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Antimicrobial Effects of Calcium Hydroxide and Chlorhexidine on Enterococcus faecalis

DELGADO, Ronan J. R.; GASPAROTO, Thais H.; SIPERT, Carla R.; PINHEIRO, Claudia R.; MORAES, Ivaldo G.; GARCIA, Roberto B.; BRAMANTE, Clovis M.; CAMPANELLI, Ana P.; BERNARDINELI, Norberti
Fonte: ELSEVIER SCIENCE INC Publicador: ELSEVIER SCIENCE INC
Tipo: Artigo de Revista Científica
ENG
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Introduction: Endodontic treatment is commonly based on nonspecific elimination of intraradicular micro-organisms. Although some authors prefer single-visit root canal operations for endodontic treatment, several studies have shown the importance of intracanal medication between sessions to kill microorganisms that biomechanical preparations alone cannot achieve. The purpose of this study was to evaluate the efficacy of calcium hydroxide Ca(OH)2 and chlorhexidine gel on the elimination of intratubular Enterococcus faecalis. Methods: Human uniradicular teeth contaminated with E. faecalis were treated with Ca(OH)(2), 2% chlorhexidine gel, Ca(OH)(2) plus 2% chlorhexidine gel, or saline (0.9% NaCl) as a negative control. Samples obtained at a depth of 0 to 100 mu m and 100 to 200 mu m from these root canal preparations were analyzed for bacterial load by counting the number of colonyforming units (CFUs) and bacterial viability using fluorescence microscopy. Results: A significant decrease in the number of CFUs and the percentage of viable E. faecalis was observed after treatment with either Ca(OH)(2) or chlorhexidine when compared with the control group. Additionally, chlorhexidine gel had a significantly higher antimicrobial efficacy as measured by the number of CFUs and the percentage of viable cells than Ca(OH)(2). No differences were observed between the antimicrobial properties of chlorhexidine gel with and without the addition of Ca(OH)(2). Conclusion: Both Ca(OH)(2) and chlorhexidine have antimicrobial effects on E. faecalis. Chlorhexidine had increased antimicrobial activity when compared with Ca(OH)(2.) Ca(OH)(2) combined with chlorhexidine showed similar antimicrobial activity to chlorhexidine alone. (J Endod 2010;36:1389-1393)

Effect of Chlorhexidine on Denture Biofilm Accumulation

Andrade, Ingrid Machado de; Cruz, Patricia Costa; Lovato-Silva, Cláudia H.; Souza, Raphael F. de; Souza-Gugelmin, Maria Cristina Monteiro; Paranhos, Helena de Freitas Oliveira
Fonte: WILEY-BLACKWELL; MALDEN Publicador: WILEY-BLACKWELL; MALDEN
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
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Purpose: Adequate denture hygiene can prevent and treat infection in edentulous patients, who are frequently elderly and have difficulty brushing their teeth. This study evaluated the efficacy of complete denture biofilm removal using a chlorhexidine solution in two concentrations: 0.12% and 2.0%. Materials and Methods: Sixty complete denture wearers participated in a trial for 21 days after receiving brushing instructions. They were distributed into three groups, according to the tested solution and regimen (n = 20): (G1) Control (daily overnight soaking in water); (G2) daily immersion at home in 0.12% chlorhexidine for 20 minutes after dinner; and (G3) a single immersion in 2.0% chlorhexidine for 5 minutes at the end of the experimental period, performed by a professional. Biofilm coverage area (%) was quantified on the internal surface of maxillary dentures at baseline and after 21 days. Afterward, the differences between initial and posttreatment results were compared by means of the Kruskal-Wallis test (a = 0.05). Results: Median values for biofilm coverage area after treatment were: (G1) 36.0%; (G2) 5.3%; and (G3) 1.4%. Differences were significant (KW = 35.25; p < 0.001), although G2 and G3 presented similar efficacy in terms of biofilm removal. Conclusions: Both chlorhexidine-based treatments had a similar ability to remove denture biofilm. Immersion in 0.12% or 2.0% chlorhexidine solutions can be used as an auxiliary method for cleaning complete dentures.; Sao Paulo Research Foundation (FAPESP) [2005/55705-2]

Antimicrobial activity of calcium hydroxide and chlorhexidine on intratubular Candida albicans

Delgado, Ronan Jacques Rezende; Gasparoto, Thaís Helena; Sipert, Carla Renata; Pinheiro , Cláudia Ramos; Moraes , Ivaldo Gomes de; Garcia , Roberto Brandao; Duarte , Marco Antonio Hungaro; Bramante , Clovis Monteiro; Torres , Sergio Aparecido; Garlet ,
Fonte: Sichuan University Press; Chengdu Publicador: Sichuan University Press; Chengdu
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
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This study investigated the efficacy of calcium hydroxide and chlorhexidine gel for the elimination of intratubular Candida albicans (C. albicans). Human single-rooted teeth contaminated with C. albicans were treated with calcium hydroxide, 2% chlorhexidine gel, calcium hydroxide plus 2% chlorhexidine gel, or saline (0.9% sodium chloride) as a positive control. The samples obtained at depths of 0–100 and 100–200 µm from the root canal system were analyzed for C. albicans load by counting the number of colony forming units and for the percentage of viable C. albicans using fluorescence microscopy. First, the antimicrobial activity of calcium hydroxide and the 2% chlorhexidine gel was evaluated by counting the number of colony forming units. After 14 days of intracanal medication, there was a significant decrease in the number of C. albicans colony forming units at a depth of 0–100 µm with chlorhexidine treatment either with or without calcium hydroxide compared with the calcium hydroxide only treatment. However, there were no differences in the number of colony forming units at the 100–200 µm depth for any of the medications investigated. C. albicans viability was also evaluated by vital staining techniques and fluorescence microscopy analysis. Antifungal activity against C. albicans significantly increased at both depths in the chlorhexidine groups with and without calcium hydroxide compared with the groups treated with calcium hydroxide only. Treatments with only chlorhexidine or chlorhexidine in combination with calcium hydroxide were effective for elimination of C. albicans; FAPESP 2007/00306-1; FAPESP 2007/003061; CAPES; CAPES

Evidence on the best chlorhexidine concentration to perform oral hygiene: meta-analysis; Evidências sobre a melhor concentração de clorexidina para higiene bucal: metanálise

Damato, Juliana Rizzo Gnatta; Menezes, Isa Rodrigues da Silveira Cabral de; Lacerda, Rubia Aparecida; Barbosa, Maria Clara Padoveze Fonseca
Fonte: São Paulo Publicador: São Paulo
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
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Although scientific literature has demonstrated the relevance of oral hygiene with chlorhexidine in preventing ventilation-associated pneumonia, there is a wide variation of concentrations, frequency and techniques when using the antiseptic. The aim of this research was to assessthe best chlorhexidine concentration used to perform oral hygiene to prevent ventilation-associated pneumonia. A systematic review followed by four meta-analysis using chlorhexidine concentration as criterion was carried out. Articles in English, Spanish or Portuguese indexed in the Cochrane, Embase, Lilacs, PubMed/Medline and Ovid electronic databases were selected. The research was carried out from May to June 2011. The primary outcome measure of interest was ventilation-associated pneumonia. Ten primary studies were divided in four groups (Gl-4), based on chlorhexidine concentration criterion. Gl (5 primary studies, chlorhexidine 0.12%) showed homogeneity among studies and the use of chlorhexidine represented a protective factor. G2 (3 primary studies, chlorhexidine 0.20%) showed heterogeneity among studies and chlorhexidine did not represent a protective factor. G3 (2 primary studies, chlorhexidine 2,00%) showed homogeneity among studies and the use of chlorhexidine was significant. G4 (10 primary studies with different chlorhexidine concentrations) showed homogeneity among studies and the common Relative Risk was significant. Statistic analyses showed a protective effect of oral hygiene with chlorhexidine in preventing ventilation-associated pneumonia. However...

Estudo in vitro da influência da contaminação com Streptococcus mutans e da descontaminação com digluconato de clorexidina 2% na resistência de união de sistemas adesivos à dentina humana; In vitro study of the influence of Streptococcus mutans contamination and 2% chlorhexidine digluconate disinfection on bond strength of adhesive systems to human dentin

Bengtson, Camilla Regina Galvao
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 21/06/2007 PT
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O objetivo desse trabalho foi avaliar, in vitro, a influência da contaminação com Streptococcus mutans e da desinfecção com solução de digluconato de clorexidina 2% na adesão de dois sistemas adesivos (um sistema adesivo com condicionamento ácido prévio e um sistema adesivo autocondicionante) à dentina de molares humanos. Para o estudo, foram utilizados 80 terceiros molares humanos hígidos, com a face oclusal lixada até a exposição de uma superfície plana de dentina. Os dentes foram divididos aleatoriamente em 8 grupos (n=10) de acordo com o sistema adesivo utilizado e tratamento superficial realizado: G1 ? Controle Single Bond 2 (SB); G2 ? Controle Clearfil SE Bond (SE); G3 ? Desinfecção com clorexidina SB; G4 ? Desinfecção com clorexidina SE; G5 ? Contaminação com Streptococcus mutans SB; G6 ? Contaminação com Streptococcus mutans SE; G7 ? Contaminação com Streptococcus mutans e desinfecção com clorexidina SB e G8 ? Contaminação com Streptococcus mutans e desinfecção com clorexidina SE. Corpos de prova em resina composta foram confeccionados nas superfícies tratadas e os dentes foram armazenados em água destilada à 37ºC por 24 horas. As amostras foram seccionadas verticalmente obtendo-se espécimes com área de secção transversal de aproximadamente 0...

Avaliação in vitro da viabilidade de Enterococcus faecalis e Candida albicans nos túbulos dentinários após a aplicação de hidróxido de cálcio e clorexidina gel 2%; In vitro evauluation of the viability of Enterococcus faecalis and Candida albicans in dentinal tubules after placement of calcium hydroxide and chlorhexidine gel 2%

Delgado, Ronan Jacques Rezende
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 12/06/2007 PT
Relevância na Pesquisa
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Uma infecção pulpar pode resultar na colonização microbiana de todo sistema de canais radiculares incluindo os túbulos dentinários. Estes microorganismos e seus produtos tóxicos são responsáveis pelo desenvolvimento e persistência da periodontite apical de origem endodôntica. O presente estudo objetivou avaliar a viabilidade de E. faecalis e C. albicans em túbulos dentinários após a aplicação de hidróxido de cálcio, clorexidina gel 2%, hidróxido de cálcio associado à clorexidina gel 2% e soro fisiológico, através da análise por cultura microbiológica e microscopia de fluorescência. Para tanto 120 raízes de dentes humanos foram padronizadas e autoclavadas, sendo posteriormente divididas em 2 grupos (n= 60) para contaminação com E. faecalis e C. albicans por 21 dias. Em seguida, foram divididas em 8 grupos (n= 15) para aplicação das substâncias antimicrobianas nos canais radiculares e posterior incubação em estufa por 14 dias. Amostras da dentina radicular na extensão de 0 - 100 µm e de 100 - 200 µm foram coletadas e submetidas à cultura microbiológica através do plaqueamento em meios de cultura. Após 48 horas de incubação promoveu-se a avaliação das UFC. Paralelamente, as amostras foram processadas para análise em microscopia de fluorescência com auxílio de marcadores fluorescentes específicos...

Análise química da clorexidina misturada ou não ao hidróxido de cálcio; Chemical analysis of chlorhexidine mixed or not with calcium hydroxide

Barbin, Eduardo Luiz
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 15/02/2008 PT
Relevância na Pesquisa
37.3429%
O sucesso da terapia endodôntica depende da limpeza, anti-sepsia, escultura e obturação hermética dos canais radiculares, no entanto, o preparo biomecânico não gera redução microbiana suficiente na totalidade dos casos. Devido à inconfiabilidade inerente ao tratamento, parte dos casos ainda resulta em insucesso. As pastas de hidróxido de cálcio vêm sendo empregadas com a finalidade de ampliar a eficiência anti-séptica do tratamento dos canais radiculares além de estimular a recuperação dos tecidos afetados pela infecção endodôntica. O digluconato de clorexidina tem sido empregado na endodontia devido ao amplo espectro de ação principalmente contra "Enterococcus faecalis" e "Candida albicans" e vem sendo adicionado às pastas de hidróxido de cálcio uma vez que as virtudes de um complementam as deficiências do outro. No entanto, devido à estrutura molecular da clorexidina e aos níveis elevados de pH promovidos pelo hidróxido de cálcio, há indícios de risco sistêmico na sua utilização por causa da provável decomposição da clorexidina em radicais livres e para-cloroanilina que está classificada como possível agente carcinogênico em humanos pela IARC. O presente estudo teve como objetivo investigar quimicamente...

Avaliação microbiológica da clorexidina empregada como agente irrigante e medicamentoso em endodontia: Estudo crítico dos modelos metodológicos; Microbiological assessment of the Chlorhexidine applied as root canal irrigant and dressing in Endodontcs. A Critical study of methodological models

Martins, Guilherme Henrique Rosa
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 19/01/2009 PT
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Neste trabalho, foi realizado um estudo crítico dos modelos metodológicos in vivo e in vitro sobre a avaliação microbiológica da clorexidina empregada como agente irrigante e medicação intracanal na terapia endodôntica. Para tanto, foi realizada uma busca sistemática nas bases de dados: Medline, Lilacs e BBO nos últimos dez anos sobre o assunto em questão. Foram selecionados os trabalhos que avaliaram a clorexidina de uma maneira não combinada com outras substâncias ou fármacos, abordando sua utilização tanto como irrigante endodôntico, e como medicação intracanal. Para uma melhor análise, os trabalhos foram agrupados de acordo com a forma de uso e metodologia com seus dados tabulados, respectivamente: Clorexidina como irrigante in vitro, Clorexidina como irrigante in vivo, Clorexidina como medicação intracanal in vitro e Clorexidina como medicação intracanal in vivo. Na análise, pode-se observar a efetividade antimicrobiana da clorexidina como irrigante nos ensaios laboratoriais e clínicos, sendo nas formas de gel e líquida com variação na concentração de 0.2 a 2%. Quanto o uso da clorexidina como medicação intracanal, pode ser constatada sua atividade antimicrobiana em ambos ambientes experimentais...

Efeito in situ da associação de chá preto ao uso diário de clorexidina na alteração de cor e rugosidade superficial de resinas compostas; Influence of in situ association of black tea and chlorhexidine on the color change and surface roughness of composite resins.

Godoi, Ana Paula Terossi de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 11/12/2009 PT
Relevância na Pesquisa
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O presente estudo avaliou in situ a influência de fatores da dieta associado ao uso de clorexidina na cor e na rugosidade superficial de diferentes resinas compostas (Z250® - 3M-ESPE e Filtek Supreme® - 3M-ESPE). Foram confeccionados 112 corpos-de-prova (6,0x2,0mm) que foram polidos com disco abrasivos Super Snap® (Shofu). O estudo foi constituído por duas fases de 5 dias cada, com um período de washout de 9 dias entre elas. Os corpos-de-prova de cada um dos materiais foram divididos entre 14 voluntários e montados em dispositivo palatino, na região dos pré-molares e molares superiores e instalados nos participantes para a realização dos bochechos e da ingestão do chá em cada uma das fases do experimento. De acordo com sorteio aleatório, metade dos voluntários utilizou, na primeira fase do experimento, solução de gluconato de clorexidina 0,12% (S1) e a outra metade dos voluntários realizou os bochechos com uma solução placebo (S2), de mesma composição da solução original, porém sem adição de gluconato de clorexidina 0,12%. Os bochechos foram realizados 2 vezes ao dia, por 1 minuto, durante 5 dias. Todos os voluntários, após o bochecho com gluconato de clorexidina 0,12% ou placebo ingeriram 200 mL de chá em ambas as fases. Na segunda fase do experimento...

Análise da citotoxicidade do hipoclorito de sódio a 1%, do digluconato de clorexidina a 2% e do endoquil e seus efeitos na liberação de citocinas e óxido nítrico em culturas de macrófagos murinos; Cytotoxicity analysis of 1% sodium hypochlorite, of 2% chlorhexidine digluconate and of Endoquil and its effects on release of cytokine and nitric oxide in cultured murine macrophages

Siqueira, Danieli Colaço Ribeiro
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 03/02/2011 PT
Relevância na Pesquisa
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Avaliou-se a citotoxicidade do hipoclorito de sódio a 1%, do digluconato de clorexidina a 2% e do Endoquil e seus efeitos na liberação de citocinas e de óxido nítrico em culturas de macrófagos peritoniais murinos. As substâncias sofreram diluições de 1.000 e 10.000 vezes: Grupo Controle, meio de cultura meio McCoy`s 5A® modificado e apirogênico; Grupo Hipoclorito de sódio a 1% (diluições A 0,001 e B 0,0001); Grupo Digluconato de Clorexidina a 2% (diluições A 0,002 e B 0,0002); Grupo Endoquil a 10% (diluições A 0,01 e B 0,001). Foram utilizados 70 camundongos da linhagem C57Bl/6j fêmeas. Após anestesia e sacrifício realizou-se a coleta do exudato celular por meio da injeção e aspiração de meio McCoy`s 5A® modificado na cavidade abdominal dos animais. O ensaio da atividade citotóxica foi realizado pelo Método do MTT nos períodos: curto prazo (4 e 12 horas); médio prazo (24, 48 e 72 horas) e longo prazo (5 e 7 dias). A absorbância dos poços foi lida em Leitora de Elisa a 550 nm. Os valores obtidos foram comparados com os valores do padrão, calculando-se assim a viabilidade e o número de células presentes de cada grupo avaliado em função do tempo. A quantificação in vitro das citocinas IL-1...

Influência do uso do digluconato de clorexidina como inibidor de metaloproteinase na resistência adesiva e dureza da camada híbrida e camada de adesivo; The influence of the use of chlorhexidine gluconate as an inhibitor of metalloproteinase bond strength and hardness of the hybrid layer and adhesive layer

Lobo, Tamile Rocha da Silva
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 03/09/2013 PT
Relevância na Pesquisa
37.506357%
Este estudo avaliou a influência do uso do digluconato de clorexidina como inibidor de metaloproteinase na resistência adesiva e dureza da camada de adesivo e camada hibrida de uma resina composta à dentina humana, por meio de ensaio de microtração e nanoedentação. Os fatores de variação estudados foram dois sistemas adesivos com estratégias de aplicação distintas Adper Scotchbond Multi-Purpose (3M ESPE, St. Paul, MN, USA) e Clearfil SE Bond (Kuraray Co., Osaka, Japan), e ainda foram realizados tratamentos no substrato dentinário utilizando duas concentrações de digluconato de clorexidina sendo estas 2% e 0,2% e grupos controle sem tratamento com clorexidina. As unidades experimentais foram compostas por 48 molares humanos hígidos divididos aleatoriamente em 6 grupos (n=8). Nestes foram aplicados os procedimentos adesivos e realizados os tratamentos de superfície, com clorexidina, previamente aos procedimentos adesivos. Após esta etapa foram confeccionadas as restaurações com espessura de 5mm sobre as superfícies dentinárias. Após 24h de armazenamento em água destilada, os dentes restaurados foram cortados para a obtenção de corpos de prova em forma de palito, com secção transversal de aproximadamente 1mm2. De cada grupo foram selecionados aleatoriamente 5 palitos para o ensaio de dureza. O restante dos palitos viáveis de cada dente foram submetidos ao teste de microtração a uma velocidade de 0...

Chlorhexidine induces DNA damage in rat peripheral leukocytes and oral mucosal cells

Ribeiro, D. A.; Bazo, A. P.; Franchi, CAD; Marques, MEA; Salvadori, DMF
Fonte: Blackwell Munksgaard Publicador: Blackwell Munksgaard
Tipo: Artigo de Revista Científica Formato: 358-361
ENG
Relevância na Pesquisa
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Objective: Chlorhexidine digluconate is widely used in dental practice for decreasing plaque control, controlling gingivitis and disinfecting root canals. However, the undesirable effects of chlorhexidine digluconate regarding its genotoxicity are conflicting in the literature. Thus, the aim of this study was to investigate the genotoxicity of chlorhexidine digluconate in rat peripheral blood and oral mucosal cells by the single cell gel (comet) assay and micronucleus assay.Methods: Thirty male Wistar rats were distributed into three groups: negative control; experimental group orally treated with 0.5 ml of 0.12% chlorhexidine digluconate, twice daily, during 8 days; and positive control, which received 4-nitroquinoline 1-oxide at 0.5 g/l by drinking water.Results: A statistically significant increase of DNA damage was observed in leukocytes and oral mucosal cells of the chlorhexidine digluconate treated group, as assessed by the comet assay. However, no increase of micronucleated cells was detected in reticulocytes from peripheral blood cells.Conclusions: Taken together, the data indicate that chlorhexidine digluconate is able to induce primary DNA damage in leukocytes and in oral mucosal cells, but no chromosome breakage or loss in erythrocytes.

DNA damage in multiple organs after exposure to chlorhexidine in Wistar rats

Grassi, Tony F.; Camargo, Elaine A.; Salvadori, Daisy Maria Favero; Marques, M. E. A.; Ribeiro, Daniel A.
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 163-167
ENG
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Since chlorhexidine is effective against microorganisms, it is widely recommended in dentistry. However, studies have provided evidence that chlorhexidine is toxic for a variety of cell types. In order to identify potential genotoxins in different cell types, the purpose of this study was to investigate whether chlorhexidine digluconate is able to cause, in terms of DNA damage, alterations in leukocytes, liver, kidney and urinary bladder by the single cell gel (comet) assay. Ten male Wistar rats were divided into two groups: a negative control and the experimental group treated with 3 ml of 0.12% chlorhexidine digluconate by gavage once a day for 8 days. Statistically significant increases of DNA damage was observed in leukocytes and kidney cells of the chlorhexidine digluconate treated group as depicted by the mean tail moment. Taken together, the data indicate that leukocytes and kidney cells are potential targets for primary DNA damage following oral exposure to chlorhexidine digluconate as detected by single cell gel (comet) assay. (c) 2006 Elsevier GmbH. All rights reserved.

The influence of chlorhexidine on the severity of cyclosporin A-induced gingival overgrowth

Pilatti, G. L.; Sampaio, JEC
Fonte: Amer Acad Periodontology Publicador: Amer Acad Periodontology
Tipo: Artigo de Revista Científica Formato: 900-904
ENG
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THE INFLUENCE OF CHEMICAL PLAQUE CONTROL, using topically applied 0.12% chlorhexidine, on the severity of cyclosporin A (CsA)-induced gingival overgrowth (GO) was evaluated. Forty Holtzman rats were divided into four groups: 1) control; 2) cyclosporin A: a 10mg/kg/day subcutaneous dose of CsA; 3) chlorhexidine: 0.12% chlorhexidine (CHX) was applied to the buccal surface of the right mandibular molars; and 4) cyclosporin A/chlorhexidine: a combination of the treatment described for cyclosporin A and chlorhexidine groups. The animals were fed a high sucrose diet during the experiment and were sacrificed after 14 and 21 days. The histometric analysis revealed a significant increase in buccal gingival area in the cyclosporin A group compared to other groups (P < 0.01) after 21 days. The epithelium thickness of the buccal gingiva was significantly increased in the cyclosporin A group, compared to the control group (P < 0.05). The cyclosporin A/chlorhexidine group exhibited statistically significantly lower gingival overgrowth than the cyclosporin A group. These findings, if replicated in human studies, suggest that topically applied 0.12% chlorhexidine may be a valuable measure in the management of cyclosporin-induced gingival overgrowth.

Comparative study of the antimicrobial efficacy of chlorhexidine gel, chlorhexidine solution and sodium hypochlorite as endodontic irrigants

Ferraz,Caio C. R.; Gomes,Brenda P. F. A.; Zaia,Alexandre A.; Teixeira,Fabrício B.; Souza-Filho,Francisco J.
Fonte: Fundação Odontológica de Ribeirão Preto Publicador: Fundação Odontológica de Ribeirão Preto
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2007 EN
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The purpose of this study was to assess the in vitro the antimicrobial efficacy of chlorhexidine gluconate gel as an endodontic auxiliary chemical substance compared to sodium hypochlorite (NaOCl) and chlorhexidine gluconate solution. The antimicrobial efficacy of the tested substances was evaluated using the agar diffusion test. The growth inhibition zones produced by 0.2%, 1% and 2% chlorhexidine gel were evaluated against 5 facultative anaerobic bacteria and 4 pigmented Gram-negative anaerobes, and compared to the results obtained by NaOCl and chlorhexidine solution. The largest growth inhibition zones were produced when the test bacteria were in contact with 2% chlorhexidine gluconate gel (11.79 mm), being significantly different (p<0.05) from the growth inhibition zones produced by all NaOClconcentrations, including 5.25% (9.54 mm). However, there was no statistically significant difference (p>0.05) between the growth inhibition zones obtained with equal concentrations of chlorhexidine solution and gel. The results of this study indicate that, as far as its antimicrobial properties are concerned, chlorhexidine gel has a great potential to be used as an endodontic auxiliary chemical substance.

Efetividade da antissepsia bucal pr??via com clorexidina na preven????o da contamina????o da moldagem com alginato e sua influ??ncia na distor????o do material; Efectivity of a preprocedural mouthrinse with chlorhexidine in the microbial contamination of dental impressions and its influence on the material s distortion

CUBAS, Gloria Beatriz de Azevedo
Fonte: Universidade Federal de Pelotas; Odontologia; Programa de P??s-Gradua????o em Odontologia; UFPel; BR Publicador: Universidade Federal de Pelotas; Odontologia; Programa de P??s-Gradua????o em Odontologia; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
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The aims of this randomised controlled trial were to evaluate the influence of a preprocedural 0.12% chlorhexidine mouthrinse on the microbial contamination of dental impressions, subsequently disinfected with sodium hypoclorite or water (control). The second objective was to evaluate if aqueous solution of 0.12% chlorhexidine mixed with irreversible hydrocolloid powder would decrease microbial contamination of dental impressions. Forty subjects underwent maxillary dental impressions with irreversible hydrocolloid and were randomly divided into two groups (n=20) according to the preprocedural mouthrinse (0.12% chlorhexidine or placebo).The dental impressions were then divided into two subgroups and disinfected with sodium hypochlorite or water (control). In the second part, 20 subjects underwent maxillary dental impressions with irreversible hydrocolloid and randomly assigned into two groups according to the mixed agent used (0.12% chlorhexidine or water). Saliva and alginate samples were assessed for microbiological counts of total micro-organisms, total streptococci and Candida species. Surface roughness of the impressions and dimensional stability of the casts were also evaluated. Chlorhexidine preprocedural mouthrinse significantly reduced (p<0.05) microbial contamination. Small but significant alterations were produced on dimensional stability and surface quality when sodium hypochlorite was used as disinfectant after the impression (p=0.005). The results also showed that the use of aqueous 0.12% chlorhexidine mixed with the powder of irreversible hydrocolloid decreased the percentage of total micro-organisms and total Streptococci counts (p<0.001)...

Order and membrane organization in chlorhexidine-lipid mixtures /

Sadeghi, Sara.
Fonte: Brock University Publicador: Brock University
Tipo: Electronic Thesis or Dissertation
ENG
Relevância na Pesquisa
37.3429%
Formulations of a general bactericidal agent, chlorhexidine, mixed with a phospholipid at different concentrations are investigated using ^H NMR spectroscopy on a chain-deuterated lipid analog. Lipid-chlorhexidine formulation is known to release the drug into an aqueous medium slowly, maintaining a comparable concentration of the drug for up to four times longer than a direct aqueous solution. The NMR data does not support the proposed liposomal entrapment of chlorhexidine in lipid compartments. Complex thermal history of the lipid-chlorhexidine preparations is investigated in detail. In preparation for a counterpart measurement, using ^H NMR of deuterated chlorhexidine mixed with protonated lipid, the synthesis of a deuterated analog of chlorhexidine is performed.

Evaluation of the substantivity of chlorhexidine in association with sodium fluoride in vitro

Freitas,Carolina Saliba de; Diniz,Henrique França Oliveira; Gomes,Jânderson Breder; Sinisterra,Rubén Dário; Cortés,María Esperanza
Fonte: Sociedade Brasileira de Pesquisa Odontológica e Faculdade de Odontologia da Universidade de São Paulo Publicador: Sociedade Brasileira de Pesquisa Odontológica e Faculdade de Odontologia da Universidade de São Paulo
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2003 EN
Relevância na Pesquisa
37.405657%
The efficacy of the fluoride-chlorhexidine association in the prevention of gingivitis and caries has been advocated for a number of years5,7,14. The objective of the association of these therapeutic agents is a synergistic action. The aim of the present study was to determine the substantivity of chlorhexidine associated or not to sodium fluoride at different intervals of time, in vitro. Bovine enamel surfaces were treated with 0.12% chlorhexidine gluconate (Periogard® - Colgate®) or 0.05% sodium fluoride with 0.12% chlorhexidine (Duplak® - Dentsply®) solutions for one minute. Fragments were placed in distilled water and samples were collected at intervals of 5, 30 and 360 minutes and analyzed by spectrophotometry in the visible ultraviolet region. Substantivity was evaluated by the measurement of chlorhexidine desorption from the treated slabs. The mean values obtained were statistically analyzed by Student's t-test. The results showed that the concentration of chlorhexidine decreased when it was used in association with sodium fluoride. The difference between the groups was statistically significant (p < 0.05). These in vitro results suggest that the association between sodium fluoride and chlorhexidine in the studied concentrations appears to have no beneficial effect because of the decrease in the substantivity of chlorhexidine.

Evaluation of the substantivity of chlorhexidine in association with sodium fluoride in vitro; Avaliação da substantividade da clorexidina na associação com fluoreto de sódio in vitro

Freitas, Carolina Saliba de; Diniz, Henrique França Oliveira; Gomes, Jânderson Breder; Sinisterra, Rubén Dário; Cortés, María Esperanza
Fonte: Universidade de São Paulo. Faculdade de Odontologia Publicador: Universidade de São Paulo. Faculdade de Odontologia
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf
Publicado em 01/03/2003 ENG
Relevância na Pesquisa
37.405657%
The efficacy of the fluoride-chlorhexidine association in the prevention of gingivitis and caries has been advocated for a number of years5,7,14. The objective of the association of these therapeutic agents is a synergistic action. The aim of the present study was to determine the substantivity of chlorhexidine associated or not to sodium fluoride at different intervals of time, in vitro. Bovine enamel surfaces were treated with 0.12% chlorhexidine gluconate (Periogard® - Colgate®) or 0.05% sodium fluoride with 0.12% chlorhexidine (Duplak® - Dentsply®) solutions for one minute. Fragments were placed in distilled water and samples were collected at intervals of 5, 30 and 360 minutes and analyzed by spectrophotometry in the visible ultraviolet region. Substantivity was evaluated by the measurement of chlorhexidine desorption from the treated slabs. The mean values obtained were statistically analyzed by Student's t-test. The results showed that the concentration of chlorhexidine decreased when it was used in association with sodium fluoride. The difference between the groups was statistically significant (p < 0.05). These in vitro results suggest that the association between sodium fluoride and chlorhexidine in the studied concentrations appears to have no beneficial effect because of the decrease in the substantivity of chlorhexidine.; A efetividade da associação fluoreto-clorexidina na prevenção da gengivite e da cárie vem sendo defendida há alguns anos5...

; Antimicrobial activity of chlorhexidine in root canals instrumented with the ProTaper Universal™ System

Câmara, Andréa Cruz; Albuquerque, Miracy Muniz de; Aguiar, Carlos Menezes; Correia, Ana Cristina Regis de Barros
Fonte: UNICAMP/FOP Publicador: UNICAMP/FOP
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; Formato: application/pdf
Publicado em 18/11/2015 ENG
Relevância na Pesquisa
37.405657%
; Aim: The purpose of the present study was to evaluate the antimicrobial activity of 0.2%, 1%, and 2% chlorhexidine in root canals instrumented with the ProTaper Universal™ system. Methods: Fifty human mandibular premolar teeth were infected with a mixture of Candida albicans, Pseudomonas aeruginosa, Enterococcus faecalis and Staphylococcus aureus. The specimens were randomly divided into 5 groups with 10 root canals according to the irrigant used. All root canals were instrumented with the ProTaper Universal™ system. Assessment of the antimicrobial action of the irrigant was performed before, during, and after instrumentation. Data were analyzed statistically by Chi-squared test and the Fisher exact test at 5% significance level. Results: The 0.2% chlorhexidine solution was ineffective against all test microorganisms. The 1% chlorhexidine solution was effective in eliminating P. aeruginosa and C. albicans after the use of the F1 and F3 instruments, respectively. The 2% chlorhexidine solution was effective at killing S. aureus, P. aeruginosa and C. albicans after the use of the S1 instrument. There were statistically significant differences (p<0.05) between the concentrations of chlorhexidine and the instruments used. Conclusions: The 0.2% chlorhexidine solution in combination with rotary instrumentation was ineffective against all test microorganisms. The 1% chlorhexidine solution was ineffective against S. aureus and E. faecalis. The 2% chlorhexidine solution was not sufficient to inactivate E. faecalis.