239-247Robinson, F.G., Knoernschild, K.L., Sterrett, J.D., Tompkins, G.R., Porphyromonas gingivalis endotoxin affinity for dental ceramics (1996) J Prosthet Dent, 75, pp. 217-227Barao, V.A., Mathew, M.T., Assuncao, W.G., Yuan, J.C., Wimmer, M.A., Sukotjo, C., The role of lipopolysaccharide on the electrochemical behavior of titanium (2011) J Dent Res, 90, pp. 613-618Mathew, M.T., Barao, V.A., Yuan, J.C., Assuncao, W.G., Sukotjo, C., Wimmer, M.A., What is the role of lipopolysaccharide on the tribocorrosive behavior of titanium? (2012) J Mech Behav Biomed Mater, 8, pp. 71-85Barao, V.A., Mathew, M.T., Assuncao, W.G., Yuan, J.C., Wimmer, M.A., Sukotjo, C., Stability of cp-Ti and Ti-6Al-4V alloy for dental implants as a function of saliva pH - An electrochemical study (2012) Clin Oral Implants Res, 23, pp. 1055-1062(2009), http://www.astm.org/Standard/index.shtml, American Society for Testing and Materials. ASTM-G61-G86. Standard Test Method for Conducting Cyclic Potentiodynamic Polarization Measurements for Localized Corrosion Susceptibility of Iron-, Nickel-, or Cobalt-Based Alloys. West Conshohocken, Pa: ASTM(2004), http://www.astm.org/Standard/index.shtml, American Society for Testing and Materials. ASTM-G31-G72. Standard practice for laboratory immersion corrosion testing of metals. West Conshohocken, Pa: ASTMLiu, I.H., Lee, T.M., Chang, C.Y., Liu, C.K., Effect of load deflection on corrosion behavior of NiTi wire (2007) J Dent Res, 86, pp. 539-543Baboian, R., (2005) Corrosion Tests and Standards: Application and Interpretation, pp. 107-130. , 2nd ed. ASTM International West Conshohocke
Variations on the Author
Get PDF“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
Get PDFWe 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
Get PDFWe 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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