Estudo <i>in vitro</i> da ação clareadora do peróxido de hidrogênio a 35%
Abstract
Este estudo avaliou, in vitro, a eficácia do peróxido de hidrogênio a 35% nos 3 terços dentários. Faces vestibulares de pré-molares de humanos, hígidos, escurecidos durante 96 h numa mistura de café, chá preto, bebida à base de cola, vinho e solução de tabaco, foram submetidos a dois clareamentos pelo gel de peróxido de hidrogênio a 35% com intervalo de 7 dias. A eficácia clareadora foi determinada através do espectrofotômetro Easyshade-Vita – sistema CIELab. Os parâmetros L*, a* e b* determinados, preliminarmente, revelaram os seguintes resultados: luminosidade alta (L*) e tonalidades tendendo ao verde (-a*) e ao amarelo (+b*); após a pigmentação, detectou-se redução da luminosidade (L*) e predominância das cores vermelho e amarelo para os parâmetros a* e b*; 7 dias após o 1º clareamento houve significativa melhoria dos valores de L* e a*, embora não tenha havido remoção integral da pigmentação; 7 dias após o 2º clareamento os três parâmetros retornaram aos valores próximos àqueles iniciais, sendo que o paramento b* foi o responsável pela eficácia clareadora. Para os valores de ΔE, foram encontradas as seguintes médias referentes aos terços cervical, médio e incisal: 6,04 ± 2,57; 5,22 ± 2,93 e 5,11 ± 1,71. Concluiu-se que: 1. houve expressiva remoção da pigmentação após os dois clareamentos; 2. a falta de uniformidade entre os terços após a primeira sessão, justificou a exigência de dois procedimentos clareadores, com intervalo de 7 dias, já que estes parâmetros têm comportamentos distintos; 3. os valores ΔE para cada terço apontaram alguma percepção visual, todavia os valores de L*, a* e b* comparados, isoladamente, não revelaram diferenças estatisticamente significantes.
UNITERMOS: clareamento dental; peróxido de hidrogênio; escurecimento.
SUMMARY
This study evaluated, in vitro, the efficacy of the peroxide of hydrogen to 35% in the 3 dental thirds. Faces initial pre-molars of humans, healthy, darkened during 96 h in a mixture of coffee, black tea, beverage to based on coke, wine and solution of tobacco, were submitted to two whitening by the hydrogen peroxide gel to 35% with break of 7 days. The efficacy whitener was determined through the spectrophotometer Easy shade-Vita – system CIELab. The parameters L*, to* and b* determined, preliminarily, revealed the following results: high brightness (L*) and keys tended to the green one (-a*) and to the yellow one (+b*); after pigmentation, detected itself reduction of the brightness (L*) and predominance of the yellow and red colors for the parameters a* and b*; 7 days after the 1º whitening had significant improvement of the values of L* and a*, although have not had integral removal of the pigmentation; 7 days after the 2º whitening the three parameters returned to the values near to those initial, being that the parameter b* was the responsible one by the efficacy whitener. For the values of ΔE, were found the following measure referring the thirds, cervical, middle and incisal: 6,04 ± 2,57; 5,22 ± 2,93 and 5,11 ± 1,71. Concluded that: 1. it had expressive removal of the pigmentation after the two whitening; 2. the absence of uniformity between the thirds after first session, justified the demand of two procedures whitener, with break of 7 days, since these parameters have distinct behaviors; 3. the values ΔE for each third had pointed some visual perception, however the values of L*, a* and b* compared, separately, did not reveal differences statistics significant.
UNITERMS: dental bleaching; hydrogen peroxide; discolored.
Downloads
Published
Issue
Section
License
COPYRIGHT
The submission of originals to Odonto Ciência implies the transfer by the authors of the right for publication. Authors retain copyright and grant the journal right of first publication. If the authors wish to include the same data into another publication, they must cite Odonto Ciência as the site of original publication.
CREATIVE COMMONS LICENSE
As this journal is open access, the articles are allowed free use in scientific and educational applications, with citation of the source.
According to the type of Creative Commons License (CC-BY 4.0) adopted by Odonto Ciência, the user must respect the requirements below.
You are free to:
Share — copy and redistribute the material in any medium or format.
Adapt — remix, transform, and build upon the material for any purpose, even commercially.
However, only under the following terms:
Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests Odonto Ciência endorses you or your use.
No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
Notices:
You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation.
No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.
For more details on the Creative Commons license, please follow the link in the footer of this website.