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1
artículo
Background: Bulk-fill composite resins (BF) are used in posterior restorations with extensive and deep preparations. One of the most outstanding benefits is that it can be used in increments of 4 to 5 mm, reducing clinical working time. However, in teeth with root canal treatment, these preparations could be deeper. Objectives: To determine the photoactivation time necessary to polymerize a Bulk-Fill resin located in deep areas. Material and Methods: In the present experimental in vitro study, specimens of Filtek One Bulk Fill composite resin (3M ESPE, St. Paul, USA) of 5x5x5 mm color A2 photoactivated at a distance/time of 0 mm/10 s, 0 mm/20 s, 3 mm/10 s, 3 mm/20 s, 3 mm/30 s and 3 mm/40 s (n=5) were fabricated. Surface microhardness was recorded on the surface and at the base of each specimen. Results: The highest microh...
2
artículo
Publicado 2013
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Nowadays we possess diverse materials to realize posterior direct restorations as the seventh-generation adhesives and the nanotechnology resins systems. As well as the materials are changing in the time the same happens with the techniques and protocols to use. In the present article there is detailed the protocol of application of seventh-generation adhesives as agent of link and the application of a composite resin using the oblique incremental technique in cavities with and without glass ionomer in the resolution of a clinical case. Results: The obtained results were satisfactory for the patient since it was possible to restore adequately the dental piece involved returning the aesthetics and the lost function. Conclusions: The deep knowledge of the materials to be used as well as the techniques it is going to lead to optimizing of our rehabilitation treatment.
3
artículo
Meta-analyses show that the correlations of approaches to learning with academic achievement are low. However, only one study has controlled these correlations in the presence of intelligence. Our study investigates the incremental validity of the surface and deep approaches taking cognitive abilities as control and applied the multiple linear regression and CART regression tree method in a diversified sample of high school students from Minas Gerais, Brazil. We found a prediction of 20.37% and 35.20% of the outcome variance, through the linear regression and CART, respectively. Our results show that although cognitive abilities are more important than students’ approaches, the approaches have incremental validity and important roles as predictors of academic achievement.
4
artículo
Publicado 2013
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Nowadays we possess diverse materials to realize posterior direct restorations as the seventh-generation adhesives and the nanotechnology resins systems. As well as the materials are changing in the time the same happens with the techniques and protocols to use. In the present article there is detailed the protocol of application of seventh-generation adhesives as agent of link and the application of a composite resin using the oblique incremental technique in cavities with and without glass ionomer in the resolution of a clinical case. Results: The obtained results were satisfactory for the patient since it was possible to restore adequately the dental piece involved returning the aesthetics and the lost function. Conclusions: The deep knowledge of the materials to be used as well as the techniques it is going to lead to optimizing of our rehabilitation treatment.
5
artículo
Meta-analyses show that the correlations of approaches to learning with academic achievement are low. However, only one study has controlled these correlations in the presence of intelligence. Our study investigates the incremental validity of the surface and deep approaches taking cognitive abilities as control and applied the multiple linear regression and CART regression tree method in a diversified sample of high school students from Minas Gerais, Brazil. We found a prediction of 20.37% and 35.20% of the outcome variance, through the linear regression and CART, respectively. Our results show that although cognitive abilities are more important than students’ approaches, the approaches have incremental validity and important roles as predictors of academic achievement.
6
tesis de grado
Publicado 2025
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La suplantación de identidad representa una problemática creciente que compromete la seguridad institucional y genera riesgos en el acceso a áreas restringidas. Los sistemas convencionales de control, como el uso de tarjetas, contraseñas y verificaciones manuales, presentan vulnerabilidades que facilitan el ingreso no autorizado y afectan la integridad de los procesos críticos. Ante este contexto, la presente investigación propone el desarrollo de un sistema de reconocimiento facial orientado a prevenir la suplantación de identidad, mejorar la precisión en la identificación de usuarios y optimizar los mecanismos de control de acceso en entornos académicos y empresariales. El sistema fue desarrollado bajo la metodología ágil Scrum, lo que permitió un enfoque iterativo e incremental para su implementación y mejora continua. Para garantizar una identificación biométrica prec...
7
artículo
Publicado 2017
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To determinate the wave climate in deep water o˙ the Peruvian coast, instrumental data from satellite and buoys was employed to calibrate wave reanalysis from NCEP for the period 1979 to 2017. Wave data was calibrated using an exponential model described by Minguez et al. (2011). The results shows correlation coe°cient values between 0.7 to 0.9, also BIAS and RMSE showed acceptable values, which indicate a good approximation between both information databases. We have obtained wave information in deep waters which can be used to analyze average an extremely wave regimes to study coastal processes, and study the in˛uence of El NIÑO and La NIÑA phenomenon in the study area. This calibrated wave time series reveals that the average conditions for wave height is around 2 m, with maximum heights over 4 m. De predominant direction is from Southest for the northern and center zones, and So...
8
tesis de grado
Publicado 2022
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Antecedentes: Las resinas compuestas tipo Bulk-Fill se han desarrollado a lo largo de los años, y son usadas con mayor frecuencia en piezas posteriores con preparaciones más extensas y profundas. Este material muestra una menor contracción de polimerización. Uno de los beneficios más resaltantes es que, esta podría ser utilizada en incrementos de 4 a 5 mm, disminuyendo así el tiempo de trabajo clínico. Objetivos: Determinar el tiempo de fotoactivación necesario para polimerizar una resina Bulk-Fill ubicada en zonas profundas. Materiales y Métodos: En el presente estudio experimental in vitro, se confeccionaron especímenes de resina compuesta Filtek One Bulk-Fill (3M ESPE, St. Paul, EE.UU.) de 5x5x5 mm color A2 fotoactivado a una distancia de 0 mm/10 s, 0 mm/20 s, 3 mm/10 s, 3 mm/20 s, 3 mm/30 s y 3 mm/40 s (n=5). La microdureza superficial se registró en la superficie y en la...
9
artículo
Publicado 2023
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Three small plantations of Eucalyptus grandis (0.9 Ha), Pinus tecunumanii (0.3 Ha) and Cupressus macrocarpa (0.2 Ha) were established on a plot of land that had been used for agricultural purposes until 2004. Fifteen years later, depth of the mulch (Horizon Ao) generated for decomposition of organic matter of litter produced by the forest management practices was measured. In addition, samples were taken from the A1 horizon for analysis of pH, percentage of organic matter, phosphorus and potassium. Mulch deep results suggests low decomposition of vegetal material for Pinus tecunumanii plantations (9.85 cm), middle for Cupressus macrocarpa (6.18 cm) and higher for Eucalyptus grandis (5.91 cm). However, high organic matter values in horizon A1 are recorded in Cupressus macrocarpa (11.72%) and lower but close among them in Pinus tecunumanii (6.62 %) and Eucalyptus grandis (6.55%). A reducti...
10
tesis de maestría
Publicado 2017
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Euromotors S.A. is the exclusive brand representative of the Volkswagen, Audi, Porsche, and SEAT brands among others within 11 strategic business units in Peru. Since its foundation, the firm has since grown exceptionally in size, scope and sophistication from their original operational function as an automobile importer to their current status engaged in the sale of vehicles, new and used cars, servicing and sale of original spare parts. As a multi-brand firm, it maintains 1,052 employees who function relatively autonomously within each business division for the separate brands. In order to propel the firm forward as a cohesive unit, synergies within need to be created to eliminate the replication of processes and procedures and to ultimately streamline overall organizational function. After a few years of declining profitability, Euromotors is looking at opportunities to improve its co...
11
tesis de maestría
Publicado 2011
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La presente investigación tiene por finalidad evaluar la capacidad de adherencia última en el contacto suelo - lechada de cemento, como parámetro fundamental para el diseño de anclajes postensados cimentados en grava arenosa en estado medianamente denso a muy denso. La investigación fue financiada por la empresa GEOTÉCNICA S.A.C. con el objetivo de optimizar los proyectos de muros anclados, usados para contención de los taludes resultantes de la excavación para construcción de sótanos de las edificaciones en la ciudad de Lima. A través de los dieciséis (16) ensayos de arrancamiento ejecutados en anclajes reinyectables marca GEOTÉCNICA, y tomando como referencia numerosos ensayos de tensados ejecutados desde 1996 por GEOTÉCNICA S.A.C. en Perú, se ha llegado a descartar la influencia de la profundidad de cimentación del bulbo D, sobre los valores de t, Sin embargo, se aprec...
12
tesis de maestría
Publicado 2017
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Euromotors S.A. is the exclusive brand representative of the Volkswagen, Audi, Porsche, and SEAT brands among others within 11 strategic business units in Peru. Since its foundation, the firm has since grown exceptionally in size, scope and sophistication from their original operational function as an automobile importer to their current status engaged in the sale of vehicles, new and used cars, servicing and sale of original spare parts. As a multi-brand firm, it maintains 1,052 employees who function relatively autonomously within each business division for the separate brands. In order to propel the firm forward as a cohesive unit, synergies within need to be created to eliminate the replication of processes and procedures and to ultimately streamline overall organizational function. After a few years of declining profitability, Euromotors is looking at opportunities to improve its co...
