Parasitic monogenoideans of Sciades herzbergii as bioindicators of environmental quality in amazonian estuarines ecosystems.

This study evaluated the use of gill parasitic monogenoideans from Sciades herzbergii (Siluriformes: Ariidae) as bioindicators of environmental quality in Amazonian estuarine ecosystems. Fish were caught in the tidal channels in an impacted area - IA, near the port of São Luís and a reference area - RA, in the Caeté estuary, Bragança. The influence of the capture site and seasonality on parasite abundance, environmental variables and biometric data of hosts were verified. A total of 416 S. herzbergii specimens were analyzed. The weight and total length of fish from the RA were greater than those of the IA. The relative condition factor was influenced by seasonality. A total of 4,265 monogenoidean specimens from the following species were identified: Chauhanellus boegeri, C. susamlimae, C. velum, Calceostomella herzbergii and Dactylogyridae gen. sp. The seasonal mean parasitic abundance of C. susamlimae was significantly different, with the highest values recorded during the dry season. The mean abundance of C. herzbergii was influenced by seasonality and by the capture site. During the rainy period, the parasite indices in the RA were higher than those of IA. C. herzbergii is a bioindicator sensitive to low water quality, especially in relation to water turbidity in Amazon estuaries.

Alternative technique for preliminary impression in edentulous patients / Técnica alternativa para moldagem preliminar de pacientes desdentados totais

Objective: The aim of this study was to analyze the reproducibility of the anatomic models of edentulous maxillary and mandibular arches. Material and Methods: Alginate molds of the edentulous arches of standard model were performed and the tray was placed to the special device. These models received three metal spheres on surface with two positioned on the crest of the alveolar ridge (spheres 1 and 2) and other one perpendicular to the intersection of the midpalatal suture (sphere 3) and impression was performed using alginate. The proportion powder/ liquid was measured according manufacturer for both arches. To double molding technique with alginate was necessary to uniformly relieve using an acetate film. After that, were performed the first impression and the second layer of alginate with conventional water-powder-proportion and also the second layer of alginate with altered waterpowder-proportion. The distances of each spheres wereobtained using a three-dimensional measuringmachine, and the data were analyzed byDunnet, ANOVA and Tukey tests with a significant level of 5%. Results: A comparison of the water-powderproportion showed significant differences in the maxillary archer with sphere distance between 3-2 (p< 0.0001) and 1-3(p< 0.0001). The mandibular archer showed significant differences when relief between distance 1-2 (p< 0.041). The Dunnet test showed different in 1-2 mandibular groups (p< 0.0450). Conclusion: The reline alginate techniques showed differences in results in comparison to the conventional technique, however, the proportion water/powder technique modified, decreasing the viscosity, showed satisfactory results, the relief variable showed no difference statistically significantly and the techniques proposed could be employed in clinical practice (AU)

Objetivo: O propósito deste estudo foi analisar o grau de reproducibilidade de modelos anatômicos de arcos maxilares e mandibulares. Material e Métodos: Moldes de alginato de modelos padrão desdentados foram realizados a partir do uso de uma moldeira adaptada em um dispositivo metálico. Os modelos receberam três esferas em sua superfície onde duas eram posicionadas na crista do rebordo alveolar (esferas 1 e 2) e uma outra perpendicular à interseção da rafe mediana (esfera 3) e a moldagem foi realizada com o emprego do alginato. A proporção pó e liquido foi mensurada de acordo com o fabricante do alginato para ambos os arcos. Para a técnica de moldagem dupla com alginato foi necessário fazer um alívio com filme de acetato. Após isto foi realizada a primeira moldagem e depois uma segunda camada onde empregou-se a proporção pó líquido convencional e ainda, uma outra situação onde esta proporção foi alterada. A distância entre as esferas foi medida no modelo por uso de equipamento de mensuração tridimensional e os dados foram analisados por Dunnet, Anova e teste Tukey com nível de significância em 5%. Resultados: A comparação da proporção água e pó mostrou diferença estatística significante para os arcos maxilares entre as esferas 3-2 (p< 0.0001). O arco mandibular mostrou diferenças significantes quando avaliada a distância 1-2 (p<0.041). O teste Dunnet mostrou diferenças para o grupo mandibular entre esferas 1-2 (p< 0.0450). Conclusão: A técnica de rembasamento de alginato mostrou resultados diferentes à técnica convencional, contudo a técnica de modificação da proporção água pó diminuiu a viscosidade do alginato, mostrou resultados satisfatórios, outrossim a variável alívio não mostrou diferenças estatísticas. A variação técnica proposta mostrou-se ser viável do ponto de vista clínico.(AU)