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Effect of thickness on color appearance of multilayer CAD/CAM composite resin blocks

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Abstract

The aim of this study was to evaluate the effect of thickness on the color appearance and translucency parameter (TP) of multilayer CAD/CAM composite resin blocks. Four brands of A3-shade multilayer CAD/CAM composite resin blocks were examined (Katana Avencia, CERASMART Multi, KZR-CAD HR Block 4 E-va, and Block HC Hard AN). Six specimens of five thicknesses were prepared for each brand, yielding 120 specimens in total. CIEL*a*b* values were determined using a spectrophotometer against black and white backgrounds, and the TP was calculated. The color differences (ΔE00) between layers (cervical/middle/incisal) and brands for each thickness against the black background were calculated using the CIEDE2000 system. As a result, on the black background, L* of the incisal layer was greater while a* and b* were smaller than those of the cervical layer for all brands. The ΔE00 values between the cervical and middle layers (1.23–3.27) were smaller than those between the cervical and incisal layers (3.98–5.67) and those between the middle and incisal layers (3.14–5.92). TP decreased with increasing block thickness. Some TP differences between layers were significant, but they were less than 2.75. In conclusion, the color appearance of CAD/CAM blocks was significantly influenced by both the thickness and layer. L*a*b* decreased with thickness, and a negative exponential relationship between TP and thickness was observed for all layers and brands.

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Authors and Affiliations

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

    Roubing Ha & Yumi Tsuchida

  2. Department of Oral Prosthetic Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan

    Maho Shiozawa

  3. Course for Oral Engineering, Faculty of Dentistry, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan

    Hidekazu Takahashi

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  1. Roubing Ha
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Correspondence to Hidekazu Takahashi.

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Ha, R., Tsuchida, Y., Shiozawa, M. et al. Effect of thickness on color appearance of multilayer CAD/CAM composite resin blocks. Odontology 110, 664–672 (2022). https://doi.org/10.1007/s10266-022-00701-z

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  • DOI: https://doi.org/10.1007/s10266-022-00701-z

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