Objective:To determine and compare the micro topographic characteristics of dental implants submitted to different surface treatments, using scanning electron microscopy (SEM).Materials and Methods:Implants were divided into 7 groups of 3 specimens each, according to the surface treatment used: group 1: Osseotite, BIOMET 3i; group 2: SLA surface, Institut Straumann AG; group 3: Oxalife surface, Tree-Oss implant; group 4: B&W implant surface; group 5: Q-implant surface; group 6: ML implant surface; group 7: RBM surface, Rosterdent implant. The surfaces were examined under SEM (Carl Zeiss FE-SEM-SIGMA). Image Proplus software was used to determine the number and mean diameter of pores per area unit (mm). The data obtained were analyzed with the Mann-Whitney test. A confocal laser microscope (LEXT-OLS4100 Olympus) was used to conduct the comparative study of surface roughness (Ra). Data were analyzed using Tukey's HSD test. Results:The largest average pore diameter calculated in microns was found in group 5 (3.45 µm+/-1.91) while the smallest in group 7 (1.47µm+/-1.29). Significant differences were observed among each one of the groups studied (p<0.05). The largest number of pores/mm2 was found in group 2 (229343) and the smallest number in group 4 (10937). Group 2 showed significant differences regarding the other groups (p<0.05). The greatest roughness (Ra) was observed in group 2 (0.975µm+/-0.115) and the smallest in group 4 (0.304µm+/-0.063). Group 2 was significantly different from the other groups (p<0.05).Conclusion:The micro topography observed in the different groups presented dissimilar and specific features, depending on the chemical treatment used for the surfaces..

Aim: To determine the flexural strength and elastic modulus of high, medium and low density composite resins. Material and methods: 88 specimens of 25mmx2mmx2mm were divided into 11 groups of 8 according to the resin. Group 1: Filtek Z350 XT, ) and lower Wave Flow (2.17 +/-0.13) with significant differences (p<0,05). The time influenced significantly increasing values for both tests (p<0,05). Conclusion: Composite resins showed different behaviors. Time factor influenced increasing values excepting Rok and Filtek Z250 XT which kept its approximately equal values.

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