Change of optical properties of contemporary polychromatic resin composites after light curing and finishing.
OBJECTIVE
To compare color and translucency changes after light curing and finishing in various shades of five contemporary resin composites.


METHODS
Light and dark (A1 & A4 or equivalents), enamel (e) and dentin (d), shades were selected from the resin composites Enamel Plus HRi (Micerium), Miris 2 (Coltene), IPS Empress Direct (Ivoclar), Filtek Supreme (3M ESPE) and TPH Spectum (Densply). Ten disc-shaped samples (depth = 10 mm, thickness = 1 mm) per material and shade were fabricated. Three colorimetric readings, over white and black background, according to the CIELab system were taken before and after light polymerization and after finishing with wet carbide papers. Color (ΔE) and translucency (ΔTP) differences were calculated. Results were analyzed by ANOVA, post-hoc Scheffe's test and linear regression analysis.


RESULTS
Polymerization provided a wide range of color change, ranging from 1.36 (Hri/UD1) to 8.07 (Miris/WB). Translucency increased in all groups, except Miris/NT. Translucency change varied from -0.4 (Miris/NT) to 8.88 (Hri/UE3). After finishing, ΔE ranged from 0.58 (Hri/ UD4) to 3.41 (Miris/NT). ΔE was significantly positively correlated with ΔL, Δb after curing and with ΔL, Δa, ΔTP after finishing.


CONCLUSIONS
Polymerization caused remarkable color and translucency changes, which were product and shade dependent. Thirteen out of 18 of the tested resin composites exhibited clinically perceptible (ΔE>2.6) color change after light curing and 2 out of 18 after finishing.


CONCLUSIONS
Shade matching with non-polymerized resin composite may be erroneous.
Sofia
S
Diamantopoulou
Efstratios
E
Papazoglou
Vasileios
V
Margaritis
Afrodite
A
Kakaboura
D003116:Color; D003124:Colorimetry; D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D003743:Dental Enamel / Q000033:anatomy & histology; D003764:Dental Materials / Q000737:chemistry* / Q000528:radiation effects; D003775:Dental Polishing / Q000295:instrumentation; D003804:Dentin / Q000033:anatomy & histology; D006801:Humans; D008027:Light; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D058105:Polymerization; D013499:Surface Properties
D003188:Composite Resins; D003764:Dental Materials; C474035:Filtek Supreme; C467914:TPH spectrum