Search results for "ontología"
showing 10 items of 1426 documents
Reacción granulomatosa facial por rellenos cosméticos inyectados: presentación de cinco casos
2006
El uso de sustancias para el aumento de tejidos blandos por motivos estéticos puede ocasionar la aparición de granulomas a cuerpo extraño, entre otros efectos indeseables. Las mejoras introducidas en dichas sustancias han conseguido la disminución de la incidencia de reacciones adversas pero no su desaparición. Presentamos cinco casos de reacción a cuerpo extraño por tres productos diferentes, dimetilpolisiloxano (silicona), colágeno bovino, y ácido poliláctico, que habían sido infiltrados en el tejido celular subcutáneo de las pacientes (las cinco eran mujeres) entre dos y dieciséis años antes de la aparición de la reacción a cuerpo extraño. Las cinco presentaron un cuadro de tumefacción f…
The effect of glass ionomer and adhesive cements on substance P expression in human dental pul
2013
Objectives: The purpose of this study was to quantify the effect of glass ionomer and adhesive cements on SP expression in healthy human dental pulp. Study Design: Forty pulp samples were obtained from healthy premolars where extraction was indicated for orthodontic reasons. In thirty of these premolars a Class V cavity preparation was performed and teeth were equally divided in three groups: Experimental Group I: Glass Ionomer cement was placed in the cavity. Experimental Group II: Adhesive Cement was placed in the cavity. Positive control group: Class V cavities only. The remaining ten healthy premolars where extracted without treatment and served as a negative control group. All pulp sam…
Aportaciones de la herpetofauna al conocimiento de la paleobiología y paleoclimatología del tramo temporal Pleistoceno Superior y Holoceno de la Comu…
2022
El periodo Cuaternario se caracteriza climáticamente por la alternancia de fases glaciales e interglaciales, y, asociadas a ellas, importantes fluctuaciones de la línea de costa. Dado que este marco temporal es altamente relevante en el campo de la evolución humana y, por ello, gran parte de su estudio se ha centrado en esta temática; también lo es para entender diversos aspectos de la historia natural de otros grupos de vertebrados, como es el caso de los reptiles y anfibios. Hasta ahora son escasos los estudios del componente herpetológico de las faunas de vertebrados en el este de la península ibérica durante el Pleistoceno Superior y Holoceno, habiéndose centrado fundamentalmente este e…
Bone implant sockets made using three different procedures: a stability study in dogs
2012
Objective: This study compared the effects of three different methods of preparing bone implant sockets (drilling, osteotomes, and piezoelectric device) on osseointegration using resonance frequency analysis (RFA). Study Design: An experimental prospective study was designed. Material and Methods: Ten adult beagle dogs were studied. After 5 weeks, 23 out of 28 initially placed implants in the iliac crest were evaluated, comparing these three different procedures of bone implant socket. Student’s t-test (paired, two-tailed) was used to reveal differences among the three groups at each time point (SPSS 16.0, IL, USA). Results: After a 5-week healing period, the implants placed in sockets that…
Hemostatic agents used in apical surgery: a review
2011
Objective: A review was made of the current literature on hemostatic agents used in apical surgery in order to determine their effectiveness and adverse effects. Material and methods: The main search terms used were: endodontic surgery, apicoectomy, apical surgery, periradicular surgery, hemostasis, hemostatic agents, and bleeding control. The authors searched the Medline database for articles published up to 1 September 2010. Experimental and clinical studies comparing the effectiveness and/ or adverse effects of two or more hemostatic agents and published between 2000 and 2010 were included in the review. Results: Four studies were analyzed: two clinical studies and two experimental studi…
Relación entre la hepatitis crónica vírica B y/o C y el liquen plano bucal
2004
Introducción: La hepatopatía crónica es una patología producida, principalmente, por la ingesta alcohólica y por la infección de los virus de la hepatitis B y/o C. En los últimos años se ha discutido ampliamente la posible asociación entre la hepatopatía crónica y el liquen plano bucal. Recientemente, se ha especulado que la asociación entre liquen plano bucal y la enfermedad hepática tiene una base de origen vírica. Material y método: El objetivo de este estudio transversal emparejado es conocer si existe relación entre las hepatitis víricas B y/o C crónicas y el liquen plano bucal. Para ello, se seleccionaron dos grupos de 100 individuos cada uno: un grupo de casos, formado por pacientes …
Dental considerations in patients with liver disease
2011
Introduction: Liver diseases are very common, and the main underlying causes are viral infections, alcohol abuse and lipid and carbohydrate metabolic disorders. The liver has a broad range of functions in maintaining homeostasis and health, and moreover metabolizes many drug substances. Objective: An update is provided on the oral manifestations seen in patients with viral hepatitis, alcoholic and non-alcoholic liver disease, cirrhosis and hepatocellular carcinoma, and on the dental management of such patients. Material and methods: A Medline-PubMed search was conducted of the literature over the last 15 years using the keywords: “hepatitis”, “alcoholic hepatitis”, “fatty liver”, “cirrhosis…
Síntesis de los estudios sobre moluscos continentales neógenos del sector septentrional de la Depresión de Teruel: período 1775-1998
2006
Se recopila y analiza la información que se considera más relevante y se encuentra contenida en los estudios realizados sobre el registro fósil de los moluscos neógenos del sector septentrional de la Depresión de Teruel en el período comprendido entre los años 1775 y 1998. Se contabilizan, por una parte, el número total de taxones diferentes mencionados en cada trabajo y, por otra, sólo el número de citas efectuadas a nivel de especie en cada uno de ellos. Estas últimas se organizan en tres categorías que reciben el nombre de citas nuevas, especies nuevas y citas repetidas. Se propone, a partir de la información contenida en cada trabajo, el número de taxones contemplados, y la tipología de…
Trending topics in orthodontics research during the last three decades: A longitudinal bibliometric study on the top‐cited articles
2020
Objective: To perform a bibliometric analysis on the top-cited articles over the last three decades from 1989 to 2018, using a longitudinal set-up, in order to analyse how articles' features have evolved over time. Setting and sample population: A sample of 312 articles divided into three subgroups of 104 top-cited articles for each decade were included. The h-index value was used to determine the sample size. Materials and methods: The articles were identified through a search in the category "dentistry oral surgery and medicine" of the Web of Science database. The information relative to the articles was collected. Descriptive statistics was used to describe the articles and the journals;…
Microhardness of demineralized enamel following home bleaching and laser-assisted in office bleaching
2015
Background There is little data regarding the effect of tooth whitening on microhardness of white spot lesions. This study was conducted to investigate the effect of home-bleaching and laser-assisted in-office bleaching on microhardness of demineralized enamel. Material and Methods Forty bovine incisors were selected and immersed in a demineralizing solution for 12 weeks to induce white spot lesions. Enamel blocks were prepared and randomly assigned to two groups of 20 each. The first group underwent home bleaching with 15% carbamide peroxide which was applied for 8 hours a day over a period of 15 days. In the second group, in-office bleaching was performed by 40% hydrogen peroxide and powe…