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1.
J. appl. oral sci ; 28: e20190578, 2020. tab, graf
Article in English | LILACS, BBO | ID: biblio-1101256

ABSTRACT

Abstract Objective This study sought to analyze the gene expression of Candida albicans in sound root surface and root caries lesions, exploring its role in root caries pathogenesis. Methodology The differential gene expression of C. albicans and the specific genes related to cariogenic traits were studied in association with samples of biofilm collected from exposed sound root surface (SRS, n=10) and from biofilm and carious dentin of active root carious lesions (RC, n=9). The total microbial RNA was extracted, and the cDNA libraries were prepared and sequenced on the Illumina Hi-Seq2500. Unique reads were mapped to 163 oral microbial reference genomes including two chromosomes of C. albicans SC5314 (14,217 genes). The putative presence of C. albicans was estimated (sum of reads/total number of genes≥1) in each sample. Count data were normalized (using the DESeq method package) to analyze differential gene expression (using the DESeq2R package) applying the Benjamini-Hochberg correction (FDR<0.05). Results Two genes (CaO19.610, FDR=0.009; CaO19.2506, FDR=0.018) were up-regulated on SRS, and their functions are related to biofilm formation. Seven genes ( UTP20 , FDR=0.018; ITR1 , FDR=0.036; DHN6 , FDR=0.046; CaO19.7197 , FDR=0.046; CaO19.7838 , FDR=0.046; STT4 , FDR=0.046; GUT1 , FDR=0.046) were up-regulated on RC and their functions are related to metabolic activity, sugar transport, stress tolerance, invasion and pH regulation. The use of alternative carbon sources, including lactate, and the ability to form hypha may be a unique trait of C. albicans influencing biofilm virulence. Conclusions C. albicans is metabolically active in SRS and RC biofilm, with different roles in health and disease.


Subject(s)
Humans , Tooth Root/microbiology , Candida albicans/genetics , DNA, Fungal/genetics , Root Caries/microbiology , Biofilms/growth & development , Candida albicans/isolation & purification , Candida albicans/growth & development , Gene Expression , Gene Expression Regulation, Fungal , Up-Regulation , Sequence Analysis, RNA , Transcriptome , Morphogenesis
2.
Rev. cuba. estomatol ; 55(4): 1-11, oct.-dic. 2018. tab
Article in Portuguese | LILACS | ID: biblio-991078

ABSTRACT

Introdução: O uso contínuo das próteses removíveis e a higiene inadequada das mesmas podem levar ao desenvolvimento da estomatite protética. Doença frequente em usuários de próteses e muito associada à Candida spp. Objetivo: determinar características sociais e os cuidados dos indivíduos com a higienização das próteses dentárias removíveis, assim como a presença de espécies de Candida em usuários de próteses numa comunidade do município de Cabedelo, Paraíba, Brasil. Métodos: Tratou-se de um estudo piloto, transversal, observacional e laboratorial com a avaliação de 14 voluntários. Foram utilizados formulários de investigação e realizada a coleta, o isolamento e identificação do material biológico. Resultados: Os participantes da pesquisa apresentaram renda e escolaridade baixas. A higiene diária das próteses, a escovação com dentifrício, a não remoção das próteses para dormir e a utilização das mesmas por mais de seis anos foram verificadas na maior parte da amostra. Conclusão: Demonstrou-se uma alta presença de Candida spp. nos usuários de próteses dentárias removíveis e Candida albicans foi a espécie mais prevalente(AU)


Introducción: El uso continuo de las prótesis removibles y la higiene inadecuada de estas pueden conducir al desarrollo de la estomatitis protésica, enfermedad frecuente en usuarios de prótesis y muy asociada a la Candida spp. Objetivo: determinar las características sociales y los cuidados de los individuos con la higienización de las prótesis dentales removibles, así como la presencia de especies de Candida en usuarios de prótesis en una comunidad del municipio de Cabedelo, Paraíba, Brasil. Métodos: Se trata de un estudio piloto, transversal, observacional y de laboratorio con la evaluación de 14 voluntarios. Se utilizaron formularios de investigación y se realizó la recolección, el aislamiento e identificación del material biológico. Resultados: Los participantes de la encuesta presentaron ingresos y escolaridad bajos. La higiene diaria de las prótesis, el cepillado con dentífrico, la no remoción de las prótesis para dormir y la utilización de estas durante más de seis años se verificaron en la mayor parte de la muestra. Conclusión: Se demostró una alta presencia de Candida spp. en los usuarios de prótesis dentales removibles y Candida albicans fue la especie que más predominó(AU)


Introduction : The continued use of dentures and inadequate hygiene may lead to the development of denture stomatitis, a frequent disease in patients who wear dentures and very much associated with Candida spp. Objective : To determine the social characteristics and the care of the individuals with the hygiene of their dentures, as well as the presence of Candida species in patients who wear dentures from a community of Cabedelo Municipality, Paraíba, Brazil. Methods : This is a pilot, cross-sectional, observational and laboratory study with the evaluation of 14 volunteers. Research forms were used and the collection, isolation and identification of the biological material were carried out. Results : The participants had low income and schooling. The daily hygiene of the prostheses, brushing with dentifrice, the non-removal of the prosthesis for sleeping and their use for more than six years were verified in most of the sample. Conclusions : A high presence of Candida spp. in the patients who wear dentures was shown, while C. albicans was the most prevalent species(AU)


Subject(s)
Humans , Oral Hygiene/statistics & numerical data , Stomatitis/etiology , Candida/isolation & purification , Denture, Partial, Removable/adverse effects , Candida albicans/isolation & purification , Pilot Projects , Cross-Sectional Studies , Observational Study
3.
Rev. chil. infectol ; 35(4): 377-385, ago. 2018. tab
Article in Spanish | LILACS | ID: biblio-978048

ABSTRACT

Resumen Introducción: Se desconocen los factores asociados a la candidiasis oral en población pediátrica con infección por VIH de los países en desarrollo. Objetivo: Identificar los factores asociados a la colonización por Candida, candidiasis oral y la susceptibilidad in vitro a antifúngicos, en niños y adolescentes con infección por VIH institucionalizados en la ciudad de Tijuana, México. Materiales y Métodos: Se examinó la cavidad oral de 30 niños y adolescentes con infección por VIH, se obtuvo una muestra de la mucosa oral para identificar las especies de Candida mediante cultivo y auxonograma. La susceptibilidad a los antifúngicos se determinó de acuerdo al CLSI. Los indicadores del estado inmunológico y falla virológica se clasificaron conforme a la OMS. Resultados: Se identificaron seis especies de Candida, 53% colonizantes y 47% causantes de candidiasis. Los factores asociados a candidiasis fueron alta carga viral (p = 0,001), menor recuento de LTCD4+ (p = 0,002) y esquema TARAA (p ≤ 0,014). La especie prevalente fue C. glabrata (33%); sin embargo, C. albicans (27%) fue más resistente a fluconazol (p = 0,001). Las especies resistentes a itraconazol se identificaron en esquemas que incluyen un INNTR (p = 0,041). Conclusiones: Los niños y adolescentes con infección por VIH institucionalizados mostraron una prevalencia elevada de Candida spp. colonizante y resistencia a los antifúngicos relacionada con los INNTR .


Background: Factors associated with candidiasis and colonization in HIV-positive children and adolescents in developing countries are not well understood. Aim: To identify the factors associated with oral Candida colonization and candidiasis in institutionalized HIV-positive children and adolescents in Tijuana, México, as well as the response of the isolates to antifungals. Materials and Methods: Sample of the oral mucosa of 30 HIV positive children and adolescents were obtained to isolate and identify Candida species by culture and metabolic profile. Antifungal drugs susceptibility was determined according to CLSI. Indicators of immunological and virologic failure were classified in accordance to WHO criteria. Results: Six Candida species were identified from oral mucosa, 53% colonizers and 47% in candidiasis. Factors associated with candidiasis and oral colonization were viral load (p = 0,001), CD4+ counts (p = 0,002) and HAART regimen (p ≤ 0,014). The most prevalent species was C. glabrata (33%), but C. albicans (27%) was more resistant to fluconazole (p = 0,001). Itraconazol resistant species were identified in regimens that include an NNRTI (p = 0,041). Conclusion: HIV-positive children and adolescents living in an orphanage showed high prevalence of colonizing Candida spp. and resistance to antifungals, related to NNRTI.


Subject(s)
Humans , Male , Female , Infant , Child, Preschool , Child , Adolescent , Adult , Young Adult , Candida albicans/isolation & purification , Candidiasis, Oral/microbiology , HIV Infections/complications , AIDS-Related Opportunistic Infections/microbiology , Mouth Mucosa/microbiology , Candida albicans/classification , Candidiasis, Oral/classification , Candidiasis, Oral/drug therapy , Fluconazole/therapeutic use , HIV Infections/drug therapy , Cross-Sectional Studies , Prospective Studies , Risk Factors , AIDS-Related Opportunistic Infections/drug therapy , Itraconazole/therapeutic use , Viral Load , Drug Resistance, Fungal , Mexico , Antifungal Agents/therapeutic use
4.
Braz. j. otorhinolaryngol. (Impr.) ; 84(4): 404-409, July-Aug. 2018. tab
Article in English | LILACS | ID: biblio-951858

ABSTRACT

Abstract Introduction Otomycosis is a common diseases that can be associated with many complications including involvement of the inner ear and mortality in rare cases. Management of otomycosis can be challenging, and requires a close follow-up. Treatment options for otomycosis include local debridement, local and systemic antifungal agents and utilization of topical antiseptics. Objective This study was designed to compare the recovery rate of otomycosis using two therapeutic methods; topical betadine (Povidone-iodine) and clotrimazole. Methods In this single-blind clinical trial, 204 patients with otomycosis were selected using a non-probability convenient sampling method and were randomly assigned to two treatment groups of topical betadine and clotrimazole (102 patients in each group). Response to treatment was assessed at 4, 10 and 20 days after treatment. Data were analyzed using the independent t-test, Chi-Square and Fisher exact test in SPSS v.18 software, at a significance level of p < 0.05. Results The results showed that out of 204 patients with otomycosis, fungi type isolated included Aspergillus in 151 cases (74%), and Candida albicans in 53 patients (26%). On the fourth day after treatment, 13 patients (13.1%) in the group treated with betadine and 10 patients (9.8%) in the group treated with clotrimazole showed a good clinical response to treatment (p = 0.75). A good response to treatment was reported for 44 (43.1%) and 47 patients (46.1%) on the tenth day after the treatment (p = 0.85); and 70 (68.6%) and 68 patients (67.6%) on the twentieth day after treatment (p = 0.46) in the groups treated with betadine and clotrimazole, respectively. The response to treatment was thus not significantly different in the two groups. Conclusion In the present study the efficacy of betadine and clotrimazole was the same for the treatment of otomycosis. The result of this study supports the use of betadine as an effective antifungal in otomycosis treatment, helping to avoid the emergence of resistant organisms.


Resumo Introdução A otomicose é uma das doenças comuns associadas a muitas complicações, como envolvimento da orelha interna e mortalidade em casos raros. O tratamento da otomicose pode ser realmente desafiador e requer um acompanhamento rigoroso. As opções de tratamento para otomicose podem incluir desbridamento local, agentes antifúngicos locais e sistêmicos e uso de antissépticos tópicos, os medicamentos tópicos recomendados para o tratamento da otomicose. Objetivo Comparar a taxa de recuperação de otomicose utilizando dois métodos terapêuticos de betadina tópica (povidona-iodo) e clotrimazol. Método Neste ensaio clínico simples cego, 204 pacientes com otomicose foram selecionados utilizando-se método de amostragem de não probabilidade conveniente e randomizados para dois grupos de tratamento, com betadina tópica e com clotrimazol (102 pacientes em cada grupo). A resposta ao tratamento foi avaliada aos 4, 10 e 20 dias após o tratamento. Os dados foram analisados utilizando o teste t independente, qui-quadrado e teste de Fisher no software SPSS v.18, com nível de significância de p < 0,05. Resultados Os resultados mostraram que dos 204 pacientes com otomicose, os tipos de fungos isolados incluíram Aspergillus em 151 casos (74%) e Candida albicans em 53 pacientes (26%). No quarto dia após o tratamento, 13 pacientes (13,1%) no grupo tratado com betadina e 10 pacientes (9,8%) no grupo tratado com clotrimazol apresentaram boa resposta ao tratamento (p = 0,75). Uma boa resposta ao tratamento foi relatada para 44 (43,1%) e 47 pacientes (46,1%) no décimo dia após o tratamento (p = 0,85); e 70 (68,6%) e 68 pacientes (67,6%) no vigésimo dia após o tratamento (p = 0,46) no grupo tratado com betadina e clotrimazol, respectivamente. Assim, a resposta ao tratamento não foi significativamente diferente nos dois grupos. Conclusão No presente estudo, a eficácia da betadina e do clotrimazol foi a mesma no tratamento da otomicose. O resultado deste estudo apoia o uso de betadina como um antifúngico eficaz no tratamento da otomicose que pode ajudar a evitar o surgimento de organismos resistentes.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Young Adult , Povidone-Iodine/administration & dosage , Clotrimazole/administration & dosage , Otomycosis/drug therapy , Anti-Infective Agents, Local/administration & dosage , Antifungal Agents/administration & dosage , Aspergillus/isolation & purification , Time Factors , Administration, Cutaneous , Candida albicans/isolation & purification , Single-Blind Method , Reproducibility of Results , Treatment Outcome
5.
Rev. otorrinolaringol. cir. cabeza cuello ; 78(1): 36-42, mar. 2018. tab, graf, ilus
Article in Spanish | LILACS | ID: biblio-902812

ABSTRACT

RESUMEN Introducción: La otomicosis en pacientes inmunosuprimidos esta caracterizada por ser bilateral y ser causada por candida. Pocos estudios comparan las características micológicas encontradas en la microscopía directa y el cultivo. Objetivo: Identificar las características clínicas y micológicas de la otomicosis en pacientes diabéticos. Material y método: Estudio transversal en centro hospitalario de segundo nivel. Criterios de inclusión: pacientes diabéticos con diagnóstico clínico de otomicosis. Intervención: la muestra se examinó directamente bajo el microscopio y se cultivó. Resultados: Se incluyeron 17 pacientes, 10 mujeres y 7 hombres con una edad media de 47,5 años. Los síntomas predominantes fueron hipoacusia en 91,4% (n =16), prurito en 82,4% (n =14), otorrea en 76,5% (n=13)y otalgia en 70,6% (n =12). Afección bilateral se encontró en 47,1% (n =8). Estudio directo al microscopio mostró levaduras en 94,1% (n =16) y 5,9% mostró aspergillus (n =1). Cándida fue el género más comúnmente encontrado en los cultivos y en el examen directo microscópico con 94,1% (n =16) y Candida albicans la especie más común con 88,2% (n =15). Conclusión: Candida albicans es el agente etiológico más común en pacientes diabéticos con otomicosis. Su presentación clínica más frecuente es hipoacusia, prurito y otorrea. El examen directo identificó adecuadamente a los géneros fúngicos.


ABSTRACT Introduction: Otomycosis in immunocompromised patients is characterize by its bilateral course and the predominant etiologic agent is Candida. Few studies compare the mycological features between microscopic direct exam and culture. Aim: To identify the clinical and mycological characteristics of otomycosis in diabetic patients. Material and method: Transversal study. Secondary care center. Inclusion criteria: diabetic patients with clinical diagnosis of otomycosis. Intervention: Direct examination under a microscope of the ear sample and culture. Results: We included 17 patients, 10 women, 7 men with a mean age of 47.5 years. Symptoms were hearing loss 94.1% (n = 16), pruritus 82.4% (n =14) otorrhoea 76.5% (n =13) and otalgia 70.6% (n =12). Bilateral involvement was found in 47.1% (n =8). Direct microscopic study found 94.1% of yeast (n =16) and 5.9% of Aspergillus (n =1). Candida was the most common fungal genus in culture and microscopic exam with 94.1% (n =16) of cases and Candida albicans was the most common species in 88.2% (n =15) cases. Conclusion: Candida albicans is the most common etiologic agent in diabetic patients with otomycosis. Main symptoms were hearing loss, itching and otorrhea. Direct exam correctly identified the fungal genus.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Aged , Diabetes Complications/microbiology , Otomycosis/microbiology , Aspergillus fumigatus/isolation & purification , Seasons , Time Factors , Opportunistic Infections , Candida albicans/isolation & purification , Clinical Evolution , Cross-Sectional Studies , Candida glabrata/isolation & purification , Diabetes Complications/epidemiology , Otomycosis/epidemiology
6.
J. appl. oral sci ; 26: e20170077, 2018. tab, graf
Article in English | LILACS | ID: biblio-893728

ABSTRACT

Abstract Objective Although the effectiveness of chemical cleansing against Candida albicans biofilm has been shown, the effective concentration of denture cleanser tablets has not been studied. The aim of this study was to assess the effect of three denture materials against Candida albicans biofilm and to determine effective concentrations of denture cleanser tablets. Material and methods The surface-roughness of Acron-hi™, QC-20™ and Deflex™ (n=45 per resin) resins was standardized by using a profilometer and their contact angle or surface free energy was calculated. C. albicans biofilm was formed on all three resins and were treated with Polident 3 min™, Corega™ and Fittydent™ cleanser solutions at various concentrations and both resin-biofilm and cleanser-biofilm interest were determined by using a MTT protocol according to the European Committee on Antimicrobial Susceptibility Testing's antifungal susceptibility testing (AFST-EUCAST). Scanning electron microscopy was used to compare the efficacy of different resin materials against C. albicans biofilm. Anticandidal activity and surface free energy statistical parameters were calculated by using 3-way and 1-way ANOVA, respectively (p<0.05). Results Polident 3 min™ and Corega™ tablets significantly inhibited (p<0.05) the proliferation of C. albicans against all denture resins at 27-37 mg/mL. Scanning electron microscopy results indicated that there was no significant difference among resin specimens regarding biofilm formation on dentures. We failed to find a significant relationship between surface free energy and the anticandidal effect of resin types. However, the polarity value of the resins was statistically associated with their anticandidal activity. Conclusions The polarity of the resins, the concentrations of tablets and the chemical content of the cleanser may directly affect C. albicans biofilm formations. Polident 3 min™ and Corega™ tablets should be suggested for patients who use any denture resin types, whereas the Fittydent™ tablet should only be proposed for those who use Deflex™, when two tablets are dropped into 150 mL water.


Subject(s)
Sulfates , Borates , Candida albicans/drug effects , Dental Cements , Denture Bases/microbiology , Denture Cleansers/pharmacology , Antifungal Agents/pharmacology , Polyvinyls , Surface Properties , Tablets , Materials Testing , Candida albicans/isolation & purification , Microscopy, Electron, Scanning , Colony Count, Microbial , Microbial Sensitivity Tests , Analysis of Variance , Biofilms/drug effects , Polymethyl Methacrylate
7.
J. appl. oral sci ; 25(3): 274-281, May-June 2017. tab, graf
Article in English | LILACS | ID: biblio-893617

ABSTRACT

Abstract Pulpal and periodontal tissues have similar microbiota that allows cross-contamination between the pulp and periodontal tissues. Objective The aim of this study was to investigate the prevalence of isolated Candida albicans from periodontal endodontic lesions in diabetic and normoglycemic patients, and the fungi's virulence in different atmospheric conditions. Material and Methods A case-control study was conducted on 15 patients with type 2 diabetes mellitus (G1) and 15 non-diabetics (G2) with periodontal endodontic lesions. Samples of root canals and periodontal pockets were plated on CHROMagar for later identification by polymerase chain reaction (PCR) and virulence test. Results C. albicans was identified in 79.2% and 20.8% of the 60 samples collected from diabetic and normoglycemic patients, respectively. Of the 30 samples collected from periodontal pockets, 13 showed a positive culture for C. albicans, with 77% belonging to G1 and 23% to G2. Of the 11 positive samples from root canals, 82% were from G1 and 18% from G2. Production of proteinase presented a precipitation zone Pz<0.63 of 100% in G1 and 72% in G2, in redox and negative (Pz=1), under anaerobic conditions in both groups. Hydrophobicity of the strains from G1 indicated 16.4% with low, 19.3% with moderate, and 64.3% with high hydrophobicity in redox. In G2, 42.2% had low, 39.8% had moderate, 18% had high hydrophobicity in redox. In anaerobic conditions, G1 showed 15.2% with low, 12.8% with moderate, and 72% with high hydrophobicity; in G2, 33.6% had low, 28.8% had moderate, and 37.6% had high hydrophobicity. There was statistical difference in the number of positive cultures between G1 and G2 (p<0.05) with predominance in G1. There was statistical difference for all virulence factors, except hemolysis (p=0.001). Conclusions Candida albicans was isolated more frequently and had higher virulence in diabetic patients.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Aged , Periodontal Diseases/microbiology , Candida albicans/isolation & purification , Candida albicans/pathogenicity , Dental Pulp Diseases/microbiology , Diabetes Mellitus, Type 2/microbiology , Oxidation-Reduction , Peptide Hydrolases/analysis , Periodontal Diseases/physiopathology , Periodontal Diseases/diagnostic imaging , Periodontal Pocket/microbiology , Phospholipases/analysis , Virulence , DNA, Fungal , Radiography, Dental , Case-Control Studies , Polymerase Chain Reaction , Statistics, Nonparametric , Dental Pulp Cavity/microbiology , Dental Pulp Diseases/physiopathology , Dental Pulp Diseases/diagnostic imaging , Diabetes Mellitus, Type 2/physiopathology , Electrophoresis , Hydrophobic and Hydrophilic Interactions
8.
J. appl. oral sci ; 25(3): 265-273, May-June 2017. tab, graf
Article in English | LILACS | ID: biblio-893620

ABSTRACT

Abstract Elderly denture wearers are commonly affected by Candida-associated denture stomatitis (DS), an inflammatory process of the oral mucosa strongly associated with Candida spp and other microorganisms, as well as local and systemic factors. The impaired immune response against pathogens is among the inherent host factors that have been also associated with the pathogenesis of DS. Mononuclear phagocytes respond to the pathogens through phagocytosis followed by the production of several substances inside the phagosomes, among them are the reactive nitrogen species (RNS). A failure in these mechanisms may contribute to the DS development. Objective The aim of this study was to investigate the influence of aging on the internalization and the production of nitric oxide (NO) by peritoneal adherent cells (PAC), in response to Candida albicans (C. albicans). Material and methods PAC obtained from young and aged mice were challenged with dead or viable C. albicans by using predetermined proportions (cells:yeast) for 30 and 120 minutes. Phagocytosis was analyzed by acridine orange dye, and NO production by the Griess reaction. Results C. albicans phagocytosis by PAC from aged mice was similar to that of young mice, although the cells from older mice cells present more internalized fungi compared with matched control. In addition, a tendency towards impaired NO production by peritoneal mononuclear phagocytes from aged mice was observed. Conclusions PAC from aged mice may capture and store many fungi, which in turn may mean that these cells are effectively unable to eliminate fungi, probably due to impaired NO production. Therefore, considering the important role of C. albicans overgrowth in the pathogenesis of DS and the aspects observed in this study, aging may favor the onset and severity of local candidosis such as DS and its systemic forms.


Subject(s)
Animals , Male , Phagocytosis/physiology , Stomatitis, Denture/metabolism , Stomatitis, Denture/microbiology , Candida albicans/pathogenicity , Aging/physiology , Cell Adhesion/physiology , Nitric Oxide/biosynthesis , Peritoneum/cytology , Reference Values , Time Factors , Candida albicans/isolation & purification , Candidiasis/microbiology , Age Factors , Mice, Inbred C57BL , Nitric Oxide/analysis
9.
Rev. ADM ; 74(2): 74-78, mar.-abr. 2017. ilus
Article in Spanish | LILACS | ID: biblio-869357

ABSTRACT

La candidiasis es la infección micótica más común de la cavidad bucaly es causada por el hongo Candida. Dentro de la población geriátricala candidiasis oral es uno de los tres principales motivos de consulta. El crecimiento en superfi cies es parte natural del modo de vivir del hongo Candida y es común que colonice las prótesis dentales, dando como resultado estomatitis por uso de dentadura o estomatitis subplaca.El diagnóstico de estomatitis por dentadura es relevante, ya quealrededor de 50 por ciento de las personas de edad promedio de 65 a 74 años, y 70 por ciento de 75 a 84 años utilizan prótesis dentales removibles. El objetivo del presente estudio fue determinar la frecuencia de candidiasis oral asociada a prótesis dentales removibles en los pacientes de la ClínicaOdontológica de la Universidad Anáhuac México Norte durante el periodo enero-mayo de 2016. Material y métodos: Se realizó un estudiodescriptivo, transversal y observacional. La muestra estuvo conformada por pacientes portadores de prótesis dentales removibles que acudieron a la Clínica Odontológica de la Universidad Anáhuac México Norte.Se interrogó al paciente respecto al uso de la prótesis y su condición de salud, posterior a la exploración clínica se tomó la citología exfoliativa de la mucosa debajo de la prótesis removible. Resultados: La muestraestuvo constituida por 22 pacientes de la clínica de prótesis removible,seis eran portadores de prótesis, de éstos 83 por ciento fueron positivos a candidiasis. Conclusiones: La falta de indicaciones sobre el cuidado, uso ehigiene de las prótesis dentales o la falta de apego a estas indicacionespor parte del paciente ocasionan el desarrollo de estomatitis subplaca.


Candidiasis is the most common mycotic infection in oral cavity andcaused by fungi candid. Oral candidiasis is one of three principalreasons for consultation in a geriatric population. A natural part of theway of living of the fungi Candida is the growth on surfaces. It growthmakes common that the fungi Candida colonize the dental prostheses,so the denture stomatitis or dental-related stomatitis is development.Denture stomatitis diagnosis is quite important because from the totalpopulation using dental removable prostheses around of 50% is between65-74 years old and 70% is between 75-84 years old. The ofthis study was identifying oral candidiasis frequency related to dentalremovable prostheses in patients from Universidad Anahuac, DentalSchool (México Norte), from January 2016 to May 2016. Material andmethods: Was made a descriptive, cross and observational study. Thesample was integrated by patients using dental removable prostheses,who went to Universidad Anahuac’s dental school (México Norte). Thepatients were interrogated about dental removable prostheses use andtheir health condition, after clinic exploration and exfoliative cytologywas taken from mucosa below dental removable prostheses. Results: 22patients from dental service using removable prosthesis constituted thesample, from this 22 patients only 6 were using a removable prosthesisand from this 6 patients only 83% were positive to oral candidiasis.Conclusions: Instructions scare about care, use, and hygiene of dentalprosthesis as well as not follow these instructions for patient’s partmake possible denture stomatitis development.


Subject(s)
Humans , Male , Adult , Female , Middle Aged , Candidiasis, Oral/epidemiology , Candidiasis, Oral/etiology , Denture, Partial, Removable/adverse effects , Stomatitis, Denture/diagnosis , Stomatitis, Denture/pathology , Age and Sex Distribution , Cross-Sectional Studies , Candida albicans/isolation & purification , Candida albicans/growth & development , Epidemiology, Descriptive , Schools, Dental/standards , Mexico , Observational Studies as Topic , Statistical Analysis , Cytological Techniques/methods
10.
Braz. oral res. (Online) ; 31: e38, 2017. tab
Article in English | LILACS | ID: biblio-839532

ABSTRACT

Abstract The aim of this study was to detect possible associations between respiratory pathogens from tracheal aspirate and oral biofilm samples in intubated patients in an intensive care unit (ICU), and to identify the most common respiratory pathogens in oral biofilm, particularly in patients that developed ventilator-associated pneumonia (VAP). Two oral biofilm samples were collected from the tongue of intubated patients (at admission and after 48 hours) and analyzed by culture with the Antibiotic Sensitivity Test. The results from the tongue biofilm samples were compared with the tracheal secretions samples. A total of 59.37% of patients exhibited the same species of pathogens in their tracheal aspirate and oral biofilm, of which 8 (42.1%) developed VAP, 10 (52.63%) did not develop pneumonia and one (5.26%) had aspiration pneumonia. There was a statistically significant association between presence of microorganisms in the tracheal and mouth samples for the following pathogens: Klebsiella pneumoniae, Candida albicans, Pseudomonas aeruginosa, Enterobacter gergoviae, Streptococcus spp and Serratia marcescens (p < 0.05). Pathogens that are present in tracheal aspirates of intubated patients can be detected in their oral cavity, especially in those who developed VAP or aspiration pneumonia. Thus, the results indicate that an improved oral care in these patients could decrease ICU pneumonia rates.


Subject(s)
Humans , Male , Female , Middle Aged , Bacteria/isolation & purification , Biofilms , Mouth/microbiology , Pneumonia, Ventilator-Associated/microbiology , Trachea/microbiology , Ventilators, Mechanical/microbiology , Candida albicans/isolation & purification , Dental Plaque/microbiology , Equipment Contamination , Intensive Care Units , Intubation, Intratracheal/adverse effects , Longitudinal Studies , Microbial Sensitivity Tests , Pneumonia, Aspiration/microbiology , Respiration, Artificial/adverse effects , Time Factors
11.
Article in English | LILACS | ID: biblio-842772

ABSTRACT

ABSTRACT The aim of this study was to assess a collection of yeasts to verify the presence of Candida dubliniensis among strains isolated from the oral mucosa of AIDS pediatric patients which were initially characterized as Candida albicans by the traditional phenotypic method, as well as to evaluate the main phenotypic methods used in the discrimination between the two species and confirm the identification through genotypic techniques, i.e., DNA sequencing. Twenty-nine samples of C. albicans isolated from this population and kept in a fungi collection were evaluated and re-characterized. In order to differentiate the two species, phenotypic tests (Thermotolerance tests, Chromogenic medium, Staib agar, Tobacco agar, Hypertonic medium) were performed and genotypic techniques using DNA sequencing were employed for confirmation of isolated species. Susceptibility and specificity were calculated for each test. No phenotypic test alone was sufficient to provide definitive identification of C. dubliniensis or C. albicans, as opposed to results of molecular tests. After amplification and sequencing of specific regions of the 29 studied strains, 93.1% of the isolates were identified as C. albicans and 6.9% as C. dubliniensis. The Staib agar assay showed a higher susceptibility (96.3%) in comparison with other phenotypic techniques. Therefore, genotypic methods are indispensable for the conclusive identification and differentiation between these species.


Subject(s)
Humans , Child , AIDS-Related Opportunistic Infections/microbiology , Candida/genetics , Candidiasis, Oral/microbiology , DNA, Fungal/genetics , Candida albicans/genetics , Candida albicans/isolation & purification , Candida/classification , Candida/isolation & purification , Genotype , Mouth Mucosa/microbiology , Mycological Typing Techniques , Phenotype , Polymerase Chain Reaction
12.
Rev. Fundac. Juan Jose Carraro ; 22(42): 36-40, 2017. ilus, graf
Article in Spanish | LILACS | ID: biblio-908169

ABSTRACT

Objetivo: evaluar el nivel de contaminación por Candida spp, post uso del instrumental de ortodoncia que se utiliza intrabucalmente en pacientesColombianos y Argentinos. Materiales y métodos: Se incluyeron pacientesentre 16 y 65 años, de ambos sexos, con armado de brackets superior e inferior. Criterios de Exclusión: pacientes con brackets de autoligado, con enfermedades autoinmunes, con enfermedades sistémicas con manifestaciones en el periodonto, pacientes fumadores, menores de 16 años y con armado de brackets en un solo maxilar. Se analizaron los alicates de corte distal Hu Friedy luego de ser utilizados para seccionar el arco por distal del último tubo presente enboca. Se estudiaron 80 pacientes agrupados en: Grupo A 40 pacientesColombianos, Grupo B 40 pacientes argentinos. Se realizó una primer tomaintrabucal con un hisopo estéril y se llevó a un tubo con medio de Stuart. Se cortaron las 4 secciones distales de los arcos en boca tardando al menos 1 minuto. Con un segundo hisopo estéril se frota toda la superficie del alicate post uso y se llevaron a otro tubo. Se sembraron en Chromagar Candida y se realizaron pruebas microbiológicas convencionales. Resultados: Las pinzas estériles aparecen contaminadas post corte distal delos alambres en el 95% de los casos en ambos países. Hubo diferencia entrelos pacientes colombianos y los argentinos respecto a las especies, ya que enlos primeros la especie con mayor prevalencia fue Candida tropicalis tanto en lapinza como en la cavidad bucal, mientras que en los argentinos fue Candidaalbicans. Conclusión: las pinzas de ortodoncias se contaminan con Candidaspp post utilización en boca y son un fómite a partir del cual puede generarsediseminación sistémica así como infección cruzada.


Subject(s)
Male , Female , Humans , Adolescent , Adult , Young Adult , Middle Aged , Candida albicans/isolation & purification , Candida tropicalis/isolation & purification , Dental Instruments/adverse effects , Dental Instruments/microbiology , Orthodontic Brackets/adverse effects , Orthodontic Brackets/microbiology , Argentina , Colombia , Culture Media , Equipment Contamination/statistics & numerical data , Fomites , Statistical Analysis
13.
Braz. J. Pharm. Sci. (Online) ; 53(1): e15239, 2017. tab, graf
Article in English | LILACS | ID: biblio-839464

ABSTRACT

Abstract Dramatically increased occurrence of both superficial and invasive fungal infections has been observed. Candida albicans appear to be the main etiological agent of invasive fungal infections. The anti-C. albicans activity of thiosemicarbazide, 1,3,4-Thiadiazole, and 1,2,4-triazole-3(4H)-thione compounds (compounds 3-23) were investigated. The MIC values of thiadiazole and triazole derivatives 10-23 were in the range of 0.08-0.17 µmol mL-1, while that of fluconazole was 0.052 µmol mL-1. Compound 11 (5-(2-(4-chlorobenzyloxy)phenyl)-N-allyl-1,3,4-thiadiazol-2-amine) and compound 18 (5-(2-(4-chlorobenzyloxy)phenyl)-4-allyl-2H-1,2,4-triazole-3(4H)-thione) were found to be the most active compounds, with MIC values of 0.08 µmol mL-1. The newly synthesized thiadiazole and triazole compounds (compounds 10-23) showed promising anti-Candida activity. The allyl substituent-bearing compounds 11 and 18 exhibited significant anti-Candida albicans activity and showed a binding mode as well as the fluconazole x-ray structure.


Subject(s)
Thiadiazoles/chemical synthesis , Triazoles/chemical synthesis , Candida albicans/isolation & purification , Salicylates/pharmacology , Molecular Docking Simulation , Invasive Fungal Infections/prevention & control
14.
Rev. cuba. med. trop ; 68(3): 248-254, sep.-dic. 2016. ilus
Article in Spanish | LILACS, CUMED | ID: biblio-1042913

ABSTRACT

Introducción: la vulvovaginitis constituye una de las principales afecciones ginecológicas, y su causa más frecuente es la candidiasis. Candida albicans se considera el agente etiológico más importante de esta entidad; sin embargo, estudios recientes revelan un incremento en la incidencia de otras especies del género. Algunas de estas tienen la particularidad de presentar resistencia a los tratamientos usuales con antimicóticos. Objetivo: evaluar la susceptibilidad antifúngica de aislados vaginales de pacientes cubanas con sospecha de candidiasis vulvovaginal que se obtuvieron en el 2015. Métodos: a 28 aislados pertenecientes al género Candida, se les realizó las pruebas de susceptibilidad in vitro con la galería ATBTM Fungus 3 frente a diferentes antifúngicos (5-fluorocitosina, anfotericina B, fluconazol, itraconazol y voriconazol). Resultados: todos los aislados fueron sensibles a la anfotericina B y uno de C. albicans se informó resistente a los azoles estudiados. Todas las especies diferentes de C. albicans fueron susceptibles al voriconazol (CMI≤ 1 mg/L). Conclusiones: el estudio de patrones de susceptibilidad en aislados de Candida provenientes de mujeres con vulvovaginitis permite profundizar en cómo abordar la terapéutica de esta afección; el fluconazol resultó el tratamiento de elección. Los resultados alertan sobre la emergencia de C. glabrata, C. krusei, C. parapsilosis, C. tropicalis, C. inconspicua y C. lusitaniae como agentes causales de la candidiasis vulvovaginal(AU)


Introduction: vulvovaginitis is one of the main gynecological diseases frequently caused by candidiasis. Candida albicans is considered as the most important etiological agent for the disease; however, recent students have revealed an increased incidence of other species of the genus. Some of them may show particular resistence to usual antimycotic treatments. Objective: to evaluate the antifungal susceptibility of vaginal isolates from Cuban female patients suspected of vulvovaginal candidiasis in 2015. Methods: twenty eight Candida genus isolates underwent in vitro susceptibility tests with ATBTM Fungus 3 using several antifungal agents (5 fluorocytosine, anphotericin B, fluconazole, itraconazole and vorixonazole). Results: all isolates were susceptible to B anphotericin and one C. albicans isolate was reported as resistant to the studied azoles. All the species other thanC. albicans were susceptible to voriconazole (CMI≤ 1mg/L). Conclusions: the study of susceptibility patterns in Candida isolates from women with vulvovaginitis allow delving into the different ways of approaching the therapeutics of this disease; fluconazole was the treatment of choice. The results show emergence of C. glabrata,C. krusei, C. parapsilosis, C. tropicalis, C. inconspicua and C. lusitaniae as causative agents of vulvovaginal candidiasis(AU)


Subject(s)
Humans , Female , Vulvovaginitis/microbiology , Candida albicans/isolation & purification , Candidiasis, Vulvovaginal/epidemiology , Fluconazole/therapeutic use , Disease Susceptibility/diagnosis
15.
Rev. Soc. Bras. Med. Trop ; 49(6): 793-795, Dec. 2016. graf
Article in English | LILACS | ID: biblio-829662

ABSTRACT

Abstract Candida arthritis is an unusual manifestation that usually affects the knees. A 35-year-old man presented with a 2-month history of pain and swelling in the right knee. Swelling persisted after anti-inflammatory treatment. Peripheric spondyloarthritis was considered, but methotrexate, sulfasalazine, and methylprednisolone did not reduce the swelling. Direct examination of synovial fluid and a culture were positive for Candida albicans. Intravenous and intra-articular amphotericin-B were administered. The arthritis regressed and a culture and direct staining showed negative results. Candida arthritis should be considered in patients with arthritis that is resistant to treatment and prolonged, even if risk factors are absent.


Subject(s)
Humans , Male , Adult , Candida albicans/isolation & purification , Candidiasis/complications , Arthritis, Infectious/microbiology , Ankle Joint/microbiology , Candidiasis/diagnosis , Arthritis, Infectious/diagnosis , Spondylarthritis/diagnosis , Diagnosis, Differential
16.
Braz. j. microbiol ; 47(4): 911-916, Oct.-Dec. 2016. tab
Article in English | LILACS | ID: biblio-828186

ABSTRACT

Abstract Objective Candida albicans is the primary causative agent of oral candidosis, and one of its key virulent attributes is considered to be its ability to produce extracellular phospholipases that facilitate cellular invasion. Oral candidosis can be treated with polyenes, and azoles, and the more recently introduced echinocandins. However, once administered, the intraoral concentration of these drugs tend to be sub-therapeutic and rather transient due to factors such as the diluent effect of saliva and cleansing effect of the oral musculature. Hence, intra-orally, the pathogenic yeasts may undergo a brief exposure to antifungal drugs. We, therefore, evaluated the phospholipase production of oral C. albicans isolates following brief exposure to sub-therapeutic concentrations of the foregoing antifungals. Materials and methods Fifty C. albicans oral isolates obtained from smokers, diabetics, asthmatics using steroid inhalers, partial denture wearers and healthy individuals were exposed to sub-therapeutic concentrations of nystatin, amphotericin B, caspofungin, ketoconazole and fluconazole for one hour. Thereafter the drugs were removed and the phospholipase production was determined by a plate assay using an egg yolk-agar medium. Results The phospholipase production of these isolates was significantly suppressed with a percentage reduction of 10.65, 12.14, 11.45 and 6.40% following exposure to nystatin, amphotericin B, caspofungin and ketoconazole, respectively. This suppression was not significant following exposure to fluconazole. Conclusions Despite the sub-therapeutic, intra oral, bioavailability of polyenes, echinocandins and ketoconazole, they are likely to produce a persistent antifungal effect by suppressing phospholipase production, which is a key virulent attribute of this common pathogenic yeast.


Subject(s)
Humans , Phospholipases/biosynthesis , Candida albicans/drug effects , Candida albicans/metabolism , Candidiasis, Oral/microbiology , Candidiasis, Oral/drug therapy , Antifungal Agents/pharmacology , Polyenes/therapeutic use , Polyenes/pharmacology , Azoles/therapeutic use , Azoles/pharmacology , Candida albicans/isolation & purification , Candida albicans/pathogenicity , Smoking , Microbial Sensitivity Tests , Dentures , Virulence Factors , Diabetes Mellitus , Enzyme Activation , Extracellular Space , Echinocandins/pharmacology , Antifungal Agents/therapeutic use
17.
Rev. salud pública ; 18(6): 953-962, nov.-dic. 2016. tab, graf
Article in Spanish | LILACS | ID: biblio-962037

ABSTRACT

RESUMEN Objetivo Determinar la frecuencia de las dermatomicosis en personas de diferentes instituciones de atención social en la ciudad de Manizales durante el año 2011. Método Mediante la toma de muestras de los sitios que presentaban algún tipo de lesión sospechosa de ser una micosis cutánea, se hizo un análisis directo con KOH y cultivo en medios de Saboureaud y Mycosel. Se aplicó un instrumento de recolección de información para establecer factores asociados con la presencia de estos microorganismos. Resultados Los hongos levaduriformes encontrados con mayor frecuencia fueron: Candida albicans, Trichosporon sp, y los mohos saprofitos Penicillium sp, fusarium sp; seguido de hongos dermatofitos como: Trichophyton mentagrophytes, Trichophyton rubrum, Epidermophyton floccosum y Microsporum gypseum. Las lesiones secas y descamativas se encontraron con mayor frecuencia. El compartir baños y vivir en hacinamiento y el uso de elementos comunes fueron los factores asociados más importantes en este estudio. Conclusiones Las dermatomicosis son frecuentes en poblaciones vulnerables y se asocian a diferentes factores muy similares a los encontrados en otros estudios de igual naturaleza.(AU)


ABSTRACT Objective To determine the frequency of ringworm in people of different social care institutions in the city of Manizales in 2011. Method Using the sampling sites that had some kind of suspicious lesion from a cutaneous mycosis, direct analysis with KOH and culture media was Saboureaud and Mycosel. An instrument of data collection was used to establish factors associated with the presence of these microorganisms. Results The yeast found most frequently were: Candida albicans, Trichosporon sp and Penicillium molds saprophytes sp, Fusarium sp, followed by dermatophyte fungi such as Trichophyton mentagrophytes, Trichophyton rubrum, Epidermophyton floccosum and Microsporum gypseum. Dry scaly lesions were found more frequently. The shared bathrooms and living in overcrowded and the use of common elements were the most important in this study associated factors. Conclusions Dermatomycoses are common in vulnerable populations and are associated with different very similar to those found in other studies of the same nature factors.(AU)


Subject(s)
Humans , Penicillium/isolation & purification , Trichosporon/isolation & purification , Candida albicans/isolation & purification , Dermatomycoses/epidemiology , Epidemiology, Descriptive , Colombia/epidemiology , Vulnerable Populations
18.
Rev. Assoc. Med. Bras. (1992) ; 62(6): 561-567, Sept. 2016. tab
Article in English | LILACS | ID: biblio-829496

ABSTRACT

Summary Objective: To describe thyroid alterations in term newborns (TNB) with fungal sepsis during NICU hospitalization. Method: The study included six TNB that during the clinical and laboratory manifestations of sepsis with positive cultures for fungus showed changes in thyroid hormones, called low T3 syndrome and low T3-T4 syndrome. TNB that could present hormonal changes caused by disease as those born to mothers with thyroid disease, or who had perinatal asphyxia and major surgeries were excluded. Results: Of six TNB with fungal sepsis, five had positive culture for Candida albicans and one had positive culture for Candida tropicalis. Low T3 syndrome was observed in two TNB (50%), while T3-T4 syndrome was observed in other two (100%). The four children progressed to septic shock. Conclusion: Fungal sepsis is becoming more common among newborns admitted to NICU. Thyroid insufficiency could be a marker of disease severity with possible need for hormone supplementation.


Resumo Objetivo: descrever as alterações tireoidianas em recém-nascidos de termo (RNT) que apresentaram sepse fúngica durante internação na UTI neonatal. Método: foram incluídos seis RNT que, durante as manifestações clínicas e laboratoriais de sepse, com culturas positivas para fungo, apresentaram alterações dos hormônios tireoidianos, denominadas síndrome do T3 baixo e síndrome do T3 e T4 baixo. Foram excluídos RNT que apresentaram alteração hormonal por doença, como RNT filhos de mães com doença tireoidiana, asfixia perinatal e cirurgias de grande porte. Resultados: dos seis RNT com sepse fúngica, cinco apresentavam cultura positiva para Candida albicans e um para C. tropicalis. A síndrome do T3 baixo foi observada em duas crianças (50%) e a do T3 e T4 baixo em dois RN (100%). As quatro crianças evoluíram com choque séptico. Conclusão: a sepse fúngica é cada vez mais frequente nos recém-nascidos internados em UTI neonatal. A insuficiência tireoidiana pode vir a ser marcadora de gravidade da doença, e a suplementação hormonal pode ser necessária.


Subject(s)
Humans , Male , Female , Infant, Newborn , Euthyroid Sick Syndromes/microbiology , Sepsis/blood , Candidemia/blood , Infant, Newborn, Diseases/blood , Candida albicans/isolation & purification , Intensive Care, Neonatal , Sepsis/microbiology , Candida tropicalis/isolation & purification , Candidemia/microbiology , Infant, Newborn, Diseases/microbiology
19.
Rev. argent. microbiol ; 48(1): 43-49, mar. 2016. ilus, tab
Article in English | LILACS | ID: biblio-843146

ABSTRACT

Candida africana taxonomical status is controversial. It was proposed as a separate species within the Candida albicans species complex; however, phylogenetic analyses suggested that it is an unusual variety of C. albicans. The prevalence of C. albicans-related species (Candida dubliniensis and C. africana) as vulvovaginal pathogens is not known in Argentina. Moreover, data on antifungal susceptibility of isolates causing vulvovaginal candidiasis is scarce. The aims of this study were to establish the prevalence of C. dubliniensis and C. africana in vaginal samples and to evaluate the antifungal susceptibilities of vaginal C. albicans species complex strains. We used a molecular-based method coupled with a new pooled DNA extraction methodology to differentiate C. dubliniensis and C. africana in a collection of 287 strains originally identified as C. albicans isolated from an Argentinian hospital during 2013. Antifungal susceptibilities to fluconazole, clotrimazole, itraconazole, voriconazole, nystatin, amphotericin B and terbinafine were evaluated by using the CLSI M27-A3 and M27-S4 documents. Of the 287 isolates, 4 C. dubliniensis and one C. africana strains (1.39% and 0.35% prevalence, respectively) were identified. This is the first description of C. africana in Argentina and its identification was confirmed by sequencing the ITS2 region and the hwp1 gene. C. dubliniensis and C. africana strains showed very low MIC values for all the tested antifungals. Fluconazole-reduced-susceptibility and azole cross-resistance were observed in 3.55% and 1.41% of the C. albicans isolates, respectively. These results demonstrate that antifungal resistance is still a rare phenomenon in this kind of isolates.


La clasificación taxonómica de Candida africana está en discusión, es considerada una nueva especie dentro del complejo C. albicans o una variedad inusual de C. albicans. La prevalencia de las especies relacionadas a C. albicans (C. dubliniensis y C. africana) como agentes de vulvovaginitis en Argentina se desconoce. Los objetivos de este trabajo fueron determinar la prevalencia de C. dubliniensis y C. africana en muestras vaginales y evaluar la sensibilidad a los antifúngicos de aislamientos vaginales de las especies del complejo C. albicans. Para diferenciar C. dubliniensis y C. africana utilizamos un método molecular asociado a un nuevo método de extracción de ADN. Se utilizó una colección de 287 cepas originalmente identificadas como C. albicans aisladas durante 2013 en un hospital de Argentina. Se evaluó la sensibilidad a fluconazol, clotrimazol, itraconazol, voriconazol, nistatina, anfotericina B y terbinafina utilizando los documentos M27-A3 y M27-S4 del CLSI. De los 287 aislamientos, se identificaron 4 C. dubliniensis y 1 C. africana (1,39 y 0,35% de prevalencia, respectivamente). Esta es la primera descripción de C. africana en Argentina. Su identificación fue confirmada por secuenciación de la región ITS2 y del gen hwp1. Las cepas identificadas como C. dubliniensis y C. africana mostraron valores de CIM muy bajos para todos los antifúngicos probados. En los aislamientos de C. albicans, la sensibilidad reducida al fluconazol y la resistencia cruzada a todos los azoles se observó en el 3,55% y el 1,41%, respectivamente. Estos resultados demuestran que la resistencia a los antifúngicos es todavía un fenómeno raro en este tipo de aislamientos.


Subject(s)
Humans , Female , Candida albicans/isolation & purification , Candida albicans/drug effects , Candidiasis, Vulvovaginal/drug therapy , Antifungal Agents/therapeutic use , Vulvovaginitis/microbiology , Candida albicans/classification
20.
Acta odontol. latinoam ; 29(3): 197-205, 2016. tab, graf
Article in English | LILACS | ID: biblio-868691

ABSTRACT

Molecular techniques have been used in recent studies toidentify a wide range of potential bacterial pathogens inperi­implant pockets of the oral cavity. However, the prevalence and molecular epidemiology of yeasts and species distribution related to peri­implantitis are as yet unknown. The aim of thisstudy was to determine the prevalence and distribution of yeasts in peri­-implant biofilm and to study genetic relatedness of Candida albicans.Yeasts recovered from peri­implant biofilm samples (n=89) andbuccal samples (n=120) were studied in 40 immunocompetent non­-smoking patients who visited the dental clinic of the Asociación Implantodontológica Argentina, Buenos Aires, Argentina, and had received oral rehabilitation with implants for more than five years. Yeasts recovered from samples were studied by typing assays using RAPD­PCR. The prevalence of yeasts in the peri­implant sulcus was 73% (n=29). C. albicans was the most prevalent species identified in this study population. The RAPD analysis showed identical genotypes inmost C. albicans spp. from the two different sampling sites: buccal and peri­implant. These findings suggest that periimplant biofilm is an ecological niche that favors the growth of yeast species. Most C. albicans found in peri­implant biofilmoriginate from the endogenous infection caused by commensalstrains.


Las técnicas moleculares se han utilizado en estudios recientespara identificar una gran diversidad de patógenos bacterianosde surcos periimplantarios de cavidad bucal. Sin embargo, laprevalencia y epidemiología molecular de especies de levadurasen relación con la periimplantitis son aún desconocidas. Elobjetivo de este estudio fue determinar la prevalencia ydistribución de las levaduras en la biopelícula periimplantaria yestudiar la relación genética de Candida albicans. Se estudiaron40 pacientes inmunocompetentes no fumadores que se asistieronen la clínica dental de la Asociación ImplantodontológicaArgentina, Buenos Aires, Argentina, y que habían recibidorehabilitación oral con implantes durante más de cinco años.Las levaduras aisladas de las muestras de biopelículaperiimplantaria (n = 89) y bucales (n = 120), fueron identificadaspor métodos micológicos tradicionales y moleculares. Se obtuvoel ADN de C. albicans y se realizaron estudios moleculares porRAPD ­PCR. La prevalencia de levaduras en el surco alrededordel implante fue de 73 % (n = 29). C. albicans fue la especie másfrecuente identificada en esta población de estudio. El análisisRAPD permitió identificar idénticos genotipos de C. albicans enambos nichos ecológicos estudiados, periimplantar y bucal.Según los resultados obtenidos, el surco periiplantario es unnicho ecológico que favorece el crecimiento de especies delevaduras del género Candida. La mayoría de los aislamientosde C. albicans periimplantarios se originan a partir de lainfección endógena causada por cepas comensales.


Subject(s)
Humans , Male , Adult , Female , Middle Aged , Aged , Candida albicans/isolation & purification , Candida albicans/genetics , Prosthesis-Related Infections/etiology , Prosthesis-Related Infections/genetics , Polymerase Chain Reaction/methods , Argentina , Dental Plaque/microbiology , Statistical Analysis
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