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1
artículo
Publicado 2020
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It studies the beams of great can’t, which are used to withstand large loads or for architectural conditions. This investigation consists in the determination of the design of a discontinuous beam in totality, both in load and in geometry, using the strut-pull technique, therefore, using bibliographic information of similar research works, the structural design of this beam, the technique is recommended by the Peruvian Standard E.060. Subsequently, modeling was carried out in the AbaqusCAE software to determine steel reinforcement efforts, percentage of damage parameters, Von Mises and Tresca efforts, percentage of cracks and crushing percentage, resulting in a good design for this type of structures, which was verified in the software where it has a good behavior, concluding that, for samples with considerable discontinuities it is recommended to use the Strut and Tie technique.
2
artículo
Publicado 2020
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It studies the beams of great can’t, which are used to withstand large loads or for architectural conditions. This investigation consists in the determination of the design of a discontinuous beam in totality, both in load and in geometry, using the strut-pull technique, therefore, using bibliographic information of similar research works, the structural design of this beam, the technique is recommended by the Peruvian Standard E.060. Subsequently, modeling was carried out in the AbaqusCAE software to determine steel reinforcement efforts, percentage of damage parameters, Von Mises and Tresca efforts, percentage of cracks and crushing percentage, resulting in a good design for this type of structures, which was verified in the software where it has a good behavior, concluding that, for samples with considerable discontinuities it is recommended to use the Strut and Tie technique.
3
tesis de grado
Publicado 2025
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En cuanto a los estadios de la infección, tenemos a un inicio, un cuadro inflamatorio o dolor, que es el tiempo que más o menos este, que son los signos clínicos que básicamente el paciente. entonces en este cuadro podemos ver o podemos tener un poco más claro los estadíos o las etapas de nuestra de nuestra infección de origen dental, En cuanto al tiempo de evolución, tenemos un momento inicial de inoculación que suele ser de 3 días aproximadamente luego de eso, empieza el proceso llamado celulitis y luego se comienza a circunscribir en un absceso, en cuanto al tiempo evolución la celulitis suele ser de 2 a 7 días, dependiendo del grado sistémico del paciente y un absceso lleva a ser mayor a 5 días el dolor va a ir aumentando en intensidad y el tamaño en un inicio, el hecho de que sean micro absceso y que estén diseminados hace que esta atención a nivel de tejido se vuel...
4
informe técnico
En el presente trabajo de investigación desarrolla el diseño de un Controlador inteligente mediante la técnica de lógica difusa aplicado a un sistema en equilibrio Ball & Beam, el cual será llamado a lo largo de este trabajo como el sistema B&B. Este tipo de sistema es muy utilizado en aplicaciones académicas, de ese modo se demostrará como se lleva a cabo el equilibrio del sistema. El sistema en equilibrio B&B consiste en el movimiento de una bola por el interior de una viga en forma de carril sujeta al eje de un motor eléctrico que le permite girar alrededor de su eje. Se realizara el análisis de estabilidad del sistema en equilibrio y se diseñara el control Proporcional Derivativo (PD) en lazo cerrado y un control difuso para el sistema previamente linealizado, donde el control difuso hace la función de compensador para eliminar los efectos gravitacionales y otras dinámica...
5
artículo
Publicado 2021
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Los microtornillos interradiculares (MTI) son dispositivos de uso temporal diseñados para ser insertados en el hueso alveolar con la finalidad de mejorar el anclaje. El objetivo de este estudio fue presentar una guía para odontólogos que permita identificar los sitios anatómicos más apropiados para la inserción de estos dispositivos, logrando así, una mayor tasa de éxito clínico en los tratamientos. PUBMED, Google Académico y SciELO fueron las bases de datos utilizadas para la búsqueda de la literatura, se consideraron artículos publicados entre los años 2000 y 2020, en inglés y en español. Nuestra revisión sugiere según la bibliografía actual, realizar una planificación al comienzo del tratamiento de ortodoncia, utilizando guías generales para la inserción de MTI a través de mapas visuales de “zonas seguras” que existen entre los espacios interradiculares. Para...
6
artículo
Publicado 2021
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Interradicular miniscrews (MTI) are temporary devices designed to be inserted into the alveolar bone in order to improve anchorage. The aim of this study was to present a guide for dentists that allows identifying the most appropriate anatomical sites for the insertion of these devices, thus achieving a higher clinical success rate in treatments. PUBMED, Google Scholar and SciELO were the databases used to search the literature; articles published between 2000 and 2020, in English and Spanish, were considered. Our review suggests, according to the current bibliography, planning at the beginning of orthodontic treatment, using general guidelines for the insertion of MTI through visual maps of “safe areas” that exist between the inter-root spaces. For these, it was considered that the minimum amount of alveolar bone should be 3 mm.
7
tesis doctoral
Publicado 2017
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Objetivo: El objetivo del estudio fue determinar la validez de la tomografía computarizada de haz cónico Cone Beam realizada con el sistema I-Cat de Kavo® para la detección de lesiones de caries dental in vitro. Materiales y Métodos: Se evaluaron 108 dientes, 50 molares y 58 premolares; 184 superficies proximales y 98 superficies oclusales, con o sin lesión de caries dental. Se empleó como estándar de oro la evaluación histológica. Las imágenes radiográficas, tomográficas, así como las del estereomicroscopía fueron evaluadas por observadores calibrados. Resultados: Los valores de área debajo de la curva (Az) obtenidos para el sistema CBCT I-Cat fueron de 0.89 (0.84-0.93), para radiografía convencional 0.71(0.66-0.76), radiografía con sensor digital CCD 0.74(0.70-0.78) y radiografía digital con PSP 0.73(0.69-0.77). Se encontró diferencias estadísticamente significativ...
8
artículo
En este trabajo presentamos un modelo para la construcción de un tomógrafo portátil de pocas vistas. Se considera: (1) un tomógrafo de forma circular con 80 cm de diámetro, con imágenes reconstruidas circulares de 20 cm de diámetro. (2) El tomógrafo tiene 6 vistas con 36 conos por vista. Los 216 detectores están fijos sobre la superficie interna del tomógrafo. (3) Las fuentes puntuales están en posiciones fijas. Para la reconstrucción de imagen utilizamos una discretización que considera los caminos de la radiación entre la fuente y el detector, la intersección de estos caminos forman una discretización denominada base natural. El algoritmo de reconstrucción empleado es el r-ART, basado en utilizar la distancia de Bregman como un termino de regularización. La distancia de Bregman es construida con una función convexa que tiene un parámetro r=0.1. Presentamos ejemplos ...
9
artículo
The analytical model proposed by Bazant & Oh based on compatibility of deformations and equilibrium of forces in RC cross sections is extended and presented to predict short-time deformations. Stresses and deflections in beams strengthened with 01' without FRP plates epoxy- bonded to the tension face of rectangular and T cross sections. The theory assumes concrete to have a nonzero tensile carrying capacity. A parametric study was conducted to invesugate some design parameters such as plate area. plate stiffness and strength, concrete compressive strength and steel reinforcement ratio. To this end. moment-curvat ure diagrams lI'ere generated to know the influence of such parameters in the flexural response of the section. In all cases studied, adding the plate to the cross section increases the yield and ultimate tnoment capacity substantially in sections with a low steel reinforceni...
10
artículo
The analytical model proposed by Bazant & Oh based on compatibility of deformations and equilibrium of forces in RC cross sections is extended and presented to predict short-time deformations. Stresses and deflections in beams strengthened with 01' without FRP plates epoxy- bonded to the tension face of rectangular and T cross sections. The theory assumes concrete to have a nonzero tensile carrying capacity. A parametric study was conducted to invesugate some design parameters such as plate area. plate stiffness and strength, concrete compressive strength and steel reinforcement ratio. To this end. moment-curvat ure diagrams lI'ere generated to know the influence of such parameters in the flexural response of the section. In all cases studied, adding the plate to the cross section increases the yield and ultimate tnoment capacity substantially in sections with a low steel reinforceni...
11
revisión
Publicado 2019
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La reabsorción radicular externa es un efecto indeseable, resultante del movimiento dental ortodóntico, con pérdida irreversible de la estructura dentaria. De naturaleza compleja y multifactorial, donde diversos factores influyen en ella. Un diagnóstico presuntivo podría ser útil para su prevención, avance o pérdida de la pieza dentaria. En la práctica clínica utilizamos procedimientos radiográficos de rutina tales como las radiografías periapicales o panorámicas. Sin embargo, presentan ciertas limitaciones como la superposición de imágenes, errores de proyección e imágenes borrosas, eso es debido a la toma de imágenes bidimensionales de una estructura tridimensional. Considerándolas inadecuadas en la evaluación y detección de pequeñas zonas de reabsorción radicular. En la actualidad encontramos en nuestro medio la tomografía computarizada Cone Beam que brinda ven...
12
artículo
Publicado 2018
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Objective: To evaluate a quantitative method of bone maturation in cervical vertebrae in 14 Cone Beam computed tomographies of children aged 9 to 15 years old obtained from the archive of the Radiologic Service of the School of Dentistry at the National University of San Marcos. Methods: A retrospective, descriptive and transversal study was carried out. The sample was for convenience of 14 tomographies of children (seven male), these were clinically justified images, previously taken with the Picasso Master 3D - FOV 20x15 and processed with the EzImplant software; the head was positioned with reference to the Frankfort plane and the cuts were made. We used a quantitative method that established four stages of maturation in an objective way by means of an equation that used three measurements in the vertebrae C2, C3 and C4. Results: The highest percentage of children was found in the dec...
13
artículo
Publicado 2022
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Cone-beam computed tomography (CBCT) of the craniofacial structure has demonstrated its usefulness in the dental area during the last decades, thus it has become a fundamental tool in the diagnosis, planning, and evaluation of treatment, and although it was not developed for the exclusive use in dentistry, as it is commonly considered, it is used in other areas such as medicine. It is specifically used in the head and neck area where different medical specialties interact, and at the same time these interact with dental specialties, so knowing the advantages of CBCT over different imaging technologies in the medical area is necessary. The purpose of this review was to describe the applications of observation, diagnosis, planning, and evolution of treatments using maxillofacial HSCT in different medical specialties. This work highlights the use of TCHC in different medical applications an...
14
artículo
Publicado 2022
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Dental concrescence is an anomaly in which the cementum overlying the roots joins, causing the union of two different teeth. It is often reported in posterior dentition, affecting certain dental procedures such as root canal treatment, periodontal procedures, orthodontic movement, and dental extraction. This case report describes the successful diagnosis and treatment of a 20-year-old male with a moderate skeletal class II who was referred for a radiographic evaluation after 1 year of failed orthodontic movement of teeth 1.1 and 1.2. The radiographic assessment with a Cone Beam Computed Tomography allowed discarding other related pathologies and diagnosis of a dental concrescence. The patient underwent orthognathic surgery in which class II was corrected, and the concrescence was treated with a prosthetic approach.
15
artículo
Publicado 2021
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This article deals with the flexural reinforcement of reinforced concrete beams through carbon fiber reinforced polymer (CFRP), with the main objective of comparing the results obtained with a theoretical reinforcement design and those obtained in beams with CFRP reinforcement. tested under point load, as well as establishing the influence it has on the capacity of the beams to bending. The process of elaboration of the specimens with and without CFRP reinforcement and with the same amount of reinforcing steel is described, as well as the test carried out under point load to each beam, the amount of CFRP reinforcement is detailed, all this based on a beam obtained from the structural analysis carried out for a model building subjected to different overloads to generate an increase in the bending moment, making it necessary to place the CFRP reinforcement. Finally, the comparison between ...
16
artículo
Publicado 2021
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This article deals with the flexural reinforcement of reinforced concrete beams through carbon fiber reinforced polymer (CFRP), with the main objective of comparing the results obtained with a theoretical reinforcement design and those obtained in beams with CFRP reinforcement. tested under point load, as well as establishing the influence it has on the capacity of the beams to bending. The process of elaboration of the specimens with and without CFRP reinforcement and with the same amount of reinforcing steel is described, as well as the test carried out under point load to each beam, the amount of CFRP reinforcement is detailed, all this based on a beam obtained from the structural analysis carried out for a model building subjected to different overloads to generate an increase in the bending moment, making it necessary to place the CFRP reinforcement. Finally, the comparison between ...
17
artículo
Publicado 2022
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Root fractures are after caries and periodontal disease, the third cause of loss of dental units, being very common in posterior and endodontically treated teeth. The symptoms they produce are ambiguous and their diagnosis depends on the combination of multiple clinical and imaging factors. Among the diagnostic studies available to establish the origin of the symptoms is the cone beam computed tomography (CBCT). The objective of this case report is to describe the strategies used in the acquisition and interpretation of the CBCT in three patients with suspected root fractures. The use of a reduced field of view, with a voxel of 0.150 mm or less, accompanied by dynamic volume exploration made it possible to detect bone defects as an indirect sign for locating root fracture lines.
18
artículo
Publicado 2015
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La Tomografía Computarizada Cone Beam (TCCB) es una tecnología en rápido desarrollo que proporciona imágenes de alta resolución espacial del complejo craneofacial en tres dimensiones (3D). Durante la última década, el número de publicaciones relacionadas a la TCCB en la literatura se ha incrementado de manera significativa, pero la cuestión fundamental es si esta tecnología conduce a mejores resultados. La TCCB y su aplicación en la ortodoncia es muy importante ya que esta nueva tecnología va evolucionando cada vez más rápido y nuevas imágenes se necesitan para responder algunos casos como los de recidiva. La imagen tomográfica nos va permitir tener una visión diferente comparando con las imágenes convencionales, y esta visión va de la mano con los movimientos realizados para la corrección de la maloclusión o desproporción facial.
19
artículo
Publicado 2020
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Nasopalatine Canal (NPC) is an important structure that may be susceptible to damage during surgical procedures in the anterior maxilla, therefore a thorough examination of the anatomy and variants of the NPC is imperative for a good diagnosis and an appropriate treatment plan. Objective: To perform an anatomic characterization of NPC using Computed Beam Computed Tomography (CBCT). Material and methods: 154 images of CBCT were evaluated, in which the NPC was analyzed in terms of length, shape, and inclination with respect to the hard palate and the maximum anteroposterior of the incisive foramen (IF) in men and women of 18 years of age and onwards. Results: to the evaluation of the NCP in sagittal slices of CBCT, it presented different forms, it was found to the cylindrical shape as the most common in 89 patients (58%), followed by the funnel shape in 38 (25%), and the less frequent wer...
20
artículo
Publicado 2017
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This paper analyzes different types of failures in buildings of the cities of Portoviejo, Manta and Bahía de Caráquez during the earthquake of April 16, 2016. The evidence derived from the failures refer to existing codes and design considerations in order to reveal how modeling corresponds or not with different reinforcedconcrete columns, floor slabs and rigid frame buildings without structural walls. Given the diversity of constructive solutions found in the steel-deck slabs, a 23 factorial experiment design was performed to identify the influence and independence of the type of node, the rectangularity of the floor plan and the height of buildings on the strength and deformation parameters of floor slabs, in relation to the failures observed. Additionally, this paper undertakes a singular analysis approach of different failure causes in a building demolished in the city of Portoviej...
