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J Dent Res Dent Clin Dent Prospects. 2021;15(1): 53-58.
doi: 10.34172/joddd.2021.010
  Abstract View: 64
  PDF Download: 93

Clinical Dentistry

Original Article

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

Lais Sampaio Souza 1 ORCID logo, Tais Rocha Donato 2 ORCID logo, Gabriela Alves Cerqueira 3 ORCID logo, Andrea Nobrega Cavalcanti 4 ORCID logo, Paula Mathias 4* ORCID logo

1 Private Practitioner, Bahia, Brazil
2 Institute of Health Science , Federal University of Bahia, Brazil
3 Department of Restorative Dentistry , Faculty of Dentistry, Status University of Campinas, Brazil
4 Department of Clinical Dentistry, Faculty of Dentistry, Federal University of Bahia, Brazil
*Corresponding Author: Paula Mathias, Email: pmathias@yahoo.com

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.

Keywords: Color, Composite resin, Post-curing
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Submitted: 04 Jun 2020
Accepted: 07 Dec 2020
ePublished: 13 Feb 2021
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