Fluorescence analysis of commercial and experimental composite resins

Method:  Eight specimens were prepared for each composite resin: Filtek^TM Z250, Filtek^TM Z350, Filtek^TM Z350 XT, Grandio^® and experimental with zirconia nanoparticles. Methods: Five human canines (Ethics Committee of Univ. Estadual Paulista – UNESP, Araraquara School of Dentistry, Protocol number: 38/2010) were used as reference. The specimens were made in a metallic mould (10x1mm). LED Celalux^® (VOCO) was used with 776 mW/cm² for 40s. A CCD camera (LG) coupled to objective lens with a system of four LED was used to capture the images. For each specimen, 16 images were captured and the mean values of captured images were obtained, which were converted into gray intensity scale. Analysis of Variance (ANOVA) and Tukey’s test (α = 5%) were used.

Result:  Both, Filtek^TM Z250 and the experimental composite resins showed the lowest fluorescence mean values, equivalent to each other. The fluorescence mean value for Filtek^TM Z350 (0.100; ± 0.006) was higher than Filtek^TM Z250 (0.084; ± 0.006), however equivalent to experimental composite resin (0.087;± 0.008). The other composite resins established the following fluorescence mean values: Filtek^TMZ350 XT (0.116; ± 0.007) < Tooth (0.162; ± 0.017) < Grandio^® (0.210; ± 0.010).

Conclusion: The composite resins did not present fluorescence similar to dental structure.