Evaluation of Physical Properties of a Nanocomposite after Aging,                     Bleaching and Staining

Gouveia, Thayla Hellen Nunes; Públio, Juliana C.; Ambrosano, Gláucia María Bovi; Paulillo, Luís Alexandre Maffei Sartini; Aguiar, Flávio Henrique Baggio; Lima, Débora Alves Nunes Leite

doi:10.5301/jabfm.5000294

Cited by 5 publications

(11 citation statements)

References 36 publications

(45 reference statements)

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“…Natrosol (hidroxietilcelulose) is a cellulose-based polymer and differs from carbopol mainly due to its nonionic nature. [ 7 ] In addition, natrosol can be associated to acidic substances in whitening gels, due to its remarkable stability to pH variation (2.0–12.0). Carbopol, in turn, a thickener commonly used in at-home bleaching gels,[ 7 ] is a carboxypolymethylene polymer, ionic and acidic in nature, being a carboxylic acid derivative.…”

Section: Discussionmentioning

confidence: 99%

“…[ 7 ] In addition, natrosol can be associated to acidic substances in whitening gels, due to its remarkable stability to pH variation (2.0–12.0). Carbopol, in turn, a thickener commonly used in at-home bleaching gels,[ 7 ] is a carboxypolymethylene polymer, ionic and acidic in nature, being a carboxylic acid derivative. Due to its strong calcium-binding ability,[ 8 ] it has been reported that carbopol can reduce enamel microhardness and dentin since it causes inhibition of hydroxyapatite crystal incorporation.…”

Section: Discussionmentioning

confidence: 99%

“…[ 2 ] In this context, the present study evaluates currently marketed thickeners in bleaching gels in comparison to natrosol. Natrosol has the advantages of being nonionic thickener and having a wide-range pH stability (2.0–12.0),[ 7 ] which means it can be combined to acidic substances such as bleaching formulations.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of home bleaching gel modified by different thickeners on the physical properties of enamel: An in situ study

et al. 2018

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Objective:This in situ study evaluated the influence of 10% carbamide peroxide (CP) in combination with different thickeners on physical characteristics of enamel.Materials and Methods:Eighty-four bovine blocks of enamel and dentin (4 mm × 4 mm × 2.5 mm) were divided into seven groups (n = 12), fixed in palatal intraoral devices, and submitted to different treatments: CP + carbopol (FGM), CP + carbopol + glycerin (ultradent), CP + natrosol (experimental gel), carbopol, carbopol + glycerin, and natrosol, without treatment (control group). The physical properties tested were color (ΔE), roughness (Ra), and Knoop microhardness (KHN).Statistical Analysis Used:Data were submitted to ANOVA, Tukey's, and Dunnett's tests (α = 0.05). Results: all groups presented significant color variation, except carbopol. For microhardness, all bleached groups did not differ from control. Roughness increased in all bleached groups when compared to the control group, but CP + natrosol presented statistical lower results than CP + carbopol.Conclusion:Replacement of carbopol by natrosol caused less change on roughness surface, at the same time yielding an effective whitening result.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Evaluation of home bleaching gel modified by different thickeners on the physical properties of enamel: An in situ study

et al. 2018

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“…Although remineralization actions are not expected in the composite resin, the purpose of using RS was to simulate the oral environment. 27 …”

Section: Brushing Protocolmentioning

confidence: 99%

Characterization of whitening toothpastes and their effect on the physical properties of bulk-fill composites

et al. 2023

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Objective To characterize activated charcoal and 2% hydrogen peroxide-based toothpastes and investigate their effects on roughness, color change, and gloss of bulk-fill composite resin. Methodology Composite resin specimens (Aura Bulk Fill, SDI) were subjected to 5,000 brushing cycles with regular toothpaste (Colgate Total 12, [RT]), activated charcoal toothpaste (Bianco Dental Carbon, [AC]), or hydrogen peroxide-containing toothpaste (Colgate Luminous White Advanced, [HP]), with or without coffee exposure. The pH, particle characterization by scanning electron microscopy (SEM), and weight% of solid particles in the toothpaste were assessed. Roughness (Ra) was evaluated using a surface profile-measuring device, color change (∆E ab /∆E 00 ) by reflectance spectrophotometer, and gloss unit (GU) by glossmeter. Kruskal–Wallis, Dunn, Friedman, and Nemenyi tests were used, and the correlation coefficient test was performed between Ra and GU (α=0.05). Results RT presented a higher Ra after brushing and did not change after staining with coffee; moreover, the ∆E ab /∆E 00 values were higher for RT than HP. Regarding gloss, AC and HP obtained higher values compared to RT. A significant negative correlation between gloss and Ra was found for RT exposed to coffee. All toothpastes had a neutral pH; however, RT had the largest percentage of solids by weight. SEM images showed particles of many sizes: irregular shape (RT), more regular particles (AC), and spherical clusters (HP). Although surface roughness, color change, and gloss may compromise the longevity of restorations, the whitening toothpastes tested did not promote more morphology changes than regular toothpastes.

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“…Among the adverse effects reported, the following are noteworthy: I) increased permeability and changes in the roughness and topography of the enamel (Camargo et al, 2007;Hosoya et al, 2003;Llena, Esteve, Forner, 2017;Markovic et al, 2007;Vieira-Junior et al, 2018); II) decrease surface and cross-sectional microhardness (Al-Salehi, Wood, Hatton, 2007;Berger et al, 2010;Cavalli et al, 2018); III) surface changes visualized in a Scanning Electron Microscopy (D'Amario et al, 2012;Grazioli et al, 2018;Vieira-Junior et al, 2018); IV) dissolution of calcium, phosphorus, and fluorine of the dental hydroxyapatite crystal for the whitening gel (Al-Salehi, Wood, Hatton, 2007;Cavalli et al, 2018;Vieira-Junior et al, 2018); V) changes in properties of resin-based restorative materials (Gouveia et al, 2016;Gouveia et al, 2006;Telang et al, 2018); VI) alteration in the bond strength of dental substrates by restorative materials (Lima et al, 2011;Miranda et al, 2013).…”

Section: Undesirable Effects Of Conventional Bleachingmentioning

confidence: 99%

Current status of whitening agents and enzymes in Dentistry

Pauli

Kanemaru

Vieira-Júnior

et al. 2022

Braz. J. Pharm. Sci.

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This study reviews the knowledge on the use of conventional dental whitening and the use of enzymes as a new approach in bleaching. A review of the literature was based on academic articles and on patents related to the use of enzymes in dental bleaching. Tooth whitening techniques used nowadays are well reported in the literature, and its mechanism of action consists of an oxidoreduction reaction with the release of free radicals. The great instability of radicals, when in contact with the tissues, promotes oxidation and reduction in the size of the pigment chains incorporated into them. These pigments are eventually broken down into smaller and smaller molecular chains and end up being diffused from the dental structure. In turn, the use of enzymes aimed at tooth whitening can be a less harmful alternative to the tooth because their specificity regarding the substrate makes them of great interest to perform specific reactions, reducing collateral effects. The use of proteolytic enzymes and oxidoreductases paired with the application of peroxides, can be a promising alternative for obtaining even better results in the dental bleaching process.

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Evaluation of Physical Properties of a Nanocomposite after Aging, Bleaching and Staining

Abstract: The bleaching reduced the microhardness of the nanocomposite, whereas the aging process changed all the properties studied. The bleaching favored extrinsic staining of the with aging nanocomposite.

Cited by 5 publications

References 36 publications

Evaluation of home bleaching gel modified by different thickeners on the physical properties of enamel: An in situ study

Evaluation of home bleaching gel modified by different thickeners on the physical properties of enamel: An in situ study

Characterization of whitening toothpastes and their effect on the physical properties of bulk-fill composites

Current status of whitening agents and enzymes in Dentistry

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