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This study aimed to investigate the influence of enamel prism orientations on color adjustment of resin composite restoration. The color measurements (L*, C*, or h* values) at the restored bovine enamel disk (1.0 mm-thick) with resin composite (Estelite Asteria, Estelite Pro, Kalore, Clearfil Majesty) were performed using a CIE XYZ camera (RC500). The color shifting rate and range at the coronal and cervical border were calculated. The coronal border was significantly lower L* and C* color shifting rate than the cervical border (p&lt;0.05). The L* color shifting range was significantly affected by regions in the 3-mm cavity group (p&lt;0.05), but not in the 1-mm cavity group (p&gt;0.05), while the C* color shifting range was not significantly affected by regions (p&gt;0.05). The coronal enamel border with diagonal-cut of enamel prisms would have an advantage for color adjustment of resin composite restorations compared to the cervical border with longitudinal-cut of enamel prisms.

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