The effect of 24h non-stop hydrogen peroxide concentration on bovine enamel and dentine mineral content and microhardness

Al-Salehi, Samira K; Wood, David; Hatton, Paul V.

doi:10.1016/j.jdent.2007.08.001

Cited by 106 publications

(104 citation statements)

References 23 publications

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“…The computer can generate a 3-D picture of a sample by assembling a stack of these 2-D images from successive focal planes. Used in erosion studies, CLSM provides histotomographic images allow-ing for qualitative assessment and interpretation of hard tissue destruction or mineral dissolution, since light reflection and light scattering of hard tissue samples are influenced by micro-histological changes within a tooth sample [99][100][101] [76][77][78]. Since these images provide only limited information about the exact degree of demineralization, CLSM is mostly combined with other methods (e.g.…”

Section: Confocal Laser Scanning Microscopymentioning

confidence: 99%

Methods for Assessment of Dental Erosion

Attin

Wegehaupt²

2014

Monographs in Oral Science

126

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Various assessment techniques have been applied to evaluate the loss of dental hard tissue and the surface-softened zone in enamel induced by erosive challenges. In this chapter, the most frequently adopted techniques for analyzing the erosively altered dental hard tissues are reviewed, such as profilometry, measuring microscope techniques, microradiography, scanning electron microscopy, atom force microscopy, nano-and microhardness tests and iodide permeability test. Moreover, methods for chemical analysis of minerals dissolved from dental hard tissue are discussed. It becomes evident that the complex nature of erosive mineral loss and dissolution might not be comprehended by a single technique, but needs application of different approaches for full understanding. Chapter 10Lussi A (ed): Dental Erosion. Monogr Oral Sci. Basel, Karger, 2006, vol 20, pp 152-172 Methods for Assessment of Dental Erosion Thomas Attin, Florian Just WegehauptCenter for Dental Medicine, Clinic for Preventive Dentistry, Periodontology and Cariology, University of Zurich, Zürich, Switzerland AbstractVarious assessment techniques have been applied to evaluate the loss of dental hard tissue and the surface-softened zone in enamel induced by erosive challenges. In this chapter, the most frequently adopted techniques for analyzing the erosively altered dental hard tissues are reviewed, such as profilometry, microradiography, scanning electron microscopy, atom force microscopy, nano-and microhardness tests and iodide permeability test. Moreover, methods for chemical analysis of minerals dissolved from dental hard tissue are discussed. It becomes evident that the complex nature of erosive mineral loss and dissolution might not be comprehended by a single technique, but needs application of different approaches for full understanding. Copyright © 2006 S. Karger AG, Basel Acid attack leads to an irreversible loss of the outermost enamel and dentin layers and to partial demineralization (softening) of the tooth surface. In enamel, the thickness of the softened layer is estimated to be 2-5 tJm [1,2] [1, 2]. The softened eroded tooth surface is highly susceptible to abrasive wear, and mechanical impacts such as toothbrushing can easily remove the superficially demineralized dental hard tissue [3][4][5] [3][4][5]. For simulating intra-oral erosion as closely as possible, it is desirable to assess the erosive effects on native tooth surfaces. Most of the methods described below need polished surfaces for precise assessment of the erosively induced defects or for creating reference surfaces, which means that the natural, often fluoridated surface of the tooth has to be removed. However, it should be considered that in the case of intra-oral erosion the outermost surface layers are also continuously removed by the acid attack, so that a 'polished' surface is Attin 2 cre-ated. When monitoring of erosive surface alterations within a period of time is performed, it could become necessary to fix a specimen in the measuring device i...

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Section: Confocal Laser Scanning Microscopymentioning

confidence: 99%

Methods for Assessment of Dental Erosion

Attin

Wegehaupt²

2014

Monographs in Oral Science

126

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“…If nitrate penetrate these channels, oxygen may penetrate more readily due to its atomic weight (seven times less than silver nitrate) 8 . Probably, mineral loss may be detected after bleaching procedures [9][10] and this has been pointed as the cause of microhardness decrease [11][12] . It likely that one of the causes of these adverse effects are the free oxygen radicals released during the reaction, which do not act in a specific way and may act on the organic matrix of dental structures 13 , breaking up the lipids and proteins of dental tissues 14 .…”

Section: Introductionmentioning

confidence: 99%

“…Also characteristic of these changes are decreases in calcium and phosphate matrices 9,16 . These changes are detrimental to dental health because along with this process, there is an increased susceptibility to caries formation due to the ease of plaque adherence on the previously demineralized structure 10,17 . Fluoride has proven to be effective in promoting remineralization and inhibiting enamel demineralization 8 .…”

Section: Introductionmentioning

confidence: 99%

“…Several factors such as concentration 10 , application time 23 and pH 24 of the bleaching agent may predict the influence of these substances on dental structures. According to Bistey et al Table 2 -Table 2 -Table 2 -Table 2 -Table 2 -Mean values (µm) and standard deviations of initial (IR) and final roughness (FR) for each experimental group* showed a proportional relationship between mineral loss and bleaching agent concentration, pointing out that bleaching agents based on 35-38% hydrogen peroxide showed significantly higher values of calcium loss compared to athome gels (10% carbamide peroxide).…”

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Effect of bleaching agents containing fluoride or calcium on enamel microhardness, roughness and permeability

Rauen¹,

Filho²,

Bittencourt³

et al. 2015

Braz. J. Oral Sci.

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Aim: To evaluate the effect of different in-office bleaching agents on the permeability, roughness and surface microhardness of human enamel. Methods: For evaluation of roughness and microhardness, 40 hemi-faces of 20 premolars were subjected to initial roughness (Ra parameter) and microhardness (VHN) measurements. Thirty-two premolar's crowns were used for permeability test. Then, all specimens were randomly divided into four groups: C -without bleaching (control), HP35 -bleaching with 35% hydrogen peroxide (HP), HPF38 -38% HP+fluoride, HPC35 -35% HP+calcium. Final roughness (FR) and microhardness (FM) measurements were evaluated. For permeability, the 32 crowns were immersed in 1% sodium hypochlorite (20 min) and silver nitrate solutions (2 h) and subjected to developing solution under fluorescent light (16 h). Three sections from the crowns were analyzed in light microscope (100x) to evaluate the scores of permeability: Score 0 -no tracer agent penetration; Score 1 -less than half the thickness of enamel penetration; Score 2 -tracer agent reaching half the enamel thickness; Score 3 -entire enamel depth penetration, without reaching dentin and Score 4 -tracer agent reaching dentin. For roughness and microhardness evaluation were used one-way ANOVA and Dunnet post-test for independent samples, and t test for paired samples. For permeability, the data were analyzed by Kruskal Wallis and Dunn tests. Results: A significantly higher permeability and surface roughness were observed in groups HP35, HPF38 and HPC35 compared to the C group, as well as decreased microhardness (p<0.05). Conclusions: All bleaching agents increased permeability and surface roughness, and decreased microhardness of human enamel; thus, the addition of fluoride or calcium was not beneficial.

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“…While studies on the effects of bleaching on morphological changes to tooth tissue are contradictory, it is generally agreed that peroxides can alter tooth mineral content. 12 Scanning electron microscopy (SEM) is a rapid and convenient method for qualitatively analyzing the surface morphology of enamel and dentine specimens following bleaching. 2 On the other hand, energy dispersive spectrometry (EDS) provides a specific method for determining the concentration of chemical elements on the substratum.…”

Section: Introductionmentioning

confidence: 99%

Chemical Analysis of Enamel and Dentin Following the Application of Three Different At-home Bleaching Systems

Cakir¹,

Korkmaz²,

Fırat³

et al. 2011

Operative Dentistry

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Bleaching procedures with different concentrations of carbamide peroxide may influence the chemical composition of enamel and dentin. SUMMARYPurpose: To determine the change in the chemical composition of enamel and dentin as well as to evaluate the differences in surface texture of the same dental hard tissues following three at-home bleaching systems in vitro.Methods: Sixty extracted intact human anterior teeth were used in this study. Thirty teeth were used as samples for enamel, and the buccal surfaces of the remaining 30 teeth were abraded and used as dentin samples. Prior to bleaching treatments, calcium (Ca), phosphorus (P), potassium (K), sodium (Na), magnesium (Mg), fluoride (F), and oxygen (O) levels of each sample were measured using an energy dispersive spectrometer. The teeth were then randomly allocated into three groups according to the bleaching system used, as follows: GI, 10% carbamide peroxide (CP); GII, 20% CP; GIII, and 35% CP. Following the bleaching treatments, Ca, P, K, Na, Mg, F, and O measurements were repeated. The surface configurations were examined using scanning electron microscopy (SEM). The data were analyzed using Wilcoxon signed rank and Kruskal-Wallis tests followed by the Dunn test.

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The effect of 24h non-stop hydrogen peroxide concentration on bovine enamel and dentine mineral content and microhardness

Cited by 106 publications

References 23 publications

Methods for Assessment of Dental Erosion

Methods for Assessment of Dental Erosion

Effect of bleaching agents containing fluoride or calcium on enamel microhardness, roughness and permeability

Chemical Analysis of Enamel and Dentin Following the Application of Three Different At-home Bleaching Systems

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