The impact of at home and in-office bleaching agents on the color stability of bulk-fill composite resins

Authors

  • Rodrigo Máximo Araújo São Paulo State University (Unesp) – Institute of Science and Technology, São José dos Campos – Department of Dental Materials and Prosthodontics – SP – Brazil. http://orcid.org/0000-0002-9084-0585
  • Elisangela Costa Lemes São Paulo State University (Unesp) – Institute of Science and Technology, São José dos Campos – SP – Brazil. http://orcid.org/0000-0002-8500-4048
  • Rubens Ferri Pachito São Paulo State University (Unesp) – Institute of Science and Technology, São José dos Campos – SP – Brazil. http://orcid.org/0000-0002-7365-2646
  • Fernanda Alves Feitosa São Paulo State University (Unesp) – Institute of Science and Technology, São José dos Campos – SP – Brazil. http://orcid.org/0000-0003-0648-5988

DOI:

https://doi.org/10.14295/bds.2019.v22i1.1675

Abstract

Objective: This study compared different composites for color stability after exposure to at home and in-office bleaching gels. Material and Methods: Composite resin specimens (6mm diameterx2mm thickness) were manufactured according to the following groups (n=20): RC- Conventional; BF-Bulk Fill; RF-Flow; BFF-Bulk-Fill Flow. The surfaces were stained with coffee solution for 36hrs. A spectrophotometer was used to record the initial color (L*a*b*). Half of the specimens from each group underwent bleaching with 35% hydrogen peroxide (in-office) in three 45-minute applications. New color measurements were performed after 7, 14 and 21 days. The other half of the specimens underwent bleaching with 22% carbamide peroxide (at home) in 14 1-hour applications. Further color measurements were performed after 7 and 14 hours. For comparison between the color coordinates in different periods, ANOVA for repeated measures was applied (?=5%). The color variation (?E) was calculated for each group. Results: For in-office bleaching, there were no significant differences between the periods b* coordinate of the RF group, and for L* and b* coordinates of the BFF group. For at home bleaching the groups BF and BFF showed no differences for the L* coordinate. For the other coordinates, there was difference between the initial periods and after 14 days. The ?E variation presented higher values for the at home bleaching groups. For both whiteners the bulk-fill resins presented the greatest color variations. Conclusions: Bulk Fill resins do not guarantee greater color stability than the other composite resins tested, including conventional flow resin. The conventional composite resin showed the lower ?E.

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Published

2019-01-31

Issue

Vol. 22 No. 1 (2019): Jan. - Mar. / 2019 - Published January 2019

Section

Clinical or Laboratorial Research

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