Caratteristiche morfosedimentologiche e tendenza evolutiva del Lago Lungo (Lazio meridionale)

Sono state analizzate le caratteristiche morfosedimentologiche del Lago Lungo (Lazio Meridionale) integrate da dati batimetri. Il lago risulta costituito da due bacini la cui soglia di separazione è un delta lacustre generato dagli apporti sedimentari da mare attraverso un canale emissario. Il confronto tra Modelli Digitali del Terreno costruiti attraverso le isobate riferite all’anno 2000 e quelle ricostruite prima dell’apertura del canale emissario, portano a stimare in poco meno di 26.000 mc il volume del deposito deltizio

Mechanical properties and degree of conversion of etch-and-rinse and self-etch adhesive systems cured by a quartz tungsten halogen lamp and a light-emitting diode

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)The aim of the present study was to evaluate the degree of conversion (DC), elastic modulus (E), and flexural strength (FS) of five adhesive systems (only the bonding component of both Scotchbond MP-SBMP and Clearfil Protect Bond-CP; Single Bond 2-SB2; One-up Bond F Plus-OUP; and P90 System Adhesive: primer-P90P and bond-P90B) cured with a quartz tungsten halogen (QTH) lamp and a light-emitting diode (LED). Two groups per adhesive were formed (n = 5), according to the light source (quartz tungsten halogen - QTH: Demetron LC; and light-emitting diode - LED: UltraLume 5). Bar-shaped specimens were evaluated using three-point bending. The DC was obtained by Fourier transform infrared spectroscopy (FTIR). SB2 and P90P exhibited better DC values for QTH curing. However, SB2 and P90P presented the worst results overall. The light source was statistically significant for all adhesives, except for P90B and OUP. Non-solvated adhesives presented the best E and FS values. It could be concluded that the DC and E values can be influenced by the light source; however, this interference is material dependent. (C) 2012 Elsevier Ltd. All rights reserved.12139143Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)FAPESP [2009/03763-0, 2009/15589-4]CNPq [304076/2009-0

Caratteristiche morfosedimentologiche e tendenza evolutiva del Lago Lungo (Lazio meridionale)

Sono state analizzate le caratteristiche morfosedimentologiche del Lago Lungo (Lazio Meridionale) integrate da dati batimetri. Il lago risulta costituito da due bacini la cui soglia di separazione è un delta lacustre generato dagli apporti sedimentari da mare attraverso un canale emissario. Il confronto tra Modelli Digitali del Terreno costruiti attraverso le isobate riferite all’anno 2000 e quelle ricostruite prima dell’apertura del canale emissario, portano a stimare in poco meno di 26.000 mc il volume del deposito deltizio

Effect of Tooth Bleaching on Bond Strength of Enamel-Dentin Cavities Restored With Silorane- and Dimethacrylate-based Materials

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)The aim of this study was to evaluate the influence of tooth bleaching on the push-out bond strength of a composite resin based on dimethacrylates and silorane to cavities that involve both enamel and dentin. A total of 80 bovine incisors were sectioned on the buccal surface to obtain specimens (10 x 10 mm) presenting enamel and dentin (1-mm thick each substrate). The specimens were randomly distributed into eight groups (n=10), according to the bleaching protocol (1 none; 2-10% carbamide peroxide [CP] for 21 days, six hours each day; 3 three applications of 35% hydrogen peroxide [HP] in 15-minute sessions, one session every seven days for three weeks; 4 10% CP for 18 days, six hours each day + three applications of 35% HP in 15-minute sessions, one session every seven days for three weeks) and the restorative system applied (Adper Single Bond 2 + Filtek Supreme; Filtek Silorane adhesive and composite resin). After treatment, cavities were made (1.2-mm diameter on dentin; 1.5-mm diameter on enamel) with a diamond bur. At 24 hours after restoration, a push-out bond strength test was performed at a crosshead speed of 0.5 mm/min. The bleaching treatments did not significantly affect the bond strengths of either restorative system to enamel-dentin. Regardless of the bleaching treatment, the dimethacrylate-based resin system exhibited significantly higher bond strengths to enamel-dentin than did the silorane-based system.364390396Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)FAPESP [2009/08992-7, 2009/03763-0, 2009/03661-2