Color stability of an artificially aged nanofilled composite resin post-cured with different techniques

Souza, Lais Sampaio and Donato, Tais Rocha and Cerqueira, Gabriela Alves and Cavalcanti, Andrea Nobrega and Mathias, Paula (2021) Color stability of an artificially aged nanofilled composite resin post-cured with different techniques. Journal of Dental Research, Dental Clinics, Dental Prospects, 15 (1). pp. 53-58. ISSN 2008-210X

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Abstract

Background. Post-cured composite resins exhibit improvements in physical and mechanical properties due to additional polymerization conversion. However, the post-curing techniques might influence the color stability of composite resin materials. Thus, this study evaluated the color stability of a nanofilled composite resin (Filtek Z350 XT - 3M ESPE) subjected to different post-curing techniques.

Methods. Sixty samples (color A2) were randomly allocated to six experimental groups (n=10): G1: photoactivation (P) (control); G2: P + microwave oven with distilled water; G3: P + microwave oven without distilled water; G4: P + conventional oven; G5: P + dry-heat sterilizer; G6: P + steam autoclave. All the groups were stored in distilled water for 60 days and immersed daily in 5 mL of a coffee solution for 3 minutes. The color readings (CIEL*a*b* system) were performed at two different time intervals, initially and after 60 days, in a reflectance spectrophotometer (UV-2600; Shimadzu). The colorimetric readings were performed using the Color Analysis software (CIEL*a*b* system).

Results. Group G6 exhibited significantly low values of total color change (ΔE=13.16). The control (ΔE=15.32) and G5 (ΔE=15.49) groups exhibited intermediate values, with no difference between them. In turn, the groups in which the resin was heated in a microwave (G2 ΔE=18.55 and G3 ΔE=19.45) exhibited the most significant color changes (one-way ANOVA and Tukey test, P≤0.05).

Conclusion. Steam autoclave post-polymerization increased the color stability of the nanofilled resin subjected to artificial aging and coffee immersion.

Item Type: Article
Subjects: Afro Asian Archive > Medical Science
Depositing User: Unnamed user with email support@afroasianarchive.com
Date Deposited: 24 May 2023 06:54
Last Modified: 13 Sep 2024 07:52
URI: http://info.stmdigitallibrary.com/id/eprint/843

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