Influência de diferentes fontes de luz na microdureza de resinas compostas para dentes clareados

Abstract

Objective: Evaluate the influence of different light sources in microhardness of different composites for bleached teeth. Method: 50 specimens, divided into 5 groups (n=10) according to resin: Spectra Smart XL BW (Dentsply/Sirona), Tetric N-Ceram – Bleach L (Ivoclar/ Vivadent), Opallis D-Bleach (FGM), Filtek Z350 XT WD (3M ESPE), Brilliant NG Bleach (Coltène/Whaledent). Then, each group was divided in two subgroup (n=5) according to light curing (halogen or second generation LEDs). Specimens were photocured during 40s with LED apparatus (Emitter C / Schuster) and with halogen light (Emitter L1 / Schuster). So, samples were stored in artificial saliva at 37 °C (±1°C) during 24 hours and submitted to Vickers microhardness three times per specimens with load of 50 grams, for 15 seconds. After, mean microhardness was obtained considering the average of the three indentations. Data were analyzed descriptive and inferentially, considering 95% confidence interval, α = 0.05 and 80% power. Results: There are not significant difference between subgroups (p>0.05), except for Filtek Z350 XT WD (3M ESPE) (p<0.05). However, there was significant difference in microhardness of composites evaluated (p <0.01), regardless of light source. Conclusions: The kind of light source applied on most composites did not interfered with the microhardness of composites.