IADR Abstract Archives
Color Matching of Single-shade and Shade-selected Composites After Bleaching
Objectives: Shade-matching of composite restorations may be affected by dental bleaching. A single-shade universal composite has been introduced, claiming to simplify the shade matching for esthetic composite restorations. The goal of this study was to assess the shade matching of the single-shade universal composite compared with a conventional multi-shade composite before and after bleaching.
Methods: Two standard symmetrical preparations were placed on the facial surface of 6 anterior and 9 posterior extracted human teeth, and bonded with Clearfil SE Bond2 (Kuraray Noritake). The teeth shades were determined by two experienced clinicians using a standard Vita guide. On each tooth, one preparation was restored with a matching Filtek Supreme (FS, 3M) body shade in a single increment and the other preparation was restored with Omnichroma (OM, Tokuyama Dental) single-shaded composite. CIE L*a*b* values were recorded through colorimetric measurements (CR200, Konica-Minolta) at the mid-facial natural enamel, and at three locations within the restoration: composite body (COMP), incisal/occlusal margin (M1) and proximal margin (M2). Tooth-restoration ΔE were recorded at baseline and after bleaching with 40% hydrogen peroxide gel (Opalescence Boost, Ultradent). ΔE values were compared using ANOVA with a significance level of alpha=0.05.
Results: Initially, there was no significant difference in tooth-restoration ΔE between FS and OM, overall or at any measurement locations (p>0.05). After bleaching, ΔE significantly increased for both materials at all locations (p<0.005), except for OM at M1 (p=0.1). In comparison between FS and OM, there was a significant difference between the two materials in ΔE after bleaching at COMP and M1 (p<0.05).
Conclusions: The tooth-restoration perceived color difference was comparable between the single-shade and shade-selected composites prior to bleaching. Bleaching affected color matching of both composites, while the single-shade composite showed slightly, but statistically significantly, less color difference with tooth after bleaching compared with the shade-selected composite.
Methods: Two standard symmetrical preparations were placed on the facial surface of 6 anterior and 9 posterior extracted human teeth, and bonded with Clearfil SE Bond2 (Kuraray Noritake). The teeth shades were determined by two experienced clinicians using a standard Vita guide. On each tooth, one preparation was restored with a matching Filtek Supreme (FS, 3M) body shade in a single increment and the other preparation was restored with Omnichroma (OM, Tokuyama Dental) single-shaded composite. CIE L*a*b* values were recorded through colorimetric measurements (CR200, Konica-Minolta) at the mid-facial natural enamel, and at three locations within the restoration: composite body (COMP), incisal/occlusal margin (M1) and proximal margin (M2). Tooth-restoration ΔE were recorded at baseline and after bleaching with 40% hydrogen peroxide gel (Opalescence Boost, Ultradent). ΔE values were compared using ANOVA with a significance level of alpha=0.05.
Results: Initially, there was no significant difference in tooth-restoration ΔE between FS and OM, overall or at any measurement locations (p>0.05). After bleaching, ΔE significantly increased for both materials at all locations (p<0.005), except for OM at M1 (p=0.1). In comparison between FS and OM, there was a significant difference between the two materials in ΔE after bleaching at COMP and M1 (p<0.05).
Conclusions: The tooth-restoration perceived color difference was comparable between the single-shade and shade-selected composites prior to bleaching. Bleaching affected color matching of both composites, while the single-shade composite showed slightly, but statistically significantly, less color difference with tooth after bleaching compared with the shade-selected composite.
