Method: Disc shaped specimens (D=10mm, 2-mm thick, n=5 per shade/polisher) were prepared using A1 and A3 shade of the following flowable resin composites: Tetric EvoFlow (TEF, Ivoclar Vivadent), Filtek Supreme Ultra Flowable (FSF, 3M ESPE), PermaFlo (PFL, Ultradent), and G-aenial Flo (GFL, GC). Upon removal of Mylar layer, specimens were polished using PoGo (PD, Dentsply Caulk, Milford, DE), and ProGloss (PA, Axis Dental) one-step polishers for 60 seconds. Gloss was measured using gloss-meter (Novo-curve, Rhopoint Instrumentation) before and after exposure to accelerated aging at 300 kJ/m2 (Atlas SUNTEST XXL, Atlas Material Testing Technology).
Means and standard deviations were determined. The data were analyzed by analysis of variance and Fisher's PLSD intervals at a 0.05 level of significance.
Result: Mean (sd) gloss before (GU,B) and after aging (G,A), and gloss retention (GR,%) are listed in the table.
|
PoGo |
ProGloss |
||||
Comp/Shade |
GU,B |
GU,A |
GR,% |
GU,B |
GU,A |
GR,% |
TEF/A1 |
80(2) |
75(4) |
93 |
77(3) |
73(3) |
95 |
TEF/A3 |
79(2) |
73(3) |
92 |
75(3) |
67(3) |
90 |
FSF/A1 |
87(2) |
81(2) |
94 |
80(3) |
74(3) |
93 |
FSF/A3 |
84(2) |
79(4) |
94 |
78(1) |
74(4) |
94 |
PFL/A1 |
89(2) |
81(2) |
91 |
79(3) |
69(3) |
87 |
PFL/A3 |
88(4) |
79(6) |
90 |
80(4) |
72(3) |
90 |
GFL/A1 |
79(2) |
73(3) |
93 |
75(3) |
69(4) |
93 |
GFL/A3 |
81(3) |
75(3) |
93 |
73(3) |
67(3) |
92 |
Analysis of variance showed significant aging-dependent differences in gloss of composites (p<0.0001, power=1.0). Fisher's PLSD intervals for comparisons of aging, polishers, composites and shades were 1.0, 1.0, 1.3 and 1.0, respectively.
Conclusion: Gloss values of tested resin composites were affected by: aging (GU,B>GU,A), polisher (PG>PA), material (PFL=FSF>TEF=GFL) and shade (A1>A3). Aging-dependent decrease in gloss ranged from 5-13%.