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Search Results: 1 - 10 of 370424 matches for " Patrícia Rodrigues de Almeida Silva e; "
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Evaluation of apical deviation in root canals instrumented with K3 and ProTaper systems
Santos, Mariana Diniz Bisi dos;Marceliano, Marília Fagury;Souza, Patrícia Rodrigues de Almeida Silva e;
Journal of Applied Oral Science , 2006, DOI: 10.1590/S1678-77572006000600013
Abstract: objectives: this study evaluated the apical deviation of curved root canals instrumented with k3 and protaper systems. material and methods: twenty root canals of human maxillary and mandibular first molars were employed, which were divided into 2 groups: group a (10 teeth) was instrumented with the k3 system, and group b (10 teeth) with the protaper system. evaluation of deviation was performed by double radiographic exposure. radiographs were achieved before and after instrumentation, with 0.3-second, thus allowing superimposition of images. three-dimensional computerized tomograph was performed in 3 specimens in each group, as an additional means to evaluate the apical deviation. results: were evaluated by the parametric test student-newman-keuls at 5%, which did not reveal significance between groups concerning the apical deviation. the results of computerized tomograph images demonstrated that the larger deviation of the root canal occurred at the distolingual area for both systems. conclusions: both techniques produced a mild apical deviation. computerized microtomography was shown to be accurate for experimental endodontics studies.
Wear of K3 and ProTaper files after simulated clinical use in curved canals
Marília Fagury Videira Marceliano-Alves,Mariana Diniz Bisi dos Santos,Patrícia de Almeida Rodrigues Silva e Souza
RGO : Revista Gaúcha de Odontologia , 2009,
Abstract: Objective: To assess wear, after simulated clinical use of K3 (SybronEndo, Orange, CA, EUA) and ProTaper files (Dentsply-Maillefer, Tulsa, Oklahoma, EUA) in 46 mesiovestibular roots of human maxillary first molars, recently extracted and with mean angulation of 40°.Methods: The teeth were divided as follows: a) K3 (SybronEndo, Orange, CA, EUA) (with radial bands) and b) ProTaper (Dentsply-Maillefer, Tulsa, Oklahoma, EUA) (without radial bands). The files were assessed by scanning electronic microscopy before first use to visualize fabrication defects, and after 7 and 13 cycles of debridement in the canals. Debridement with files K3 (SybronEndo, Orange, CA, EUA) and ProTaper (Dentsply-Maillefer, Tulsa, Oklahoma, EUA) was performed in accordance with the manufacturers’ recommendations. The criteria for wear assessment were: defects (stretching, shortening/spiral inversion, presence of craters), oblique cracks and fracture. After assessment by SEM and before they were used, metal barbs on the crest of the spirals and oblique scratches due to the machining process were found in all the files.Results: In the K3 system (SybronEndo, Orange, CA, USA), after being used seven times, all the instruments showed cutting angle defects,and 25/08 and 25/10 had oblique cracks in the body of the active part leading to ductile fracture after being used for the eighth time. In the ProTaper system (Dentsply-Maillefer, Tulsa, Oklahoma, USA), after being used seven times, in addition to cutting angle defects, the files also presented cracks, and ruptile fracture occurred in F3 during use for the thirteenth time. At the end of preparation, craters were seen along the active part of the files.Conclusion: In the final analysis, it was seen that the system are equivalent with regard to the defects found, irrespective of the active part design,being proportional to the number of cycles of use, and these defects could act as points of greater fragility, favoring fracture.
Adhesive systems: important aspects related to their composition and clinical use
Silva e Souza Junior, Mario Honorato;Carneiro, Karina Gama Kato;Lobato, Marcelo Figueiredo;Silva e Souza, Patrícia de Almeida Rodrigues;Góes, Mário Fernando de;
Journal of Applied Oral Science , 2010, DOI: 10.1590/S1678-77572010000300002
Abstract: this literature review article addresses the types and the main components of different etch-and-rinse and self-etch adhesive systems available in the market, and relates them to their function, possible chemical interactions and infuence of handling characteristics. scanning electron microscopy (sem) images are presented to characterize the interface between adhesives and dentin. adhesive systems have been recently classifed according to their adhesion approaches in etch-and-rinse, self-etch and glass ionomer. the etch-and-rinse systems require a specifc acid-etch procedure and may be performed in two or three steps. self-etch systems employ acidic monomers that demineralize and impregnate dental substrates almost at the same time. these systems are separated in one or two steps. some advantages and defciencies were noted for etch-and-rinse and self-etch approaches, mainly for the simplifed ones due to some chemical associations and interactions. the sem micrographs illustrate different relationships between adhesive systems and dental structures, particularly dentin. the knowledge of composition, characteristics and mechanisms of adhesion of each adhesive system is of fundamental importance to permit the adoption of ideal bonding strategies under clinical conditions.
A New Weak Chelator in Endodontics: Effects of Different Irrigation Regimens with Etidronate on Root Dentin Microhardness
Talita Tartari,Patrícia de Almeida Rodrigues Silva e Souza,Bruno Vila Nova de Almeida,José Otávio Carrera Silva Júnior,Oscar Facíola Pessoa,Mario Honorato Silva e Souza Junior
International Journal of Dentistry , 2013, DOI: 10.1155/2013/743018
Abstract: This study investigated the effect of sodium hypochlorite (NaOCl), ethylenediaminetetraacetic (EDTA), etidronic (HEBP), and citric acid (CA) associated in different irrigation regimens on root dentin microhardness. Forty-five root halves of single-rooted teeth were sectioned into thirds that were embedded in acrylic resin, polished, randomly assigned into 3 groups, and treated as follows: G1: saline solution; G2: 5% NaOCl + 18% HEBP, mixed in equal parts; and G3: 2.5% NaOCl. After measurements, the G3 samples were distributed into subgroups G4, G5, and G6, which were submitted to 17% EDTA, 10% CA and 9% HEBP, respectively. Following the new measurements, these groups received a final flush with 2.5% NaOCl, producing G7, G8, and G9. Microhardness was measured with Knoop indenter under a 25?g load for 15 seconds, before and after treatments. The data were statistically analyzed using paired Student’s t-test ( ) to compare values before and after treatments and analysis of variance (ANOVA) ( ) to detect any differences among thirds. Except G1, all tested irrigation regimens significantly decreased the microhardness. There were no differences between root thirds before treatments, and all root thirds exhibited equal responses to same treatment. Except saline, all tested irrigation regimens reduced the root dentin microhardness. 1. Introduction During endodontic therapy, chemical solutions are used to assist the action of endodontic instruments in the process of cleaning and shaping the root canal system. The lubrication of dentinal walls by these solutions would lower mechanical stress on rotary root canal instruments preventing instrument separation [1]. Despite the fact that these solutions facilitate the root canal instrumentation, they can also increase the possibility of occurrence of root canal deviation during biomechanical preparation [2], because they interfere in chemical structure of dentin, modifying the calcium/phosphorus (Ca/P) ratio of the surface [3, 4], which may decrease microhardness [5] facilitating the dentin cutting. These changes can also affect the sealing ability and adhesion of root canal sealers [6, 7]. Studies indicated that sodium hypochlorite (NaOCl), the most commonly used irrigating agent, decreases the microhardness of dentin at all concentrations [8–10]. With regard to chelating agents, the decalcification effects depend heavily on the irrigant used, the application time, and the solution pH and concentration [11, 12]. The association of different solutions with capability to dissolve organic and inorganic components is
Proportion of Cesarean Deliveries According to Hospital Funding in S?o Paulo Metropolitan Area, Brazil  [PDF]
Priscila Ribeiro Raspantini, Zilda Pereira da Silva, Gizelton Pereira Alencar, Bárbara Laisa Alves Moura, Felipe Parra do Nascimento, Laura Cunha Rodrigues, Patrícia Carla dos Santos, Marcia Furquim de Almeida
Open Journal of Obstetrics and Gynecology (OJOG) , 2015, DOI: 10.4236/ojog.2015.514113
Abstract: Introduction: There has been an increase in the proportion of cesarean deliveries, especially in developing countries. Methods: Cross-sectional study of all hospital live births from mothers living in Sao Paulo Metropolitan Area, Brazil. Data were obtained from the Live Birth Information System, which is linked to the National Database of Health Establishments. Hospitals were classified as public, private or mixed. Descriptive analysis and exponential regression were conducted to evaluate time trends. Poisson regression was applied to analyze each hospital type to identify risk factors and the attributable risk fraction for cesarean section. Results: There was an annual increase (1.4%) of cesarean deliveries between 2000 and2013. In2009, the percentage of cesarean deliveries was 53% overall and 83% in private hospitals. The primary risk factor for cesarean delivery was delivery in a private hospital. Other risk factors that were stronger in public hospitals included the following: advanced maternal age, high maternal education, nulliparity, high number of prenatal visits, multiple pregnancy, hospital with low annual volume of deliveries, birth outside the city of residence and white skin color. Discussion: These results may be explained by the obstetric care model of private hospitals, which is not multiprofessional. Prenatal care and delivery are conducted by the same doctor and rarely include the input of another professional, such as a midwife. In addition, the mode of delivery influences the professional’s payment.
O egresso da Escola Técnica de Saúde da Unimontes: conhecendo sua realidade no mundo do trabalho
Cerqueira, Marília Borborema Rodrigues;Silva, Maria Patrícia;Crispim, Zaida ?ngela Marinho de Paiva;Garibalde, élika;Castro, Eveline Andries de;Almeida, Daiane Ribeiro;Maynart, Fabiano Rodrigues;
Trabalho, Educa??o e Saúde , 2009, DOI: 10.1590/S1981-77462009000200007
Abstract: this article presents results of the monitoring of graduates of the school of health technology at the state university of montes claros, discussing the contribution offered in the education and evaluation done by the students, as well as the professional level in which they find themselves. a telephone survey was used as quantitative methodology, using computer assisted telephone interviews which addressed graduates of technical courses in clinical laboratory science, nursing, pharmacy, dental hygiene, radiology, and trade, offered between june, 2003 and may, 2007. the main results indicate that 78.3% of graduates in the health sector are in the labor market, 73.9% receive one to two minimum wages, 85% recognize that the knowledge acquired helped improve the quality of their work, and 97.2% positively evaluated the faculty and the institution, enhancing the chances of qualification, since they have to overcome many obstacles in order to study. it was concluded that the school fulfills its educational and social role by qualifying professionals placed in health services, enabling their insertion and permanence in the labor market and providing opportunities of professional education for workers living in cities of northern minas gerais and other regions. the education developed by the school seeks inclusion, citizenship, and critical-reflexive education.
Anna Christina de Almeida,Délcio Bueno da Silva,Patrícia Helena Augusto,Bárbara Cardoso da Mata e Silva
Ciência Animal Brasileira , 2010,
Abstract: Aiming to determining brucellosis prevalence in the south region of Minas Gerais, Brazil, 1396 cows, 15 horses and 13 dogs from 41 farms positive to the ring test were tested. The serological buffered acidified antigen (BAA), slow tube serum agglutination (STSA), and 2-mercapto ethanol (2-ME) tests were used. The brucellosis prevalence was 4.66%% in cows, 33.3% in horses and 0% in dogs. It is expected that the obtained data obtained are valuable to consolidate the deployment of the National Program for Control and Eradication of Brucellosis, according to official recommendations, in the southern region of Minas Gerais.
Infec??o pelo HIV: descritores de mortalidade em pacientes hospitalizados
Thuler,Luiz Claudio Santos; Hatherly,André Luís; Góes,Patrícia Nascimento; Silva,Jorge Roberto de Almeida e;
Revista de Saúde Pública , 1998, DOI: 10.1590/S0034-89101998000600011
Abstract: objective: to assess the clinical-epidemiological descriptors of inpatient mortality in persons infected with the human immunodeficiency virus (hiv). method: all adult hiv/aids patients hospitalized at a university hospital in 1990, 1992 and 1994 were studied retrospectively. descriptive statistics for all variables of interest were generated. chi-square test and fisher's exact test were performed to compare categorical variables. means were compared using the student t test. stepwise logistic regression was used to identify the odds of dying associated with each risk factor. results: two hundred and forty patients were included in the study. between 1990 and 1994 the mean age rose from 35 to 36.9 years, the male/female ratio decreased from 9.8 to 2.0, the non-white proportion increased from 18.5 to 41.3% and the mean time between detection of hiv infection and hospitalization rose from 0.7 to 2.5 years. in addition, length of stay dropped from 31.3 to 25.3 days and the proportion of patients being followed up in the outpatient clinic of the universitary hospital increased from 47.8 to 83.3%. respiratory infections were the main cause of hospitalization (58.0%). oral candidiasis (27.1%), tuberculosis (18.3%), pneumocystis carinii pneumonia (15.4%) and toxoplasmic encephalitis (10.4%) were the most frequent opportunistic infections. multivariate analysis showed that the factors associated with a worse outcome included the length of stay less than or equal to 7 days (odds ratio [or]=3.88; p=0.02) and no outpatient follow-up at the hospital (or=3.29; p=0.01). conclusion: identification of independent risk factors for death may help in the implementation of more efficient interventions directed towards inpatients with hiv/aids.
Infec o pelo HIV: descritores de mortalidade em pacientes hospitalizados
Thuler Luiz Claudio Santos,Hatherly André Luís,Góes Patrícia Nascimento,Silva Jorge Roberto de Almeida e
Revista de Saúde Pública , 1998,
Abstract: OBJETIVO: Estudar os descritores clínico-epidemiológicos da mortalidade em pacientes internados por condi es clínicas associadas à infec o pelo HIV. MéTODO: Estudo retrospectivo de todos os pacientes adultos hospitalizados em 1990, 1992 e 1994 em hospital universitário. Os resultados foram descritos como números absolutos, percentagens e médias, sendo a significancia estatística entre as diferen as avaliada pelos testes do qui-quadrado, exato de Fisher ou t de Student, conforme o caso. Um modelo de regress o logística foi elaborado visando a identificar os principais fatores associados ao risco de evolu o para o óbito. RESULTADOS: Foram incluídos no estudo 240 pacientes. Entre 1990 e 1994 a idade média dos pacientes aumentou de 35,0 para 36,9 anos, a raz o entre os sexos masculino e feminino caiu de 9,8 para 2,0, a propor o de n o brancos cresceu de 18,5 para 41,3 e registrou-se um aumento do tempo médio entre a descoberta da infec o pelo HIV e a hospitaliza o de 0,7 para 2,5 anos. Observou-se a redu o do número médio de dias de hospitaliza o de 31,3 para 25,3 e aumento da propor o de pacientes em acompanhamento ambulatorial de 47,8 para 83,3%. As infec es respiratórias representaram a principal causa de hospitaliza o (58%) e as infec es oportunistas apresentadas com maior freqüência foram: candidíase oral (27,1%), tuberculose (18,3%), pneumonia por Pneumocystis carinii (15,4%) e neurotoxoplasmose (10,4%). Na análise multivariada, apenas o tempo de hospitaliza o menor ou igual a 7 dias (Odds Ratio [OR]=3,88; p=0,02) e a ausência de acompanhamento ambulatorial (OR=3,29; p=0,01) mostraram-se associados a um maior risco de evolu o para óbito. CONCLUS O: O conhecimento dos fatores associados a um risco aumentado de morte pode ser útil na tomada de decis o frente a pacientes hospitalizados com infec o pelo HIV.
Fractions of carbohydrates and of nitrogenous compounds of tropical grasses at different cutting ages
Campos, Patrícia Regina de Souza Siqueira;Silva, José Fernando Coelho da;Vásquez, Hernán Maldonado;Vittori, Andréa;Silva, Martinho de Almeida e;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000700021
Abstract: it was evaluated by the cornell system carbohidrates fractions and nitrogenous compounds of the following grasses at the cutting ages of 14, 28, 42, and 56 days: nilo grass (acroceras macrum), angola grass (brachiaria purpurascens), aleman grass (echinochloa polystachya), limpo grass (hemarthria altíssima), setaria grass (setaria anceps), tanner grass (brachiaria arrecta), and tifton-85 grass (cynodon spp). the experiment was carried out in a complete randomized block design, in a split plot arrangement in a way that the grasses were evaluated in the plots and the ages of cut in the split-plots. the age of cutting had an effect on the composition of the studied grasses. in most of the grasses, total carbohydrate levels, non-fibrous carbohydrates and a+b1 fraction carbohydrates increased linearly according to the age of cutting. the potentially degradable fraction of carbohydrates (fraction b2) showed a quadratic behavior according to the cutting ages for all grasses. the c fraction of the carbohydrates in tifton-85 grass linearly increased with the age but it did not increase significantly for the other grasses. in setaria grass, the intermediate levels of b2 and b3 nitrogenous fractions were high, which might represent a potential source of protein for ruminal degradation and for the small intestine. except for setaria grass, all studied grasses show similar values of the a, b1, b2 and b3 nitrogenous fractions.
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