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

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Clinical Oral Investigations Aims and scope Submit manuscript

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.

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Author contribution statement

Takashi Hatayama: Main research executor

Yukinori Kano: Sub research executor and advisor of color measurement

Asami Aida: Sub research executor and advisor of color measurement

Ayaka Chiba: Sub research executor and advisor of research model

Kento Sato: Sub research executor and advisor of research model

Naoko Seki: Sub research executor and English proofreading

Keiichi Hosaka: Sub research executor and sub organizer of research model

Richard M Foxton: Sub research executor and English proofreading

Junji Tagami: Sub research executor and Integration

Masatoshi Nakajima: Corresponding Author and main organizer of research model

Funding

The work was supported by the Ministry of Education, Culture, Sports, Science and Technology of Japan (grant no.: 17K17125)

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Authors and Affiliations

  1. Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan

    Takashi Hatayama, Yukinori Kano, Asami Aida, Ayaka Chiba, Kento Sato, Keiichi Hosaka, Junji Tagami & Masatoshi Nakajima

  2. Dental Education Department, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan

    Naoko Seki

  3. Restorative Dentistry, Faculty of Dentistry, Oral and Craniofacial Sciences, King’s College London, London, UK

    Richard M. Foxton

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  1. Takashi Hatayama
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  2. Yukinori Kano
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  10. Masatoshi Nakajima
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Correspondence to Masatoshi Nakajima.

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Hatayama, T., Kano, Y., Aida, A. et al. The combined effect of light-illuminating direction and enamel rod orientation on color adjustment at the enamel borders of composite restorations. Clin Oral Invest 24, 2305–2313 (2020). https://doi.org/10.1007/s00784-019-03085-7

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  • DOI: https://doi.org/10.1007/s00784-019-03085-7

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