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Development of a sodium fluoride and stannous chloride-containing gel for treatment of dental erosion
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Pereira, Laís Gatti de Souza

; Bezerra, Sávio José Cardoso

; Viana, Ítallo Emídio Lira

; Lima, Leonardo Custódio de

; Borges, Alessandra Bühler

; Scaramucci, Taís

Brazilian Dental Journal

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aug 2022, Volume 33 N. 4 Pages 54 - 61

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo Este estudo desenvolveu e testou géis experimentais contendo íons fluoreto (F-) e estanho (Sn2+) para o controle da erosão dentária. Os espécimes polidos, de esmalte e dentina, foram previamente erodidos (solução de ácido cítrico a 1%, 10 min) e alocados aleatoriamente em 5 grupos (n = 10): Placebo - gel de hidroxipropilmetilcelulose (HMC); F + Sn + HMC - 7.500 ppm F- / 15.000 ppm Sn2+; F + HMC - 7.500 ppm F-; Gel de flúor fosfato acidulado comercial (12.300 ppm F-); e Controle - sem tratamento. Após o tratamento (aplicado por 60 s), os espécimes foram submetidos a uma ciclagem de erosão-remineralização (5 min em solução de ácido cítrico a 0,3%, 60 min em saliva artificial, 4 × / dia, 20 dias). A perda de superfície (SL, em µm) foi determinada após o 5º, 10º e 20º dias de ciclagem (α = 0,05). Para o esmalte, após 5 e 10 dias, o F + Sn + HMC apresentou a menor PS, não diferindo do gel comercial. Após 20 dias, não foram encontradas diferenças entre os grupos comercial, F + HMC e F + Sn + HMC. O placebo não diferiu do controle em nenhum momento, e ambos os grupos apresentaram a maior PS, comparado aos demais grupos. Para dentina, no 5º dia , F + Sn + HMC, F + HMC e comercial não diferiram significativamente, apresentando menor PS que o grupo controle e placebo. No 10º dia, F+Sn+HMC e comercial apresentaram a menor PS comparado ao grupo controle e placebo. No 20º dia, apenas o gel comercial apresentou PS menor que o controle e o placebo. Assim, o gel experimental F + Sn + HMC foi capaz de controlar a progressão da erosão dentária.

Abstract: This study synthesized and tested experimental gels containing fluoride (F-) and stannous (Sn2+) ions for the control of dental erosion. Enamel and dentin polished specimens were eroded (1% citric acid solution, 10 min) and randomly allocated into 5 groups (n=10): Placebo - Hydroxypropyl Methylcellulose (HMC) gel; F+Sn+HMC - 7,500 ppm F- / 15,000 ppm Sn2+; F+HMC - 7,500 ppm F-; Commercial acidulated phosphate fluoride gel (12,300 ppm F-); and Control - no treatment. After treatment (applied for 60 s), specimens underwent an erosion-remineralization cycling (5 min in 0.3% citric acid solution, 60 min in artificial saliva, 4×/day, 20 days). Surface loss (SL, in µm) was determined after the 5th, 10th and 20th days of cycling (α=0.05). For enamel, after 5 and 10 days, F+Sn+HMC presented the lowest SL, which did not differ from the commercial gel. After 20 days, no differences were found between commercial, F+HMC, and F+Sn+HMC groups. Placebo did not differ from the control at any time points, and both groups presented the highest SL when compared to the other groups. For dentin, on the 5th day, F+Sn+HMC, F+HMC and commercial did not differ significantly, showing lower SL than the control and the placebo. On the 10th day, F+Sn+HMC and commercial presented the lowest SL compared to control and placebo. After 20 days, only the commercial gel showed lower SL than the control and placebo. Thus, the experimental F+Sn+HMC gel was able to control the progression of tooth erosion.

https://doi.org/10.1590/0103-6440202204808

Tomographic Analysis of the Anatomical Parameters for the Insertion of Cortical Bone Screws
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Herrero, Carlos Fernando Pereira da Silva

; Marangoni, Rafael Campos Fróes

Revista Brasileira de Ortopedia

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jan 2022, Volume 57 N. 1 Pages 47 - 54

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo Objetivo Estudar os parâmetros anatômicos do trajeto de inserção do parafuso cortical e descrever sua técnica. Métodos Analisaram-se exames de tomografia computadorizada de 30 pacientes, e as medidas nas vértebras de L1 a L5 bilateralmente. Um segundo observador avaliou dez exames aleatoriamente. Os parâmetros incluíram o ângulo lateral (AL) e o diâmetro do parafuso (DP) como variáveis axiais, e o ângulo cranial (AC) e o comprimento do parafuso (CP) como variáveis sagitais. Resultados No total, havia 15 pacientes do sexo masculino (média de idade de 31,33 anos) e 15 do sexo feminino (média de idade de 32,01 anos). O AL variou de 13,8° a 20,89°, com uma tendência de aumento no sentido de proximal a distal. O AC variou de 17,5° a 24,9°, com tendência de diminuição no sentido caudal. O DP variou de 2,3 mm a 7,2 mm, havendo uma tendência ao aumento conforme avançamos de proximal a distal. O CP variou de 19 mm a 45 mm, havendo uma tendência de diminuição conforme avançamos de proximal (L1) a distal (L5). Não houve diferença estatística entre os sexos, nem diferenças na confiabilidade interobservador, quanto aos valores estudados quando comparados os lados. Conclusão A trajetória do parafuso de trajeto cortical apresenta variações em diferentes populações. Assim, recomendamos o estudo pré-operatório de imagens para reduzir os riscos cirúrgicos relacionados à técnica.

Abstract Objective To study the parameters related to the insertion path of cortical screws and to describe this technique. Methods Computed tomography (CT) scans of 30 patients, as well as the measurements from the L1 to the L5 vertebrae, were studied. A second observer evaluated ten randomly-selected exams. The parameters studied included the lateral angle (LA) and the screw diameter (SD) as axial variables, and the cranial angle (CA) and screw length (SL) as sagittal variables. Results We studied 15 male patients (mean age: 31.33 years) and 15 female patients (mean age: 32.01 years). The LA varied between 13.8° and 20.89°, with a tendency to increase in the proximal to distal direction. The CA varied from 17.5° to 24.9°, with a tendency to decrease in the caudal direction. The SD ranged from 2.3 mm to 7.2 mm, with a tendency to increase as we progressed from proximal to distal. The SL varied from 19 mm to 45 mm, with a tendency to decrease as we proceeded from proximal (L1) to distal (L5). No statistical difference was observed between the genders or in the interobserver agreement regarding the values studied when comparing the sides. Conclusion The path of insertion of the cortical screw shows a variation in different populations. Therefore, we recommend a preoperative imaging study to reduce the surgical risks related to the technique.

https://doi.org/10.1055/s-0041-1731672

Effects of phytochemical extracts on smear layer removal in root canal treatment
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Pereira Otoni, Rejane

; Carvalho de Oliveira Santos, Carolina

; Kennedy Barroso, Gabriel

; Rabelo Fonseca, Julia

; Silva de Rezende, Vanessa

; Fonseca-Silva, Thiago

Revista Cubana de Estomatología

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sep 2021, Volume 58 N. 3 elocation e3639

Abstract: En Es | Text: En Es | PDF: En | PDF: Es

ABSTRACT Introduction: Studies suggested that phytochemical products are considered potential solutions to smear layer removal due to their biological safety in cleaning root canal systems, lower toxicity, lower irritant effect and antimicrobial effect. Objective: The aim of the present study was to perform a systematic review to evaluate smear layer removal of root canal systems by different natural product solutions. Methods: systematic review. Search of the literature was performed on Pubmed, Scopus, Cochrane, Web of Science, Scielo and Google Scholar according the PRISMA protocol. Studies were included if they performed the experiments of smear layer removal on extracted permanent human teeth. Articles published in any language without restriction of year of publication were included in this review. The risk of bias assessment in the included studies was evaluated using the Joanna Briggs Institute Critical Appraisal Checklist for Quasi-Experimental Studies. The search strategy resulted in the retrieval of 6221 publications. After the eligibility criteria application, 8 articles were selected for analysis. Results: It was observed that some natural products solutions showed effects on smear layer removal, especially on coronal third. The phytochemical products such as Salvadora persica, chamomile alcohol extract and grape seed extract demonstrated good potential of smear layer removal, however, its effectiveness and clinical applicability are still unclear. Conclusions: Although the limitations of this study, it is possible to highlight those phytochemical products such as Salvadora persica, chamomile alcohol extract and grape seed extract that demonstrated good potential on SL removal.

RESUMEN Introducción: Los productos fitoquímicos se consideran soluciones potenciales para la eliminación del barro dentinario debido a su seguridad biológica en la limpieza del sistema de conductos radiculares, menor toxicidad, menor efecto irritante y efecto antimicrobiano. Objetivo: Evaluar la eliminación del barro dentinario de los sistemas de conductos radiculares mediante diferentes soluciones de productos naturales. Métodos: La búsqueda de la literatura se realizó en Pubmed, Scopus, Cochrane, Web of Science, SciELO y Google Scholar, según el protocolo PRISMA. Los estudios se incluyeron si realizaron los experimentos de eliminación del barro dentinario en dientes humanos permanentes extraídos. En esta revisión se incluyeron artículos publicados en cualquier idioma, sin restricción de año de publicación. La evaluación del riesgo de sesgo en los estudios incluidos se evaluó mediante la lista de verificación de evaluación crítica del Instituto Joanna Briggs para estudios cuasiexperimentales. La estrategia de búsqueda resultó en la recuperación de 6221 publicaciones. Después de la aplicación de los criterios de elegibilidad, se seleccionaron 8 artículos para su análisis. Resultados: Se observó que algunas soluciones de productos naturales mostraron efectos sobre la eliminación del barro dentinario, especialmente en el tercio coronal. Los productos fitoquímicos como salvadora pérsica, extracto de alcohol de manzanilla y extracto de semilla de uva demostraron un buen potencial de eliminación del barro dentinario; sin embargo, su efectividad y aplicabilidad clínica aún no están claras. Conclusiones: A pesar de las limitaciones de este estudio, es posible destacar aquellos productos fitoquímicos como salvadora pérsica, extracto de alcohol de manzanilla y extracto de semilla de uva demostraron buen potencial de eliminación del barro dentinario.

Concentration of soybean lecithin affects short-term storage success of goat semen related with seminal plasma removal
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Silva, Robespierre Augusto Joaquim Araújo

; Batista, André Mariano

; Arruda, Lúcia Cristina Pereira

; Souza, Helder Melo de

; Nery, Igor Henrique de Azevedo Valença

; Gomes, Wilton Arruda

; Soares, Pierre de Castro

; Silva, Sildivane Valcácia

; Guerra, Maria Madalena Pessoa

Animal Reproduction

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oct 2019, Volume 16 N. 4 Pages 895 - 901

Abstract: En | Text: En | PDF: En

Abstract The objective of this study was to investigate the need of seminal plasma removal for short-term cooling of buck semen in soybean lecithin (SL) based extender. Each pool was divided equally, and one half was subjected to centrifugation to remove seminal plasma (SP-), while the other half remained with seminal plasma (SP+). Then, both SP+ and SP- samples were diluted in two SL extenders (extender A = 1% SL; extender B = 2% SL), cooled to 5ºC and stored for 48 hours. The sperm kinetics, evaluated by CASA, and plasma membrane integrity (PMI), acrosomal integrity (ACI) and high mitochondrial membrane potential (HMMP), evaluated by epifluorescence microscopy, were determined within five minutes after reaching 5°C (T0), as well as after 24 (T24) and 48 (T48) hours of storage. Interactions (seminal plasma vs. extender vs. time;) were observed for all variables assessed. Total and progressive motility and other variables of sperm kinetics decreased after 24 hours of cooling in the SP+ group, and after 48 hours of storage, these same variables were lower in SP+/B compared to SP-/B groups. Furthermore, SP+ reduced PMI (extender B, T48), HMMP (A and B extenders, T48) and ACI (extender A, T0) compared to SP- samples. The interactions between seminal plasma and soybean lecithin phospholipids seemed to occur in a time-dependent manner. It was concluded that the removal of seminal plasma improves the quality of goat semen that was cooled in a soybean lecithin-based extender, especially when using 2% soybean lecithin.

https://doi.org/10.21451/1984-3143-ar2019-0012 957 downloads

Caracterizando os itens de química do novo ENEM na perspectiva da alfabetização científica
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Pereira, Rafaela Erasmi de Souza

; Moreira, Leonardo Maciel

Ciência & Educação (Bauru)

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apr 2018, Volume 24 N. 2 Pages 467 - 480

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Resumo: O objetivo desta pesquisa é analisar em que medida os itens de química do Exame Nacional do Ensino Médio (ENEM) no período 2009-2015 avaliam a alfabetização científica (AC). Ela dialoga com pesquisas anteriores por discutir a coerência interna do exame e avança por elencar um novo aspecto, a AC. O método utilizado é qualitativo. A matriz de referência e os itens de química foram tratados por análise de conteúdo, com a atribuição em categorias teóricas. Os dados revelaram divergências entre as habilidades e competências pertinentes a AC presentes na matriz de referência e nos itens de química, respectivamente, 17,4% e 86,6% (categoria Termos, conhecimentos e conceitos científicos fundamentais), 65,2% e 13,4% (categoria Ciência, tecnologia, sociedade e meio ambiente) e 17,4% e 0% (categoria natureza da ciência e dos fatores éticos e políticos). Ao final, recomenda-se que o exame avalie, de forma significativa, todas as proposições da AC presentes na matriz de referência.

Abstract: The objective of this research is to analyse to what extent the chemistry issues of National High School Examination (ENEM) during 2009-2015 evaluate the scientific literacy (SL). It dialogues with previous research to discuss the internal consistency of the exam and moves forward by listing a new aspect, SL. The method used is qualitative. A reference matrix and chemistry issues were treated by content analysis, with an assignment in theoretical categories. The results showed a divergence between the relevant skills and competences referring to SL and presents in a reference matrix the chemistry issues, respectively, 17.4% and 86.6% (category Terms, knowledge and fundamental scientific concepts), 65.2% and 13.4% (category Science, technology, society and environment) and 17.4% and 0% (category nature of science and ethical and political factors). In the end, it is recommended that the exam evaluate, significantly, all the SL’s proposals presented in reference matrix.

https://doi.org/10.1590/1516-731320180020013 2056 downloads

Sporotrichoid leishmaniasis: a cross-sectional clinical, epidemiological and laboratory study in Rio de Janeiro State, Brazil
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Carvalho, Livia Martins Veloso de

; Pimentel, Maria Inês Fernandes

; Conceição-Silva, Fátima

; Vasconcellos, Érica de Camargo Ferreira e

; Valete-Rosalino, Cláudia Maria

; Lyra, Marcelo Rosandiski

; Salgueiro, Mariza de Matos

; Saheki, Maurício Naoto

; Madeira, Maria de Fátima

; Mouta-Confort, Eliame

; Antonio, Liliane de Fátima

; Silva, Aline Fagundes da

; Quintella, Leonardo Pereira

; Bedoya-Pacheco, Sandro Javier

; Schubach, Armando de Oliveira

Revista do Instituto de Medicina Tropical de São Paulo

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2017, Volume 59 elocation e33

Abstract: En | Text: En | PDF: En

ABSTRACT Background Atypical presentations of cutaneous leishmaniasis include sporotrichoid leishmaniasis (SL), which is clinically described as a primary ulcer combined with lymphangitis and nodules and/or ulcerated lesions along its pathway. Aims To assess the differences between patients with sporotrichoid leishmaniasis and typical cutaneous leishmaniasis (CL). Methods From January 2004 to December 2010, 23 cases of SL (4.7%) were detected among 494 CL patients diagnosed at a reference center for the disease in Rio de Janeiro State, Brazil. These 23 cases were compared with the remaining 471 patients presenting CL. Results SL predominated in female patients (60.9%, p = 0.024), with older age (p = 0.032) and with lesions in upper limbs (52.2%, p = 0.028). CL affected more men (64.5%), at younger age, and with a higher number of lesions exclusively in lower limbs (34.8%). Conclusions Differences in clinical and epidemiological presentation were found between SL patients as compared to CL ones, in a region with a known predominance of Leishmania (Viannia) braziliensis. The results are similar to the features of most of the sporotrichosis patients as described in literature, making the differential diagnosis between ATL and sporotrichosis more important in overlapping areas for both diseases, like in Rio de Janeiro State.

https://doi.org/10.1590/s1678-9946201759033 1564 downloads

CARACTERIZAÇÃO GEOTÉCNICA E CLASSIFICAÇÃO DE SOLOS PARA ESTRADAS FLORESTAIS: ESTUDO DE CASO
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Emmert, Fabiano

; Pereira, Reginaldo Sérgio

Ciência Florestal

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jun 2016, Volume 26 N. 2 Pages 601 - 613

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO O estudo teve como objetivo realizar a caracterização geotécnica e a classificação rodoviária para utilização apropriada de diferentes solos locais como materiais de construção de estradas florestais. O estudo foi realizado em áreas florestais no município de Niquelândia, Goiás, Brasil. Coletaram-se solos finos e granulares predominantes, denominados SL e HA, respectivamente. Os solos foram submetidos a ensaios geotécnicos apropriados para obras rodoviárias, identificando os grupos pertencentes de acordo com as metodologias de classificação TRB e MCT. Os resultados demonstram que o solo SL, com fração predominante de areia fina, possui baixa plasticidade e pertence aos grupos A-4(1) e LA', segundo TRB e MCT, respectivamente. A tensão suportada alcançou 385,10 kPa na maior energia de compactação. A capacidade de suporte foi maior na energia de compactação intermediária. Para o solo granular HA, a fração predominante foi de pedregulho fino e seu enquadramento no grupo TRB foi A-1-b. Segundo a metodologia MCT, o solo SL é material prioritário para base e subleito de estradas. O comportamento esperado para o solo SL é satisfatório como material empregado no subleito, e o HA, excelente, segundo a classificação TRB. A capacidade de suporte dos solos SL e HA indicam que devem ser empregados como reforço de subleito e base, respectivamente. Em estradas florestais, o solo SL pode ser empregado como subleito e HA como base ou revestimento primário.

ABSTRACT The study aimed to carry out geotechnical characterization and road classification for proper use of different local soils, as construction materials for forest roads. The study was performed in plantation forest areas in the municipality of Niquelândia, Goiás, Brazil. Predominant fine and course soils have been collected, which were called as SL and HA, respectively. Soil samples were submitted to appropriate geotechnical tests for road infrastructures, identifying the pertaining groups in accordance with the methodologies of TRB and MCT classifications. The results demonstrate that SL soil has predominant fraction of fine sand and low plasticity, classified as A-4(1) and LA' groups, in according to TRB and MCT classifications, respectively. The supported tension for this soil reached 385.10 kPa on highest energy of compacting. The highest support capacity was reached on intermediate energy of compacting. For HA soil, the predominant fraction was fine gravel and it has fitted into TRB group as A-1-b soil. According to MCT methodology, SL soil is a priority material for base and subgrade of roads. The expected behavior for SL soil was satisfactory as a useful material for subgrade, whereas HA soil was considered as excellent, both in according to TRB classification. The support capacity of SL and HA soils indicates they must be used as reinforcement of subgrade and base, respectively. For forest roads, SL soil is recommended for subgrade and HA for base or primary layer.

https://doi.org/10.5902/1980509822760 8641 downloads

I DIRETRIZ DE INSUFICIÊNCIA CARDÍACA (IC) E TRANSPLANTE CARDÍACO, NO FETO, NA CRIANÇA E EM ADULTOS COM CARDIOPATIA CONGÊNITA, DA SOCIEDADE BRASILEIRA DE CARDIOLOGIA
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Azeka, E

; Jatene, MB

; Jatene, IB

; Horowitz, ESK

; Branco, KC

; Souza Neto, JD

; Miura, N

; Mattos, S

; Afiune, JY

; Tanaka, AC

; Santos, CCL

; Guimarães, ICB

; Manso, PH

; Pellizari, RCRS

; Santos, MVC

; Thomaz, AM

; Cristofani, LM

; Ribeiro, ACL

; Kulikowski, LD

; Sampaio, MC

; Pereira, AC

; Soares, AM

; Soares Junior, J

; Oh, GHY

; Moreira, V

; Mota, CCC

; Afiune, CMC

; Pedra, C

; Pedra, S

; Pedrosa, A

; Guimarães, V

; Caneo, LF

; Ferreiro, CR

; Cavalheiro Filho, C

; Stefanello, B

; Negrão, CE

; Turquetto, ALR

; Mesquita, SMF

; Maeda, WT

; Zorzanelli, L

; Panajotopolos, N

; Siqueira, AWS

; Galas, FRB

; Hajjar, LA

; Benvenuti, LA

; Vincenzi, P

; Odone, V

; Lopes, MH

; Strabelli, TMV

; Franchi, SM

; Takeuti, AD

; Duarte, MF

; Leon, RGP

; Hermida, RPM

; Sorpreso, ICE

; Soares Junior, JM

; Melo, NR

; Baracat, EC

; Bortolotto, MRFL

; Scanavacca, M

; Shimoda, MS

; Foronda, G

; Romano, BW

; Silva, DB

; Omura, MM

; Barbeiro, CPM

; Vinhole, ARG

; Palomo, JSH

; Gonçalves, MAB

; Reis, ICF

; Oliveira, LG

; Ribeiro, CC

; Isosaki, M

; Vieira, LP

; Feltrim, MIZ

; Manoel, LA

; Abud, KCO

; Paschotto, DR

; Neves, ILI

; Senaha, LE

; Garcia, ACCN

; Cipriano, SL

; Santos, VG

; Ferraz, AS

; Moreira, AELC

; De Paulo, ARSA

; Duque, AMPC

; Trindade, E

; Bacal, F

; Auler Junior, JOC

; Almeida, DR

Arquivos Brasileiros de Cardiologia

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dec 2014, Volume 103 N. 6 Pages 1 - 126

Abstract: Pt | Text: Pt | PDF: Pt

https://doi.org/10.5935/abc.2014S005 54402 downloads

Thinking better about high-quality science: A look at some ethical flaws and productivity evaluation
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Eisenlohr, PV

; Tavares JR,

; Oliveira, SL

; Santos, AO

; Valadão, MBX

; Bilce, JM

; Roberto, RL

; Castro, HB

; Zaratim, ECP

; Lima, SL

; Santos, AJ

; Silva, APG

; Lima, LB

; Melo-Santos, KS

; Figueiredo, JDS

; Santos, LM

; Pereira, FC

; Oliveira, JCA

; Miguel, TB

; Serpa, AO

; Kreutz, C

; Reis, SMA

Brazilian Journal of Biology

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nov 2014, Volume 74 N. 4 Pages 1009 - 1010

Abstract: En | Text: En | PDF: En

https://doi.org/10.1590/1519-6984.17413 1772 downloads

10.

Effects of solvent evaporation on water sorption/solubility and nanoleakage of adhesive systems
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CHIMELI, Talita Baumgratz Cachapuz

; D'ALPINO, Paulo Henrique Perlatti

; PEREIRA, Patrícia Nóbrega

; HILGERT, Leandro Augusto

; DI HIPÓLITO, Vinicius

; GARCIA, Fernanda Cristina Pimentel

Journal of Applied Oral Science

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jul 2014, Volume 22 N. 4 Pages 294 - 301

Abstract: En | Text: En | PDF: En

Objective: To evaluate the influence of solvent evaporation in the kinetics of water diffusion (water sorption-WS, solubility-SL, and net water uptake) and nanoleakage of adhesive systems. Material and Methods: Disk-shaped specimens (5.0 mm in diameter x 0.8 mm in thickness) were produced (N=48) using the adhesives: Clearfil S3 Bond (CS3)/Kuraray, Clearfil SE Bond - control group (CSE)/Kuraray, Optibond Solo Plus (OS)/Kerr and Scotchbond Universal Adhesive (SBU)/3M ESPE. The solvents were either evaporated for 30 s or not evaporated (N=24/per group), and then photoactivated for 80 s (550 mW/cm2). After desiccation, the specimens were weighed and stored in distilled water (N=12) or mineral oil (N=12) to evaluate the water diffusion over a 7-day period. Net water uptake (%) was also calculated as the sum of WS and SL. Data were submitted to 3-way ANOVA/Tukey's test (α=5%). The nanoleakage expression in three additional specimens per group was also evaluated after ammoniacal silver impregnation after 7 days of water storage under SEM. Results: Statistical analysis revealed that only the factor "adhesive" was significant (p<0.05). Solvent evaporation had no influence in the WS and SL of the adhesives. CSE (control) presented significantly lower net uptake (5.4%). The nanoleakage was enhanced by the presence of solvent in the adhesives. Conclusions: Although the evaporation has no effect in the kinetics of water diffusion, the nanoleakage expression of the adhesives tested increases when the solvents are not evaporated.

https://doi.org/10.1590/1678-775720130653 2485 downloads

11.

Apical transportation associated with ProTaper® Universal F1, F2 and F3 instruments in curved canals prepared by undergraduate students
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BRITO-JÚNIOR, Manoel

; FARIA-E-SILVA, André Luis

; CAMILO, Carla Cristina

; PEREIRA, Rodrigo Dantas

; BRAGA, Neilor Mateus Antunes

; SOUSA-NETO, Manoel Damião

Journal of Applied Oral Science

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apr 2014, Volume 22 N. 2 Pages 98 - 102

Abstract: En | Text: En | PDF: En

Objective: This study evaluated apical transportation associated with ProTaper® Universal Fl, F2 and F3 rotary files in curved canais prepared by undergraduate students. Material and Methods: Twenty mesial roots of mandibular molars with curvatures ranging between 25° and 35° were selected. Mesiobuccal canals were instrumented by twenty students with the ProTaper® system (Dentsply-Maillefer, Ballaigues, Switzerland) according to the manufacturer's instructions. Pre-fiaring was performed with Sl and SX files. A #15 K-file was inserted into the root canal up to the working length (WL), and an initial digital radiograph was taken in a buccolingual direction (baseline). Afterwards, the S1, S2, F1, F2, and F3 files were employed up to the WL. Other radiographies were taken in the same orientation of the baseline after the use of the Fl, F2, and F3 files, with each file inserted into the root canal. The radiographic images were overlapped, and the Image J software was used to measure the distance between the rotary files' ends and the #15 K-file's end, characterizing the apical transportation. Data were analyzed by Repeated Measure ANOVA and by the SNK post hoc test (P<0.05). Results: It was verified that file size affected apical transportation significantly (P<0.001). The F3 file showed higher apical transportation than Fl and F2, while between these last files there was no difference. Conclusion: The undergraduate students produced lower apical transportation in curved canals when they did not use the F3 rotary file.

https://doi.org/10.1590/1678-775720130464 2651 downloads

12.

Influência dos jatos em médios e baixos níveis nos processos de nuvem: estudo numérico de uma linha de instabilidade amazônica
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Alcântara, Clênia Rodrigues

; Souza, Enio Pereira de

; Dias, Maria Assunção Faus da Silva

; Biezato, Bruno

Revista Brasileira de Meteorologia

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mar 2014, Volume 29 N. 1 Pages 29 - 46

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

As linhas de instabilidade (LI) são tempestades multicelulares e é bem conhecido que fatores como o cisalhamento vertical do vento podem agir para organizar a convecção, porém há poucos indícios de como jatos de médios e baixos níveis podem alterar os processos de nuvens e, por sua vez, interferir na intensidade, duração e propagação desses sistemas. Este trabalho tenta mostrar esse papel utilizando um caso de LI amazônica simulada a partir de um perfil atmosférico do vento em Belém - PA às 12:00 UTC do dia 30 de maio de 2008. Para isso, uma série de 8 experimentos numéricos, alterando-se o perfil do vento e utilizando-se o BRAMS, foi realizada. Os resultados mostraram que com a ocorrência de um jato profundo e intenso até os médios níveis pode haver uma maior ventilação nas nuvens, implicando em mais evaporação e secagem, ou seja, maior entranhamento. O entranhamento sendo maior pode interferir nas correntes descendentes, nas piscinas frias, na convergência à frente do sistema e nas correntes ascendentes, de forma que mais energia pode estar disponível para o sistema. Assim, as LI têm maior possibilidade de se propagarem com maior velocidade e perdurarem por mais tempo.

Squall lines (SL) are multicellular storms and it is well known that factors such as vertical wind shear can act to organize their convection. However there is few evidences of how medium and low level jets can alter the cloud processes, and as a consequence to affect the intensity, duration and propagation of such systems. This work attempts to clarify those jets role by discussing a simulated case of an Amazon SL based on an atmospheric wind profile over Belem - Brazil at 12:00 UTC of May 30, 2008. To accomplish the proposed goal a set of eight numeric experiments, with different wind profiles was performed using the BRAMS model. The results showed that the occurrence of a deep and intense jet may increase ventilation in clouds, resulting in more evaporation and drying, i.e. more mass entrainment. If the entrainment is higher, it can influence downdrafts, cold pools, convergence ahead of the system, and updrafts, so that more energy can be available to the system. Thus, under these conditions SL are more likely to propagate at higher speed with longer life time.

5830 downloads Cited 1 time in SciELO

13.

A directed approach for the identification of transcripts harbouring the spliced leader sequence and the effect of trans-splicing knockdown in Schistosoma mansoni
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Mourao, Marina de Moraes

; Bitar, Maina

; Lobo, Francisco Pereira

; Peconick, Ana Paula

; Grynberg, Priscila

; Prosdocimi, Francisco

; Waisberg, Michael

; Cerqueira, Gustavo Coutinho

; Macedo, Andrea Mara

; Machado, Carlos Renato

; Yoshino, Timothy

; Franco, Gloria Regina

Memórias do Instituto Oswaldo Cruz

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sep 2013, Volume 108 N. 6 Pages 707 - 717

Abstract: En | Text: En | PDF: En

Schistosomiasis is a major neglected tropical disease caused by trematodes from the genus Schistosoma. Because schistosomes exhibit a complex life cycle and numerous mechanisms for regulating gene expression, it is believed that spliced leader (SL) trans-splicing could play an important role in the biology of these parasites. The purpose of this study was to investigate the function of trans-splicing in Schistosoma mansoni through analysis of genes that may be regulated by this mechanism and via silencing SL-containing transcripts through RNA interference. Here, we report our analysis of SL transcript-enriched cDNA libraries from different S. mansoni life stages. Our results show that the trans-splicing mechanism is apparently not associated with specific genes, subcellular localisations or life stages. In cross-species comparisons, even though the sets of genes that are subject to SL trans-splicing regulation appear to differ between organisms, several commonly shared orthologues were observed. Knockdown of trans-spliced transcripts in sporocysts resulted in a systemic reduction of the expression levels of all tested trans-spliced transcripts; however, the only phenotypic effect observed was diminished larval size. Further studies involving the findings from this work will provide new insights into the role of trans-splicing in the biology of S. mansoni and other organisms. All Expressed Sequence Tags generated in this study were submitted to dbEST as five different libraries. The accessions for each library and for the individual sequences are as follows: (i) adult worms of mixed sexes (LIBEST_027999: JZ139310 - JZ139779), (ii) female adult worms (LIBEST_028000: JZ139780 - JZ140379), (iii) male adult worms (LIBEST_028001: JZ140380 - JZ141002), (iv) eggs (LIBEST_028002: JZ141003 - JZ141497) and (v) schistosomula (LIBEST_028003: JZ141498 - JZ141974).

https://doi.org/10.1590/0074-0276108062013006 3127 downloads

14.

Ativação muscular do quadril e do joelho em duas aterrissagens realizadas por atletas do sexo masculino
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Leporace, Gustavo

; Praxedes, Jomilto

; Pereira, Glauber Ribeiro

; Chagas, Daniel

; Pinto, Sérgio

; Batista, Luiz Alberto

Revista Brasileira de Medicina do Esporte

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oct 2011, Volume 17 N. 5 Pages 324 - 328

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

OBJETIVO: Comparar a atividade muscular antes e após o contato com o solo entre as aterrissagens unilateral (AU) e bilateral (AB) em atletas do sexo masculino. PARTICIPANTES: Quinze atletas masculinos de voleibol sem sinais e sintomas de lesões nas extremidades inferiores (13 ± 1 ano, 1,70 ± 0,12m, 60 ± 12kg). MENSURAÇÕES:Os participantes realizaram dois saltos verticais, aterrissando unilateralmente e bilateralmente. A atividade mioelétrica do reto femoral (RF), bíceps femoral (BF), adutores de quadril (AQ) e a relação BF/RF foram comparados entre as duas aterrissagens e entre as fases caracterizadas por 100ms antes (PRE) e 100ms após (POS) o contato com o solo. RESULTADOS: Em ambas as aterrissagens, a ativação do RF foi maior na fase POS em relação à PRE. Na comparação entre as aterrissagens dentro da mesma fase não encontramos diferenças estatísticas. Apesar de o BF não ter apresentado diferenças entre as fases PRE e POS em cada aterrissagem, sua ativação foi maior na AU. Os AQ apresentaram maior ativação na fase POS durante a AU, no entanto não houve diferenças quando comparadas as duas aterrissagens. A relação BF/RF apresentou valores maiores em ambas as aterrissagens na fase PRE. No entanto, não encontramos diferenças entre as aterrissagens. CONCLUSÃO: Os resultados sugerem que cada músculo apresenta um papel diferente durante a fase de aterrissagem em homens. Enquanto que o RF possui como principal função a frenagem da articulação do joelho e do movimento descendente, caracterizada pelo aumento da ativação na fase pós-contato, o BF parece atenuar a tensão articular do joelho em atividades de maior impacto, mantendo-se mais ativo durante todo o ciclo da AU. Já a maior ativação dos AQ após o contato com solo na AU evidencia a importância da região lombo-pélvica na estabilização pélvica em situações de grande instabilidade. Estudos futuros são necessários para determinar os efeitos da ativação muscular apresentada na imposição de cargas mecânicas potencialmente lesivas no joelho em atletas do sexo masculino.

OBJECTIVE: To compare the myoelectric activity before and after ground contact between single leg (SL) and double leg (DL) landings in male athletes. PARTICIPANTS: Fifteen male volleyball athletes without signs and symptoms of lesions in the lower extremities, with a minimum of three years experience in the sport (13 ± 1 years, 1.70 ± 0.12 m, 60 ± 12 kg). MEASUREMENTS: Participants performed two vertical jumps, landing unilaterally and bilaterally. The myoelectric activity of the rectus femoris (RF), biceps femoris (BF), hip adductors (HA) and the BF/RF ratio were compared between the two landings and between the phases characterized by 100ms before (PRE) and after 100 ms (POST) ground contact using ANOVA two-way test with post hoc test of Bonferroni (α = 5%). RESULTS: In both landings activation of RF was higher in the POST in relation to the PRE (p <0.0001). Comparing the landings in the same phase statistical differences (p = 0.2212) were not found. Although the BF did not present significant differences between the PRE and POST in each landing (p = 0.2321), its activation was higher in SL (p = 0.0051). The HA showed greater activation in the POST during the SL (p = 0.0013), however there were no differences when comparing the two landings (p = 0.9233). The BF/RF ratio was higher in both landings during PRE (p = 0.0012). Nevertheless, no differences between the landings (p = 0.7037) were found. CONCLUSION: The results suggest that each muscle has a different role during landing tasks in men. While RF has the main function to decelerate the knee and the downward movement, characterized by increased activation in the POST, BF seems to attenuate the loads on the knee in activities of higher impact, staying more active throughout the cycle in the SL. The increased activation of HA after ground contact in the SL highlights the importance of core region in stabilizing the pelvis in situations of great instability. Further studies are needed to determine the effects of muscle activation at the imposition of mechanical load on the knee that are potentially harmful to male athletes.

11296 downloads

15.

Cover layers to the growth of trees and shrobs over a sulfide spoil from gold mining
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Assis, Igor Rodrigues de

; Dias, Luiz Eduardo

; Abrahão, Walter Antônio Pereira

; Ribeiro Jr, Emerson Silva

; Mello, Jaime Wilson Vargas de

Revista Árvore

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aug 2011, Volume 35 N. 4 Pages 941 - 947

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Este trabalho foi desenvolvido em área de mineração de ouro no Município de Paracatu, MG, Brasil, durante o período de março de 2000 a novembro de 2005. O substrato estudado foi um filito que contém sulfetos como pirita e arsenopirita. O objetivo deste trabalho foi avaliar a sobrevivência e crescimento de espécies vegetais sobre diferentes combinações de camadas de cobertura e de selamento sobre um substrato sulfetado. O tratamento 1 possuía saprolito (B1) na camada selante (SL) e B1 com calagem (B1L) na camada de cobertura (CL). O tratamento 2 possuía B1 na SL e B1L + solo com calagem (SoL) como CL. O tratamento 3 possuía B1 + SoL como SL e B1L como CL. O tratamento 4 possuía B1 + SoL como SL e B1L + SoL como CL. As espécies utilizadas foram Acacia farnesiana, A. holosericea, A. polyphylla, Albizia lebbeck, Clitoria fairchildiana, Flemingia sp., Mimosa artemisiana, M. bimucronata e Enterolobium contortisiliquum. Aos 40 e 57 meses após o plantio foram avaliados diâmetro do colo, altura e contagem das plantas vivas. A maior taxa de sobrevivência (80%) foi observada no tratamento com presença de horizonte B latossólico nas camadas selante e cobertura. De modo geral, M. bimucronata e A. farnesiana mostraram as mais altas taxas de sobrevivência. A teor de arsênio extraído por Mehlich 3 na camada de cobertura variou de 0,00 a 14,69 mg dm-3 entre os tratamentos. Os resultados indicaram que a utilização de diferentes camadas sobre o substrato sulfetado permite a rápida revegetação da área remanescente de mineração.

This work was done at a gold mine company in Paracatu, MG, Brazil, and was conducted from March 2000 to November 2005. The substrate (spoil) studied was a phillite rock which contains sulfides such as pyrite and arsenopyrite. This study aimed to evaluate the survival and growth of plant species on different combinations of substrate layers over the spoil. These layers were a cover layer and a sealing layer, both deposited over the spoil. The treatment 1 had saprolite (B1) in the sealing layer (SL) and B1 with liming (B1L) in the cover layer (CL). The treatment 2 had B1 in SL and B1L + soil with liming (SoL) in the CL. The treatment 3 had B1 + SoL in the SL and B1L in the CL. The treatment 4 had B1 + SoL in the SL and B1L + SoL in the CL. The plant species used were Acacia farnesiana, A. holosericea, A. polyphylla, Albizia lebbeck, Clitoria fairchildiana, Flemingia sp., Mimosa artemisiana, M. bimucronata e Enterolobium contortisiliquum. Forty and 57 months after planting, collardiameter, height, and living plants were evaluated. The greatest survival rate was oobservedintreatmentwith B horizon of an Oxisoil in both layers, with 80 %. In general, M. bimucronata and A. farnesiana species showed the highest survival rate. The arsenic-content by Mehlich 3 in the cover layer ranged from 0.00 to 14.69 mg dm- 3 among treatments. The experimental results suggest that layers combinations above the sulfide substrate allow the rapid revegetation of the spoil.

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