RESUMO
To assess the effect of cleaning protocols on dentin contaminated with blood in reparative endodontic materials, bovine root samples were divided: no contamination (N); contamination (P); contamination and cleaning with saline (S), 2.5% NaOCl+saline (Na) or 2.5% NaOCl+17% EDTA+saline (NaE) and filled with: mineral trioxide aggregate (MTA), calcium-aluminate-cement (C), or C+collagen (Ccol) (n=13). The samples were evaluated for porosity, chemical composition, and bond strength. MTA porosity was lower than C (p=0.02) and higher than Ccol (p<0.001). P and NaE were similar (p=1.00), but higher than the other groups (p<0.001). MTA bond strength was similar to Ccol (p=0.777) and lower than C (p=0.028). P presented lower bond strength than the N (p<0.001); S and Na were similar to each other (p=0.969), but higher than P and lower than N (p<0.001). It was observed a predominance of mixed and cohesive failures. None of the samples showed Ca/P ratio values similar to human hydroxyapatite. This study showed that contamination with blood increased the materials porosity, but dentin cleaning with 2.5% NaOCl reduced this effect, and the collagen additive reduced the material porosity. Furthermore, blood contamination reduced the materials bond strength, and cleaning with saline or 2.5% NaOCl diminished this effect.
Assuntos
Sangue , Colágeno , Dentina , Porosidade , Bovinos , Dentina/efeitos dos fármacos , Colágeno/química , Animais , Raiz Dentária/química , Silicatos/química , Compostos de Cálcio/química , Colagem Dentária/métodos , Compostos de Alumínio/química , Cerâmica/química , Teste de Materiais , Materiais Biocompatíveis/química , Óxidos/química , Materiais Restauradores do Canal Radicular/química , Combinação de Medicamentos , Hipoclorito de Sódio/químicaRESUMO
Abstract To assess the effect of cleaning protocols on dentin contaminated with blood in reparative endodontic materials, bovine root samples were divided: no contamination (N); contamination (P); contamination and cleaning with saline (S), 2.5% NaOCl+saline (Na) or 2.5% NaOCl+17% EDTA+saline (NaE) and filled with: mineral trioxide aggregate (MTA), calcium-aluminate-cement (C), or C+collagen (Ccol) (n=13). The samples were evaluated for porosity, chemical composition, and bond strength. MTA porosity was lower than C (p=0.02) and higher than Ccol (p<0.001). P and NaE were similar (p=1.00), but higher than the other groups (p<0.001). MTA bond strength was similar to Ccol (p=0.777) and lower than C (p=0.028). P presented lower bond strength than the N (p<0.001); S and Na were similar to each other (p=0.969), but higher than P and lower than N (p<0.001). It was observed a predominance of mixed and cohesive failures. None of the samples showed Ca/P ratio values similar to human hydroxyapatite. This study showed that contamination with blood increased the materials porosity, but dentin cleaning with 2.5% NaOCl reduced this effect, and the collagen additive reduced the material porosity. Furthermore, blood contamination reduced the materials bond strength, and cleaning with saline or 2.5% NaOCl diminished this effect.
Resumo As amostras de raízes bovinas foram divididas em: sem contaminação (N); contaminação sanguínea (P); contaminação sanguínea e limpeza com soro fisiológico (S), 2,5% NaOCl+soro fisiológico (Na) ou 2,5% NaOCl+17%EDTA+soro fisiológico (NaE) e preenchido com: agregado de trióxido mineral (MTA), cimento de aluminato de cálcio (C), ou C+colágeno (Ccol) (n=13). A porosidade do MTA foi menor que C (p=0,02) e maior que Ccol (p<0,001). P e NaE foram semelhantes (p=1,00), mas superiores aos demais grupos (p<0,001). A resistência de união do MTA foi semelhante ao Ccol (p=0,777) e inferior ao C (p=0,028). P apresentou menor resistência de união que o N (p<0,001); S e Na foram semelhantes entre si (p=0,969), porém maiores que P e menores que N (p<0,001). Este estudo mostrou que a contaminação com sangue aumentou a porosidade dos cimentos, mas a limpeza da dentina com NaOCl 2,5% reduziu esse efeito, e o aditivo de colágeno reduziu a porosidade dos cimentos. Além disso, a contaminação sanguínea reduziu a resistência de união dos cimentos e a limpeza com solução salina ou NaOCl 2,5% diminuiu esse efeito.
RESUMO
Salmonella enterica is a major food-borne pathogen that affects cattle-rearing systems worldwide. Little information is available on the epidemiology and pathology of salmonellosis and the virulence genes (VGs) carried by Salmonella in spontaneous outbreaks in cattle. We describe epidemiological findings in 15 fatal outbreaks of salmonellosis in Uruguayan dairy farms and the age, clinical signs, and pathology in 20 affected calves. We also describe the serotypes and frequencies of 17 VGs in the causative Salmonella strains and explore their associations with epidemiological, clinical, and pathological findings. Salmonella Typhimurium and Dublin were identified in 11/15 and 4/15 outbreaks, respectively. The most frequent reason for consultation was digestive disease (8 outbreaks caused by S. Typhimurium), followed by sudden death (4 outbreaks, 3 caused by S. Dublin). Morbidity, mortality, and lethality ranged 4.8-100%, 3.8-78.9%, and 10-100%, without significant differences between serotypes. Diarrhea, the most common clinical sign (14 cases), was associated with the Typhimurium serotype (OR = 26.95), especially in ≤ 30-day-old calves with fibrinous enteritis as the main autopsy finding. The Dublin serotype affected ≥ 50-day-old calves and was associated with fibrinosuppurative splenitis (p = 0.01) and tubulointerstitial nephritis (OR = 48.95). The chances of the Dublin serotype increased significantly with age. There was low variability of VG across serotypes. The pefA gene was associated with the Typhimurium serotype (OR = 21.95), macroscopic enteritis (p = 0.03), and microscopic fibrinosuppurative splenitis (p = 0.04). Understanding the epidemiology, pathology, and virulence of S. enterica at the farm level is key to delineating prevention and control strategies to mitigate its impact on animal and human health.
Assuntos
Doenças dos Bovinos , Intoxicação Alimentar por Salmonella , Salmonelose Animal , Salmonella enterica , Humanos , Animais , Bovinos , Salmonella typhimurium , Virulência , Salmonelose Animal/microbiologia , Doenças dos Bovinos/microbiologia , Surtos de DoençasRESUMO
Omphalocele is a congenital abdominal wall defect that occurs approximately 1 in 4000-6000 live births. The abdominal-visceral disproportion, large diameter of the defect, volume of liver in the sac along with high incidence of associated anomalies make the surgical management a real challenge. Currently, there are two strategies for managing giant omphaloceles, staged surgical closure and nonoperative delayed closure. The combined treatment with PPP and BoNT/A injection has recently been described in adults. There is strong evidence on safety and efficacy of the use of BoNT/As in other areas of pediatrics and no recent reports of PPP use in children. Also, there are no data available about the combination of both techniques in pediatric population. The purpose of this manuscript is to report a case of a 7-year-old female child that was referred to our institution with a large ventral hernia secondary to omphalocele. We opted for a combined approach with BoNT/A injection and PPP before the definitive surgery. The surgical result was great with midline closure with no tension and no need for prosthetic substitution or component separation needed. To our knowledge, this is the first case report of BoNT/A injection and PPP for large ventral hernias in children. BoNT/A application was safe and the PPP technique was also proved to be applicable on children. We believe that the combination of BoNT/A and PPP presented to be a safe approach with an excellent result, particularly for not needing abdominal wall prosthetic substitution.
Assuntos
Toxinas Botulínicas Tipo A/uso terapêutico , Hérnia Umbilical/tratamento farmacológico , Hérnia Umbilical/cirurgia , Hérnia Ventral/tratamento farmacológico , Hérnia Ventral/cirurgia , Herniorrafia/métodos , Pneumoperitônio Artificial/métodos , Pneumoperitônio/cirurgia , Toxinas Botulínicas Tipo A/farmacologia , Criança , Feminino , HumanosRESUMO
AIM: To evaluate the effects of 2.8% or 10% calcium chloride (CaCl2 ) in calcium aluminate cement (CAC) with either bismuth oxide (Bi2 O3 ) or zinc oxide (ZnO) as radiopacifiers on the progression of osteogenic cell cultures. METHODOLOGY: Rat calvaria-derived cells were grown on Thermanox® coverslips for 24 h and exposed to samples of (i) CACb: with 2.8% CaCl2 and 25% Bi2 O3 ; (ii) CACb+: with 10% CaCl2 and 25% Bi2 O3 ; (iii) CACz: with 2.8% CaCl2 and 25% ZnO; or (iv) CACz+: with 10% CaCl2 and 25% ZnO, placed on inserts. Nonexposed cultures served as the control. Calcium and phosphorus contents in culture media were quantified. The effects of the cements on cell apoptosis, cell viability and acquisition of the osteogenic cell phenotype were evaluated. Data were compared by Kruskal-Wallis test (α = 5%). RESULTS: CACb+ promoted the highest levels of calcium in the culture media; CACz+, the lowest levels of phosphorus (P < 0.05). CACz+ and CACb increased cell apoptosis (P < 0.05). CACb reduced cell viability (P < 0.05) and the expression of the osteoblastic phenotype. CACz+ and CACb+ promoted greater cell differentiation and matrix mineralization compared to CACz and CACb (P < 0.05). CONCLUSION: For CAC with the lower CaCl2 content, the use of Bi2 O3 was detrimental for osteoblastic cell survival and differentiation compared to ZnO, while CAC with the higher CaCl2 content supported the acquisition of the osteogenic cell phenotype in vitro regardless of the radiopacifier used. Thus, CAC with 10% CaCl2 would potentially promote bone repair in the context of endodontic therapies.
Assuntos
Compostos de Alumínio/farmacologia , Cloreto de Cálcio/farmacologia , Compostos de Cálcio/farmacologia , Cimentos Dentários/farmacologia , Osteogênese/efeitos dos fármacos , Animais , Apoptose , Bismuto/farmacologia , Sobrevivência Celular , Células Cultivadas , Cimentos Dentários/química , Fenótipo , Ratos , Ratos Wistar , Crânio/citologia , Óxido de Zinco/farmacologiaRESUMO
AIM: To evaluate mineral trioxide aggregate (MTA), Biodentine and several formulations of calcium aluminate cements (CACb) in terms of their ability to release calcium ions (Ca2+ ) and form apatite-like precipitates after short-term immersion in phosphate-buffered saline (PBS) and its influence on the bond strength to the root-end cavity. METHODOLOGY: Ten samples of MTA, Biodentine, CACb and calcium-enriched aluminate cement (CACb+) were placed in contact with PBS or deionized water for 14 days. The cement surfaces were analysed using SEM, EDS-X and FTIR. Eighty standardized root-end cavities filled with the cements (ten samples of each cement) were immersed in PBS or deionized water for 14 days, and the bond strengths were measured. Data from the push-out test were analysed using two-way ANOVA and Tukey's tests (α = 0.05). RESULTS: A gradual decrease was observed in Ca2+ concentrations and pH of all solutions. FTIR bands of different phases of hydroxyapatite were identified. Crystalline formation was observed on the surface of all cements after immersion in PBS. No significant difference was observed in the bond strength of the test materials (P > 0.05); however, all cements without contact with the solution revealed significantly lower bond strength values than those in contact with the solution (P < 0.05). CONCLUSION: MTA, Biodentine, CACb e CACb+ were associated with precipitation of crystals after being in contact with PBS for 14 days, indicated by different phases of hydroxyapatite crystalline formation, which also increased dislodgment resistance of the material from root-end cavities. The CACb+ had similar bond strengths and precipitation of crystals to existing materials.
Assuntos
Compostos de Alumínio/química , Compostos de Cálcio/química , Colagem Dentária , Cimentos Dentários/química , Óxidos/química , Silicatos/química , Análise do Estresse Dentário , Dentina , Combinação de Medicamentos , Humanos , Teste de Materiais , Raiz DentáriaRESUMO
AIM: To evaluate the effect of a calcium aluminate-based cement (CAC+) on the development of the osteogenic phenotype in vitro. METHODOLOGY: Rat calvaria-derived cells were grown on Thermanox® coverslips for 24 h and then exposed to either samples (4-h set) of CAC+ or mineral trioxide aggregate (MTA) placed on Transwell® inserts for periods of up to 14 days. Nonexposed cultures were used as the controls. The comparisons were made using the nonparametric Kruskal-Wallis test, followed by the Student-Newman-Keuls post hoc test when appropriate. RESULTS: The results showed that proximity to MTA or CAC+ samples inhibited cell growth, whereas at a distance, viable and proliferative cells adhered to and spread on the Thermanox® , expressing osteoblast differentiation markers prior to mineralization of the extracellular matrix. Compared with MTA, the osteogenic cell cultures exposed to CAC+ exhibited significantly greater cell viability, alkaline phosphatase (ALP) activity and expression of runt-related transcription factor 2, osterix, ALP, bone sialoprotein and osteocalcin (P < 0.05 for all). For the osteogenic cell cultures exposed to CAC+, the quantification of matrix mineralization was not altered (P > 0.05). CONCLUSIONS: CAC+ supported the acquisition of the osteogenic cell phenotype in vitro, rendering this novel material a potential alternative to MTA in endodontic procedures. Further in vivo studies are needed to verify if the beneficial in vitro effects of CAC+ on osteoblastic cells correspond to an increase and/or acceleration of bone repair in the periapical region.
Assuntos
Compostos de Alumínio/farmacologia , Compostos de Cálcio/farmacologia , Cimentos Dentários/farmacologia , Osteogênese/efeitos dos fármacos , Animais , Diferenciação Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Células Cultivadas , Combinação de Medicamentos , Osteoblastos/efeitos dos fármacos , Óxidos/farmacologia , Ratos Wistar , Silicatos/farmacologiaRESUMO
Objetivo Analizar la percepción de los estudiantes en relación con las contribuciones de su inserción en actividades artístico-culturales en el espacio universitario para la formación en enfermería. Método Investigación cualitativa, guiada por la epistemología de Fleck. Participaron 17 estudiantes de enfermería integrantes de movimientos artístico-culturales existentes en una institución de enseñanza superior, a saber: Grupo teatral, grupo musical y grupo de Maracatú. Los datos fueron recolectados por medio de entrevista semiestructurada y organizados por la técnica del discurso del sujeto colectivo. Resultados: Los estudiantes destacaron entre las ventajas de las actividades artístico-culturales el estímulo para estudiar, sentirse relajado y más preparado para las actividades académicas, así como propiciar el desarrollo de sensibilidad y competencias que puedan transformar los escenarios de la práctica clínica de enfermería. Fueron indicadas como dificultades, la credibilidad de estas actividades en la academia, frente a la lógica de la formación curativa. Conclusiones: Integrar actividades artísticas y culturales con la formación académica permite al alumno protagonizar modos renovados de pensar en el cuidado de enfermería y fortalecer conexiones con los diferentes conocimientos necesarios para la práctica del cuidado holístico.
Objective To analyze the students' perceptions of the impact which their participation in artistic-cultural activities within the university space has on their nursing-formation process. Method: This is a qualitative research guided by the epistemology of Fleck. Seventeen nursing students from a high level school, and also members of artistic-cultural movements such as theater, music and Maracatu groups, participated in this study. Data were collected through semi-structured interviews and then organized following the collective subject discourse technique. Results: Related to the positive influence of their artistic-cultural activities, the students highlighted their stimulus to study, feeling relaxed, and being more prepared for the academic activities including those which can help them develop competences and sensibilities to improve the clinical nursing practice scenarios. A remark on the academia who doubts the credibility of these activities and who follows a model in which health is only viewed as the absence of illness was also highlighted. Conclusions: The integration of artistic and cultural activities into the nursing formation process allows the students to develop renewed modes of thinking which can strengthen the links among their knowledge areas, and thus prepare them better for a holistic care practice
Objetivo Analisar a percepção dos estudantes em relação às contribuições da sua inserção em atividades artístico-culturais no espaço universitário para a formação em enfermagem. Método: Investigação qualitativa, guiada pela epistemologia de Fleck. Participaram 17 estudantes de enfermagem, integrantes de movimentos artístico-culturais existentes em uma instituição de ensino superior, a saber: Grupo teatral, grupo musical e grupo de Maracatú. Os dados foram coletados por médio da entrevista semiestruturada e organizados pela técnica de discurso do sujeito coletivo. Resultados Os estudantes destacaram de entre as vantagens das atividades artístico-culturais, o estímulo para estudar, sentir-se relaxado e mais preparado para as atividades acadêmicas, bem como propiciar o desenvolvimento de sensibilidade e competências que pudessem transformar os cenários da prática clínica de enfermagem. Foram indicadas como dificuldades, a credibilidade destas atividades na escola, perante à lógica da formação curativista. Conclusões Integrar atividades artísticas e culturais na formação acadêmica, permite ao aluno protagonizar modos renovados de pensar no cuidado de enfermagem e fortalecer conexões com os diferentes conhecimentos necessários para a prática do cuidado holístico.
Assuntos
Humanos , Masculino , Feminino , Estudantes de Enfermagem , Enfermagem , Capacitação ProfissionalRESUMO
This study aimed to investigate the influence of tetraconazole and malathion, both used in agricultural activities, on resistance to fluconazole, itraconazole and voriconazole in Candida parapsilosis ATCC 22019. The susceptibility to tetraconazole, malathion, fluconazole, itraconazole and voriconazole, through broth microdilution. Then, 12 independent replicates, were separated and exposed to four treatment groups, each one containing three replicates: G1: tetraconazole; G2: malathion; G3: fluconazole (positive control); G4: negative control. Replicates from G1, G2 and G3, were exposed to weekly increasing concentrations of tetraconazole, malathion and fluconazole, respectively, ranging from MIC/2 to 32 × MIC, throughout 7 weeks. The exposure to tetraconazole, but not malathion, decreased susceptibility to clinical azoles, especially fluconazole. The tetraconazole-induced fluconazole resistance is partially mediated by the increased activity of ATP-dependent efflux pumps, considering the increase in antifungal susceptibility after the addition of the efflux pump inhibitor, promethazine, and the increase in rhodamine 6G efflux and CDR gene expression in the G1 replicates. Moreover, MDR expression was only detected in G1 and G3 replicates, suggesting that MDR pumps are also involved in tetraconazole-induced fluconazole resistance. It is noteworthy that tetraconazole and fluconazole-treated replicates behaved similarly, therefore, resistance to azoles of clinical use may be a consequence of using azoles in farming activities.
Assuntos
Antifúngicos/farmacologia , Candida/efeitos dos fármacos , Clorobenzenos/farmacologia , Fluconazol/farmacologia , Fungicidas Industriais/farmacologia , Triazóis/farmacologia , Transportadores de Cassetes de Ligação de ATP/antagonistas & inibidores , Transportadores de Cassetes de Ligação de ATP/genética , Transportadores de Cassetes de Ligação de ATP/metabolismo , Animais , Antialérgicos/farmacologia , Candida/genética , Resistência Microbiana a Medicamentos , Ergosterol/análise , Regulação Fúngica da Expressão Gênica , Humanos , Itraconazol/farmacologia , Malation/farmacologia , Testes de Sensibilidade Microbiana , Prometazina/farmacologia , Rodaminas , Esterol 14-Desmetilase/genética , Voriconazol/farmacologiaRESUMO
Bovine viral diarrhoea virus (BVDV) causes one of the most important diseases of cattle in terms of economic costs and welfare. The aims were to estimate herd prevalence and to investigate the factors associated with antibodies in bulk tank milk (BTM) in dairy herds through a matched case-control study. To estimate herd prevalence, BTM samples were randomly selected (n = 314) from a population (N = 1604). The true prevalence of BVDV was 24.3% (CI 95% = 20.1-29.3%). For the case-control study, BVDV antibody-positive herds (high antibody titres) were classified as cases (n = 21) and matched (n = 63) by milk production with herds presenting low antibody titres (ratio of 1 : 3). Three multivariable models were built: 1) full model, holding all 21 variables, and two models divided according to empirical knowledge and similarity among variables; 2) animal factor model; and 3) biosecurity model. The full model (model 1) identified: age as a culling criteria (OR = 0.10; CI 95% = 0.02-0.39; P < 0.01); farms that provided milk to other industries previously (OR = 4.13; CI 95% = 1.17-14.49; P = 0.02); and isolation paddocks for ill animals (OR = 0.14; CI 95% = 0.01-0.26; P = 0.02). The biosecurity model revealed a significant association with the use of natural mating (OR = 9.03; CI 95% = 2.14-38.03; P < 0.01); isolation paddocks for ill animals (OR = 0.06; CI 95% = 0.05-0.83; P = 0.03); years providing milk for the same industry (OR = 0.94; CI 95% = 0.91-0.97; P = 0.02); and direct contact over fences among cattle of neighbouring farms (OR = 5.78; CI 95% = 1.41-23.67; P = 0.04). We recommend the application of grouping predictors as a good choice for model building because it could lead to a better understanding of disease-exposure associations.