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Search Results: 1 - 10 of 21482 matches for " Gibson Luiz; "
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Interkulturelle Online-Kommunikation: Konversationsanalyse und die Analyse asynchroner schriftlichter Diskussionen Intercultural Communication Online: Conversation Analysis and the Investigation of Asynchronous Written Discourse Comunicación intercultural en línea: Análisis de conversación y la investigación de discurso escrito asincrónico
Will Gibson
Forum : Qualitative Social Research , 2008,
Abstract: Der vorliegende Artikel arbeitet methodologische Probleme heraus, die entstehen, wenn bei der Analyse von schriftlichen, asynchronen Online-Diskussionen "Kultur" und "Interkulturalit t" als interaktiv darstellbare und beobachtbare Ph nomene behandelt werden. Insbesondere wird untersucht, wie die Konversationsanalyse mit ihrem Fokus auf Sequenzialit t und das Konzept der Zugeh rigkeitskategorisierungen die Analyse von Kultur als verschriftlichte, interaktive Leistung unterstützen k nnte. Im Beitrag wird dargelegt, dass trotz der offensichtlichen Unterschiede zwischen sequenziellen mündlichen Gespr chen und verschriftlichten Online-Diskussionen durch die Konversationsanalyse interessante Methoden bereitgestellt werden, um Online-Diskussionen zu analysieren. Die beiden Aspekte der Sequenzialit t und der Zugeh rigkeitskategorien sind dabei hilfreich, um anhand von Verschriftlichungen in Online-Foren die Konstruktion sichtbarer und als solche erkennbare, interkulturelle Diskurspraktiken nachzuzeichnen. URN: urn:nbn:de:0114-fqs0901493 This paper works through the methodological issues involved in treating "culture" and "interculturality" as interactionally demonstrable and observable phenomena in written online asynchronous discourse. In particular, the paper explores the ways that conversation analysis (CA) and its focus on sequentiality and membership categorization analysis might aid the analysis of culture as a textural interactional achievement. The paper argues that, while there are some clear differences between sequential talk and written asynchronous discourse, there are still interesting ways in which CA's analytic foci may be worked through in relation to online discourse. Both the concern with sequentiality and with membership categories may well help us to see how the construction of visible and recognizable intercultural discourse practices are accomplished through written modes in online forums. URN: urn:nbn:de:0114-fqs0901493 Este artículo aborda los temas metodológicos involucrados al tratar la "cultura" y la "interculturalidad" como fenómenos interactivamente observables y demostrables en el discurso escrito asincrónico. En particular, explora las formas en que el análisis de conversación (AC) y su foco en la secuencialidad y el análisis de categorización de membresía pueden ayudar al análisis de la cultura como una realización interactiva textual. Se argumenta que, aunque hay algunas claras diferencias entre el habla secuencial y el discurso escrito asincrónico, hay todavía formas interesantes en las que los focos analíticos del AC pueden a
Recubrimiento de las recesiones gingivales con la técnica de injerto conjuntivo subepitelial asociado al deslizamiento coronario del colgajo: relato de caso clínico
Cruz,Ariadne Cristiane Cabral; Barquero Cordero,Ernesto; Sartori,Rafael; Pilatti,Gibson Luiz; Santos,Fábio André;
Acta Odontológica Venezolana , 2008,
Abstract: gingival recession is defined as the apical location of the gingival in relation to the cement-enamel junction, being predominant in buccal aspect. other than causing esthetic disharmony, it can cause dentine sensitive. to treat gingival recession, the following techniques can be employed: pedicle gingival graft, free gingival graft, and guided tissue regeneration. the purpose of this study is to present a case report with generalized gingival recession. after anamneses and clinical exam, the etiology of the gingival recession was indicated as incorrect oral hygiene and occlusal trauma. the patient receive adequate oral hygiene instruction and the occlusion was adjusted. five percent potassium nitrate was applied locally for two months, however, the patient still complained of dentine sensitivity and lack of esthetics. for root coverage, coronal positioned flaps were conduct with or without free subepithelial connective tissue. one year later the teeth presented absence of bleeding and dentine sensitive, with normal probe depth (<3mm). the results of this techniques fulfilled the patients esthetic need and eliminated the dentinal sensitivity.
Influência de substancias com pH ácido sobre a microdureza de resinas compostas
Tatiana Moroz Leite,Larissa Alves Bohaienko,Mariely Luciano,Gibson Luiz Pillati
Stomatos , 2010,
Abstract: Resin composites are aesthetic restorative materials widely used in Dentistry and changes in pH can promote amendments in composite surface, compromising their initial characteristics. The aim of this study was to evaluate, in vitro, the effect of low pH beverages on two commercially available materials, the composite resins ICE (SDI) and Durafill VS (Heraeus Kulzer). The materials were evaluated for surface microhardness obtained by Vickers microhardness testing. Fifteen samples were prepared with 11 mm diameter and 2 mm thick, each restorative material. The samples were kept in storage conditions of the following substances: Gatorade (pH 2,9); Coca- Cola (pH 2,2) and distilled water (pH 6,0; control group) under temperature of 37 ° C, and the environment of immersing exchanged every 24 hours. Five samples of each material were immersed in the beverages tested and monitored for periods of 24 hours, 7, 14 and 21 days. The results were submitted to multifactorial analysis of variance and Tukey test. There were statistically significant differences (p <0.05) for factors environment, material and time, and for the interaction between them. The distilled water resulted in higher values of microhardness, followed by Coca-Cola and Gatorade . The highest values of microhardness were obtained at baseline, followed by 7, 14 and 21 days. There was no statistically significant difference (p> 0,05) between the times of 14 and 21 days. It was concluded that the nanocomposite better results and that the acidic pH associated with progressive immersion time significantly alter the microhardness of the composites evaluated.
Effectiveness of EDTA and EDTA-T brushingm on the removal of root surface smear layer
Sampaio José Eduardo Cezar,Rached Ricardo Samih Georges Abi,Pilatti Gibson Luiz,Theodoro Letícia Helena
Pesquisa Odontológica Brasileira , 2003,
Abstract: The purpose of this study was to compare the removal of root surface smear layer following active application of EDTA gel and EDTA-T (texapon) gel in different concentrations (5%, 10%, 15%, 20% and 24%), using scanning electron microscopy. A total of 220 dentin blocks obtained from the root surfaces of extracted teeth were divided into 3 groups: Group I - (control) application of saline solution (n = 20); Group II - EDTA gel (pH 7.0) was applied in the following concentrations: 5%, 10%, 15%, 20% and 24% (n = 100); Group III - EDTA-T gel (pH 7.0) applied in the same concentrations described above (n = 100). The photomicrographs were evaluated by one calibrated examiner using a smear layer removal index and following statistical analysis (Kruskal-Wallis test). The results demonstrated that the specimens treated with EDTA and EDTA-T gel presented a better smear layer removal than the control group (p < 0.01); no statistically significant differences were observed between the EDTA and EDTA-T groups and between the concentrations tested (Mann-Whitney, p > 0.05). Within the limits of this study, it can be concluded that all treatment modalities effectively removed the smear layer from the root surface. The addition of texapon into the EDTA gel formulation did not increase its effectiveness.
Recubrimiento de las recesiones gingivales con la técnica de injerto conjuntivo subepitelial asociado al deslizamiento coronario del colgajo: relato de caso clínico Coronal positioned flaps associated with free subepitelial conective tissue graft for treatment of gingival recession: clinical case report
Ariadne Cristiane Cabral Cruz,Ernesto Barquero Cordero,Rafael Sartori,Gibson Luiz Pilatti
Acta Odontológica Venezolana , 2008,
Abstract: Recesión gingival es definida como la localización apical del margen gingival en relación a la unión cemento - esmalte, siendo predominante en la cara vestibular de los dientes. Además de provocar una desarmonía en la estética, puede causar sensibilidad destinaría. Para el tratamiento de recesiones gingivales han sido propuestas técnicas que pueden ser agrupadas en injertos pediculados, injertos libres y regeneración de tejidos guiada. El objetivo de este trabajo es relatar el caso clínico de un paciente con recesiones gingivales generalizadas. Luego de la anamnesis y examen clínico, se atribuye la etiología de las recesiones al cepillado incorrecta y trauma oclusal. Se realizó una adecuada instrucción de higiene bucal y ajuste oclusal. Se procedió a la aplicación de nitrato de potasio al 5% por dos meses, sin embargo, él paciente se quejaba de sensibilidad y del aspecto estético. Para el recubrimiento de las raíces expuestas fueron realizadas las técnicas de colgajo posicionado coronalmente asociado y no asociado al injerto conjuntivo subepitelial. Luego de un a o los dientes muestran ausencia de sangramiento y sensibilidad destinaría, con profundidad de sondaje normal (<3mm). Los resultados de esta técnica se muestran satisfactorios, atendiendo las expectativas del paciente. Gingival recession is defined as the apical location of the gingival in relation to the cement-enamel junction, being predominant in buccal aspect. Other than causing esthetic disharmony, it can cause dentine sensitive. To treat gingival recession, the following techniques can be employed: pedicle gingival graft, free gingival graft, and guided tissue regeneration. The purpose of this study is to present a case report with generalized gingival recession. After anamneses and clinical exam, the etiology of the gingival recession was indicated as incorrect oral hygiene and occlusal trauma. The patient receive adequate oral hygiene instruction and the occlusion was adjusted. Five percent potassium nitrate was applied locally for two months, however, the patient still complained of dentine sensitivity and lack of esthetics. For root coverage, coronal positioned flaps were conduct with or without free subepithelial connective tissue. One year later the teeth presented absence of bleeding and dentine sensitive, with normal probe depth (<3mm). The results of this techniques fulfilled the patients esthetic need and eliminated the dentinal sensitivity.
Effect of desensitizing toothpastes on dentin
Shelon Cristina Souza Pinto,Camila Maggi Maia Silveira,Márcia Thaís Pochapski,Gibson Luiz Pilatt
Brazilian Oral Research , 2012, DOI: 10.1590/s1806-83242012000500006
Abstract: The objective of this study was to analyze the effects of toothbrushing with desensitizing toothpastes on dentin permeability and dentinal tubule occlusion. Fifty rats provided two hundred incisor teeth divided into five groups: DW, brushed with distilled water (control); FT, brushed with fluoride toothpaste; SCT, brushed with strontium chloride toothpaste; PCT, brushed with potassium citrate toothpaste; and PNT, brushed with potassium nitrate toothpaste. Cavities were prepared to expose the dentinal tubules, and the incisor teeth were brushed using the experimental agents. After each treatment, Evans blue dye solution was applied to the teeth. Dentin permeability was analyzed using scanning electron microscopy and energy-dispersive X-rays (EDX). There were significant differences (p < 0.0001, ANOVA) among the groups regarding dentin permeability, number of dentinal tubules, diameter of dentinal tubules, and opened tubular area. In the SCT, PCT and PNT groups, opened and partially occluded tubules, deposits, and a few smear layers were observed. In the DW and FT groups, most of the dentinal tubules were open, with no deposits or smear layers on the dentin. EDX revealed peaks of calcium and phosphorus in all of the groups, as well as traces of strontium in the SCT group and of potassium in the PCT and PNT groups. Desensitizing toothpaste decreased dentin permeability, although it produced only partial dentin tubule occlusion.
Effectiveness of EDTA and EDTA-T brushingm on the removal of root surface smear layer
Sampaio, José Eduardo Cezar;Rached, Ricardo Samih Georges Abi;Pilatti, Gibson Luiz;Theodoro, Letícia Helena;Batista, Luiz Henrique Carvalho;
Pesquisa Odontológica Brasileira , 2003, DOI: 10.1590/S1517-74912003000400005
Abstract: the purpose of this study was to compare the removal of root surface smear layer following active application of edta gel and edta-t (texapon) gel in different concentrations (5%, 10%, 15%, 20% and 24%), using scanning electron microscopy. a total of 220 dentin blocks obtained from the root surfaces of extracted teeth were divided into 3 groups: group i - (control) application of saline solution (n = 20); group ii - edta gel (ph 7.0) was applied in the following concentrations: 5%, 10%, 15%, 20% and 24% (n = 100); group iii - edta-t gel (ph 7.0) applied in the same concentrations described above (n = 100). the photomicrographs were evaluated by one calibrated examiner using a smear layer removal index and following statistical analysis (kruskal-wallis test). the results demonstrated that the specimens treated with edta and edta-t gel presented a better smear layer removal than the control group (p < 0.01); no statistically significant differences were observed between the edta and edta-t groups and between the concentrations tested (mann-whitney, p > 0.05). within the limits of this study, it can be concluded that all treatment modalities effectively removed the smear layer from the root surface. the addition of texapon into the edta gel formulation did not increase its effectiveness.
Calcium Homeostasis in Articular Chondrocytes of Two Different Animal Species  [PDF]
Rachel White, John Stanley Gibson
Open Journal of Veterinary Medicine (OJVM) , 2018, DOI: 10.4236/ojvm.2018.88012
Abstract: Introduction: Intracellular calcium concentration ([Ca2+]i) is a critical parameter in cellular homeostasis, including articular chondrocytes. Perturbed [Ca2+]i of chondrocytes may be associated with joint disease. The objective of the study was to compare large animal models for investigating Ca2+ homeostasis in chondrocytes. Materials and Methods: The gross anatomy of the metacarpophalangeal joint (MCP) of cattle and sheep was compared, along with the effect of various manoeuvres used to study the mechanisms of Ca2+ homeostasis in chondrocytes from load-bearing areas. The gross anatomy was observed before and after dissection, and internal architecture was examined after sectioning. Cartilage thickness was measured with a digital micrometer. Chondrocyte yield was determined after isolation. Chondrocytes were incubated with Fura-2 and Ca2+i followed in different extracellular conditions. A hypotonic shock (HTS) was used to mimic removal of a load. Results: The results showed that ovids and bovids were skeletally immature and aspects of Ca2+ homeostasis were similar. Ovine chondrocytes had higher resting fluorescence, consistent with elevated resting Ca2+ levels. Results from ion substitution experiments were consistent with a role for Na+/Ca2+ exchange, and swelling-induced Ca2+ enters into the cytoplasm via the plasma membrane and intracellular stores. Conclusions: Ca2+ homeostasis in chondrocytes from both species behaved in a similar manner to HTS and ion substitutions. Differences in resting [Ca2+]i could be associated with species, stage of maturation, or Fura-2 itself and require further investigation. These findings contribute to our understanding of the physiology of articular cartilage in different species, and their potential use as models for studying joint disease in humans.
A scanning electron microscopy study of root surface smear layer removal after topical application of EDTA plus a detergent
Sampaio, José Eduardo Cezar;Campos, Flávia Pavan;Pilatti, Gibson Luiz;Theodoro, Letícia Helena;Leite, Fábio Renato Manzolli;
Journal of Applied Oral Science , 2005, DOI: 10.1590/S1678-77572005000300009
Abstract: the aim of the present study was to compare root surface smear layer removal following topical application of edta and edta-t (texapon). extracted human teeth had their cementum removed and were mechanically scaled. a total of 220 root specimens were obtained and were randomly assigned to the following groups: i-saline solution (control), ii-edta; iii-edta-t. groups ii and iii specimens were assigned to different edta gel concentrations: 5%, 10%, 15%, 20% and 24%. smear layer removal score was assessed for each specimen by scanning electron microscopy. the results demonstrated that edta and edta-t gel led to a higher root surface smear layer removal when compared to the control group. the 5% edta gel also showed a higher smear layer removal than the 15%, 20% and 24% edta gels (p<0.05). no difference could be found between the different concentrations of edta-t gels tested (p>0.05). edta gels had statistically significantly lower smear layer scores than the edta-t gels for the 5% and 10% concentrations. the results suggested that topical application of edta or edta-t gel led to significant smear layer removal of the mechanically treated root surfaces. the addition of a detergent to the edta gel formula did not improve smear layer removal of the root surface.
Rebonding of unused brackets with different orthodontic adhesives
Jimenez, Emigdio Enrique Orellana;Hilgenberg, Sérgio Paulo;Rastelli, Márcia Cristina;Pilatti, Gibson Luiz;Orellana, Bruno;Coelho, Ulisses;
Dental Press Journal of Orthodontics , 2012, DOI: 10.1590/S2176-94512012000200014
Abstract: objective: to compare in vitro shear bond strength (sbs) of different orthodontic adhesives in bonding and repeatedly rebonding metal brackets, and to evaluate the bond failure site with the adhesive remnant index (ari). methods: specimens consisted of 90 extracted human first premolars, randomly divided into three groups (n=30). the adhesives alpha plast (ap), concisetm (co) and transbondtm xt (tb) were used in each group. three sbs tests were performed, i.e., one at t0 (initial) and the other two at t1 and t2 (first and second rebondings, respectively), observing a 24-hour interval. the tests were performed in a shimadzu ag-i (10kn) sbs testing machine, at a speed of 0.5 mm/min. results: sbs data were subjected to anova, tukey's test and bonferroni test (p<0.05). for the ari, the kruskal wallis test was performed, followed by the dunn test. the results revealed that at t0 groups ap and co showed sbs values that were near, but above tb values; and at t1 and t2, the highest sbs values were observed for the ap group, followed by the co and tb groups. conclusion: statistically significant differences were found in sbs between groups ap, co and tb during bonding and repeated rebondings of unused metal brackets, with group ap achieving the highest sbs value. regarding ari, adhesive ap exhibited bond failure at the enamel-adhesive interface, with a higher enamel fracture frequency.
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