Sr. Editor. El comienzo del año 2010 estuvo marcado en muchos países de América Latina por el impacto de una fuerte anomalía climática, cuantificada por la National Oceanographic and Atmospheric Administration (NOAA) de EUA, como un fuerte El Niño (Strong El Niño), con valores del ONI (Oceanic Niño Index) (promedio de la anomalía de la temperatura de la superficie del mar en la región 3,4 del N...

The world is getting warmer, both in the atmosphere and in the oceans. The year 2005 was the warmest year in over a century, according to a recent NASA report (2006A). Data gathered from 1995 to 2006 have revealed that 11 of the past 12 years have ranked among the 12 warmest years in the instrumental record. Observations since 1961 have shown that the average ocean temperature has increased to ...

Background and Aim: The use of composite restorations has increased in recent years. One of the most important problems with composite restorations is the loss of consistency between the composite and tooth color, which in most cases requires replacement. Materials and Methods: In this study, the color stability of 40 disc-shaped specimens (10 mm in diameter and 2 mm in height) from two types ...

In commercial point of view, it is of great interest to find colors with high color constancy level. Color constancy as a relatively property of object’s appearance could be affected by different factors. In this article, the color inconstancy index of CMCCON02 and CIELAB color coordinate of 1269 samples of Munsell at CIELchº color system to study any correlations, was calculated. The correspon...