This study evaluated water sorption in heat-polymerized acrylic resins processed in monomaxillary flasks by water bath and in bimaxillary flasks by microwave energy and water bath. Fifty heat-polymerized acrylic resin specimens were fabricated according to the 12th specification of the American Dental Association and assigned to 3 groups: group 1 was processed by water bath in monomaxillary metallic flask; group 2 was processed by microwave energy in bimaxillary PVC flask; and group 3 was processed by water bath in bimaxillary metallic flask. Specimens were submitted to water sorption test, means were calculated and analyzed statistically by Student's t-test. Means (in g/cm 3 ) were: group 1 -0.024085, group 2 -0.025312 and group 3 -0.022098. Microwave energy processing and the amount of stone and resin used in the bimaxillary PVC flask did not influence water sorption; specimens processed in bimaxillary metallic flask by water bath presented lower water sorption means, suggesting an inadequate polymerization of the acrylic resin mass.
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Universidade de São Paulo (USP), São Paulo/SP -Brasil
RESUMO -Qualidade das Escolas: tensões e potencialidades das avaliações externas.A partir do debate sobre qualidade na educação, este trabalho objetiva evidenciar o fortalecimento das iniciativas de avaliações externas como diretriz da política educacional para a melhoria da qualidade da educação das escolas. Apoiando-se na pesquisa nacional, procura-se mostrar possíveis interfaces das avaliações com a qualidade da educação. São destacadas algumas potencialidades e, também, alguns indícios de tensões das políticas de avaliação no cotidiano escolar. Por fim, conclui-se que a avaliação externa, concebida como um processo amplo que envolve escolhas técnicas, políticas e ideológicas, é um importante instrumento para o incremento da qualidade da educação nas escolas públicas. Palavras-chave: Qualidade do Ensino. Avaliação Externa. Escolas Públi-cas. Ensino Fundamental.ABSTRACT -School Quality: impacts and challenges of external evaluation. From the debate on quality in education this work aims at identifying the strengthening of initiatives external evaluations of educational policy as a guideline for improving the quality of education in schools. Drawing on national survey try to show possible interfaces of evaluations with the quality of education. Are highlighted some potential, and also some evidence of political tensions evaluation in school life. Finally, it is concluded that the external evaluation, conceived as a broad process that involves technical choices, political and ideological is an important tool to increase the quality of education in public schools.
Este artigo se reporta a dados obtidos em investigação que se propôs a analisar o programa de governo denominado Sistema de Proteção Escolar, implementado pela Secretaria de Estado da Educação desde 2010. O foco ora analisado tem como propósito compreender as percepções de Professores Mediadores
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