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Evaluation of peripheral nerve fibers and mast cells in burning mouth syndrome
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ARANTES, Diego Antonio Costa
; TOLEDO, Ítalo Cordeiro de
; DE ARRUDA, José Alcides Almeida
; MESQUITA, Ricardo Alves
; CASTRO, Luciano Alberto de
; BATISTA, Aline Carvalho
; RIBEIRO-ROTTA, Rejane Faria
.
Abstract Emerging evidence has revealed a cross-talk in the etiopathogenesis of burning mouth syndrome (BMS) related to peripheral nerve fibers (NF) and neuropeptides secreted by mast cells. Here, we investigated the S-100+ density and PGP 9.5+ integrity of peripheral NF and the tryptase+ mast cell density in the oral mucosa of BMS patients and healthy individuals. A total of 23 oral mucosa specimens (12 BMS and 11 controls) were evaluated. The clinical diagnosis of BMS was based on a careful examination, excluding other local and systemic causes. Samples were taken from an incisional biopsy of the tongue mucosa of individuals with symptomatic BMS, while the margins of the non-neoplastic tongue biopsy served as controls of healthy individuals. Immunohistochemistry was performed to determine the density/mm2 of S-100+, PGP 9.5+ peripheral NF, and tryptase+ mast cells. Similar densities of S-100+, PGP 9.5+ peripheral NF, and tryptase+ mast cells were found in cases of BMS, with a median value of 3.70, 0.70, and 29.24/mm2, respectively, and in the control group, with a median value of 2.60, 0.80, and 26.01/mm2, respectively (p > 0.05). Moreover, the relationship between S100+ and PGP 9.5+ peripheral NF was the same in both groups (p = 0.70). This study demonstrated that there were no alterations in the density and integrity of peripheral NF in the tongue of symptomatic BMS patients. However, the sensitization of peripheral NF in this disease may not depend on mast cell density.
2.
Guidelines on COVID-19 vaccination in patients with immune-mediated rheumatic diseases: a Brazilian Society of Rheumatology task force
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Tavares, Anna Carolina Faria Moreira Gomes
; Melo, Ana Karla Guedes de
; Cruz, Vítor Alves
; Souza, Viviane Angelina de
; Carvalho, Joana Starling de
; Machado, Ketty Lysie Libardi Lira
; Valadares, Lilian David de Azevedo
; Reis Neto, Edgard Torres dos
; Rezende, Rodrigo Poubel Vieira de
; Guimarães, Maria Fernanda Brandão de Resende
; Ferreira, Gilda Aparecida
; Braz, Alessandra de Sousa
; Vieira, Rejane Maria Rodrigues de Abreu
; Pinheiro, Marcelo de Medeiros
; Ribeiro, Sandra Lúcia Euzébio
; Bica, Blanca Elena Gomes Rios
; Baptista, Kátia Lino
; Costa, Izaias Pereira da
; Marques, Claudia Diniz Lopes
; Lopes, Maria Lúcia Lemos
; Martinez, José Eduardo
; Giorgi, Rina Dalva Neubarth
; Mota, Lícia Maria Henrique da
; Loures, Marcos Antônio Araújo da Rocha
; Paiva, Eduardo dos Santos
; Monticielo, Odirlei André
; Xavier, Ricardo Machado
; Kakehasi, Adriana Maria
; Pileggi, Gecilmara Cristina Salviato
.
Abstract Objective: To provide guidelines on the coronavirus disease 2019 (COVID-19) vaccination in patients with immune-mediated rheumatic diseases (IMRD) to rheumatologists considering specific scenarios of the daily practice based on the shared-making decision (SMD) process. Methods: A task force was constituted by 24 rheumatologists (panel members), with clinical and research expertise in immunizations and infectious diseases in immunocompromised patients, endorsed by the Brazilian Society of Rheumatology (BSR), to develop guidelines for COVID-19 vaccination in patients with IMRD. A consensus was built through the Delphi method and involved four rounds of anonymous voting, where five options were used to determine the level of agreement (LOA), based on the Likert Scale: (1) strongly disagree; (2) disagree, (3) neither agree nor disagree (neutral); (4) agree; and (5) strongly agree. Nineteen questions were addressed and discussed via teleconference to formulate the answers. In order to identify the relevant data on COVID-19 vaccines, a search with standardized descriptors and synonyms was performed on September 10th, 2021, of the MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials, ClinicalTrials.gov, and LILACS to identify studies of interest. We used the Newcastle–Ottawa Scale to assess the quality of nonrandomized studies. Results: All the nineteen questions-answers (Q&A) were approved by the BSR Task Force with more than 80% of panelists voting options 4—agree—and 5—strongly agree—, and a consensus was reached. These Guidelines were focused in SMD on the most appropriate timing for IMRD patients to get vaccinated to reach the adequate covid-19 vaccination response. Conclusion: These guidelines were developed by a BSR Task Force with a high LOA among panelists, based on the literature review of published studies and expert opinion for COVID-19 vaccination in IMRD patients. Noteworthy, in the pandemic period, up to the time of the review and the consensus process for this document, high-quality evidence was scarce. Thus, it is not a substitute for clinical judgment.
3.
Práticas de ressuscitação volêmica em unidades de terapia intensiva brasileiras: uma análise secundária do estudo Fluid-TRIPS
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Freitas, Flavio Geraldo Rezende de
; Hammond, Naomi
; Li, Yang
; Azevedo, Luciano Cesar Pontes de
; Cavalcanti, Alexandre Biasi
; Taniguchi, Leandro
; Gobatto, André
; Japiassú, André Miguel
; Bafi, Antonio Tonete
; Mazza, Bruno Franco
; Noritomi, Danilo Teixeira
; Dal-Pizzol, Felipe
; Bozza, Fernando
; Salluh, Jorge Ibrahin Figueira
; Westphal, Glauco Adrieno
; Soares, Márcio
; Assunção, Murillo Santucci César de
; Lisboa, Thiago
; Lobo, Suzana Margarete Ajeje
; Barbosa, Achilles Rohlfs
; Ventura, Adriana Fonseca
; Souza, Ailson Faria de
; Silva, Alexandre Francisco
; Toledo, Alexandre
; Reis, Aline
; Cembranel, Allan
; Rea Neto, Alvaro
; Gut, Ana Lúcia
; Justo, Ana Patricia Pierre
; Santos, Ana Paula
; Albuquerque, André Campos D. de
; Scazufka, André
; Rodrigues, Antonio Babo
; Fernandino, Bruno Bonaccorsi
; Silva, Bruno Goncalves
; Vidal, Bruno Sarno
; Pinheiro, Bruno Valle
; Pinto, Bruno Vilela Costa
; Feijo, Carlos Augusto Ramos
; Abreu Filho, Carlos de
; Bosso, Carlos Eduardo da Costa Nunes
; Moreira, Carlos Eduardo Nassif
; Ramos, Carlos Henrique Ferreira
; Tavares, Carmen
; Arantes, Cidamaiá
; Grion, Cintia
; Mendes, Ciro Leite
; Kmohan, Claudio
; Piras, Claudio
; Castro, Cristine Pilati Pileggi
; Lins, Cyntia
; Beraldo, Daniel
; Fontes, Daniel
; Boni, Daniela
; Castiglioni, Débora
; Paisani, Denise de Moraes
; Pedroso, Durval Ferreira Fonseca
; Mattos, Ederson Roberto
; Brito Sobrinho, Edgar de
; Troncoso, Edgar M. V.
; Rodrigues Filho, Edison Moraes
; Nogueira, Eduardo Enrico Ferrari
; Ferreira, Eduardo Leme
; Pacheco, Eduardo Souza
; Jodar, Euzebio
; Ferreira, Evandro L. A.
; Araujo, Fabiana Fernandes de
; Trevisol, Fabiana Schuelter
; Amorim, Fábio Ferreira
; Giannini, Fabio Poianas
; Santos, Fabrício Primitivo Matos
; Buarque, Fátima
; Lima, Felipe Gallego
; Costa, Fernando Antonio Alvares da
; Sad, Fernando Cesar dos Anjos
; Aranha, Fernando G.
; Ganem, Fernando
; Callil, Flavio
; Costa Filho, Francisco Flávio
; Dall´Arto, Frederico Toledo Campo
; Moreno, Geovani
; Friedman, Gilberto
; Moralez, Giulliana Martines
; Silva, Guilherme Abdalla da
; Costa, Guilherme
; Cavalcanti, Guilherme Silva
; Cavalcanti, Guilherme Silva
; Betônico, Gustavo Navarro
; Betônico, Gustavo Navarro
; Reis, Hélder
; Araujo, Helia Beatriz N.
; Hortiz Júnior, Helio Anjos
; Guimaraes, Helio Penna
; Urbano, Hugo
; Maia, Israel
; Santiago Filho, Ivan Lopes
; Farhat Júnior, Jamil
; Alvarez, Janu Rangel
; Passos, Joel Tavares
; Paranhos, Jorge Eduardo da Rocha
; Marques, José Aurelio
; Moreira Filho, José Gonçalves
; Andrade, Jose Neto
; Sobrinho, José Onofre de C
; Bezerra, Jose Terceiro de Paiva
; Alves, Juliana Apolônio
; Ferreira, Juliana
; Gomes, Jussara
; Sato, Karina Midori
; Gerent, Karine
; Teixeira, Kathia Margarida Costa
; Conde, Katia Aparecida Pessoa
; Martins, Laércia Ferreira
; Figueirêdo, Lanese
; Rezegue, Leila
; Tcherniacovsk, Leonardo
; Ferraz, Leone Oliveira
; Cavalcante, Liane
; Rabelo, Ligia
; Miilher, Lilian
; Garcia, Lisiane
; Tannous, Luana
; Hajjar, Ludhmila Abrahão
; Paciência, Luís Eduardo Miranda
; Cruz Neto, Luiz Monteiro da
; Bley, Macia Valeria
; Sousa, Marcelo Ferreira
; Puga, Marcelo Lourencini
; Romano, Marcelo Luz Pereira
; Nobrega, Marciano
; Arbex, Marcio
; Rodrigues, Márcio Leite
; Guerreiro, Márcio Osório
; Rocha, Marcone
; Alves, Maria Angela Pangoni
; Alves, Maria Angela Pangoni
; Rosa, Maria Doroti
; Dias, Mariza D’Agostino
; Martins, Miquéias
; Oliveira, Mirella de
; Moretti, Miriane Melo Silveira
; Matsui, Mirna
; Messender, Octavio
; Santarém, Orlando Luís de Andrade
; Silveira, Patricio Júnior Henrique da
; Vassallo, Paula Frizera
; Antoniazzi, Paulo
; Gottardo, Paulo César
; Correia, Paulo
; Ferreira, Paulo
; Torres, Paulo
; Silva, Pedro Gabrile M. de Barros e
; Foernges, Rafael
; Gomes, Rafael
; Moraes, Rafael
; Nonato filho, Raimundo
; Borba, Renato Luis
; Gomes, Renato V
; Cordioli, Ricardo
; Lima, Ricardo
; López, Ricardo Pérez
; Gargioni, Ricardo Rath de Oliveira
; Rosenblat, Richard
; Souza, Roberta Machado de
; Almeida, Roberto
; Narciso, Roberto Camargo
; Marco, Roberto
; waltrick, Roberto
; Biondi, Rodrigo
; Figueiredo, Rodrigo
; Dutra, Rodrigo Santana
; Batista, Roseane
; Felipe, Rouge
; Franco, Rubens Sergio da Silva
; Houly, Sandra
; Faria, Sara Socorro
; Pinto, Sergio Felix
; Luzzi, Sergio
; Sant’ana, Sergio
; Fernandes, Sergio Sonego
; Yamada, Sérgio
; Zajac, Sérgio
; Vaz, Sidiner Mesquita
; Bezerra, Silvia Aparecida Bezerra
; Farhat, Tatiana Bueno Tardivo
; Santos, Thiago Martins
; Smith, Tiago
; Silva, Ulysses V. A.
; Damasceno, Valnei Bento
; Nobre, Vandack
; Dantas, Vicente Cés de Souza
; Irineu, Vivian Menezes
; Bogado, Viviane
; Nedel, Wagner
; Campos Filho, Walther
; Dantas, Weidson
; Viana, William
; Oliveira Filho, Wilson de
; Delgadinho, Wilson Martins
; Finfer, Simon
; Machado, Flavia Ribeiro
.
Revista Brasileira de Terapia Intensiva
- Métricas do periódico
RESUMO Objetivo: Descrever as práticas de ressuscitação volêmica em unidades de terapia intensiva brasileiras e compará-las com as de outros países participantes do estudo Fluid-TRIPS. Métodos: Este foi um estudo observacional transversal, prospectivo e internacional, de uma amostra de conveniência de unidades de terapia intensiva de 27 países (inclusive o Brasil), com utilização da base de dados Fluid-TRIPS compilada em 2014. Descrevemos os padrões de ressuscitação volêmica utilizados no Brasil em comparação com os de outros países e identificamos os fatores associados com a escolha dos fluidos. Resultados: No dia do estudo, foram incluídos 3.214 pacientes do Brasil e 3.493 pacientes de outros países, dos quais, respectivamente, 16,1% e 26,8% (p < 0,001) receberam fluidos. A principal indicação para ressuscitação volêmica foi comprometimento da perfusão e/ou baixo débito cardíaco (Brasil 71,7% versus outros países 56,4%; p < 0,001). No Brasil, a percentagem de pacientes que receberam soluções cristaloides foi mais elevada (97,7% versus 76,8%; p < 0,001), e solução de cloreto de sódio a 0,9% foi o cristaloide mais comumente utilizado (62,5% versus 27,1%; p < 0,001). A análise multivariada sugeriu que os níveis de albumina se associaram com o uso tanto de cristaloides quanto de coloides, enquanto o tipo de prescritor dos fluidos se associou apenas com o uso de cristaloides. Conclusão: Nossos resultados sugerem que cristaloides são usados mais frequentemente do que coloides para ressuscitação no Brasil, e essa discrepância, em termos de frequências, é mais elevada do que em outros países. A solução de cloreto de sódio 0,9% foi o cristaloide mais frequentemente prescrito. Os níveis de albumina sérica e o tipo de prescritor de fluidos foram os fatores associados com a escolha de cristaloides ou coloides para a prescrição de fluidos.
Abstract Objective: To describe fluid resuscitation practices in Brazilian intensive care units and to compare them with those of other countries participating in the Fluid-TRIPS. Methods: This was a prospective, international, cross-sectional, observational study in a convenience sample of intensive care units in 27 countries (including Brazil) using the Fluid-TRIPS database compiled in 2014. We described the patterns of fluid resuscitation use in Brazil compared with those in other countries and identified the factors associated with fluid choice. Results: On the study day, 3,214 patients in Brazil and 3,493 patients in other countries were included, of whom 16.1% and 26.8% (p < 0.001) received fluids, respectively. The main indication for fluid resuscitation was impaired perfusion and/or low cardiac output (Brazil: 71.7% versus other countries: 56.4%, p < 0.001). In Brazil, the percentage of patients receiving crystalloid solutions was higher (97.7% versus 76.8%, p < 0.001), and 0.9% sodium chloride was the most commonly used crystalloid (62.5% versus 27.1%, p < 0.001). The multivariable analysis suggested that the albumin levels were associated with the use of both crystalloids and colloids, whereas the type of fluid prescriber was associated with crystalloid use only. Conclusion: Our results suggest that crystalloids are more frequently used than colloids for fluid resuscitation in Brazil, and this discrepancy in frequencies is higher than that in other countries. Sodium chloride (0.9%) was the crystalloid most commonly prescribed. Serum albumin levels and the type of fluid prescriber were the factors associated with the choice of crystalloids or colloids for fluid resuscitation.
https://doi.org/10.5935/0103-507x.20210028
273 downloads
4.
Internal and Marginal Fit and Fracture Strength of Narrow Diameter Dental Implant-Abutment Assembly
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Ruschel, George Hebert
; Bacchi, Ataís
; Moris, Izabela Cristina Maurício
; Poole, Stephanie Francoi
; Ribeiro, Ricardo Faria
; Gomes, Érica Alves
.
Resumo O objetivo deste estudo foi avaliar a adaptação marginal e interna de cópings metálicos em pilares sobre implantes, e a resistência a fratura de diferentes conjuntos de implantes/pilares de diâmetro reduzido, submetidos à ciclagem termomecânica ou não. Sessenta e quatro implantes/pilares (n=16) foram divididos em 04 grupos de acordo com o tipo de pilar e diâmetro do implante: G3.5-UAC (implante cone morse Ø3.5mm + munhão universal com término em chanfro); G2.9-UAS (implante cone morse Ø2.9mm + munhão universal com término em ombro); G2.8-AA (implante cone morse friccional Ø2.8mm + munhão anatômico); e G2.5-HP (implante de corpo único de Ø2.5mm com plataforma hexagonal indexada). Cada grupo foi dividio em dois subgrupos (n=8): submetidos ou não à ciclagem termomecânica (TMC). As amostras foram escaneadas por microtomografia (micro-CT) para avaliar a adaptação interna e marginal vertical dos copings metálicos. As amostras foram submetidas à resistência à compressão em uma maquina de ensaios universal. O grupo G3.5-UAC apresentou os maiores valores de desadaptação marginal independentemente da TMC (p<0,05). Todos os outros grupos foram similares entre si após TMC. O grupo G2.8-AA demonstrou o menor desajuste interno independentemente de TMC (p<0,05). O grupo G2.8-AA demonstrou a maior resistência à fratura, similar apenas ao grupo G2.5-HP sem TMC e G3.5-UAC com TMC. O tipo de pilar influencia a adaptação interna e marginal vertical de copings metálicos. O grupo do pilar anatômico (sem entalhes na superfície) levou à melhor adaptação, enquanto o grupo com plataforma expandida hexagonal e os grupos com munhão universal (com entalhes na superfície) proporcionaram os maiores desajustes (especialmente com termino em chanfro). Os implantes/pilares de diâmetro reduzido diferem em termos de resistencia à fratura, sendo que o conjunto mais resistente foi aquele composto por titânio tipo V e sem roscas internas (implante friccional).
Abstract The aim of this study was to assess the internal and vertical marginal fit of metallic copings to abutments and the fracture strength of different narrow diameter dental implant/abutments, either submitted to thermomechanical cycling or not. Sixty-four implant/abutments (n=16) were divided into 4 groups according to diameter and abutment type: G3.5-UAC (morse taper implant Ø3.5mm + universal abutment with beveled chamfer finish); G2.9-UAS (morse taper implant Ø2.9mm + universal abutment with shoulder finish); G2.8-AA (morse taper friction implant Ø2.8mm + anatomical abutment) and G2.5-HP (one-piece implant Ø2.5mm with indexed hexagonal platform). Each group was divided into two subgroups (n=8): submitted and not submitted to thermomechanical cycling (TMC). To assess internal and vertical marginal fit of metallic copings, the assemblies were scanned using microtomography (micro-CT) (n=5). The samples were subjected to the compressive strength test on a universal test machine. Group G3.5-UAC showed the highest marginal misfit regardless of TMC (p<0.05). All other groups were similar after TMC. Group G2.8-AA showed the lowest internal misfit both with and without TMC (p<0.05). Group G2.8-AA showed the highest fracture strength, similar only to G2.5-HP without TMC and G3.5-UAC with TMC. The type of abutment affects the internal and marginal fit of metallic copings and the anatomical abutment led to the best internal and marginal coping fit. The narrow diameter dental implant/abutments differ in terms of fracture strength, the strongest assembly was that composed by implant of type V grade titanium without internal threads (friction implant).
https://doi.org/10.1590/0103-6440202002937
1030 downloads
5.
Characteristics and outcomes of patients with COVID-19 admitted to the ICU in a university hospital in São Paulo, Brazil - study protocol
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Ferreira, Juliana C.
; Ho, Yeh-Li
; Besen, Bruno A.M.P.
; Malbuisson, Luiz M.S.
; Taniguchi, Leandro U.
; Mendes, Pedro V.
; Costa, Eduardo L.V.
; Park, Marcelo
; Daltro-Oliveira, Renato
; Roepke, Roberta M.L.
; Silva Jr, João M.
; Carmona, Maria José C.
; Carvalho, Carlos Roberto Ribeiro
; Hirota, Adriana
; Kanasiro, Alberto Kendy
; Crescenzi, Alessandra
; Fernandes, Amanda Coelho
; Miethke-Morais, Anna
; Bellintani, Arthur Petrillo
; Canasiro, Artur Ribeiro
; Carneiro, Bárbara Vieira
; Zanbon, Beatriz Keiko
; Batista, Bernardo Pinheiro De Senna Nogueira
; Nicolao, Bianca Ruiz
; Besen, Bruno Adler Maccagnan Pinheiro
; Biselli, Bruno
; Macedo, Bruno Rocha De
; Toledo, Caio Machado Gomes De
; Pompilio, Carlos Eduardo
; Carvalho, Carlos Roberto Ribeiro De
; Mol, Caroline Gomes
; Stipanich, Cassio
; Bueno, Caue Gasparotto
; Garzillo, Cibele
; Tanaka, Clarice
; Forte, Daniel Neves
; Joelsons, Daniel
; Robira, Daniele
; Costa, Eduardo Leite Vieira
; Silva Júnior, Elson Mendes Da
; Regalio, Fabiane Aliotti
; Segura, Gabriela Cardoso
; Marcelino, Gustavo Brasil
; Louro, Giulia Sefrin
; Ho, Yeh-Li
; Ferreira, Isabela Argollo
; Gois, Jeison de Oliveira
; Silva Junior, Joao Manoel Da
; Reusing Junior, Jose Otto
; Ribeiro, Julia Fray
; Ferreira, Juliana Carvalho
; Galleti, Karine Vusberg
; Silva, Katia Regina
; Isensee, Larissa Padrao
; Oliveira, Larissa dos Santos
; Taniguchi, Leandro Utino
; Letaif, Leila Suemi
; Lima, Lígia Trombetta
; Park, Lucas Yongsoo
; Chaves Netto, Lucas
; Nobrega, Luciana Cassimiro
; Haddad, Luciana
; Hajjar, Ludhmila
; Malbouisson, Luiz Marcelo
; Pandolfi, Manuela Cristina Adsuara
; Park, Marcelo
; Carmona, Maria José Carvalho
; Andrade, Maria Castilho Prandini H De
; Santos, Mariana Moreira
; Bateloche, Matheus Pereira
; Suiama, Mayra Akimi
; Oliveira, Mayron Faria de
; Sousa, Mayson Laercio
; Louvaes, Michelle
; Huemer, Natassja
; Mendes, Pedro
; Lins, Paulo Ricardo Gessolo
; Santos, Pedro Gaspar Dos
; Moreira, Pedro Ferreira Paiva
; Guazzelli, Renata Mello
; Reis, Renato Batista Dos
; Oliveira, Renato Daltro De
; Roepke, Roberta Muriel Longo
; Pedro, Rodolpho Augusto De Moura
; Kondo, Rodrigo
; Rached, Samia Zahi
; Fonseca, Sergio Roberto Silveira Da
; Borges, Thais Sousa
; Ferreira, Thalissa
; Cobello Junior, Vilson
; Sales, Vivian Vieira Tenório
; Ferreira, Willaby Serafim Cassa
.
OBJECTIVES: We designed a cohort study to describe characteristics and outcomes of patients with coronavirus disease (COVID-19) admitted to the intensive care unit (ICU) in the largest public hospital in Sao Paulo, Brazil, as Latin America becomes the epicenter of the pandemic. METHODS: This is the protocol for a study being conducted at an academic hospital in Brazil with 300 adult ICU beds dedicated to COVID-19 patients. We will include adult patients admitted to the ICU with suspected or confirmed COVID-19 during the study period. The main outcome is ICU survival at 28 days. Data will be collected prospectively and retrospectively by trained investigators from the hospital’s electronic medical records, using an electronic data capture tool. We will collect data on demographics, comorbidities, severity of disease, and laboratorial test results at admission. Information on the need for advanced life support and ventilator parameters will be collected during ICU stay. Patients will be followed up for 28 days in the ICU and 60 days in the hospital. We will plot Kaplan-Meier curves to estimate ICU and hospital survival and perform survival analysis using the Cox proportional hazards model to identify the main risk factors for mortality. ClinicalTrials.gov: NCT04378582. RESULTS: We expect to include a large sample of patients with COVID-19 admitted to the ICU and to be able to provide data on admission characteristics, use of advanced life support, ICU survival at 28 days, and hospital survival at 60 days. CONCLUSIONS: This study will provide epidemiological data about critically ill patients with COVID-19 in Brazil, which could inform health policy and resource allocation in low- and middle-income countries.
https://doi.org/10.6061/clinics/2020/e2294
1957 downloads
6.
Tensile Strength of Resin Cements Used with Base Metals in a Simulating Passive Cementation Technique for Implant-Supported Prostheses
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Falcão Filho, Hilmo Barreto Leite
; Ribeiro, Ricardo Faria
; Souza, Raphael Freitas de
; Macedo, Ana Paula
; Almeida, Rossana Pereira de
.
Resumo O objetivo deste estudo foi analisar a resistência à tração de dois diferentes cimentos resinosos usados na técnica de cimentação passiva de próteses implanto-suportadas. Noventa e seis cilindros plásticos foram encerados em formas padronizadas, fundidos em titânio grau 2 comercialmente puro e ligas de níquel-cromo e níquel-cromo-titânio. Amostras foram cimentadas sobre cilindros de titânio usando um cimento auto-adesivo ou um cimento convencional de dupla polimerização. Os espécimes foram divididos em 12 grupos (n=8) de acordo com o metal, cimento e processo de envelhecimento. Espécimes foram imersos em água destilada a 37 °C por 24 h e metade deles foi termociclado por 5,000 ciclos. Espécimes foram submetidos ao ensaio de tração numa máquina universal de ensaios (velocidade de 5 mm/min). Análise estatística evidenciou maior resistência à tração do cimento auto adesivo do que o cimento convencional de dupla polimerização, independente do metal utilizado. O cimento resinoso auto adesivo apresentou maior resistência à tração do que o cimento convencional de dupla polimerização. O tipo de metal e o processo de envelhecimento não tiveram influência nos resultados.
Abstract The aim of this study was to analyze the tensile strength of two different resin cements used in passive cementation technique for implant-supported prosthesis. Ninety-six plastic cylinders were waxed in standardized forms, cast in commercially pure titanium, nickel-chromium and nickel-chromium-titanium alloys. Specimens were cemented on titanium cylinders using self-adhesive resin cement or conventional dual-cured resin cement. Specimens were divided in 12 groups (n=8) in accordance to metal, cement and ageing process. Specimens were immersed in distilled water at 37 °C for 24 h and half of them was thermocycled for 5,000 cycles. Specimens were submitted to bond strength test in a universal test machine EMIC-DL2000 at 5 mm/min speed. Statistical analysis evidenced higher tensile strength for self-adhesive resin cement than conventional dual-cured resin cement, whatever the used metal. Self-adhesive resin cement presented higher tensile strength compared to conventional dual-cured resin cement. In conclusion, metal type and ageing process did not influence the tensile strength results.
https://doi.org/10.1590/0103-6440201600489
1413 downloads
7.
Fracture Strength of Weakened Anterior Teeth Associated to Different Reconstructive Techniques
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Ferro, Mariana Carolina de Lara
; Colucci, Vivian
; Marques, Artur Gaiotto
; Ribeiro, Ricardo Faria
; Silva-Sousa, Yara T. C.
; Gomes, Erica Alves
.
Resumo Este estudo avaliou a resistência à fratura de dentes tratados endodonticamente submetidos a diferentes técnicas de reconstrução por meio de testes dinâmico e estático. Quarenta dentes humanos anteriores foram divididos em 4 grupos (n=10): GNW (não fragilizado): raiz restaurada com pino de fibra de vidro (PFV), GW: raiz fragilizada restaurada com PFV, GDA: raiz fragilizada restaurada com PFV anatômico direto, e GIA: raiz fragilizada restaurada com PFV anatômico indireto. Os dentes foram tratados endodonticamente considerando que nos grupos experimentais (GW, GDA e GIA) simulou-se fragilização radicular das raízes para restauração com PFV utilizando diferentes técnicas. Os PFV foi cimentados com cimento resinoso e a porção coronária foi restaurada com resina composta e coroa metálica. Todas as amostras foram submetidas a simulação de mastigação em 60 ciclos/min totalizando 300,000 ciclos. As amostras sobreviventes foram submetidas a teste de compressão com velocidade de 1,0 mm/min em máquina universal de ensaio. A carga foi aplicada a 135° em relação ao longo eixo do dente até a falha do dente. Os dados foram analisados por ANOVA (a=0,05). Após a simulação da mastigação foi observado: GNW: 100% de sobrevivência das raízes; GW: 70% de sobrevivência das raízes, e GDA e GIA: 80% de sobrevivência das raízes. O valor médio de resistência à fratura (N) foi de 280,6 (GNW), 239,0 (GW), 221,3 (GDA) e 234,1 (GIA) sem diferença significante entre os grupos (p=0,7476). Os resultados sugerem similar resistência à fratura em ambos os dentes fragilizados ou não-fragilizados em relação à técnica de reconstrução das paredes radiculares internas. Elevada incidência de fraturas catastróficas foram observadas nos dentes fragilizados sem a restauração das paredes radiculares internas.
Abstract This study evaluated the fracture strength of endodontically treated teeth submitted to reconstructive techniques through dynamic and static tests. Forty human anterior teeth were divided into 4 groups (n=10): GNW (non-weakened) - root restored with glass fiber post (GFP), GW - weakened root restored with GFP, GDA - weakened root restored with direct anatomic GFP, and GIA - weakened root restored with indirect anatomic GFP. The teeth were endodontically treated considering that experimental groups (GW, GDA and GIA) simulated weakened roots for restoration with GFP using different techniques. The GFP was luted with resin cement and the coronal portion was restored with composite resin and metallic crowns. All samples were submitted to chewing simulation at 60 cycles/min in a total of 300,000 cycles. The survival samples were further exposed to compressive loading at a crosshead speed of 1.0 mm/min in a universal testing machine. The load was applied at 135° to the long axis of the tooth until failure. Data were analyzed by ANOVA (a=0.05). After chewing simulation were observed: GNW: 100% of survival roots; GW: 70% of survival roots, and GDA and GIA: 80% of survival roots. The mean fracture strength values (N) were 280.6 (GNW), 239.0 (GW), 221.3 (GDA), and 234.1 (GIA) without significant difference among the groups (p=0.7476). The results suggested similar fracture strength in both weakened and non-weakened teeth regardless the reconstructive technique of root internal wall. Higher incidence of catastrophic fracture was observed in weakened teeth without restoration of the root internal wall.
https://doi.org/10.1590/0103-6440201602452
3061 downloads
8.
Estudo da poluição pontual e difusa na bacia de contribuição do reservatório da usina hidrelétrica de Funil utilizando modelagem espacialmente distribuída em Sistema de Informação Geográfica
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Lima, Ricardo Neves de Souza
; Ribeiro, Celso Bandeira de Melo
; Barbosa, Cláudio Clemente Faria
; Rotunno Filho, Otto Corrêa
.
RESUMO Este estudo avaliou o potencial poluidor da bacia de contribuição do reservatório de Funil (BCRF), localizado na bacia hidrográfica do rio Paraíba do Sul, considerando a geração da carga de nutrientes, nitrogênio (N) e fósforo (P), por fontes pontuais e difusas, a partir de uma modelagem distribuída utilizando Sistema de Informação Geográfica (SIG). As cargas e concentrações médias anuais desses nutrientes foram geradas a partir do acoplamento de equações empíricas, em SIG, considerando informações espaciais de uso e cobertura do solo, população residente na bacia e vazão média anual de longo período, obtida por equações do tipo chuva vazão. Os resultados indicaram que 80% da carga total de nitrogênio foram provenientes de fontes pontuais e 20% de fontes difusas, enquanto que, da carga total de fósforo, 89,1% foram originadas de fontes pontuais e 10,9% de fontes difusas. As concentrações de nutrientes estimadas pelo modelo empírico apresentaram bons ajustes em relação aos valores observados de fósforo e de nitrogênio no rio Paraíba do Sul, com R²=0,96 (p<0,01) e R²=0,70 (p<0,01), respectivamente. Dessa forma, o modelo foi capaz de detectar, de forma significativa, a tendência das variações nas concentrações de nutrientes ao longo de diferentes trechos da BCRF.
ABSTRACT This study evaluated the potential polluter of the Funil Reservoir Contribution Basin (BCRF), located in the Paraíba do Sul River basin, considering the generation of nutrient loading, nitrogen (N) and phosphorus (P), due to point and diffuse sources from a distributed modeling using Geographic Information System (GIS). Loads and annual average concentrations of these nutrients were generated from the coupling of empirical equations, in GIS, considering spatial information such as land use/cover, population living in the basin and long period average annual flow obtained by equations of rainfall runoff. The results indicated that 80% of the total load of nitrogen was generated from point sources and 20% from diffuse sources, while 89.1% were originated from point sources and 10.9% from diffuse sources for the corresponding total load of phosphorus. The model estimated adequately the concentration when compared to the observed values and it was able to detect the trend of changes in nutrient concentrations along different sections of the BCRF highlighting significant correlations between the observed and simulated concentrations of phosphorus and nitrogen with R²=0.96 (p<0.01) and R²=0.70 (p<0.01), respectively.
https://doi.org/10.1590/S1413-41520201600100127676
9917 downloads
9.
Reliability of FEA on the Results of Mechanical Properties of Materials
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Gomes, Erica Alves
; Diana, Hugo Henrique
; Oliveira, Juliana Santos
; Silva-Sousa, Yara Teresinha Corrêa
; Faria, Adriana Cláudia Lapria
; Ribeiro, Ricardo Faria
.
Resumo O presente estudo avaliou a confiabilidade do MEF nos resultados de diferentes propriedades mecânicas (E e v) dos materiais. Dois modelos 3D de um canino superior com tratamento endodôntico, pino intrarradicular, núcleo em resina composta e restaurado com coroa metalocerâmica foram gerados de acordo com imagens de micro-CT. Dois grupos com diferentes valores de E e v para a cerâmica, coping metálico, cimento resinoso e resina composta foram criados. As propriedades dos materiais para o grupo GL foram baseadas em dados obtidos da literatura, enquanto para o grupo GIE a técnica de excitação por impulso foi utilizada. Carga de 180 N foi aplicada a 45° na superfície lingual do terço incisal do canino. Todos os modelos foram suportados pelo ligamento periodontal (x=y=z=0). Tensões equivalentes de von Mises (VMS) foram calculadas. Os valores de tensões revelaram diferença entre os grupos, ambos para a distribuição e valor das VMS. A cerâmica (GL: 5,966 MPa; GIE: 7,478 MPa), coping metálico (GL: 3,811 MPa; GIE: 0,973 MPa) e núcleo (GL: 4,771 MPa; GIE: 0,026 MPa) foram significativamente afetados. Em conclusão, este estudo mostrou que a determinação das propriedades mecânicas (E and v) dos materiais é essencial para a confiabilidade dos resultados do MEF.
The present study evaluated the reliability of FEA on the results of different mechanical properties (E and v) of materials. Two 3D models of a maxillary canine with endodontic treatment, intracanal post, composite resin core and restored with porcelain-fused-to-metal crown were generated according to micro-CT images. Two groups with different E and ν values for porcelain, metal coping alloy, resin cement and composite resin were established. The materials' properties for group GL were based on literature data, while for group GIE the impulse excitation technique was used. A load of 180 N was applied at 45° on the incisal third of the lingual surface of the canine tooth. All models were supported by the periodontal ligament (x=y=z=0). The von Mises stress (VMS) was calculated. The stress values revealed differences between the groups for both VMS distribution and value. The porcelain (GL: 5.966 MPa; GIE: 7.478 MPa), metal coping (GL: 3.811 MPa; GIE: 0.973 MPa) and core (GL: 4.771 MPa; GIE: 0.026 MPa) were significantly affected. In conclusion, this study showed that the determination of mechanical properties (E and ν) of materials is essential for the reliability on the results of FEA.
https://doi.org/10.1590/0103-6440201300639
8241 downloads
10.
In Vitro Fit and Cementation Resistance of Provisional Crowns for Single Implant-Supported Restorations
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Moris, Izabela Cristina Maurício
; Oliveira, Juliana Elias de
; Faria, Adriana Cláudia Lapria
; Ribeiro, Ricardo Faria
; Rodrigues, Renata Cristina Silveira
.
Resumo: O objetivo deste estudo foi avaliar a adaptação marginal e o efeito da espessura da camada de cimento na retenção de coroas provisórias fixadas sobre os pilares com o auxílio de cilindros acrílicos pré-fabricados, utilizando dois cimentos provisórios submetidos ou não à ciclagem mecânica. Coroas provisórias foram confeccionadas com resina bis-acrilíca (Luxatemp Flourescence) ou resina à base de metil metacrilato (Duralay) sobre os cilindros, para posterior avaliação da influência das diferentes resinas na adaptação marginal e na espessura da linha do cimento. Para a avaliação da resistência à tração, as coroas foram cimentadas com dois cimentos provisórios: à base de óxido de zinco sem eugenol (Temp Bond NE) ou hidróxido de cálcio (Hydcal) e submetidas ao teste de tração em máquina universal de ensaio. Após o ensaio, as coroas foram limpas e novamente cimentadas para serem submetidas à ciclagem mecânica e posterior avaliação da resistência à tração. Os resultados obtidos para adaptação marginal e espessura do cimento foram analisados pelo teste t de Student, enquanto os resultados de resistência à cimentação antes e após a ciclagem mecânica foram analisados pelo modelo linear de efeitos mistos. As coroas confeccionadas com a resina de metil metacrilato apresentaram maiores valores para desadaptação marginal (p=0,001) e espessura do cimento (p=0,003) na parede oclusal quando comparadas com as coroas de resina bis-acrílica. Não houve diferença na espessura do cimento (p=0,606) na parede axial das coroas provisórias. As diferentes resinas não afetaram a resistência à cimentação das coroas (p=0,281), mas os diferentes cimentos (p=0,029) e a ciclagem mecânica (p=0,027) mostraram efeitos significantes. A única interação significante foi ciclagem mecânica ?#61482; agente cimentante, o que significa que os cimentos foram diferentemente afetados pela ciclagem mecânica (p=0,002). Em conclusão, a associação resina bis-acrílíca e cimento de hidróxido de cálcio proporcionou melhor resistência à tração e menor espessura de cimento.
Abstract: This study aimed to verify marginal fit and the effect of cement film thickness standardization on retention of provisional crowns made with prefabricated acrylic cylinders on abutments, using two temporary luting agents subjected or not to mechanical cycling. Provisional crowns were made from bis-acryl (Luxatemp Fluorescence) or methyl methacrylate (Duralay) resins on acrylic cylinders and marginal fit and cement film thickness were evaluated. For retention evaluation, crowns were cemented with two temporary luting agents: non-eugenol zinc oxide (Tempbond NE) or calcium hydroxide-based (Hydcal) cements and subjected to tensile strength in a universal testing machine. After cleaning, debonded crowns were cemented again, subjected to mechanical cycling and retention was reassessed. The results of marginal fit and cement film thickness were analyzed by Student's t-test while retention of cements before and after mechanical cycling was analyzed using a mixed linear model. Methyl methacrylate crowns presented greater marginal misfit (p=0.001) and occlusal cement film thickness (p=0.003) than the bis-acryl ones. No difference was observed at axial cement film thickness (p=0.606). Resins (p=0.281) did not affect crown retention, but luting agents (p=0.029) and mechanical cycling (p=0.027) showed significant effects. The only significant interaction was mechanical cycling*luting agents, which means that luting agents were differently affected by mechanical cycling (p=0.002). In conclusion, the results showed that bis-acryl resin associated to calcium-hydroxide luting agent provided the best retention and lower cement thickness.
https://doi.org/10.1590/0103-6440201300289
2460 downloads
11.
Effective perinatal intensive care in europe (epice): Descrição do Projeto e primeiros resultados em Portugal
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Barros, Henrique
; Rodrigues, Carina
; Costa, Raquel
; Baía, Inês
; Rodrigues, Teresa
; Machado, Maria do Céu
; Graça, Luís
; Carrapato, Rui
; Couto, Adelina Sá
; Lopes, Aldina
; Almeida, Alexandra
; Portela, Alexandrina
; Vilas Boas, Alice
; Pereira, Almerinda
; Aroso, Ana
; Berdeja, Ana
; Bettencourt, Ana
; Campos, Ana
; Santos, Ana Castilho
; Machado, Ana Isabel
; Andrade, Ana Maria
; Bento, Ana Melo
; Neto, Ana
; Pita, Ana
; Ferreira, Ana Rute
; Tavares, Angelina
; Costa, Anselmo
; Nazaré, Antónia
; Braga, António
; Fonseca, António
; Lanhoso, António
; Vilarinho, António
; Gomes, Ariana
; Sousa, Beatriz
; Marinho, Carla
; Sá, Carla
; Moniz, Carlos
; Carvalho, Cármen
; Dâmaso, Catarina
; Araújo, Célia
; Dias, Clara Paz
; Araújo, Cláudia
; Casanova, Conceição
; Cunha, Conceição
; Murinello, Conceição Faria
; Telhado, Conceição
; Didelet, Cristina
; Leite, Cristina
; Martins, Cristina
; Trindade, Cristina
; Almeida, Daniela
; Pena, Domingos Jardim da
; Oliveira, Dulce
; Reis, Eduarda
; Fernandes, Eduardo
; Casal, Ester
; Gaspar, Eurico
; Fonseca, Fátima
; Romão, Fátima
; Matos, Fernanda
; Cirurgião, Fernando
; Nunes, Filomena
; Pereira, Gabriela
; Carvalhosa, Glória
; Henriques, Graça
; Rodrigues, Gustavo
; Almeida, Helena
; Oliveira, Helena
; Sousa, Helena
; Guimarães, Hercília
; Quelhas, Ilídio
; Canelas, Isabel
; Silva, Isabel Carolino
; Knoch, Isabel
; Martins, Isabel
; Torres, Jacinto
; Saldanha, Joana
; Sampaio, Joana
; Mendes, João
; Marinho, Joaquim
; Baltazar, Joaquina
; Ribeiro, Jorge
; Silva, Jorge
; Amorim, José
; Furtado, José
; Guimarães, José
; Fonseca, José Luís
; Nogueira, José Miguel
; Oliveira, José
; Pombeiro, José
; Teixeira, José
; Calviño, Juan
; Marques, Judite
; Araújo, Lucília
; Caturra, Luís
; Serra, Mª do Carmo
; Arteaga, Mª Paula
; Cabral, Margarida
; Pontes, Margarida
; Seabra, Margarida
; Pinho, Maria Lurdes
; Carneiro, Mª José
; Furtado, Mário
; Paiva, Mário
; Cabanas, Marisa
; Aguiar, Marta
; Barbosa, Marta
; Serelha, Micaela
; Montenegro, Nuno
; Carmo, Olímpia do
; Vaz, Óscar
; Soares, Osvaldo
; Costa, Paula
; Pinheiro, Paula
; Soares, Paula
; Enes, Pedro
; Rocha, Pedro
; Silva, Pedro
; Tiago, Pedro
; Maciel, Raquel
; Mira, Ricardo
; Rodrigues, Rosa
; Barroso, Rosalina
; Rodrigues, Rosalinda
; Mendonça, Rubina
; Costa, Rui
; Pinto, Rui
; Prado, Sara Noéme
; Sousa, Susana Gama de
; Oliveira, Teresa
; Teles, Teresa
; Tomé, Teresa
; Ventura, Teresa
; Martins, Valdemar
; Neves, Vítor
; Nunes, Zélia
; Zeitlin, Jennifer
.
A melhoria da qualidade dos cuidados pré-natais e dos cuidados intensivos neonatais resultaram, nas últimas décadas, numa continuada diminuição da morbilidade e da mortalidade perinatais e infantis, particularmente de recém-nascidos muito pré-termo. No entanto, há uma grande variabilidade entre unidades de saúde na decisão sobre procedimentos e intervenções, quer a nível nacional quer internacional, que se pode refletir em desigualdades nos resultados em saúde e que importa identificar e compreender. Este artigo tem como objetivos descrever: (1) o projeto europeu “Effective Perinatal Intensive Care in Europe” (EPICE); (2) o estudo piloto desenvolvido na Região Norte de Portugal para testar o protocolo e o instrumento de recolha de dados do estudo de coorte; (3) o recrutamento e amostra final da coorte EPICE-Portugal. O projeto EPICE desenvolve-se em 19 regiões de 11 Estados Membros da União Europeia e tem como objetivo investigar como o conhecimento científico é efetivamente aplicado no acompanhamento de recém-nascidos muito pré-termo, usando metodologias quantitativas e qualitativas. Em Portugal, o estudo integra todas as unidades públicas de obstetrícia e neonatologia da região Norte e de Lisboa e Vale do Tejo (LVT), bem como três unidades privadas de LVT. Os procedimentos do estudo (recrutamento e questionários) foram testados em quatro unidades hospitalares da região Norte de Portugal, através da recolha de informação do processo clínico de 21 nados-vivos, entre maio e dezembro de 2010, sobre a gravidez e os cuidados pré-natais, o parto, os cuidados neonatais e a alta hospitalar, usando um formulário estruturado. O estudo piloto permitiu testar o instrumento de recolha de dados e verificar que, em geral, a informação registada nos processos era suficiente para assegurar a implementação do projeto EPICE em Portugal. O recrutamento da coorte EPICE-Portugal decorreu entre 1 de junho de 2011 e 31 de maio de 2012, tendo sido identificados 724 nados-vivos muito pré-termo, bem como 95 interrupções médicas da gravidez e 155 mortes fetais com idade gestacional entre as 22+0 e as 31+6 semanas de gestação. Dos 724 nados-vivos, 607 tiveram alta hospitalar, tendo sido obtidos 544 (89,6%) consentimentos para as avaliações de seguimento.
In the last decades, the improvement of antenatal and neonatal care led to a continued decrease in perinatal and infant morbidity and mortality, particularly for very preterm infants. However, there is a great variability in medical procedures and interventions across health units, both at national and international levels, which can result in avoidable inequalities in health outcomes. This study intends to describe (1) the European project “Effective Perinatal Intensive Care in Europe” (EPICE), designed to identify and understand such variation; (2) the pilot study conducted in the Northern Region of Portugal to test the protocol and the questionnaire for data collection and (3) the recruitment and final sample of the EPICE-Portugal cohort. The EPICE project includes 19 regions from 11 EU Member states and aims to explore how scientific knowledge is effectively applied to monitor very preterm infants, using both quantitative and qualitative methodologies. In Portugal, this study involves all the public maternity and neonatal intensive care units from Northern and Lisbon and Tagus Valley (LVT) regions, along with 3 private units from LVT. The study procedures (recruitment and questionnaires) were tested in 4 hospitals in the Northern region of Portugal, by collecting information from the clinical records of 21 live births, born between May and December 2010. Data on pregnancy and prenatal care, childbirth, neonatal care and discharge was collected using a structured questionnaire. The pilot study tested data collection instruments and showed that, in general, the information documented in clinical records was enough to answer the questionnaire items, guaranteeing the feasibility of the EPICE project in Portugal. The EPICE-Portugal recruitment occurred between 1st june 2011 and 31st May 2012, identifying 724 very preterm live-births, as well as 95 terminations of pregnancy and 155 fetal deaths, from 22+0 to 31+6 weeks of gestation. The 724 live births resulted in 607 babies discharge alive, and written informed consent for the follow-up evaluations was obtained for 544 (89.6%) infants.
2312 downloads
12.
Malaria in Brazil: what happens outside the Amazonian endemic region
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Pina-Costa, Anielle de
; Brasil, Patrícia
; Santi, Sílvia Maria Di
; Araujo, Mariana Pereira de
; Suárez-Mutis, Martha Cecilia
; Santelli, Ana Carolina Faria e Silva
; Oliveira-Ferreira, Joseli
; Lourenço-de-Oliveira, Ricardo
; Daniel-Ribeiro, Cláudio Tadeu
.
Memórias do Instituto Oswaldo Cruz
- Métricas do periódico
Brazil, a country of continental proportions, presents three profiles of malaria transmission. The first and most important numerically, occurs inside the Amazon. The Amazon accounts for approximately 60% of the nation’s territory and approximately 13% of the Brazilian population. This region hosts 99.5% of the nation’s malaria cases, which are predominantly caused by Plasmodium vivax (i.e., 82% of cases in 2013). The second involves imported malaria, which corresponds to malaria cases acquired outside the region where the individuals live or the diagnosis was made. These cases are imported from endemic regions of Brazil (i.e., the Amazon) or from other countries in South and Central America, Africa and Asia. Imported malaria comprised 89% of the cases found outside the area of active transmission in Brazil in 2013. These cases highlight an important question with respect to both therapeutic and epidemiological issues because patients, especially those with falciparum malaria, arriving in a region where the health professionals may not have experience with the clinical manifestations of malaria and its diagnosis could suffer dramatic consequences associated with a potential delay in treatment. Additionally, because the Anopheles vectors exist in most of the country, even a single case of malaria, if not diagnosed and treated immediately, may result in introduced cases, causing outbreaks and even introducing or reintroducing the disease to a non-endemic, receptive region. Cases introduced outside the Amazon usually occur in areas in which malaria was formerly endemic and are transmitted by competent vectors belonging to the subgenus Nyssorhynchus (i.e., Anopheles darlingi, Anopheles aquasalis and species of the Albitarsis complex). The third type of transmission accounts for only 0.05% of all cases and is caused by autochthonous malaria in the Atlantic Forest, located primarily along the southeastern Atlantic Coast. They are caused by parasites that seem to be (or to be very close to) P. vivax and, in a less extent, by Plasmodium malariae and it is transmitted by the bromeliad mosquito Anopheles (Kerteszia) cruzii. This paper deals mainly with the two profiles of malaria found outside the Amazon: the imported and ensuing introduced cases and the autochthonous cases. We also provide an update regarding the situation in Brazil and the Brazilian endemic Amazon.
13.
Importance of a distal proximal contact on load transfer by implant-supported single adjacent crowns in posterior region of the mandible: a photoelastic study
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Aguiar Junior, Fabio Afranio de
; Tiossi, Rodrigo
; Macedo, Ana Paula
; Mattos, Maria da Gloria Chiarello de
; Ribeiro, Ricardo Faria
; Rodrigues, Renata Cristina Silveira
.
OBJECTIVE: This study aimed to evaluate the importance of a distal proximal contact on the load transfer to the posterior region of the mandible by non-splinted adjacent implant-supported crowns using photoelastic stress analysis. MATERIAL AND METHODS: A rectangular model (68x30x15 mm) was made of polymethylmethacrylate resin to simulate half of the mandibular arch. One model was completed with resin replicas representing the first premolar and second molar and with two 3.75 mm dia.x11 mm internal hexagon threaded implants replacing the second premolar and first molar. The other model was manufactured in the same way but without the second molar. Both models were duplicated using photoelastic resin. The roots of the teeth replicas were covered with a layer of polyether impression material to simulate the periodontal ligament. Two different vertical loads were applied to the crowns as follows: 1 - single static point load alternately applied to the crowns replacing the second premolar and first molar (50 N); 2 - simultaneous static point loads applied to both of the crowns replacing the second premolar and first molar (100 N). The resulting isochromatic fringe pattern in the photoelastic model was monitored and photographed. RESULTS: All loading conditions studied showed that the presence of the second molar has changed the load transmission and the pattern of stresses. CONCLUSION: Results showed that the presence of a second molar proximal contact can help minimize the stresses around the implants.
https://doi.org/10.1590/1679-775720130049
3095 downloads
14.
Effect of whitening toothpaste on titanium and titanium alloy surfaces
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Faria, Adriana Cláudia Lapria
; Bordin, Angelo Rafael de Vito
; Pedrazzi, Vinícius
; Rodrigues, Renata Cristina Silveira
; Ribeiro, Ricardo Faria
.
Dental implants have increased the use of titanium and titanium alloys in prosthetic applications. Whitening toothpastes with peroxides are available for patients with high aesthetic requirements, but the effect of whitening toothpastes on titanium surfaces is not yet known, although titanium is prone to fluoride ion attack. Thus, the aim of the present study was to compare Ti-5Ta alloy to cp Ti after toothbrushing with whitening and conventional toothpastes. Ti-5Ta (%wt) alloy was melted in an arc melting furnace and compared with cp Ti. Disks and toothbrush heads were embedded in PVC rings to be mounted onto a toothbrushing test apparatus. A total of 260,000 cycles were carried out at 250 cycles/minute under a load of 5 N on samples immersed in toothpaste slurries. Surface roughness and Vickers microhardness were evaluated before and after toothbrushing. One sample of each material/toothpaste was analyzed by Scanning Electron Microscopy (SEM) and compared with a sample that had not been submitted to toothbrushing. Surface roughness increased significantly after toothbrushing, but no differences were noted after toothbrushing with different toothpastes. Toothbrushing did not significantly affect sample microhardness. The results suggest that toothpastes that contain and those that do not contain peroxides in their composition have different effects on cp Ti and Ti-5Ta surfaces. Although no significant difference was noted in the microhardness and roughness of the surfaces brushed with different toothpastes, both toothpastes increased roughness after toothbrushing.
3310 downloads
15.
Effect of fluoride sodium mouthwash solutions on cpTI: evaluation of physicochemical properties
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Toniollo, Marcelo Bighetti
; Galo, Rodrigo
; Macedo, Ana Paula
; Rodrigues, Renata Cristina Silveira
; Ribeiro, Ricardo Faria
; Mattos, Maria da Gloria Chiarello de
.
Os efeitos do fluoreto, o qual está presente em diferentes produtos de higiene oral, necessita de maiores investigações, pois pouco se sabe sobre seus efeitos na superfície do titânio, o qual possui amplo uso na implantodontia. Este estudo objetivou avaliar a superfície do titânio comercialmente puro (cpTi) após exposição a diferentes concentrações de fluoreto de sódio (NaF). A hipótese testada neste estudo foi que diferentes concentrações de NaF aplicadas em diferentes intervalos de tempo seriam capazes de afetar diferentemente a superfície do titânio. Os tratamentos realizados foram: GA (controle): imersão em água destilada; GB: imersão diária por 3 min em NaF a 0,05%; GC: imersão diária por 3 min em NaF a 0,2%; GD: imersão quinzenal por 3 min em NaF a 0,05%; e GE: imersão quinzenal por 3 min em NaF a 0,2%. O tempo do experimento foi de 60 dias. A análise da rugosidade foi efetuada inicialmente e a cada 15 dias. Após 60 dias foi realizada análise de corrosão e polarização anódica. As amostras foram analisadas em MEV. Os dados de rugosidade foram analisados por ANOVA e não houve diferença estatisticamente significante entre grupos e entre tempos. Os dados de corrosão (i corr) foram analisados pelo teste de Mann-Whitney e foram encontradas diferenças significantes entre GA e GC, GC e GB, GC e GD, GC e GE. A MEV evidenciou que a superfície do titânio exposto ao NaF apresentou corrosão variando de acordo com a concentração. Com base nos dados encontrados conclui-se que o uso de solução NaF a 0,05% em cpTi é seguro, enquanto a solução NaF 0,2% para uso diário deve ser cuidadosamente avaliada.
The effects of fluoride, which is present in different oral hygiene products, deserve more investigation because little is known about their impact on the surface of titanium, which is largely used in Implantology. This study evaluated the surface of commercially pure titanium (cpTi) after exposure to different concentrations of sodium fluoride (NaF). The hypothesis tested in this study was that different concentrations of NaF applied at different time intervals can affect the titanium surface in different ways. The treatments resulted in the following groups: GA (control): immersion in distilled water; GB: immersion in 0.05% NaF for 3 min daily; GC: immersion in 0.2% NaF for 3 min daily; GD: immersion in 0.05% NaF for 3 min every 2 weeks; and GE: immersion in 0.2% NaF for 3 min every 2 weeks. The experiment lasted 60 days. Roughness was measured initially and every 15 days subsequently up to 60 days. After 60 days, corrosion analysis and anodic polarization were done. The samples were examined by scanning electron microscopy (SEM). The roughness data were analyzed by ANOVA and there was no significant difference among groups and among time intervals. The corrosion data (i corr) were analyzed by the Mann-Whitney test, and significant differences were found between GA and GC, GB and GC, GC and GD, GC and GE. SEM micrographs showed that the titanium surface exposed to NaF presented corrosion that varied with the different concentrations. This study suggests that the use of 0.05% NaF solution on cpTi is safe, whereas the 0.2% NaF solution should be carefully evaluated with regard to its daily use.
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