Objectives:
The objective of this experiment was to evaluate the direct transmittance of the micro-hybrid composite resins charisma f, solitaire ii, intens and tetric ceram, and the nanofilled composite resins exthet-x and filtek supreme in the dentin and translucent shades.
Methods:
Three samples of each composite resin and shade were obtained with dimensions of 12 mm x 12 mm and 1mm thick. after light activation, three measurements for each sample were done with an uv-vis spectrophotometer. the spectra was analyzed by mean values for the percentage of direct transmittance at intervals of 20 nm in the range between 400 and 700 nm (%t) and the percentage of direct transmittance in the wavelengths of 400, 560 and 700 nm (t(d)).
Results:
The student's t-test showed that dentin shade of charisma f had significant higher %t than the translucent shade. for solitaire ii, intens, tetric ceram and esthet-x the translucent shade had higher %t than the dentin shade. for filtek supreme there was no statistical difference between the dentin and translucent shades. according to analysis of variance (anova) and tukey multiple-range test charisma f had the highest %t and t(d) at dentin and translucent shades, except for translucent shade at 700 nm, in which esthet-x had higher t(d).
Significance:
This study indicates that the percentage of direct transmittance is not directly related with the composite resin shade.