Résumé
Current evidence indicates that the minimum light intensity of photo curing units required to polymerize in a reliable way a composite resin, in increments of 2mm, is 300mW/cm2. The recent introduction of new generations of composite resin materials for large volume increments, partially contrasts with ISO 4049 (2009), calling for the use of light intensity of 1,000mW/cm2. Therefore, it is considered relevant to carry out periodic measurements of the emission intensity of light-curing units of clinical use. The aim of this study was to test the intensity [mW/cm2] of a representative sample of tungsten-halogen and LED photopolymerization units used in private and public health service in different areas of the Valparaíso Region in Chile. This was achieved through the use of dental radiometers, without considering the variables of intensity modification over time (either spontaneously, by undesirable inherent characteristics of the device, or by programs of intensity modification in time), or the density of accumulated power needed. This in vitro diagnostic test, evaluated a sample of 507 units, 107 halogen and 400 LED, for a period of around one month, using two radiometers as measuring instruments. For LED units the Bluephase Meter® radiometer, from Ivoclar-VivadentTM was used, and for halogen units we used the Coltolux® from ColténeTM. As a result, 85% of the LED and halogen units achieved the minimum requirements of intensity needed for the polymerization of conventional dental biomaterials. However, only 25% from the tested units achieved a power density of 1,000mW/cm2.
Sujets)
Humains , Technologie dentaire/instrumentation , Résines composites/effets des radiations , Équipement dentaire , Radiométrie , Chili , Halogènes , LumièreSujets)
Planification des soins du patient/normes , Restaurations dentaires permanentes/méthodes , Soins dentaires complets/méthodes , Caries dentaires/diagnostic , Caries dentaires/thérapie , Isolation de cavité dentaire , Coiffage pulpaire , Diagnostic buccal/méthodes , Équipe soignante , Préparation de cavité dentaire/méthodesRésumé
En la II Región Antofagasta-Chile, la zona de endemia chagásica con transmisión activa se circunscribe a las comunidades que habitan la meseta altiplánica, en tanto que el fenómeno de trasmisión pasiva (transfusional y congénita) en las áreas urbanas se ve incrementado por la constante migración de habitantes altiplánicos, de las III y IV Regiones del país. Con el propósito de mantener actualizados los datos sobre el riesgo de infección tranfusional en nuestro país, se realiza un estudio serológico de los donantes en 5 bancos de sangre de los principales centros hospitalarios de la II Región, utilizando la Reacción de Inmunofluorescencia Indirecta (RIFI-Chagas). La seropositividad global para los 5 establecimientos fué de 4,9% , con un rango que osciló entre 2,0% (Mejillones) y 12,1% (Calama). Los resultados revelan, una vez más, la imperiosa necesidad de implementar sistemas de vigilancia en los bancos de sangre para eliminar a nivel urbano la posibilidad de trasmisión de la infección chagásica por este mecanismo