Abstract
Objetivo: avaliar clinicamente a utilização de dentifrício dessensibilizante, aplicado através de moldeira plástica, na redução da dor e variação de cor causadas pela técnica de clareamento dental de consultório. Material e Métodos: Para o estudo foram selecionados 24 voluntários que foram submetidos ao clareamento dental de consultório em 3 sessões clínicas com intervalo de uma semana, com a utilização de gel clareador (peróxido de hidrogênio - 35%). Na noite referente a cada sessão de clareamento, os voluntários utilizaram uma moldeira plástica por 4 horas contendo um dos dentifrícios relativos aos grupos experimentais: (1) Sucralose (S); (2) Fosfato de sódio (FS) e Silicato de cálcio (SC) (Tecnologia NR-5). A dor foi avaliada antes do uso da moldeira plástica com dentifrício (S1, S3, S5) e após (S2, S4, S6) durante 4 semanas, utilizando a escala numérica analógica com escores de 0 a 10. Para a variação de cor (?E) utilizou-se espectrofotômetro (Easyshade). Resultados: O grupo FS e SC apresentaram redução da dor em relação aos demais grupos (p<0,05). Houve uma redução da dor após o uso da moldeira com dentifrício (S2, S4, S6) por 4h e não houve diferença para ?E entre os grupos experimentais após o tratamento clareador (p=0,91). Conclusão: Conclui-se que a utilização de dentifrício dessensibilizante com FS e SC (Tecnologia NR-5) em moldeira plástica foi eficiente para a redução da dor causada por clareamento dental de consultório e o uso de dentifrício dessensibilizante não influenciou a eficácia do tratamento clareador.
Highlights
It was observed that the Regenerate (R) dentifrice was effective in reducing sensitivity when compared to the Control (C) group. This reduction in sensitivity is explained by the NR-5TM, which acts by recovering the chemical and structural composition of mineral composite of the tooth,[18,19,20,21] obliterating the dentinal tubules, and reducing the sensitivity caused by in-office bleaching
In other studies in which the colour variation was evaluated with the use of desensitizing dentifrices, Colgate Sensitive Pro-relief (Arginine and calcium carbonate) was mentioned, which could influence the diffusion of the bleaching gel, due to the its mechanism of action, which is similar to Regenerate (Sodium Phosphate and Calcium Silicate), both of which promote obliteration of dentinal tubules and modification of enamel permeability.[16,24]
This study showed an efficient alternative for the reduction of the sensitivity associated to the in-office dental bleaching treatment, with the use of a plastic custom tray
Summary
Among the limitations of dental whitening techniques, gingival irritation and dental sensitivity are the most frequently reported side effects during treatment, they are usually mild and transient.[2,4,5,6,7,8,9] these side effects may be more intense and even motivates patients to give up bleaching treatments.[10,11,12]. Among the most accepted explanations for dental sensitivity is the “hydrodynamic theory of Brännström”, which suggests that dental sensitivity would be caused by the movement of fluid in the dentinal tubules.[13] This fluid movement in the dentinal tubules would activate the nociceptors and result in the perception of pain.[2] In addition, the diffusion of hydrogen peroxide through the enamel and dentin to the pulp and the acid pH of the bleaching gel can cause transient pain sensitivity.[11,14,15]
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