The purpose of this in vitro study was to evaluate the effect of gastric acid on the surface roughness and biofilm formation of bulk-fill composite resins. Twenty-seven samples of each composite resin were obtained: G1: Filtek Z250 XT... more
The purpose of this in vitro study was to evaluate the effect of gastric acid on the surface roughness and biofilm formation of bulk-fill composite resins. Twenty-seven samples of each composite resin were obtained: G1: Filtek Z250 XT (Z250), G2: Filtek Bulk Fill (FTK), G3: Tetric N-Ceram Bulk Fill (TTC), and G4: Aura Bulk Fill (AUR). The samples were quantitatively analyzed for surface roughness (Ra) using a roughness tester (n=15) and for biofilm formation (Cn) by the counting of colony-forming units (CFUs/mL) (n=9) in three different moments: after polishing (Ra0 and Cn0), after gastric acid immersion (Ra1 and Cn1), and after gastric acid and simulated tooth brushing (Ra2 and Cn2). Qualitative analysis through surface topography (n=3) was evaluated by scanning electron microscopy (SEM). Ra values were subjected to two-way repeated measures ANOVA, followed by Tukey's test. Cn values were subjected to Kruskal-Wallis analysis, followed by multiple comparisons analysis (α=0.05). Z250 and FTK showed significant increases in surface roughness at Ra1. There were fewer CFUs/mL on TTC and AUR in relation to those of Z250 and FTK for Cn0, Cn1 and Cn2. The SEM images showed that gastric acid increased the formation of cracks, exposure of fillers and micro cavities for all composite resins. After tooth brushing, the topographical changes were more evident but did not influence biofilm formation. The gastric acid promoted both degradation of the surfaces and bacterial adhesion for all composite resins.
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Research Interests: Animal Science and Ceres
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One of the most important factors in Boophilus microplus cattle tick control program is the low efficacy showed by applied treatment. Many conditions act to bring about a result, such as how to handle the cattle, low acaricide... more
One of the most important factors in Boophilus microplus cattle tick control program is the low efficacy showed by applied treatment. Many conditions act to bring about a result, such as how to handle the cattle, low acaricide concentration, and resistance situations. This research examined carrefully amidinics acaricides products efficacy with dip vat samples pH, emphasizing this result an important variable to be considered.
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Schistosoma mansoni is the main causative agent of intestinal schistosomiasis which affects millions of people worldwide. At the larval stage, miracidia are released into bodies of water where they utilize their motility to successfully... more
Schistosoma mansoni is the main causative agent of intestinal schistosomiasis which affects millions of people worldwide. At the larval stage, miracidia are released into bodies of water where they utilize their motility to successfully infect their intermediate host, snails. Here, we revisit the motility and survival of S. mansoni miracidia throughout its life span. Briefly, miracidia motility was monitored at 30-min and 60-min intervals under the presence/absence of natural/artificial light. Based on a subjective evaluation of activity, body shape and transparency, 6 categories of miracidia activity were established from its fully active stage to its immobile larva stage. The estimated life span of miracidia was 5.8 and 3.5 h in the experiments with 60-min and 30-min observation intervals, respectively. Death was defined by an absence of cilia and body movement. When mobility was used as a proxy for infectivity, infective miracidia were detected at 2.5 and 4.5 h, respectively. The present miracidia motility and survival re-evaluation supports parameters optimization for computational modelling of schistosomiasis transmission dynamics. Target control interventions, especially at late stages next to transmission interruption, may greatly benefit from improved modelling studies.
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The objective of this study was to evaluate the reproductive performance of heifers mated at different ages and submitted to estrus sincronization. The study was based on data from 270 heifers (British breeds and cross-breeds) collected... more
The objective of this study was to evaluate the reproductive performance of heifers mated at different ages and submitted to estrus sincronization. The study was based on data from 270 heifers (British breeds and cross-breeds) collected through the period from 2003 to 2005 and mated at 14 months old (A14, n = 70), 18 months old (A18, n = 36) and 26 months old (A26, n = 164). The hormonal program was based initially on the animals estrus identification following by conventional artificial insemination (without hormonal utilization) after 12 hours during 7 days. At the seventh day, whole animals that were not inseminated got one application of prostaglandin F2a and were inseminated for more 5 days with estrus identification, making a AI group. After 12 days of insemination, the animals were submitted to cleanup bulls. The heifers that were not inseminated because they didn’t show estrus, were served only by bulls, forming the BU groups. The parameters analyzed were weight at beginning of mating (BW), rate of inseminated heifers (RIH), percentage of heifers mated only with bulls (HMB), pregnancy rates (PR) according to the reproductive technique and age at mating. The PR was 84.3 % for the A14 group, 94.4 % for the A18 and 90.9 % for the A26 animals group. The AI group reached higher (p<0.01) PR (93.80%) than those heifers served by using just bulls (81.70%), in spite of the age at mating. Age at mating did not interfere in the pregnancy rate. Oldest heifers reached higher rate of inseminated heifers than younger ones. Inseminated group reached higher pregnancy rate than heifers served only by bulls.
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Avaliação do desempenho reprodutivo de vacas de corte lactantes submetidas à IATF a partir da aplicação do GnRH, da manifestação estral, da reutilização de dispositivos intravaginais e da condição corporal Evaluation of Reproductive Performance of Lactating Beef Cows Subjected to FTAI from the Ap...more
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Objectives: This experimental laboratory study aimed to compare the effect of four external irrigation protocols on bone tissue heating during guided implant drilling. Methods: Forty perforations were made in ten bovine rib specimens... more
Objectives: This experimental laboratory study aimed to compare the effect of four external irrigation protocols on bone tissue heating during guided implant drilling. Methods: Forty perforations were made in ten bovine rib specimens using customized surgical templates. Four experimental groups (n=10/group) were tested: Control group = 10-ml syringe with 25°C saline solution, Group 1 = 10-ml syringe with 10°C saline solution, Group 2 = combined external irrigation using a handpiece and a 10-ml syringe with 25°C saline solution, and Group 3 = combined external irrigation using a handpiece and a 10-ml syringe with 10°C saline solution. The temperature was measured at cervical and apical points using K-type thermocouples, a digital thermometer, and a video recorder. Data were analyzed by ANOVA and Pearson’s correlation coefficients (alpha=0.05). Results: The maximum temperature was 42°C (cervical) and 44°C (apical). No difference in temperature changes was found among groups, but the d...
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Context Occlusal splints are widely used in clinical practice as a noninvasive treatment for patients with temporomandibular disorders (TMDs) and for reduction of TMD-related symptoms. A force diagram allows a health care professional to... more
Context Occlusal splints are widely used in clinical practice as a noninvasive treatment for patients with temporomandibular disorders (TMDs) and for reduction of TMD-related symptoms. A force diagram allows a health care professional to evaluate the interactions of loads caused by muscular effort, which are sensed by the teeth and the temporomandibular joint during the protrusive movement of the mandible. Objective To evaluate the efficacy of occlusal splints combined with occlusal adjustment (OA) based on a force diagram in the management of joint sounds (clicking and crepitation). Methods Patients were examined clinically and administered a questionnaire for the diagnosis of TMD and orofacial pain. Patients were then assigned to 1 of 2 splint therapies: (1) an anterior bite plane of the front-plateau type (FP) or (2) a maxillary muscle relaxation appliance (MRA), both combined with OA based on a force diagram performed at 6 visits, with an interval of 24 to 48 hours between each ...
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Research Interests: Physics and Humanities
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Sixty cows were divided in two groups (Group I, n=35; Group II, n=25), this division was realized in 07/12/2007 according to the postpartum days for occasion of artificial insemination (FTAI) in all animals. The average number of... more
Sixty cows were divided in two groups (Group I, n=35; Group II, n=25), this division was realized in 07/12/2007 according to the postpartum days for occasion of artificial insemination (FTAI) in all animals. The average number of postpartum days was 89.4 in the Group I and in the Group II the average number was 65.1 days (p 0,05). However, the pregnancy cost at FTAI was for Group I and Group II, respectively, R$ 83,30 and R$ 148,75. PR-Final resulted in a final cost/ pregnancy of R$ 75,22 and R$ 81,87, respectively for Groups I and II. The cows submitted to the FTAI in different periods postpartum presented different cost/ pregnancy. The variable cost/pregnancy is directly related to the pregnancy rate to the FTAI as well as after the use of clean-up bulls.
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SUMMARY The aim of this laboratory study was to evaluate the pull-out force of a prefabricated fiberglass post (PP), relined fiberglass post (RP), or milled fiberglass post (MP) luted with Multilink N (MN), RelyX Unicem 2 (RXU2) or RelyX... more
SUMMARY The aim of this laboratory study was to evaluate the pull-out force of a prefabricated fiberglass post (PP), relined fiberglass post (RP), or milled fiberglass post (MP) luted with Multilink N (MN), RelyX Unicem 2 (RXU2) or RelyX Ultimate (RU) to enlarged root canals. The thickness of the resin cements and the presence of voids in the resin cement film were observed. The root canals of 90 bovine incisors were enlarged, endodontically treated, and randomly divided into 9 groups (n=10) according to the post type and resin cement. The specimens were scanned using micro-CT to analyze the thickness of the resin cement and the presence of voids. The specimens were submitted to mechanical cyclic loading (500,000 cycles at 50 N load) and subjected to pull-out force testing. Two-way ANOVA and Tukey’s test analyzed the pull-out force and resin cement thickness data. Kruskal-Wallis and Bonferroni tests analyzed the void scores. The interaction between factors (post × resin cement) was ...
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O estudo aborda a autoavaliacao institucional, prevista no Sistema Nacional de Avaliacao da Educacao Superior brasileira (SINAES), como ferramenta de qualificacao e, portanto, de melhoria nas condicoes de permanencia dos discentes... more
O estudo aborda a autoavaliacao institucional, prevista no Sistema Nacional de Avaliacao da Educacao Superior brasileira (SINAES), como ferramenta de qualificacao e, portanto, de melhoria nas condicoes de permanencia dos discentes universitarios. A investigacao tem como foco o Curso de Arquitetura e Urbanismo de uma universidade brasileira e objetiva analisar e avaliar os fatores de insatisfacao e satisfacao relativos ao curso e relaciona-los com a evasao, sucesso e a permanencia. Sem desprezar as oscilacoes na contextualizacao socioeconomica, o estudo foca no tripe: planejamento institucional – gestao pedagogica – avaliacao, com foco nesta ultima, como estrategia de aprimoramento dos processos que facilitam e promovem a permanencia dos estudantes na Universidade. A investigacao integra o projeto “Autoavaliacao na graduacao e na pos-graduacao: estudos sobre a complexidade do ensino e da aprendizagem e acerca do papel formativo da avaliacao”, aprovado pelo parecer do Comite de Etica ...
Research Interests: Physics and Humanities
A autoavaliacao institucional, prevista no Sistema Nacional de Avaliacao da Educacao Superior (SINAES), e utilizada como ferramenta de qualificacao dos cursos de graduacao e, portanto, de promocao da permanencia dos estudantes... more
A autoavaliacao institucional, prevista no Sistema Nacional de Avaliacao da Educacao Superior (SINAES), e utilizada como ferramenta de qualificacao dos cursos de graduacao e, portanto, de promocao da permanencia dos estudantes universitarios. O estudo tem como foco dez cursos de uma Universidade no sul do pais e tem por objetivo analisar e avaliar os fatores de insatisfacao e de satisfacao relativos aos cursos e relaciona-los com a evasao, a permanencia e o exito academico dos discentes. Considerando, tambem, a contextualizacao socioeconomica, o estudo fundamenta-se na articulacao entre o planejamento institucional, a gestao pedagogica dos cursos e a autoavaliacao, com foco nesta ultima, como estrategia de permanente aperfeicoamento dos processos que diminuem a evasao e promovem a permanencia dos estudantes nos cursos da Saude. A investigacao integra o projeto “Autoavaliacao na graduacao e na pos-graduacao: estudos sobre a complexidade do ensino e da aprendizagem e acerca do papel f...
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Objetivo: traduzir e adaptar a Morse Fall Scale da lingua inglesa para a portuguesa. Metodo: realizado em sete etapas: contato eletronico com a autora da escala, para solicitar autorizacao; traducao para o Portugues, avaliacao e... more
Objetivo: traduzir e adaptar a Morse Fall Scale da lingua inglesa para a portuguesa. Metodo: realizado em sete etapas: contato eletronico com a autora da escala, para solicitar autorizacao; traducao para o Portugues, avaliacao e estruturacao, realizadas por comite de especialistas; traducao para o Ingles, validacao da escala, pelo comite de especialistas; avaliacao da clareza dos itens e definicoes operacionais, por 45 profissionais e avaliacao da concordância entre avaliadores quanto aos dados referentes a avaliacao de 90 pacientes, por quatro avaliadores. Resultados: quanto a clareza da escala, as proporcoes foram consideradas muito satisfatorias, com intervalo de confianca entre 73,0% a 100% na opcao “muito claro”. Quanto a concordância das respostas, os resultados apresentaram um Coeficiente Kappa quase perfeito (0,81 a 1,00). Conclusao: os resultados sugerem que o processo de adaptacao da escala foi bem sucedido, indicando que seu uso e apropriado para a populacao de pacientes ...
Research Interests: Philosophy and Humanities
Research Interests: Biology and Beef Cattle
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The aim of this experiment was to study the influence of the supplementation by cultivate pasture on the development and reproductive performance of heifers with a low weight mated at 24 months of age, and the pregnancy probability... more
The aim of this experiment was to study the influence of the supplementation by cultivate pasture on the development and reproductive performance of heifers with a low weight mated at 24 months of age, and the pregnancy probability according to the weight and supplementation as well. The data was collected on 152 heifers (British breed and cross-bred). One group had 100 heifers on native pasture with no supplementation (NS), and the other 52 heifers were supplemented on annual ryegrass pasture (Lolium multiflorum) (SUP). The parameters, which were analyzed, were the average weight gain, weight at the beginning of supplementation (WBS), weight at mating (WM), probability pregnancy rate and pregnancy rate (PR). The supplementation had influence on the average weight gain between 09/19-11/14 (p 0.05). The PR was similar between NS and SUP heifers (88.0% and 90.4%, respectively). Thus, it is possible to conclude that the reproductive performance didn’t show differences between the groups. The SUP group that started the experiment with lower WBS reached higher average weight gain during the period to reach a similar PR than the NS group.
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Research Interests: Biology and Stricto Sensu
Este texto apresenta uma analise da percepcao da qualidade dos cursos de Engenharia de Producao no Brasil e a sua relacao com indicadores de qualidade resultantes de avaliacoes oficiais e nao-oficiais. A percepcao de qualidade foi... more
Este texto apresenta uma analise da percepcao da qualidade dos cursos de Engenharia de Producao no Brasil e a sua relacao com indicadores de qualidade resultantes de avaliacoes oficiais e nao-oficiais. A percepcao de qualidade foi avaliada por meio de uma alternativa da questao numero 26 do Questionario do Estudante do ENADE na qual os estudantes informam o principal motivo de escolha do curso. Os indicadores de qualidade considerados foram o Conceito Preliminar de Curso (CPC) e o Ranking Universitario da Folha (RUF). Para isso, foram utilizadas tecnicas estatisticas de analise de correlacao e concordância entre os resultados de indicadores e do principal motivo de escolha. Os resultados mostraram que os indicadores de qualidade estao direta e moderadamente associados a percepcao de qualidade. O RUF mostrou-se mais correlacionado do que o CPC, sugerindo que a reputacao da instituicao seja um atributo relevante na motivacao de escolha dos estudantes.
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O mercado de cervejas artesanais tem experimentado forte crescimento no pais, oferecendo ampla diversidade de opcoes para diferentes segmentos, tanto no que se refere a qualidade como ao preco. Neste cenario, este trabalho tem por... more
O mercado de cervejas artesanais tem experimentado forte crescimento no pais, oferecendo ampla diversidade de opcoes para diferentes segmentos, tanto no que se refere a qualidade como ao preco. Neste cenario, este trabalho tem por objetivo identificar a demanda de consumo e aceitacao de uma cerveja artesanal na regiao carbonifera do estado do Rio Grande do Sul. O trabalho consiste de um levantamento com proprietarios de bares da regiao para levantar as marcas mais consumidas. Deste levantamento foram extraidas as tres marcas que, juntas, correspondem a 87% do mercado considerado. Estas marcas foram comparadas por meio de um teste cego de degustacao a uma cerveja artesanal realizado por 20 avaliadores. Os resultados apontaram maior preferencia pela cerveja artesanal, com superioridade em todos os quesitos levantados. De acordo com o levantamento, existe demanda na regiao para cervejas artesanais, mas a maioria dos avaliadores nao estaria disposta a pagar mais do que 25% do preco de m...
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