Color stability of a nanofill composite: effect of different immersion media.
OBJECTIVE
The aim of this in vitro study was to evaluate the color stability of a nanofill composite resin (Filtek Z350) in different immersion media.


METHODS
Twelve resin-based composite specimens were prepared using a silicon cylindrical mold measuring congruent with 1mm of thickness and congruent with 10mm of diameter. Specimens were light-cured for 40 s from both sides using a LED Radii at 1400 mW/cm(2) and were randomized into 4 groups (n= 3) according to immersion media: coffee, yerba mate, grape juice or water (control solution). A digital spectrophotometer was used to evaluate the color changes at baseline and at 1-week after immersion in each solution. Specimens were stored in the different staining media for 4 h/day during 1 week. The color differences (DE) were analyzed by paired t-test and one-way ANOVA with complementary Tukey test (p<0.05).


RESULTS
After 1-week of immersion, a perceptive color change for the group stored in the grape juice compared to baseline (p=0.008) was observed. Coffee and yerba mate did not show any color changes visible for the human eyes or significantly different from the control group (p>0.05)


CONCLUSIONS
The findings of the present study suggest that the tested nanofill resin-based composite was susceptible to staining by substances present in the grape juice.
Fontes
Silvia Terra
ST
Department of Operative Dentistry, Dental School, Federal University of Pelotas, Pelotas, RS, Brazil.
Fernández
María Raquel
MR
de Moura
Claudia Modena
CM
Meireles
Sônia Saeger
SS
D001628:Beverages; D003069:Coffee / Q000737:chemistry; D003116:Color; D004396:Coloring Agents / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D055117:Curing Lights, Dental; D003764:Dental Materials / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D030019:Ilex paraguariensis / Q000737:chemistry; D007101:Immersion; D008422:Materials Testing; D053761:Nanocomposites / Q000737:chemistry*; D013053:Spectrophotometry; D013499:Surface Properties; D013997:Time Factors; D027843:Vitis / Q000737:chemistry; D014867:Water / Q000737:chemistry
D003069:Coffee; D004396:Coloring Agents; D003188:Composite Resins; D003764:Dental Materials; C533204:filtek Z350; D014867:Water