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Search Results: 1 - 10 of 110723 matches for " Hernández-Guerrero Juan Carlos "
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Bebidas embotelladas como fuentes adicionales de exposición a flúor
Loyola-Rodríguez,Juan Pablo; Pozos-Guillén,Amaury de Jesús; Hernández-Guerrero,Juan Carlos;
Salud Pública de México , 1998, DOI: 10.1590/S0036-36341998000500008
Abstract: objective. to evaluate and to report the concentration of fluoride in soft drinks and juices consumed in san luis potosí, s.l.p., mexico, and its implications as a risk factor for developing dental fluorosis. material and methods. the contents of some products from 2 main national companies and 2 other local companies were studied. the samples were collected from 10 different batches in the case of the soft drinks, and from 5 batches in the case of the juices, with 3 samples per batch, during 3 months. the ión selective electrode method was used to determine the concentration of fluoride. results. soft drinks from 2 main national companies showed high fluoride concentrations that were statistically significant between groups (p< 0.05). fluoride levels of products from local and national companies also showed differences that were statistically significant between groups (p< 0.05). all natural juices tested showed high fluoride concentrations. conclusions. most soft drinks and juices consumed in slp had high fluoride levels above mexican regulations (0.7 ppm) and could be a substantial risk factor for developing dental fluorosis.
Bebidas embotelladas como fuentes adicionales de exposición a flúor
Loyola-Rodríguez Juan Pablo,Pozos-Guillén Amaury de Jesús,Hernández-Guerrero Juan Carlos
Salud Pública de México , 1998,
Abstract: Objetivo. Evaluar y notificar la concentración de fluoruro en bebidas embotelladas que se consumen en la ciudad de San Luis Potosí, S.L.P., México y su implicación como factor de riesgo a fluorosis dental. Material y métodos. Se estudió el contenido de algunos productos de las dos compa ías refresqueras más importantes de México y de otras dos locales. Las muestras se recolectaron de 10 lotes diferentes en el caso de los refrescos y de cinco lotes en el de los jugos, con tres muestras por lote, durante tres meses. La determinación de concentración de fluoruro se realizó mediante el método del electrodo de ión selectivo. Resultados. La concentración de flúor de muestras de diferentes plantas de compa ías nacionales presentaron diferencias estadísticas significativas entre grupos (p< 0.05). La comparación de resultados entre compa ías nacionales y locales también mostró diferencia estadística significativa (p< 0.05). Los diferentes jugos presentaron concentraciones de flúor elevadas. Conclusiones. La mayoría de las bebidas embotelladas que se consumen en San Luis Potosí presentaron niveles de flúor por arriba de la norma mexicana (0.7 ppm) y pueden ser un factor de riesgo adicional de fluorosis dental en su población.
Fluorosis en dentición temporal en un área con hidrofluorosis endémica
Loyola-Rodríguez,Juan Pablo; Pozos-Guillén,Amaury de Jesús; Hernández-Guerrero,Juan Carlos; Hernández-Sierra,Juan Francisco;
Salud Pública de México , 2000, DOI: 10.1590/S0036-36342000000300005
Abstract: objective: the aim of the present study was to estimate the prevalence of dental fluorosis in primary dentition of a san luis potosi children population, and its association to fluoride concentration in drinking water and urine. an additional objective was, to develop, validate, and test a specific index for dental fluorosis in primary dentition. material and methods: from may 1997, to january 1999, we conducted a cross-sectional study to assess the prevalence of dental fluorosis in primary dentition. study subjects were 100 children aged 3-6 years, selected at random from three kindergartens in three risk areas of san luis potosi. the specific index of dental fluorosis for primary dentition (dental fluorosis for primary dentition index-dfpdi) was validated by estimating fluoride concentrations in enamel of teeth with and without dental fluorosis. the kruskal-wallis test was used to assess the association between fluoride concentrations in drinking water and urine, with dental fluorosis; the association between risk area and dental fluorosis was assessed with the mantel-haenszel c2 test. results: . the prevalence of dental fluorosis in primary dentition was 78%; primary molars were most affected in both maxillae and the predominant color was a non-glossy white appearance. we found a strong direct correlation (r=0.93) between fluoride concentrations in primary teeth and the dfpdi. associations were found between fluoride concentrations of drinking water and urine, with dental fluorosis (kruskal-wallis p=0.00001), and between risk area and dental fluorosis (mantel-haenszel c2 p=0.00001). conclusions: dfpdi allowed adequate identification and grading of dental fluorosis in primary dentition. it is important to detect the initial toxic effects of fluoride exposure to predict dental fluorosis in permanent dentition and skeletal fluorosis.
Fluorosis en dentición temporal en un área con hidrofluorosis endémica
Loyola-Rodríguez Juan Pablo,Pozos-Guillén Amaury de Jesús,Hernández-Guerrero Juan Carlos,Hernández-Sierra Juan Francisco
Salud Pública de México , 2000,
Abstract: OBJETIVO: Determinar la prevalencia de fluorosis dental en la población infantil de la ciudad de San Luis Potosí, y su asociación con la concentración de flúor en agua de consumo y de orina. Asimismo, desarrollar, validar y probar un índice específico para fluorosis en dentición temporal. MATERIAL Y MéTODOS: Se efectuó un estudio transversal analítico, de mayo de 1997 a enero de 1999, en tres jardines de ni os, seleccionados al azar, en tres áreas de riesgo en San Luis Potosí. Se seleccionaron 100 ni os de edades entre tres y seis a os. El índice específico de fluorosis para dientes temporales fue validado mediante la cuantificación de concentraciones de flúor en esmalte de dientes con y sin fluorosis. Para estimar la asociación entre las concentraciones de flúor en agua y orina y el grado de fluorosis dental se utilizó la prueba estadística Kruskal-Wallis. En el caso de la asociación entre el área de riesgo y el desarrollo de fluorosis dental se utilizó ji2 de Mantel-Haenszel. RESULTADOS: La prevalencia de fluorosis en dentición temporal fue de 78%, la cual tuvo patrones diferentes de presentación, siendo los dientes posteriores los más afectados en ambos maxilares y la coloración predominante fue blanco mate. Se encontró una correlación (r=0.93) entre la concentración de flúor en esmalte de dientes temporales y el índice de fluorosis para dentición temporal (IFDDT). Se encontraron asociaciones entre la concentración de flúor en el agua de consumo y orina con el grado de fluorosis dental (Kruskal-Wallis, p=0.00001) y entre el área de riesgo y el grado de fluorosis (ji2 de Mantel-Haenszel p=0.00001). CONCLUSIONES: El IFDDT identifica y gradúa adecuadamente la fluorosis en dentición temporal. Es importante detectar el primer efecto tóxico de exposición a flúor para ser usado como predictor de fluorosis en dentición permanente y fluorosis esquelética.
FLUORIDE LEVELS IN MéXICO CITY S WATER SUPPLIES
Juan Carlos Hernández-Guerrero,Constantino Ledesma-Montes,Maritza Cardiel-Nieves,Javier de la Fuente-Hernández
Revista internacional de contaminación ambiental , 2005,
Abstract: El propósito de este estudio fue conocer la concentración de fluoruros en los pozos de agua de la ciudad de México. Debido a que los sistemas Lerma-Cutzamala y Acuífero del Valle de México distribuyen el agua potable al área Metropolitana de la ciudad de México (AMCM), se analizó la concentración de fluoruros en 44 pozos de las cuatro zonas geográficas del AMCM durante el 2002. El muestreo del agua se realizó cada mes durante un a o. Los datos obtenidos mostraron un promedio de concentración de fluoruros de 0.70±0.20 mg/L. Se encontraron diferencias estadísticamente significativas entre las concentraciones de fluoruros de las diferentes zonas analizadas. A pesar de que las autoridades mexicanas del Sector Salud tienen bien definido que la concentración de fluoruro en el agua potable es entre 0.70 mg/L y 1.5 mg/L, se han reportado casos de fluorosis dental en la ciudad de México (Juárez-López et al. 2003). Es importante realizar una evaluación confiable de la concentración de fluoruros en las fuentes naturales de agua potable de la ciudad de México antes de implementar cualquier programa de prevención de caries e impedir la aparición de nuevos casos de fluorosis dental.
Fluoride concentration in toothpastes of the Mexican market
Hernández-Guerrero, Juan Carlos;de la Fuente H., Javier;Ledesma-Montes, Constantino;Fontana-Uribe, Bernardo;Jiménez-Farfán1, Dolores;
Boletín médico del Hospital Infantil de México , 2005,
Abstract: introduction. the most widely used method for applying fluoride (f-) topically is the fluoridated toothpaste. its early use in large quantities is a risk factor for dental fluorosis. objective: to determine the actual concentration of f in toothpastes sold in the mexican market. material and methods. sixty-five different commercial toothpastes were analysed using the f ion-specific electrode technique. results. the range of the f content was from 0 to 2 053 ppm. of them, 16.92% were toothpastes for infant use (range= 0-1153 ppmf-). mexican toothpastes had a mean of 879 ± 599.2 ppmf and imported toothpastes have a mean of 619.7 ppmf-; 54.5% of the infantile toothpastes presented f concentrations above 730 ppm and in 40% of the analyzed products, annotation on f content was found. conclusions. our results showed a wide variation in f concentration and suggest the need to implement policies to regulate the f concentration in these products. it is important that all the manufactured dentifrices show in the label and package the total f content of the product and the recommended doses will be printed, in order to prevent dental fluorosis.
Fluoride Consumption and Its Impact on Oral Health
María Dolores Jiménez-Farfán,Juan Carlos Hernández-Guerrero,Lilia Adriana Juárez-López,Luis Fernando Jacinto-Alemán,Javier De la Fuente-Hernández
International Journal of Environmental Research and Public Health , 2011, DOI: 10.3390/ijerph8010148
Abstract: Objective. The purpose of this study was to evaluate caries and dental fluorosis among Mexican preschoolers and school-aged children in a non-endemic zone for fluorosis and to measure its biological indicators. Methods. DMFT, DMFS, dmft, dmfs, and CDI indexes were applied. Fluoride urinary excretion and fluoride concentrations in home water, table salt, bottled water, bottled drinks, and toothpaste were determined. Results. Schoolchildren presented fluorosis (CDI = 0.96) and dental caries (DMFT = 2.64 and DMFS = 3.97). Preschoolers presented dmft = 4.85 and dmfs = 8.80. DMFT and DMFS were lower in children with mild to moderate dental fluorosis (DF). Variable fluoride concentrations were found in the analyzed products (home water = 0.18–0.44 ppm F, table salt = 0–485 ppm F, bottled water = 0.18–0.47 ppm F, juices = 0.08–1.42 ppm F, nectars = 0.07–1.30 ppm F, bottled drinks = 0.10–1.70 ppm F, toothpaste = 0–2,053 ppm F). Mean daily fluoride excretion was 422 ± 176 μg/24 h for schoolchildren and 367 ± 150 μg/24 h for preschoolers. Conclusions. Data from our study show that, despite values of excretion within an optimal fluoride intake range, the prevalence of caries was significant in both groups, and 60% of the 11- to 12-year-old children presented with dental fluorosis. In addition, variable fluoride concentrations in products frequently consumed by children were found.
Self-expanding metal stents versus antrectomy for the palliative treatment of obstructive adenocarcinoma of the gastric antrum Prótesis metálicas autoexpandibles versus antrectomía en el tratamiento paliativo del adenocarcinoma obstructivo del antro gástrico
Juan Octavio Alonso-Larraga,Julio César álvaro-Villegas,Sergio Sobrino-Cossio,Angélica Hernández-Guerrero
Revista Espa?ola de Enfermedades Digestivas , 2012,
Abstract: Background: gastric cancer patients are first diagnosed with an unresectable tumor in up to 40% of cases. Gastric outlet obstruction causes nausea, vomiting, dehydration and malnutrition. The aim of the study was to compare self-expanding metal stents to antrectomy and Roux-en Y gastrojejunostomy for palliation of obstructive adenocarcinoma of the gastric antrum. Methods: retrospective study in patients with obstructing cancer of the gastric antrum. Patients were divided into two groups: group A, underwent endoscopic placement of self-expanding metal stents and group B underwent surgical treatment with antrectomy and Roux-en Y gastrojejunostomy. Collected Data included: age, gender, performance status (Karnofsky's score), body mass index, histopathology, clinical stage (TNM classification), technical and clinical success of the procedure, time to oral intake, in-hospital stay, re-intervention rate, and complications related to the treatment and survival. Results: a total of 39 patients with gastric adenocarcinoma were included, 21 male and 18 female. Nineteen patients were assigned to group A and 20 patients to group B. There were no statistically significant differences between groups in regards to age, body mass index, Karnofsky's score and clinical stage. The technical and clinical success was similar for both groups. There was a statistically significant difference between groups favoring Self-expanding metal stent in time to oral intake (1 ± 0 vs. 4.9 ± 0.6 days, p = 0.0001) and in-hospital stay (0.94 ± 1.18 vs. 7.8 ± 7.7 days, p = 0.0005). We did not find statistically significant differences with regards to long-term survival. Conclusions: in patients with malignant gastric outlet obstruction due to gastric cancer, endoscopic palliation with self-expanding metal stents provide a shorter interval to oral intake, shorter in-hospital stay and lower rate of complications. Introducción: los pacientes con cáncer gástrico tienen un tumor irresecable hasta en el 40% de los casos. La obstrucción de salida gástrica ocasiona vómito, deshidratación y desnutrición. El objetivo de este estudio fue comparar las prótesis metálicas autoexpandibles con la antrectomia en el tratamiento paliativo del adenocarcinoma obstructivo del antro gástrico. Método: estudio restrospectivo en pacientes con adenocarcinoma obstructivo del antro gástrico. Los pacientes fueron divididos en dos grupos: grupo A) sujetos que fueron tratados mediante prótesis metálica autoexpandible y grupo B) aquellos que fueron tratados mediante antrectomía y gastroyeyunoanastomosis en Y de Roux. Las v
Argon plasma coagulation and hyperbaric oxygen therapy in chronic radiation proctopathy, effectiveness and impact on tissue toxicity
álvaro-Villegas,Julio César; Sobrino-Cossio,Sergio; Tenorio-Téllez,Luisa Catalina; Mora-Levy,José Guillermo de la; Hernández-Guerrero,Angélica; Alonso-Lárraga,Juan Octavio; Vela-Chávez,Teresa;
Revista Espa?ola de Enfermedades Digestivas , 2011, DOI: 10.4321/S1130-01082011001100004
Abstract: background: chronic radiation proctopathy (crp) is associated with recurrent rectal bleeding and transfusional requirements. argon plasma coagulation (apc) and hyperbaric oxygen therapy (hot) have been shown to be effective in the control of crp. no prospective comparisons have been reported between these treatments. aim: the aim was to evaluate the effectiveness, safety and impact on tissue toxicity of apc compared to hot in patients with crp. material and methods: a prospective study for evaluating treatment response was conducted. patients with cervical cancer and crp with rectal bleeding were recruited. they had not received previous treatment. collected data included: demographics, previous radiation dosage, duration and severity of rectal bleeding. hemoglobin, transfusional requirements, and tissue toxicity (soma lent questionnaire) at baseline and at 1, 2, and 3 months follow up were recorded. results: thirty-one patients were included, 14 in the apc group and 17 in the hot group. no response was noted in 13 and 18% of patients in the apc and hot group respectively (p = ns). at the 1 and 2 months follow-up, the apc group showed a significantly better response in terms of transfusional requirements (0.6 vs. 3.4 and 0.7 vs. 2.5) and tissue toxicity score (5.3 vs. 8.6 and 3.8 vs. 7.248). after 3 months, both groups showed further improvement in all parameters without significant differences between them. conclusions: apc and hot were effective, safe and decreased the tissue toxicity scores in patients with crp. however, response rate was higher and faster in the apc group.
Self-expanding metal stents versus antrectomy for the palliative treatment of obstructive adenocarcinoma of the gastric antrum
Alonso-Larraga,Juan Octavio; álvaro-Villegas,Julio César; Sobrino-Cossio,Sergio; Hernández-Guerrero,Angélica; Mora-Levy,Guillermo de la; Figueroa-Barojas,Paola;
Revista Espa?ola de Enfermedades Digestivas , 2012, DOI: 10.4321/S1130-01082012000400003
Abstract: background: gastric cancer patients are first diagnosed with an unresectable tumor in up to 40% of cases. gastric outlet obstruction causes nausea, vomiting, dehydration and malnutrition. the aim of the study was to compare self-expanding metal stents to antrectomy and roux-en y gastrojejunostomy for palliation of obstructive adenocarcinoma of the gastric antrum. methods: retrospective study in patients with obstructing cancer of the gastric antrum. patients were divided into two groups: group a, underwent endoscopic placement of self-expanding metal stents and group b underwent surgical treatment with antrectomy and roux-en y gastrojejunostomy. collected data included: age, gender, performance status (karnofsky's score), body mass index, histopathology, clinical stage (tnm classification), technical and clinical success of the procedure, time to oral intake, in-hospital stay, re-intervention rate, and complications related to the treatment and survival. results: a total of 39 patients with gastric adenocarcinoma were included, 21 male and 18 female. nineteen patients were assigned to group a and 20 patients to group b. there were no statistically significant differences between groups in regards to age, body mass index, karnofsky's score and clinical stage. the technical and clinical success was similar for both groups. there was a statistically significant difference between groups favoring self-expanding metal stent in time to oral intake (1 ± 0 vs. 4.9 ± 0.6 days, p = 0.0001) and in-hospital stay (0.94 ± 1.18 vs. 7.8 ± 7.7 days, p = 0.0005). we did not find statistically significant differences with regards to long-term survival. conclusions: in patients with malignant gastric outlet obstruction due to gastric cancer, endoscopic palliation with self-expanding metal stents provide a shorter interval to oral intake, shorter in-hospital stay and lower rate of complications.
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