Effect of enamel margin configuration on color change of resin composite restoration

Abstract

This study aimed to investigate the effect of enamel margin configuration on color change of resin composite restoration. Enamel disks of 1.0 mm-thick were sliced from sixty bovine anterior teeth and divided into three groups by margin configuration (non-bevel, 45-degree bevel and 45-degree reverse-bevel). The color measurements (L*C*h* values) at the restored bovine enamel disk with resin composite (Estelite Asteria, Estelite Pro, Kalore, Clearfil Majesty) were performed using a digital camera with CIE XYZ color gamut (RC500). All the resin composite restorations with non-beveled and beveled cavities significantly increased L* values compared with the control composite disks (p<0.05). The bevel preparation increased L* values toward the enamel-composite border with gentle inclination, while the reverse-bevel preparation was significantly lower L* values at the enamel-composite border than the non-bevel preparation (p<0.05). Enamel margin configuration affected color shifting of resin composite restoration and color adjustment of the border.

Influence of cavosurface angle on the stress concentration and gaps formation in class V resin composite restorations

“…Marginal bevelling is a procedure that can reduce marginal gap formation, improve fracture resistance (Coelho-de- Souza et al, 2008;Soliman et al, 2016), and result in improved esthetics (Aida et al, 2016). Marginal gap formation is the result of a localized failure due to stress concentration or insufficient bond strength (Braga et al, 2006).…”

Current perspectives on dental adhesion: (2) Concepts for operatively managing carious lesions extending into dentine using bioactive and adhesive direct restorative materials

“…The effect of the enamel margin on colour adjustment has also been investigated [ 39 ]. Three types of enamel margin (non-bevel, 45-degree bevel and 45-degree reverse-bevel) and four composite resin materials (Estelite Asteria A2B, Tokuyama Dental Corp., Japan; Estelite Pro A2E, Tokuyama Dental Corp., Japan; Kalore E2, GC Corporation, Japan; and Clearfil Majesty ES-2 Premium A2E, Kuraray Noritake Dental Inc., Japan) were studied in bovine enamel [ 39 ]. The study found that the enamel margin configuration affected colour adjustment at the borders of the restoration with the bevel preparation improving colour adjustment at the borders [ 39 ].…”

“…Three types of enamel margin (non-bevel, 45-degree bevel and 45-degree reverse-bevel) and four composite resin materials (Estelite Asteria A2B, Tokuyama Dental Corp., Japan; Estelite Pro A2E, Tokuyama Dental Corp., Japan; Kalore E2, GC Corporation, Japan; and Clearfil Majesty ES-2 Premium A2E, Kuraray Noritake Dental Inc., Japan) were studied in bovine enamel [ 39 ]. The study found that the enamel margin configuration affected colour adjustment at the borders of the restoration with the bevel preparation improving colour adjustment at the borders [ 39 ]. With regards to the four composite resin materials, they had different values for straight-line light transmission and light diffusivity within the materials and the degree of colour adjustment at the borders of the restoration was material dependent [ 39 ].…”

“…The study found that the enamel margin configuration affected colour adjustment at the borders of the restoration with the bevel preparation improving colour adjustment at the borders [ 39 ]. With regards to the four composite resin materials, they had different values for straight-line light transmission and light diffusivity within the materials and the degree of colour adjustment at the borders of the restoration was material dependent [ 39 ].…”

Influence of enamel prism orientations on color shifting at the border of resin composite restorations

“…Therefore, the outputs of the camera are linearly transformed into device-independent XYZ tristimulus values [15][16][17] . The authors demonstrated that enamel margin configuration affected color shifting of the resin composite in the cavity and improved color adjustment at the border of resin composite restorations 18) . Therefore, the purpose of this study was to investigate the influence of the enamel prism orientations on the color adjustment potential of resin composite restorations by evaluating color shifting at the enamel-composite border on the coronal and cervical sides in resin composite restorations in labial surface cavity using a CIE XYZ camera (RC500).…”