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148 rev port estomatol med dent cir maxilofac. 2021;62(3):141-149

Considering hydrogen peroxide’s kinetics and petroleum the regulations of the relevant clinical research ethics com-
jelly’s transparent semi-solid characteristics, the Vaseline pro- mittee and with those of the Code of Ethics of the World Med-
tection technique’s inferior effectiveness may be explained by ical Association (Declaration of Helsinki).

its isolation incapacity when HP is released into the crevicular Confidentiality of data. The authors declare that they have
fluid. 10,11,28 Additionally, due to petroleum jelly’s transparency,
Vaseline can be overlooked in the tooth’s vestibular surface, re- followed their work center protocols on access to patient data
and for its publication.
sulting in enamel areas where the bleaching varnish would have
less effectiveness. On the other hand, the characteristics of the Right to privacy and informed consent. The authors have
described block-out resin, which is made of light-curing meth- obtained the written informed consent of the patients or sub-
acrylate resin and adheres to the gingiva and tooth margins, may jects mentioned in the article. The corresponding author is in
allow better isolation capacity from the oral fluids with an eas- possession of this document.
17
ily distinguishable color. This reasoning may explain the re-
sults suggesting that the clinical protocol for the paint-on var-
nish Paint On Plus in-office technique could be optimized by Conflict of interest
modifying the soft-tissue protection material from Vaseline to a
block-out resin, increasing bleaching effectiveness. Although Bleaching materials supported by Ivoclar-Vivadent. The au-
block-out resins have been applied in several bleaching studies, thors do not have any financial interest in the companies
to the authors’ knowledge, the effect of the protection technique whose materials are included in this article.
itself has never been evaluated. 3,14,15,29,30 The rationale for using
Vaseline based on its lower treatment cost may not be justifiable
if better detectable results (ΔE of 0.9, which suggests a tooth orcid
00
color difference detected by more than 50% individuals) are
achievable using light-curing methacrylate resins. Ana Beatriz Cardoso 0000-0001-5825-5442
This study was performed in a university setting, involving Ruben Pereira 0000-0002-5596-8479
mostly younger patients with overall good oral hygiene and João Silveira 0000-0001-9366-0662
higher treatment compliance. However, in an older population Susana Dias 0000-0002-5956-7234
with darker colored teeth, the bleaching effects could probably António Mata 0000-0003-1474-2681
be even more noticeable since our results suggest an increase Duarte Marques 0000-0003-1966-8281
in color difference perception for teeth darker than VITA Clas-
sical A3.5.
The influence of different materials or techniques for prop- references
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