Delayed Light Activation Improves Color Stability of Dual-Cured Resin Cements.
J Prosthodont
; 27(5): 449-455, 2018 Jun.
Article
em En
| MEDLINE
| ID: mdl-27455118
ABSTRACT
PURPOSE:
To evaluate the color change caused by post-irradiation conversion (ΔE24h and ΔE8 days ) and artificial aging (ΔEAGING ) of resin cements light activated through ceramics of different opacities immediately and 6 minutes after manipulating the material. MATERIALS ANDMETHODS:
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 ΔE24h and ΔE8 days after 37ËC-dry-dark-storage for 24 hours and 8 days, and ΔEAGING after 60ËC-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 ΔEAGING , 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 ΔEAGING 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.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Cor
/
Cimentos de Resina
/
Cura Luminosa de Adesivos Dentários
Idioma:
En
Revista:
J Prosthodont
Assunto da revista:
ODONTOLOGIA
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Brasil