Search results for "Stomatognathic Diseases"
showing 10 items of 1650 documents
EPR DOSIMETRY IN A MIXED NEUTRON AND GAMMA RADIATION FIELD
2004
Suitability of Electron Paramagnetic Resonance (EPR) spectroscopy for criticality dosimetry was evaluated for tooth enamel, mannose and alanine pellets during the 'international intercomparison of criticality dosimetry techniques' at the SILENE reactor held in Valduc in June 2002, France. These three materials were irradiated in neutron and gamma-ray fields of various relative intensities and spectral distributions in order to evaluate their neutron sensitivity. The neutron response was found to be around 10% for tooth enamel, 45% for mannose and between 40 and 90% for alanine pellets according their type. According to the IAEA recommendations on the early estimate of criticality accident a…
The measurement of impurities in silicon for solar cell production
2012
The power conversion efficiency of solar cells is largely dependent on impurity levels in silicon. In the current investigations two sample preparation methods of silicon had been used before analysis - acid dissolution at atmospheric pressure and pressured microwave assisted technique. Quantification of impurities in solar silicon was done by inductively coupled plasma mass spectrometry and electrothermal atomic spectrometry. Microwave assisted dissolution of solar silicon was more effective compared to the traditional dissolution method on the hot plate, but complete dissolution of impurities and silicon matrix was achieved with a nitric and hydrofluoric acid mixture. The mass of solar si…
Determination of the atmospheric precipitation pH value on the basis of the analysis of lichen cationoactive layer constitution
2006
Studies of equilibria and kinetics of the ion exchange process between the surrounding (water solution) and lichens prove that the number of mobile hydrogen ions bonded in lichens depends on the concentration of hydrogen ions in the precipitation with which the lichens are in contact and the type and concentration of other cations contained in the precipitation. The measurement of these values was suggested; as a result, it enabled to determine the pH of precipitation by determination of mobile cations bonded in exposed or naturally grown lichens. The studies were conducted on Hypogymnia physodes lichens.
TLR7 controls VSV replication in CD169(+) SCS macrophages and associated viral neuroinvasion
2019
Vesicular stomatitis virus (VSV) is an insect-transmitted rhabdovirus that is neurovirulent in mice. Upon peripheral VSV infection, CD169+ subcapsular sinus (SCS) macrophages capture VSV in the lymph, support viral replication, and prevent CNS neuroinvasion. To date, the precise mechanisms controlling VSV infection in SCS macrophages remain incompletely understood. Here, we show that Toll-like receptor-7 (TLR7), the main sensing receptor for VSV, is central in controlling lymph-borne VSV infection. Following VSV skin infection, TLR7−/− mice display significantly less VSV titers in the draining lymph nodes (dLN) and viral replication is attenuated in SCS macrophages. In contrast to effects o…
E-Oral, una herramienta para evaluar la expresión oral y la comprensión auditiva a distancia
2016
E-Oral es la aplicación informática que el Centro de Idiomas (CUID) de la UNED utiliza para evaluar las destrezas orales de los alumnos matriculados en cursos virtuales de idiomas. Esta herramienta permite evaluar de forma asincrónica. No es, sin embargo, una prueba completamente automatizada, puesto que los evaluadores son humanos. Las denominadas tecnologías del habla presentan aún hoy ciertas restricciones que limitan su experimentación en el campo de la evaluación y la certificación lingüística. El artículo es una presentación de la herramienta. Palabras clave: tecnologías del habla, evaluación, expresión oral, comprensión auditiva. E-oral, a tool to assess oral expression and liste…
Risk of Periodontal Disease: Is there a Correlation with the Type of Antihypertensive Medication?
2011
Introduction: The purpose of this study was to evaluate the effects of long-term oral antihypertensive treatment using centrally acting sympatho-inhibitory drugs (clonidine) and beta-blockers (metoprolol) on capillary microcirculation in the labial and periodontal mucosa.
 Methods: Sixty subjects were recruited for the study: 20 patients affected by hypertension in treatment with centrally-acting sympatho-inhibitory drugs (64.28 ± 11.78 years); 20 patients in treatment with beta-blockers (62.03 ± 9.84 years) and 20 healthy subjects (62.06 ± 6.72 years). We use the videocapillaroscopic technique to evaluate in vivo the microcirculation of the labial mucosa corresponding to the lower lip…
TEMPORARY AESTHETIC RECONSTRUCTION OF A FRACTURED FRONT TOOTH DURING ENDODONTIC TREATMENT BY MEANS OF A HALLOW POST MADE IN A DENTAL OFFICE. A CASE S…
2012
A fractured front tooth at gum level triggers significant changes in human physiognomy. If, in addition to this, a chronic apical lesion occurs, the aesthetic treatment is postponed in most cases. This article describes the way in which we managed to temporarily restore the aesthetic aspect of some patients with fractured superior incisors and chronic apical lesions using a hollow post made in the dental office.
IMPLANT-PROSTHETIC REHABILITATION OF UNIDENTARE EDENTATION – PRINCIPLES OF TREATMENT
2015
For a practitioner with experience, the restoration with one or two individual crowns is relatively simple from clinical and technical point of view, but if a single crown has to be rebuilt in areas with major aesthetic concern, the prosthetic restoration becomes a challenge for any team of professionals. A major challenge for such a team si the unidental restoration, with or without implants, of a single incisor from the frontal maxillar area, especially the central superior incisors. These teeth have a highly aesthetic part since they are in direct connection with the shape and the aspect of the face. In the evaluation of the dental shape of the central incisors we can use different param…
ANALYSIS OF THE RADIO-OPACITY OF A SELF-ETCH ADHESIVE
2012
Introduction. At present, self-etch adhesive systems are employed on large scale in the offices of dental medicine due to their simple application technique. Their radioopacity is important for the identification of this material in paraclinical examinations. Scope. The study describes a technique of radioopacity analysis on a self-etching type adhesive material. Materials and method. Class V cavities have been made on the teeth extracted from orthodontic causes. The dental adhesive was applied on the surface of the cavities, followed by their obturation with a composite material. The teeth were sliced, radiographed, the resulting digital images being analyzed with a specialized software. R…
STRATIFICATION TECHNIQUE OF A NANOCOMPOSITE USING THE SILICON GUIDE
2015
At present, the stratification technique of composite materials, known as offering most predictable, both functional and aesthetic results, uses a silicone reference quide. This allows the dentist to appreciate the size and thickness of the composite resin layer to be applied, as well as selection of the opacity and translucidity degree according to the reconstructed enamel or dentin structure, thus facilitating the stratification of materials. The minimum adjustment, at the level of the palatal wall, represents another great advantage of the silicone key.