Soares DG, Sacono NT, Ribeiro APD, Leite ML, Duque CCDO, Gallinari MDO, Pacheco LE, Hebling J, Costa CADS. Pro-inflammatory mediators expression by pulp cells following tooth whitening on restored enamel surface.
Braz Dent J 2022;
33:83-90. [PMID:
35508040 PMCID:
PMC9645150 DOI:
10.1590/0103-6440202204688]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 01/07/2022] [Indexed: 12/05/2022] Open
Abstract
This paper aimed to assess the influence of adhesive restoration interface on the
diffusion of hydrogen peroxide (H2O2), indirect toxicity,
and pro-inflammatory mediators expression by odontoblast-like cells, after
in-office tooth whitening. Dental cavities prepared in bovine enamel/dentin
discs were adhesively restored and subjected or not to hydrolytic degradation
(HD). A whitening gel with 35% H2O2 (WG) was applied for
45 min onto restored and non-restored specimens adapted to artificial pulp
chambers giving rise to the groups: SD- intact discs (control); SD/HP- whitened
intact discs; RT/HP- restored and whitened discs; and RT/HD/HP- restored and
whitened discs subjected to HD. The extracts (culture medium + WG components
diffused through enamel/dentin/restoration interface) were collected and applied
to odontoblast-like MDPC-23 cells. The study evaluated the amount of
H2O2 in the extracts, as well as the cell viability
(CV), cell morphology (CM), and gene expression of inflammatory mediators (TNF-α
and COX-2) by the pulp cells exposed to the extracts (ANOVA and Tukey tests; 5%
significance). All whitened groups presented lower CV than SD (control;
p<0.05). The highest CV reduction and gene expression of TNF-α and COX-2 was
observed in the RT/HD/HP group in comparison with SD/HP and RT/HP (control;
p<0.05). CM alterations occurred in all whitened groups. The intensity of
these cell side effects was directly related with the amount of
H2O2 in the extracts. We concluded that adhesive
restoration of dental cavity increases the H2O2 diffusion
after in-office whitening, enhancing the indirect toxicity of this therapy and
trigger pro-inflammatory overexpression by MDPC-23 cells.
Collapse