Browsing by Author "Yago, Ryotaro"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Evaluation of Shade Integration of a Novel Universal-Shade Flowable Bulk-Filling Resin Composite
    (MDPI, 2024-12-04) Kaneko, Hirofumi; Kawamoto, Chiharu; Toida, Yu; Yago, Ryotaro; Wu, Di; Yuan, Yuan; Chen, Fei; Yamauti, Monica; Sano, Hidehiko; Tomokiyo, Atsushi; Biomedical and Applied Sciences, School of Dentistry
    Background: This study aimed to evaluate the color-matching and light transmission properties of a newly developed aesthetic flowable resin composite, OCFB-001. Methods: Rubber molds containing cylindrical cavities were filled with Estelite Sigma Quick, and 40 resin composite (CR) molds with simulated Class I cavities were prepared in shades A1, A2, A3, and A4, resulting in a total of 160 samples. Following bonding procedures, four different flowable resin composites (n = 10) were introduced into the cavities. The color difference (ΔE00) was calculated using two methods. A two-way analysis of variance was performed, and the interaction was significant, so a post hoc analysis was performed for each shade using Bonferroni's correction. The morphology of the filler in each material was observed via scanning electron microscopy (SEM). Results: In the A1 shade, OCFB-001 demonstrated color differences comparable to those of other materials. However, in the A2, A3, and A4 shades, OCFB-001 exhibited significantly lower color differences (ΔE00) than the other materials, with a more consistent distribution. SEM analysis revealed that the OCFB-001 structure resembled that of Estelite Bulk Fill Flowable. Conclusions: OCFB-001 showed excellent shade matching in the A2, A3, and A4 ranges and good matching in the A1 shade, on par with existing universal-shade flowable bulk-fill resin composites.
  • Thumbnail Image
    Item
    Visibility of Recurrent Caries Through Universal Shade Resin Composite Restorations
    (MDPI, 2024-11-27) Yago, Ryotaro; Kawamoto, Chiharu; Wu, Di; Mirokuin, Takuma; Islam, Rafiqul; Yamauti, Monica; Sano, Hidehiko; Tomokiyo, Atsushi; Biomedical and Applied Sciences, School of Dentistry
    This in vitro study aimed to investigate whether color differences in the stained cavity floor simulating recurrent caries can be detected using various restored resin composites. Artificial teeth were made with conventional resin composite (Estellite Sigma Quick A3; ET), and class V cavities were prepared. To simulate the color of caries, a dot was marked in the center of the cavity floor using four different magic pens. The cavities were filled with ET and two universal shade resin composites (UC, Omnichroma; OMI, Essentia Universal; ESS). For photographic analysis, a standard correction color chart was used. The color difference (ΔE00) between (i) the lab value at the center of the cavity and (ii) the average lab value at 1 mm mesial and distal to the center of the cavity was calculated. The data were statistically746o-way ANOVA (p < 0.05). For visual analysis, 25 dentists were asked to complete a questionnaire to determine whether the color differences were noticeable. In the photographic analysis, UC showed larger ΔE00 values than ET in all colors. Visual analysis revealed higher detection rates for UC than ET. Universal shade resin composite tends to reflect the color of the cavity more effectively than conventional resin composite.