In vitro evaluation of the microhardness of bovine enamel exposed to acid solutions after bleaching

Zanet, Caio Gorgulho; Fava, Marcelo; Alves, Levy Anderson César

doi:10.1590/s1806-83242011000600015

Cited by 19 publications

(21 citation statements)

References 20 publications

(27 reference statements)

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“…20 The results of this investigation showed that the dental fragments submitted to bleaching combined with red wine (%SMH red 94.46) and with cola soft drink (%SMH red 92.96) showed higher mineral loss compared to the other groups (Table 1). Higher enamel microhardness values were reported for unbleached teeth compared to the bleached teeth similar to other studies, 7,11 and these were more susceptible to demineralization after contact with acid substances. 7 Thus, the first null hypothesis was rejected.…”

Section: Discussionsupporting

confidence: 87%

“…2 However, even when obtaining satisfactory clinical results, 3,4 some clinicians have still expressed concerns about the effects of carbamide peroxide bleaching on the oral tissues, which have motivated studies to evaluate the possible adverse effects produced during and after the whitening procedures. [5][6][7] Scientific evidence has shown that enamel can show changes in its structure when exposed to carbamide peroxide affecting its composition and its morphology [8][9][10] and causing surface changes while decreasing the tooth's hardness. 1,11 Greater changes on the enamel surface are observed with the use of acid bleaching products.…”

Section: Introductionmentioning

confidence: 99%

“…7,12,15,16 Regarding the environmental storage, most studies have used artificial saliva to store the specimens between one treatment and another, aiming to simulate clinical situations. [15][16][17] To eliminate the subjective interpretation of the visual color comparison, spectrophotometers and colorimeters are used to measure color change in the tooth.…”

Section: Introductionmentioning

confidence: 99%

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Mineral loss and color change of enamel after bleaching and staining solutions combination

et al. 2013

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Abstract. Pigments of food and beverages could affect dental bleaching efficacy. The aim of this investigation was to evaluate color change and mineral loss of tooth enamel as well as the influence of staining solutions normally used by adolescent patients undergoing home bleaching. Initial hardness and baseline color were measured on enamel blocks. Specimens were divided into five groups (n ¼ 5): G1 (control) specimens were kept in artificial saliva throughout the experiment (3 weeks); G2 enamel was exposed to 10% carbamide peroxide for 6 h daily, and after this period, the teeth were cleaned and stored in artificial saliva until the next bleaching session; and G3, G4, and G5 received the same treatments as G2, but after bleaching, they were stored for 1 h in cola soft drink, melted chocolate, or red wine, respectively. Mineral loss was obtained by the percentage of hardness reduction, and color change was determined by the difference between the data obtained before and after treatments. Data were subjected to analysis of variance and Fisher's test (α ¼ 0.05). G3 and G5 showed higher mineral loss (92.96 AE 5.50 and 94.46 AE 1.00, respectively) compared to the other groups (p ≤ 0.05). G5 showed high-color change (9.34 AE 2.90), whereas G1 presented lower color change (2.22 AE 0.44) (p ≤ 0.05). Acidic drinks cause mineral loss of the enamel, which could modify the surface and reduce staining resistance after bleaching.

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mineral loss and color change of enamel after bleaching and staining solutions combination

et al. 2013

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“…This fact may explain the results obtained with regard to pigmentation, since surface roughness and nonuniform geometry can influence the results (CÔRTES et al, 2013). Furthemore, some studies have reported that the acidic pH of pigment solutions promotes a loss of mineral in tooth structure, favoring the penetration of these solutions into the demineralized structure (MESQUITA-GUIMARÃES et al, 2015. ZANET et al, 2011, and others containing ethanol or pigments (BERGER et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Influence of solutions with pigmentation potential on tooth color after bleaching using 22% carbamide peroxide

Correia¹,

Melo²,

Cedraz³

et al. 2017

Biosci. J.

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ABSTRACT:The color stability achieved by dental bleaching can be affected by exposure to staining agents present in foods. However, there is scarce research regarding tooth staining during dental bleaching. This study investigated the effect of pigments on the color stability of dental elements during dental bleaching. Blocks obtained from bovine incisors were divided into seven groups (n = 10) in accordance with the staining pigments (distilled water -control; coffee, cola, tea, red wine, chocolate milk and soya sauce (Shoyu). The color was evaluated with a spectrophotometer (Minolta CR-321, Japan) before and after dental bleaching (1 st and 14 th days), employing the (CIE) L*a*b* system. The dental bleaching procedure was performed using 22% carbamide peroxide gel applied to the sample surface for a period of 1 hour each day, for 14 days. After dental bleaching, the teeth were exposed to 20 ml of staining solution for 5 minutes, at 37ºC and 100 rpm for different periods. During the experiment, the samples were stored in distilled water. Data was analyzed using ANOVA followed by Tukey tests, with a significance level of 5%. Significant differences for ∆E* values (p<0.05) were observed between the groups. The Shoyu group presented a decrease in luminosity (negative value of ∆L*). It could be concluded that all solutions contained pigments that promoted staining on the surface. However, bleached enamel was susceptible to staining with soya sauce (Shoyu), while other substances did not interfere with the dental bleaching.

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“…No presente estudo, foi utilizada água destilada, mas, em outras pesquisas, já foram utilizadas solução remineralizante, saliva artificial e saliva humana 12,24 . O meio de armazenagem é muito importante, porque alguns estudos verificaram que a saliva é um contribuinte essencial na recuperação do conteúdo mineral 11,[25][26][27] .…”

Section: Discussionunclassified

Efeito do uso de agentes clareadores com cálcio na microdureza do esmalte dental

Gruber

Colli

Muniz

et al. 2018

Rev. da Fac. de Odontologia, UPF

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IntroduçãoAo longo das últimas décadas, há uma busca crescente por melhores condições estéticas e tratamentos clareadores, que se mostram eficazes, seguros e com bons resultados 1 . O clareamento dental é a técnica menos invasiva e mais conservadora, porém pode apresentar algumas desvantagens, como sensibilidade, ulcerações nos tecidos moles e, por vezes, toxicidade 2 . Portanto, o profissional deve ter experiência com o mecanismo de ação e conhecimento da segurança biológica dos agentes clareadores, para poder indicá-los de forma correta e orientar seus pacientes sobre o tratamento. Existem várias técni-cas de clareamento, como o clareamento caseiro com moldeira individual, o clareamento em consultório e o clareamento combinado, que associa as técnicas de consultório e caseira. As indicações e os tipos de clareamento estão relacionados às alterações de cor, que podem ser causadas por fatores extrínsecos ou intrínsecos 3,4 , e às características do paciente.Entretanto, estudos mostram que o peróxido de hidrogênio é um agente oxidante com alta capacidade de penetração no esmalte e na dentina devido ao seu baixo peso molecular 2 e, dependendo da técnica empregada, da quantidade de sessões, do tempo de exposição e da concentração do agente clareador, pode acarretar efeitos indesejáveis, como a sensibilidade e a alteração da morfologia do esmalte [5][6][7][8][9] . A literatura sugere que o uso indiscriminado dos

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In vitro evaluation of the microhardness of bovine enamel exposed to acid solutions after bleaching

Cited by 19 publications

References 20 publications

Mineral loss and color change of enamel after bleaching and staining solutions combination

Mineral loss and color change of enamel after bleaching and staining solutions combination

Influence of solutions with pigmentation potential on tooth color after bleaching using 22% carbamide peroxide

Efeito do uso de agentes clareadores com cálcio na microdureza do esmalte dental

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