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17.233  Articles
1 of 1.724 pages  |  10  records  |  more records»
In this work, we have considered steady laminar magnetohydrodynamics (MHD) mixed convection flow of an electrically conducting fluid in presence of nanoparticles while water as the base fluid in a vertical square duct. The walls of the duct are thermally ... see more

In this paper, three-dimensional numerical simulations are carried out to investigate and analyze the gradual effects of thermal buoyancy strength on laminar flow of an incompressible viscous fluid and heat transfer rate inside a 180° curved channel of sq... see more

Agudizaciones endodónticas al concluir diferentes variantes técnicas de tratamiento pulporadicular / Incidence of endodontic acuteness when concluding the different technical variants in the pulp-radicular treatmentAgudizaciones endodónticas al concluir diferentes variantes técnicas de tratamiento pulporadicular / Incidence of endodontic acuteness when concluding the different technical variants in the pulp-radicular treatmentLas agudizaciones endodónticas constituyen eventos inflamatorios periapicales que se producen durante y después de concluida la terapéutica endodóntica, complicando y tornando más costosos dichos procederes. Para determinar su aparición e intensidad se realizó la presente investigación en la Clínica Estomatológica Docente Provincial "Antonio Briones Montoto" entre septiembre de 2007 y julio de 2008. El muestreo realizado fue de tipo opinático, constituido por 80 casos. Fueron divididos en 4 grupos de 20 casos, aplicándoseles diferentes esquemas de tratamiento. Los datos, recogidos en una planilla, se representaron en las tablas y gráficos en medidas resúmenes para variables cualitativas. Se empleó la estadística descriptiva: pruebas de 2 y K proporciones y la prueba no paramétrica Ji cuadrado. Se pudo constatar que el 17,5% de los casos tratados presentaron algún grado de agudización. El total de casos con agudizaciones resultó significativamente superior con la técnica estandarizada, no hubo diferencias en la aparición de las mismas en tratamientos en una o dos visitas, el mejor esquema de tratamiento empleado fue la técnica cérvico-apical en una sesión y los conductos abiertos al medio bucal el principal factor de riesgo asociado. Palabras clave: endodoncia, enfermedades periapicales, diagnóstico, tratamiento del conducto radicular / métodos. ABSTRACT Endodontic acuteness constitutes periapical inflammatory events that are produced during and after concluding the endodontic therapeutic, complicating and increasing the cost of the dental procedures. This research was aimed at determining their onset and intensity at "Antonio Briones Montoto" Dentist's Teaching Clinic from September 2007 to July 2008. The sampling was based on opinions and with 80 cases that were divided into 4 groups of 20 cases applying different treatment schedules. Data were collected in tables and graphics and in measures summed up to qualitative variables. A descriptive statistics was used: the two tests, K-proportions and the non-parametric chi-square test to compare the categories as well as the relation and homogeneity of the variables respectively. The total of the cases with acuteness resulted significantly higher with the standardized techniques, no differences in number or the intensity of the acuteness in the treatments in one and two sessions were observed, the best schedule of the treatment was the cervical-apical technique in a session. Key words: endodontics, periapical diseases, diagnosis, radicular duct treatment/methods.

ABSTRACT Endodontic acuteness constitutes periapical inflammatory events that are produced during and after concluding the endodontic therapeutic, complicating and increasing the cost of the dental procedures. This research was aimed at determining t... see more

Objective. Experimental studying of hepatic morphological changes and the blood biochemical indices in partial obstruction of common biliary duct (POCBD) without hyperbilirubinemia.Materials and methods. POCBD was simulated on 34 laboratory animals. The a... see more

Thermal and friction loss characteristics in a square-duct heat exchanger fitted with inclined-baffles are experimentally examined. Air as the test fluid enters the test duct having a uniform surface heat-flux. The baffles are placed repeatedly on both si... see more

Caracterización de las lesiones no palpables de la mama Caracterización de las lesiones no palpables de la mamaIntroducción: La detección de lesiones neoplásicas de la mama cuando aún no han llegado a hacerse palpables, representan un importante avance en el manejo y pronóstico del cáncer de mama. Objetivo: Caracterizar las lesiones no palpables de la mama en pacientes atendidas en el Hospital General Docente “Dr. Enrique Cabrera”. Material y Métodos: Se realizó un estudio descriptivo y prospectivo en pacientes femeninas con lesiones no palpables de mama desde febrero de 2009 a febrero de 2014 en el Servicio de Cirugía del Hospital General Docente “Dr. Enrique Cabrera”. La muestra fue de 65 pacientes, se clasificó según Breast Imaging Reporting and Data System (BIRADS). Las variables estudiadas fueron: edad, hallazgos mamográficos y anatomopatológicos. Se calculó la asociación a la malignidad mediante el Riesgo Relativo (RR) y el Odd Ratio (OR) con un intervalo de confianza (IC) de 95%. Resultados: Se encontraron 18 (27,7%) lesiones malignas y 47 (72,3%) lesiones benignas. El mayor número de casos (52,3%) se registró en el grupo de 50-64 años. Se observaron 25 imágenes nodulares, 31 microcalcificaciones, asociación de ambos 7 y 2 distorsiones del patrón mamario. Los nódulos mostraron mayor asociación al cáncer de mama (36%), seguido por las microcalcificaciones (25,8%), predominó el carcinoma ductal 72,2%. Conclusiones: El carcinoma de origen ductal fue predominante en nuestro estudio, además de demostrar que el riesgo decáncer en la categoría BIRAD 5 fuecuatro veces mayor que en las categorías BIRADS 3 y 4.Palabras clave: Lesiones no palpables de la mama, BIRADS, lesiones mamográficas, hallazgos anatomopatológicos, lesiones benignas, lesiones malignas, carcinoma ductal.ABSTRACTIntroduction: A great advance in management and prognostic of breast cancer is the early detection represented by non-palpable breast lesions. Objective: Characterize the non-palpable breast lesions in the Service of General Surgery at the Enrique Cabrera Hospital from February of 2009 to February of 2014. Material and Methods: It was carried out an observational, descriptive and prospective study. The sample constituted by 65female patients who had non-palpable breast lesions and classified according to Breast Imaging Reporting and Data System1993. The studied variables were: age, mammographic and anatomicopathological findings. To sum up, percent and absolute frequencies were used for statistical analysis and Chi-Square of Pearson test with significance of 0,05. The malignant incidence was calculates according to Relative risk (RR) and Odd Ratio (OR) with confidence interval (IC) 95%. Results: There were 1366 patients under screening, 65 of them had non-palpable breast lesions, 18 (27, 7%) malignant lesions and 47 (72, 3%) benign lesions. A major illness was found within 50 - 64 year old group. Twenty five nodules were found tightly associated with breast cancer (36%), 31 micro calcifications, both association seven and two patients with distortion of mammary structure. The ductal carcinoma was the most frequent neoplasm (72, 2%). Conclusions: Screen is a safety option for early diagnostic of non-palpable breast lesions.Key words: Non-palpable breast lesions, Breast Imaging Reporting and Data System (BIRADS), Mammographic lesions, malignant lesions, benign lesions, anatomicopathological findings, ductal carcinoma.

ABSTRACTIntroduction: A great advance in management and prognostic of breast cancer is the early detection represented by non-palpable breast lesions. Objective: Characterize the non-palpable breast lesions in the Service of General Surgery at the Enrique... see more

Transverse confining stress in concrete members, commonly provided by transverse reinforcement, has been recognized to enhance strength and ductility. Nowadays, the confining method has been further developed to external confinement approach. This type of... see more

Background: Management of obstructive jaundice from periampullary and pancreatic head malignancies is mostly palliative. With advancements in endoscopic and stent technology and instrumentation, endoscopicinterventions are gaining popularity and acce... see more

Introduction: Immunohistochemical expression of B-cell lymphoma 2 (BCL-2) is seen variably in invasive ductal carcinoma. This study was conducted to determine the frequency of BCL-2 expression in different histologic grades of invasive ductal carcinoma.&n... see more

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