TY - JOUR
T1 - The combined effect of light-illuminating direction and enamel rod orientation on color adjustment at the enamel borders of composite restorations
AU - Hatayama, Takashi
AU - Kano, Yukinori
AU - Aida, Asami
AU - Chiba, Ayaka
AU - Sato, Kento
AU - Seki, Naoko
AU - Hosaka, Keiichi
AU - Foxton, Richard M.
AU - Tagami, Junji
AU - Nakajima, Masatoshi
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Objectives: To investigate the effect of light-illuminating direction (from composite or enamel side) on color adjustment at the coronal and cervical enamel borders in composite restorations. Materials and methods: Forty cylindrical holes (3.0-mm diameters) were prepared in bovine enamel disks (1.0-mm thickness). After application of a one-step self-etch adhesive, one of four resin composites (Estelite Asteria, EA; Estelite Pro, EP; Kalore, KA; Clearfil Majesty ES-2 Premium, MJ) was restored in the holes. After 24-h storage, the colors (L*, C*, or h* values) at the restored enamel disks over a black background were measured in a black box using a CIE XYZ camera, spotted with D65 standard illuminant either from coronal or cervical side at 45°/0° geometry. The color shifting rate was calculated at the coronal and cervical enamel borders of the composite restorations, and analyzed by three-way ANOVA with Dunnett’s T3 and t test for post hoc analysis (p < 0.05). Results: The light-illuminating directions significantly affected the L* shifting rate at the cervical enamel border in EP and MJ (p < 0.05), and the C* shifting rate at the coronal enamel border in EA, EP, and MJ (p < 0.05). Conclusions: The color appearance at the border of the composite restoration was influenced by the light-illuminating direction in conjunction with the enamel rod orientation in the coronal or cervical enamel border. Clinical relevance: The line-of-vision angle would affect the perception of color adaptation at the enamel borders in the composite restorations.
AB - Objectives: To investigate the effect of light-illuminating direction (from composite or enamel side) on color adjustment at the coronal and cervical enamel borders in composite restorations. Materials and methods: Forty cylindrical holes (3.0-mm diameters) were prepared in bovine enamel disks (1.0-mm thickness). After application of a one-step self-etch adhesive, one of four resin composites (Estelite Asteria, EA; Estelite Pro, EP; Kalore, KA; Clearfil Majesty ES-2 Premium, MJ) was restored in the holes. After 24-h storage, the colors (L*, C*, or h* values) at the restored enamel disks over a black background were measured in a black box using a CIE XYZ camera, spotted with D65 standard illuminant either from coronal or cervical side at 45°/0° geometry. The color shifting rate was calculated at the coronal and cervical enamel borders of the composite restorations, and analyzed by three-way ANOVA with Dunnett’s T3 and t test for post hoc analysis (p < 0.05). Results: The light-illuminating directions significantly affected the L* shifting rate at the cervical enamel border in EP and MJ (p < 0.05), and the C* shifting rate at the coronal enamel border in EA, EP, and MJ (p < 0.05). Conclusions: The color appearance at the border of the composite restoration was influenced by the light-illuminating direction in conjunction with the enamel rod orientation in the coronal or cervical enamel border. Clinical relevance: The line-of-vision angle would affect the perception of color adaptation at the enamel borders in the composite restorations.
KW - Color adaptation
KW - Color of resin composite
KW - Color shifting
KW - Enamel borders
KW - Enamel rod orientations
UR - http://www.scopus.com/inward/record.url?scp=85074326850&partnerID=8YFLogxK
U2 - 10.1007/s00784-019-03085-7
DO - 10.1007/s00784-019-03085-7
M3 - Article
AN - SCOPUS:85074326850
SN - 1432-6981
JO - CLINICAL ORAL INVESTIGATIONS
JF - CLINICAL ORAL INVESTIGATIONS
ER -