Abstract
Objectives Single-shade composite systems are gaining popularity among clinicians due to the
claimed potential of blending with different tooth structure shades while restoring
the tooth. The purpose of this study was to evaluate the blending effect of two single-shade
composite with different shades of conventional resin composite systems.
Materials and Methods Seventy-two composite cylinders of B1, B2, A1, A2, A3, or A3.5 shade from CharmFil
Plus (CP) and Filtek Universal Restorative (3M) were prepared using custom-made silicone
mold. Single-shade composite OMNICHROMA (OC) or Beautifil II Enamel (BE) was placed
in the center of each cylinder and polymerized. The color parameters, lightness (L*),
chroma (C*), and hue (H*) of each composite were measured using a color chronometer.
Furthermore, color stability of the samples was evaluated after 1-week staining challenge.
Statistical Analysis Multivariant analysis was performed to evaluate the effect of material and shade
on the color parameters. Multiple comparisons of the data were performed using post
hoc test. The staining challenge data were analyzed using repeated measure analysis
of variance and paired sample T-test.
Results The multivariant analysis showed a statistically significant difference in color
parameters among CP, 3M, OC, and BE (p = 0.001). Image analysis showed a visual blending effect for both OC and BE for certain
shades; however, some color contrast with the darker shades was observed. The C* value
of OC showed a similar pattern to CP; however, the H* of the latter was closely followed
by BE. The L* value showed statistically significant difference among the shades of
3M, and in OC and BE when blended with 3M.
Conclusion All four materials used in this study showed color alteration after the staining
challenge. Single-shade composite can blend with only certain shades of resin composites.
Keywords
OMNICHROMA - blending effect - color stability - resin composite - single-shade composite
- Beautifil II Enamel
