Objective: The objective of this study is to compare the translucency of bulkfill resin composites by measuring contrast ratio (CR) and evaluate the effect of stump shades on final esthetics of bulkfill resin composites by measuring ΔE values.
Materials and Method: Specimens (n=5)/(Dimensions: 13x4mm) were prepared using the following materials- Group-1(Control): Tetric EvoCeram® (A2)/(Ivoclar Vivadent); Group-2: Tetric EvoCeram® Bulkfill (IVA)/(Ivoclar Vivadent); Group-3: QuiXX® (Universal)/(Dentsply Caulk). Specimens were prepared and light cured (Bluephase Style/Ivoclar Vivadent) according to manufacturer’s recommendations and polished (top/bottom surfaces) through 1200 SiC paper and alumina (50μm) slurry. CR (YBlack/YWhite) and baseline L*a*b* values (no background) were measured using UltraScan VIS spectrophotometer. IPS Natural Die material (Shade: ND1-ND9)/(Ivoclar Vivadent) slabs (Dimension- 16x19x5.5 mm) were prepared to simulate stump shades. L*a*b* values of experimental groups were measured again with IPS Natural Die material slabs as a background. A water soluble glycerin (Liquid strip/Ivoclar Vivadent) was used as a medium in between resin composites and die materials. ΔE values were measured among baseline values and various Natural Die materials respectively. Data was analyzed with ANOVA and Tukey’s HSD post-hoc test (α=0.05).
Results: (Mean±SD)
CR |
ΔE |
|||||||||
ND9 |
ND8 |
ND7 |
ND6 |
ND5 |
ND4 |
ND3 |
ND2 |
ND1 |
||
Group-1 |
0.94±0.013a |
0.63±0.14A |
0.63±0.08C |
0.84±0.18F |
1.81±0.32I |
1.20±0.12L |
1.46±0.26N |
1.37±0.17Q |
1.47±0.29S |
1.23±0.16V |
Group-2 |
0.89±0.014b |
1.61±0.35B |
1.52±0.12D |
1.86±0.26G |
3.05±0.19J |
2.34±0.24M |
2.27±0.24O |
1.890.15Q |
2.64±0.19T |
2.11±0.19W |
Group-3 |
0.85±0.014c |
1.80±0.33B |
1.99±0.11E |
2.21±0.33H |
4.17±0.65K |
2.80±0.19M |
3.12±0.44P |
2.46±0.49R |
3.01±0.39U |
3.22±0.24X |
*Similar superscripts within each column showed no significant difference.
Conclusion: Within the limitation of this study, significant difference in translucencies (CR) of tested materials was observed. Higher contrast ratio corresponded to decreased ΔE values.