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1.
Int. j interdiscip. dent. (Print) ; 13(2): 71-75, ago. 2020. tab, ilus
Article in Spanish | LILACS | ID: biblio-1134344

ABSTRACT

RESUMEN: Objetivo: Determinar las dimensiones de la cresta ósea vestibular de los incisivos maxilares con indicación de implantación inmediata. Pacientes y método: Un estudio transversal fue realizado en pacientes con necesidad de colocación de implantes inmediatos unitarios en la zona incisiva superior, durante el periodo de Enero-2015 a Diciembre-2017. Cortes tomográficos sagítales fueron utilizados para determinar la altura y el grosor de la cresta ósea alveolar vestibular. El punto de medición del grosor fue localizado a 4 mm apical a la linea amelocementaria. Un análisis T-student, fue utilizado para comparar las variables según la edad, el género y el grupo dentario, con un intervalo de confianza de 95%. Resultados: 298 imágenes fueron incluidas en la evaluación. El promedio de altura fue 10,68 mm, no hubo diferencias al comparar los grupos. El grosor promedio fue de 0,73 mm, diferencias de grosor, estadísticamente significativas, fueron observadas al comparar la edad y el género, no así en el grupo dentarlo. Conclusiones: La altura del hueso alveolar vestibular de incisivos superiores es suficiente para colocar implantes inmediatos dentro de un marco óseo. No obstante, el grosor observado, se traduciría en la necesidad de complementar la implantación con técnicas de regeneraciónn tisular guiada.


ABSTRACT: Objective : Determine the dimensions of the facial bone ridge of the maxillary incisors with indication of immediate implantation. Patients and method: A cross-sectional study was carried out in patients in need of single immediate implant placement in the upper incisor area, during the period from January-2015 to December-2017. Sagittal tomographic sections were used to determine the height and thickness of the vestibular alveolar bone ridge. The thickness measurement point was located 4 mm apical to the amelocementary junction. A T-student analysis was used to compare the variables according to age, gender, and dental group, with a 95% confidence interval. Results: 298 images were included in the evaluation. The mean height was 10.68 mm, there were no differences when comparing the groups. The mean thickness was 0.73 mm, statistically significant differences in thickness were observed when comparing age and gender, but not in the dental group. Conclusions: The height of the vestibular alveolar bone of the upper incisors could be sufficient to place immediate implants within a bone framework. However, the thickness observed would result in the need to complement the implantation with guided tissue regeneration techniques.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Aged , Aged, 80 and over , Therapeutics , Facial Bones , Incisor , Jaw , Cross-Sectional Studies
2.
Salud pública Méx ; 59(3): 276-284, may.-jun. 2017. tab, graf
Article in Spanish | LILACS | ID: biblio-903764

ABSTRACT

Resumen: Objetivo: Describir los intereses, preferencias temáticas y aprendizajes en el campo de la salud pública que emergen de escolares chilenos tras una experiencia de indagación científica escolar. Material y métodos: Estudio exploratorio de carácter cualitativo, realizado en 29 grupos de investigación escolar del proyecto Salud Con-Ciencia en tu Barrio, basado en un análisis de contenido de textos y narrativas de los estudiantes. Resultados: Los estudiantes priorizan la situación de animales abandonados, el manejo de la basura y la seguridad e infraestructura urbana visualizando el rol de los actores sociales y el impacto positivo/negativo en la comunidad, y valorando el conocimiento obtenido a través de la observación de barrios e interacción con vecinos. Conclusiones: La indagación científica escolar en el contexto barrial aporta estrategias didácticas para la promoción de la salud local y desarrolla nociones básicas de salud comuntaria y motivación en los estudiantes por vincularse con la realidad socioambiental de sus barrios.


Abstract: Objective: To describe the interests, preferred topics and learning in public health issues emerging from Chilean students with their participation in a science education experience. Materials and methods: A qualitative exploratory study was conducted in 29 school research groups through the project Salud Con-Ciencia en tu Barrio, based on a content analysis of texts and narratives of students. Results: Students prioritize the situation of abandoned animals, waste management, security and urban infrastructure, mainly. They view the role of social actors, the positive/negative impacts on the community, valuing the knowledge gained through observation neighborhoods and interaction with neighbors. Conclusions: Scientific inquiry school in the neighborhood context provides teaching strategies for the promotion of local health, develops basic notions of community health and motivation in students linked to the socio-environmental reality of their neighborhoods.


Subject(s)
Humans , Child , Adolescent , Health Education/methods , Schools , Science/education , Chile
3.
Biocell ; 36(2): 73-81, Aug. 2012. graf, tab
Article in English | LILACS | ID: lil-662144

ABSTRACT

After depletion of intracellular Ca2+ stores the capacitative response triggers an extracellular Ca2+ influx through store-operated channels (SOCs) which refills these stores. Our objective was to explore if human umbilical artery smooth muscle presented this response and if it was involved in the mechanism of serotonin- and histamine-induced contractions. Intracellular Ca2+ depletion by a Ca2+-free extracellular solution followed by Ca2+ readdition produced a contraction in artery rings which was inhibited by the blocker of Orai and TRPC channels 2-aminoethoxydiphenyl borate (2-APB), suggesting a capacitative response. In presence of 2-APB the magnitude of a second paired contraction by serotonin or histamine was significantly less than a first one, likely because 2-APB inhibited store refilling by capacitative Ca2+ entry. 2-APB inhibition of sarcoplasmic reticulum Ca2+ release was excluded because this blocker did not affect serotonin force development in a Ca2+-free solution. The PCR technique showed the presence of mRNAs for STIM proteins (1 and 2), for Orai proteins (1, 2 and 3) and for TRPC channels (subtypes 1, 3, 4 and 6) in the smooth muscle of the human umbilical artery. Hence, this artery presents a capacitative contractile response triggered by stimulation with physiological vasoconstrictors and expresses mRNAs for proteins and channels previously identified as SOCs.


Subject(s)
Humans , Boron Compounds/pharmacology , Muscle Contraction/drug effects , Muscle, Smooth/drug effects , Muscle, Smooth/metabolism , RNA, Messenger/genetics , Umbilical Arteries/drug effects , Vascular Capacitance/drug effects , Blotting, Western , Cells, Cultured , Calcium Channel Blockers/pharmacology , Calcium Channels/chemistry , Calcium Channels/genetics , Calcium Channels/metabolism , Calcium/metabolism , Histamine Agonists/pharmacology , Histamine/pharmacology , Membrane Proteins/genetics , Membrane Proteins/metabolism , Muscle, Smooth/cytology , Neoplasm Proteins/genetics , Neoplasm Proteins/metabolism , Real-Time Polymerase Chain Reaction , Reverse Transcriptase Polymerase Chain Reaction , Sarcoplasmic Reticulum/drug effects , Sarcoplasmic Reticulum/metabolism , Serotonin Receptor Agonists/pharmacology , Serotonin/pharmacology , TRPC Cation Channels/genetics , TRPC Cation Channels/metabolism , Umbilical Arteries/cytology , Umbilical Arteries/metabolism
4.
Ludovica pediátr ; 10(3): 81-91, Jun. 2008. tab, graf
Article in Spanish | LILACS | ID: lil-575295

ABSTRACT

El fumar tabaco durante el embarazo aumenta los riesgos en la salud materno-infanto juvenil provocando múltiples alteraciones atribuidas a la nicotina y al monóxido de carbono producidos por el cigarrillo.


Subject(s)
Pregnancy , Placenta , Pregnancy , Serotonin , Tobacco , Umbilical Arteries
5.
Medicina (B.Aires) ; 61(4): 481-90, 2001. ilus
Article in Spanish | LILACS | ID: lil-290388

ABSTRACT

La vena safena humana (VSH) se utiliza como puente en la cirugía de revascularización coronaria y de otros lechos arteriales, especialmente de miembros inferiores. Dado que los puentes de VSH presentan un porcentaje considerable de obliteración, numerosos estudios han investigado los factores que promoverían la producción de la estenosis en los mismos. Este artículo describe resultados sobre las condiciones estructurales y funcionales que confluyen para producir la obstrucción de los puentes de VSH. Se analiza la reactividad de la VSH a agonistas fisiológicos, incluídos los factores contrayentes y relajantes derivados del endotelio, por su importancia en determinar el vasoespasmo y en modificar la expresión de factores de crecimiento tisular y/o promotores de procesos trombóticos y ateromatosos. Se describen mecanismos involucrados en la regulación del estado contráctil de los miocitos lisos, en particular la actividad de canales de K+ de la membrana


Subject(s)
Humans , Coronary Artery Bypass/methods , Saphenous Vein/anatomy & histology , Saphenous Vein/physiology , Muscle Contraction/drug effects , Muscle Contraction/physiology , Muscle, Smooth, Vascular/drug effects , Muscle, Smooth, Vascular/physiology , Potassium Channels/physiology , Saphenous Vein/drug effects
6.
Acta physiol. pharmacol. ther. latinoam ; 48(2): 65-72, 1998. tab, graf
Article in English | LILACS | ID: lil-215283

ABSTRACT

This work includes results on chronotropic, inotropic and lusitropic changes induced by capsaicin on isolated rat atria. As regards spontaneous frequency, it was stimulated from 10(-9) M up to 7 x 10(-7) M of capsaicin. A simultaneous depression in developed force (F) showed a signigicant correlation with this positive chronotropic effect up to 7 X 10(-8) M of capsaicin, which is the result of the negative staircase phenomenon in the rat heart. The correlation was lost at 2 and 7 x 10(-7) M of capsaicin since in spite of the sustained increase in atrial rate the decrease in F was reversed and then depressed again at 2 and 7x 10(-6) M of capsaicin without changes in frequency. A concentration of capsaicin that overcome the negative staircase phenomenon, 5 x 10(-7) M, was tested as unique dose resulting in stimulation of the chronotropic, inotropic and lusitropic states of the atria. Percentual differences with respect to control values were maximal after 1-3 minutes for frequency (10+3 per cent), F (29+4 per cent), maximal velocity of force development (+F=50+12 per cent) (in all cases +F and -F,bold indicates +F and -F, respectively) and maximal velocity of relaxation (-F=64+13 per cent); a positive lusitropic effect was significant after 8-10 minutes (+F/-F=-17+7 per cent). Capsaicin did not affect the rat atria in the presence of 10(-6) M of ruthenium red, a blocker of capsaicin activation of sensory nerves, indicating that the stimulatory effects were entirely mediated by the release of neurotransmitters and that this concentration of capsaicin was not deleterous "per se". Capsaicin elicited similar inotropic responses in electrically driven isolated atria (+F=41+9 per cent) but the positive lusitropic effect was lost suggesting that capsaicin-induced increases in -F are limited at a frequency higher than the spontaneous frequency (11+6 vs. 32+4 per cent, respectively). 10(-6) M of CGRP8(-37), an antagonist of CGRP1 receptors, suppress the stimulatory effects of capsaicin on atrial contraction. In summary, atrial rate as compared to atrial contraction is more sensitive to the neurotransmitter released by capsaicin, which results in mechanical effects expressing the negative staircase phenomenon in the rat at low concentrations of capsaicin. The positive chronotropic, inotropic and lusitropic responses elicited by capsaicin are mediated by the reelease of neurotransmitters from sensory fibbers and no deletereous effects...


Subject(s)
Animals , Male , Rats , Capsaicin/pharmacology , Heart Atria/drug effects , Heart Rate/drug effects , Myocardial Contraction/drug effects , Receptors, Calcitonin Gene-Related Peptide/analysis , Capsaicin/analysis , Heart Atria/chemistry , Rats, Sprague-Dawley , Ruthenium Red , Stimulation, Chemical
7.
Medicina (B.Aires) ; 56(5/1): 518-26, sept.-oct. 1996.
Article in Spanish | LILACS | ID: lil-188417

ABSTRACT

Varios estudios epidemiológicos indican que hay una relación entre hiper-insulinemia, resistencia insulínica e hipertensión arterial. La insulina estimula el sistema nervioso simpático, produce retención renal de Na+ y modifica en forma directa mecanismos vasculares (contrayentes y relajantes); estos efectos pueden justificar que la insulina aumente o disminuya la presión arterial. la ausencia de los efectos vasodilatadores debido a resistencia insulínica y/o la mayor manifestación de los efectos hipertensores en caso de hiperinsulinemia podrían ser el nexo entre la insulina y la hipertensión arterial.


Subject(s)
Humans , Animals , Hyperinsulinism/complications , Hypertension/etiology , Insulin/pharmacology , Sympathetic Nervous System/drug effects
8.
Medicina (B.Aires) ; 56(6): 671-8, 1996. ilus, tab, graf
Article in Spanish | LILACS | ID: lil-196905

ABSTRACT

La insulina afecta mecanismos fisiológicos generales que regulan la presión arterial, y a nivel celular modifica las funciones del endotelio y del mosculo liso vascular, que son determinantes de la resistencia periférica. Describimos los efectos de la preincubación con insulina (40 muU/ml, durante 1-2 hs) sobre la reactividad contráctil de anillos intactos de aorta de rata y sobre la captaci>n de 45Ca2+ en segmentos de aorta de rata hipermeabilizados por tratamiento con EGTA. La preincubación con insulina no afectó las contracciones inducids por 1 muM de NA, ni la relajación de las mismas inducida por 10 mM de cafeína. La respuesta contractil a 1 muM de Ang-II (que en la aorta de rata es independiente de endotelio) fue estimulada por la preincubación con insulina en la fuerza máxima desarrollada y en la velocidad de relajación espontánea de la contracción. La diferencia en la captación de 45Ca2+ en RS entre los segmentos de aorta tratados y no tratados con insulina fue mayor a los 5 minutos con respecto a la medida a los 30 minutos. Se concluye que la preincubación con insulina afecta en forma directa la respuesta mecánica del mosculo liso aórtico estimulado con Ang-II y se propone a la modificación de la actividad del RS como uno de los mecanismos mediante el cual la insulina participa en la regulación del Ca2+ citosólico.


Subject(s)
Animals , Rats , Humans , Aorta/drug effects , Calcium/metabolism , Insulin/pharmacology , Muscle Contraction/drug effects , Muscle, Smooth/drug effects , Angiotensin II/pharmacology , Insulin/administration & dosage , Rats, Wistar , Sodium/pharmacology , Time Factors
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