introduction: discoloration of resin composites is a common reason for replacement of these restorations. the aim of this study was to eva-luate the influence of different light curing de-vices on color stability of a microhybrid resin composite. materials and methods: 80 disc-shaped speci-mens (8 mm in diameter, 2-mm height) were fabricated from filtek z250 resin composite. specimens were divid...

introduction : this in vitro study was designed to measure and compare the amount of temperature rise in the pulp chamber of the teeth exposed to different light curing units (lcu), which are being used for curing composite restorations. methods: the study was performed in two settings; first, an in vitro and second was mimicking an in vivo situation. in the first setup of the study, three grou...

Lake Matano includes a complex of sites related to an iron-smelting industry that developed at the northeast tip South Sulawesi between 8th and 17th centuries AD. The include recently discovered underwater which possibly submerged because earthquake had occurred in region. An interesting finding each site is presence flaked artifacts from chert. This raises question what was role chert local tr...

in suhrawardi philosophy – like any philosophy which seeks to explain the general facts of being – the issuance of plurality is an important element in the cosmology and defers with mashsha basis in this regard. the issuance of plurality contains several stages in suhrawardi's main works: agreement with mashsha’ on the emanation of the first caused, criticizing them for the issuance of und...

How does the effectiveness of guiding cues influence the development of motor skill autonomy? We utilized two sets of guiding cues (lights vs. reversed-lights conditions) that differed in their effectiveness to control a left-right leverpress sequence in rats. We separately measured the development of stimulus control by panel lights on guiding-cues trials and the development of stimulus contro...

This paper evaluates attitudes of Iranians toward crossing red traffic lights and their sensitivity to fines. Economic theory of crime under expected utility predicts that because of the possibility of severe punishments, risk adverse individuals would not cross red lights. This is implied by the Becker proposition. However, among 262 individuals surveyed, more than half of the sample has previ...