Avaliação in vitro do conteúdo mineral do esmalte submetido ao clareamento com peróxido de hidrogênio 10% associado a abrasão com diferentes dentifrícios

Abstract

Resumo: Atualmente, ha uma busca crescente por tratamentos que modifiquem ou alterem a coloracao dos dentes. Nesse sentido, muitos pacientes associam, sem a orientacao e supervisao do cirurgiao-dentista, dentifricios com propriedades clareadoras ao tratamento clareador supervisionado com peroxido de hidrogenio, o que pode causar a perda mineral do esmalte dental impactando negativamente o resultado. O objetivo do presente estudo foi avaliar, in vitro, a perda de calcio e fosforo do esmalte bovino quando ha o uso concomitante do peroxido de hidrogenio a 10% e dentifricios clareadores. Para isso, a partir de coroas de dentes bovinos foram confeccionadas 112 amostras circulares (n=14) com diametro de 4 mm e em seguida foram embutidas em resina acrilica transparente. Apos o polimento com lixas decrescente de granulacao em politriz sob irrigacao, as amostras foram divididas em oito grupos de acordo com o tratamento clareador (OpGo - peroxido de hidrogenio 10% ou AT ¡V agua tamponada) e dentifricios (OMW ¡V Oral-B Mineral White; CLW ¡V Colgate Luminous White Advance; STW ¡V Sensodyne True White; CT ¡V Colgate Total 12). O tratamento das amostras teve duracao de 10 dias, sendo aplicacao do gel ou agua tamponada por 30 min diarios, e abrasao com uma escova eletrica (2x/dia, 120 s: 15 s de abrasao). Nos intervalos, as amostras ficaram imersas em saliva artificial. Apos o periodo de remineralizacao, a analise dos componentes minerais calcio (Ca) e fosforo (P) das amostras foram realizadas no ƒÝEDX. Em cada corpo de prova foram coletados 3 pontos na superficie do esmalte com uma tensao de 15Kv, corrente de 100ƒÝA, leitura de 100 segundos com dead time 25%. Os dados absolutos foram submetidos ao teste de analise de variancia de dois fatores com medidas repetidas (RM-ANOVA dois fatores) com significancia de 5%, o qual nao revelou diferenca entre os dentifricios estudados em termos de perda de Ca e P (p>0,05). Assim, o uso concomitante do gel clareador caseiro com os diferentes dentifricios testados nesse estudo nao causou perda mineral significativa do esmalte dentario, quando esse gel e utilizado dentro das recomendacoes do fabricante.

Abstract: Nowadays, there is a growing search for whitening treatments that modify or modify the teeth color. In this way, many patients associate, without the guidance and supervision of the dental surgeon, dentifrices with whitening properties to the supervised whitening treatment with hydrogen peroxide, this association can cause mineral loss of the dental enamel resulting in problems for the health of the teeth, such as dentin hypersensitivity, decreased hardness and increased superficial enamel roughness. The aim of the present study was to evaluate, in vitro, the loss of calcium and phosphorus of bovine enamel when there is the concomitant use of 10% hydrogen peroxide and whitening dentifrices. For this purpose, from bovine teeth crowns 112 circular samples (n = 14) with a diameter of 4 mm were made and then embedded in transparent acrylic resin. After polishing with decreasing granulation sandpaper in a polishing machine under irrigation, the samples were divided into eight groups according to the bleaching treatment (OpGo - 10% hydrogen peroxide or AT - buffered water) and dentifrices (OMW - Oral-b Mineral White ; CLW - Colgate Luminous White Advance; STW - Sensodyne True White; CT - Colgate Total 12). The treatment of the samples lasted 10 days, with application of the gel or buffered water for 30 min daily, and abrasion with an electric brush (2x / day, 120 s: 15 s of abrasion). In the intervals, the samples were immersed in artificial saliva. After the remineralization period, the analysis of the mineral components calcium (Ca) and phosphorus (P) of the samples were performed on the ƒÝEDX. In each specimen, 3 points were collected on the enamel surface with a voltage of 15Kv, current of 100 £gA, reading of 100 seconds with dead time 25%. The absolute data were subjected to the two-factor analysis of variance test with repeated measures (two-way RM-ANOVA) with a significance of 5%, which did not reveal any difference between the studied toothpastes in terms of loss of Ca and P (p> 0.05). Thus, the concomitant use of homemade bleaching gel with the different toothpastes tested in this study did not cause significant mineral loss of tooth enamel, when this gel is used within the manufacturer's recommendations.