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

• Published in: Dental Materials Journal Vol. 37; no. 2; pp. 341 - 349
• Main Authors: KANO, Yukinori, NAKAJIMA, Masatoshi, AIDA, Asami, SEKI, Naoko, FOXTON, Richard M., TAGAMI, Junji
• Format: Journal Article
• Language: English; Japanese
• Published: Japan The Japanese Society for Dental Materials and Devices 2018; Japanese Society for Dental Materials and Devices; Japan Science and Technology Agency
• Subjects: Adhesive bonding; Animals; Cattle; Color; Color adjustment; Color of resin composite; Color shifting; Composite materials; Composite Resins - chemistry; Dental Enamel - chemistry; Dental Restoration, Permanent; Dentistry; Enamel; Enamel prism orientations; In Vitro Techniques; Methacrylates; Prisms; Restoration; Surface Properties; Color adjustment; Enamel prism orientations; Color of resin composite; Color shifting
• ISSN: 0287-4547; 1881-1361
• DOI: 10.4012/dmj.2017-094

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<0.05). The L* color shifting range was significantly affected by regions in the 3-mm cavity group (p<0.05), but not in the 1-mm cavity group (p>0.05), while the C* color shifting range was not significantly affected by regions (p>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.