Abstract Biofilm on acrylic resin dental prostheses may cause gingival inflammation. This study evaluated the influence of a silicon dioxide coating layer applied onto acrylic resin on the adhesion of microorganisms. Blocks (5 x 5 x 3 mm) of acrylic resin were evaluated for surface roughness and divided into two groups: control (CG) and coated with silicon dioxide (LG group). The specimens were evaluated by scanning electron microscopy (n = 1) and by contact angle analysis (n = 3). For the in situ study, 20 volunteers wore acrylic palatal devices containing three samples from each group (n = 60) for 2 days. The biofilm formed was quantified by metabolic activity and total biomass using the crystal violet assay. The results were subjected to Bartlett’s normality test and Gamma model with random effect for the response variable (α = 5%). The mean contact angle of the coated group was significantly lower than that of the uncoated group (p < 0.05). The metabolic activity of microorganisms in the biofilm on the blocks treated with coating was significantly lower than that of control blocks (p = 0.02). Regarding the amount of extracellular matrix produced by the microorganisms, there was no difference between the CG and LG group (p = 0.05). The application of a silicon dioxide coating on acrylic resin reduced the activity of the polymicrobial biofilm formed in situ. This coating may be advantageous for patients with conventional complete dentures or implants made of acrylic resin and who have motor difficulties that prevent them from cleaning their prostheses properly.

Abstract Acrylic resin has been used in the manufacture of prostheses, however, in the oral cavity, this material starts to retain microorganisms capable of causing gingival inflammation due its porosities. The aim of this study was to evaluate the influence of the use of silicon dioxide as a coating layer applied onto acrylic resin, on the adhesion of Candida albicans (Ca). After the incubation period in Sabouraud Dextrose Broth, a total of 1 ml of the Ca suspension was added to plate wells, each well containing a specimen of acrylic resin. The adhesion ability of Ca on acrylic resin was determined by counting colonies. Three groups (n = 6) of acrylic resin were assessed: with polishing (RP); without polishing (RW); with polishing and coating layer of silicon dioxide (RPC). Ca deposited on the surface of the acrylic resin was also observed using Scanning Electron Microscopy (SEM). Statistical assessment by Kruskal-Wallis and Student-Newman-Keuls Method were done (α = 2%). There was significant difference among the groups. The RPC group showed the lowest growth, with an average of 5.59 Log CFU/cm 2 ; there was a statistically significant difference in relation to group RW, which presented a growth of 6.07 Log CFU/cm 2 and to group RP with 5.91 Log CFU/cm 2 (p < 000.1). SEM images demonstrated that in the RP and RPC group, the surface of the resin had greater regularity, and smaller number of microorganisms. The application of silicon dioxide coating on acrylic resin appears to be a promising alternative, and its use can help in reducing the adhesion of Ca in prostheses.

Resumen: Este artículo tiene como objetivo investigar la enseñanza del dibujo en los cursos ofrecidos por el Departamento de Artes (DEARTES) de la Universidad Federal de Paraná (UFPR), a saber, los cursos de Diseño Industrial y los títulos en Educación Artística que permiten Bellas Artes y Dibujo. El recorte de investigación investiga los planes de estudio vigentes desde 1981 hasta 1987, en los cuales las disciplinas de diseño fueron enseñadas tanto por DEARTES como por el Departamento de Diseño (DDES), que mantuvo diferentes configuraciones de concepción de diseño. La organización del trabajo se divide en tres partes: 1) Interlocuciones entre los Departamentos de Artes y Diseño; 2) Plan de estudios de diseño industrial, comunicación visual y las calificaciones de dibujo y artes plásticas; 3) Prescripciones de dibujo y educación plástica. Para llevar a cabo el análisis propuesto, el marco teórico utilizado se basa en el concepto de figuración de Elias, el campo de Bourdieu y las contribuciones en la historia de las disciplinas de Chervel y Goodson. Las fuentes utilizadas son documentos oficiales, programas temáticos y actas. Esto nos permitió analizar las prescripciones de diseño que conformaban el currículo de los cursos mencionados. Resumen (DEARTES UFPR, UFPR , (UFPR) saber Dibujo 198 1987 DDES, DDES (DDES) partes 1 2 industrial plásticas 3 plástica propuesto Elias Goodson oficiales actas mencionados (UFPR 19 (DDES

Resumo: O presente artigo se propõe a investigar o ensino de desenho nos cursos oferecidos pelo Departamento de Artes (DEARTES) da Universidade Federal do Paraná (UFPR), a saber os cursos de desenho industrial e as licenciaturas em educação artística, habilitação artes plásticas e desenho. O recorte da pesquisa investiga os currículos vigentes entre os anos de 1981 a 1987, nos quais as disciplinas de desenho eram ministradas tanto pelo DEARTES como pelo Departamento de Desenho (DDES), que mantinham configurações diferentes sobre a concepção de desenho. A organização do trabalho está dividida em três partes: 1) Interlocuções entre os Departamentos de Artes e Desenho; 2) Currículo de Desenho Industrial, Comunicação Visual e das habilitações de Desenho e Artes Plásticas; 3) Prescrições do ensino de desenho e plástica. Para realizar a análise proposta, o referencial teórico utilizado se vale do conceito de figuração de Elias, campo de Bourdieu e as contribuições sobre a história das disciplinas de Chervel e Goodson. As fontes utilizadas são documentos oficiais, programas de disciplinas e atas. O que permitiu analisar as prescrições sobre o desenho que compunham o currículo dos cursos citados. Resumo (DEARTES UFPR, UFPR , (UFPR) artística 198 1987 DDES, DDES (DDES) partes 1 2 Industrial Plásticas 3 plástica proposta Elias Goodson oficiais atas citados (UFPR 19 (DDES

Abstract: The present paper proposes to investigate drawing teaching in the courses offered by the Department of Arts (DEARTES) of Federal University of Paraná, including the courses of Industrial Designand the bachelor’s degrees in Artistic Education, Arts and Design qualifications. The research focus investigates the courses syllabus between 1981 and 1987, in which the drawing disciplines were taught by both DEARTES and the Design Department (DDES), which had different configurations of the drawing concept. This paper is organized into three parts: 1) Interlocutions between the Departments of Arts and Design; 2) Industrial Design, Visual Communication and Design and Plastic Arts syllabus; 3) Prescriptions of drawing teaching and Plastic Arts. To carry out the proposed analysis, the theoretical reference used is based on the concept of figuration by Elias, field by Bourdieu and the contributions on the history of school subjects by Chervel and Goodson. The sources used are official documents, discipline programs and minutes. This allowed the drawing prescriptions analysis that composed the syllabus of the above mentioned courses. Abstract (DEARTES Paraná bachelors bachelor s Education qualifications 198 1987 DDES, DDES , (DDES) parts 1 2 3 Elias Goodson documents minutes 19 (DDES