Method: Rectangular-shaped specimens (3mm x 6mm) (n=18) of each FRC. Samples were cured with LED (Valo Cordless, standard potency of 1000mW/cm2) for 20s. In-ofice bleaching (37.5% HP) had their samples exposed to three applications of 8 minutes each, totaling 24 minutes of exposure, once a week, during a 3 week period. When the at-home bleaching (16% CP) was used, the application was performed daily also during 3 week period. After each application of the bleaching agents the samples were rinsed in tap water, dried with absorbent paper, immersed in distilled water and stored at 37°C. The Rawas measured using a roughness tester (Mitutoyo, Surftest SJ-210). Statistical analyses were performed using one-way ANOVA and a post hoc Tukey test (p<0.05).
Result: Ra results can be seen in the table below:
week 0 (control) |
week 1 |
week 2 |
week 3 |
||
TEF |
(37%) |
0.056 ±0.017 |
0.114 ±0.020 |
0.140 ±0.054 |
0.124 ±0.041 |
(16%) |
0.106 ±0.021 |
0.101 ±0.039 |
0.140 ±0.029 |
||
CMF |
(37%) |
0.083 ±0.014 |
0.114 ±0.032 |
0.149 ±0.032 |
0.153 ±0.033 |
(16%) |
0.125 ±0.063 |
0.116 ±0.030 |
0.144 ±0.068 |
||
EXF |
(37%) |
0.096 ±0.048 |
0.119 ±0.031 |
0.096 ±0.026 |
0.131 ±0.041 |
(16%) |
0.222 ±0.074 |
0.160 ±0.058 |
0.212 ±0.130 |
||
Conclusion: Time and Bleaching agent are significantly different (p<0.05), but the interaction between these factors is not significant. Interaction between Resin and Bleaching agent is not significant. Factor Resin, Tukey test (p<0.05) shows EXF is significantly different from TEF.