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Delayed Light Activation Improves Color Stability of Dual‐Cured Resin Cements
Author(s) -
Furuse Adilson Y.,
Santana Lino Oliveira Carvalho,
Rizzante Fabio Antonio Piola,
Ishikiriama Sérgio Kiyoshi,
Bombonatti Juliana Fraga,
Correr Gisele Maria,
Gonzaga Carla Castiglia
Publication year - 2018
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/jopr.12509
Subject(s) - accelerated aging , ceramic , irradiation , nuclear chemistry , materials science , chemistry , dentistry , composite material , medicine , physics , nuclear physics
Purpose To evaluate the color change caused by post‐irradiation conversion (ΔE 24h and ΔE 8 days ) and artificial aging (ΔE AGING ) of resin cements light activated through ceramics of different opacities immediately and 6 minutes after manipulating the material. Materials and Methods Resin cement disks (Allcem and LuxaCore) were light activated through ceramics (without ceramic, e.max HT, LT, and MO) immediately and 6 minutes after the manipulation (n = 10). Spectrophotometry was used to evaluate ΔE 24h and ΔE 8 days after 37˚C‐dry‐dark‐storage for 24 hours and 8 days, and ΔE AGING after 60˚C‐water‐storage for 24 hours. Data were analyzed with three‐way ANOVA and Tukey's HSD (α = 0.05). Results Regarding the post‐irradiation color change, significant differences were found between the cements ( p < 0.0001), light activation protocols ( p = 0.037), and ceramics ( p < 0.001). The immediate activation (16.2 ± 0.1) showed lower ΔE values than the delayed activation (16.5 ± 0.1). Ceramics influenced the ΔE values as follows: MO (14.0 ± 1.2) < LT (14.9 ± 1.2) ≈ HT (15.4 ± 1.2) < control (21.2 ± 1.2). Regarding ΔE AGING , significant differences were found between cements ( p < 0.001), light activation ( p = 0.006), and ceramics ( p < 0.001). The delayed activation (8.4 ± 0.1) showed lower values than the immediate activation (8.9 ± 0.1). Ceramic spacers influenced ΔE AGING as follows: control (5.6 ± 0.2) < MO (6.6 ± 0.2) < HT (11.0 ± 0.2) ≈ LT (11.5 ± 0.2). Conclusion The delayed light activation resulted in increased color stability, while the ceramic interposition resulted in lower color stability.