The combined effect of light-illuminating direction and enamel rod orientation on color adjustment at the enamel borders of composite restorations

Takashi Hatayama, Yukinori Kano, Asami Aida, Ayaka Chiba, Kento Sato, Naoko Seki, Keiichi Hosaka, Richard M. Foxton, Junji Tagami, Masatoshi Nakajima*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

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.

Original languageEnglish
JournalCLINICAL ORAL INVESTIGATIONS
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • Color adaptation
  • Color of resin composite
  • Color shifting
  • Enamel borders
  • Enamel rod orientations

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