The effect of fluoride therapies on the morphology of bleached human dental enamel

Ferreira, Stella da Silva; Araújo, Jesuína Lamartine Nogueira; Morhy, Omar Neves; Tapety, Celiane Mary Carneiro; Youssef, Michel Nicolau; Sobral, María Angela Pita

doi:10.1002/jemt.20939

Cited by 45 publications

(49 citation statements)

References 29 publications

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“…The images corresponding to the experimental groups show erosions and discontinuities on enamel surface compared to the control group. Others authors identified craters, depression areas, erosion, aprismatic layer removal and exposure of the enamel rods 24 . This may be explained by the radicals stemming from oxidizing agents, i.e., diffusion of them at about 100 ìm on the enamel surface 23 .…”

Section: Discussionmentioning

confidence: 99%

Dental bleaching agents with calcium and their effects on enamel microhardness and morphology

et al. 2015

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Aim: To evaluate enamel microhardness and morphology after bleaching with hydrogen peroxide containing calcium in different concentrations. Methods: One hundred specimens of human teeth were ground and polished and had the initial microhardness evaluated. The specimens were randomly assigned into five groups (n=20): Group 1 -Control group (no treatment); Group 2 -Home Peroxide 6% (without calcium); Group 3 -Home Peroxide 7.5% (without calcium); Group 4 -White Class 6% (with calcium); Group 5 -White Class 7.5% (with calcium). For each group, the bleaching was performed according to the manufacturer's specifications. The specimens were bleached once a day for 5 days and subjected to pH cycling. Microhardness and scanning electron microscopy (SEM) analysis were performed before and after bleaching. Results: The results showed that groups submitted to bleaching treatment presented hardness loss compared to the control group. The group of 7.5% hydrogen peroxide with calcium showed a lower percentage of hardness loss in relation to other groups. Conclusion: Calcium in association with a higher hydrogen peroxide concentration may decrease microhardness changes on enamel.

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Section: Discussionmentioning

confidence: 99%

Dental bleaching agents with calcium and their effects on enamel microhardness and morphology

et al. 2015

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“…The morphological changes caused by the peroxides of high concentration are not evidenced macroscopically; however, microscopic changes, such as increased porosity, depressions, and superficial irregularities have been reported. 12 Studies have revealed mineral loss, increased susceptibility to erosion or caries, increased surface roughness; reduced enamel tensile strength, reduced fracture stability or a decrease in abrasion resistance of bleached enamel tissues.…”

Section: Introductionmentioning

confidence: 99%

In situ Effect of Nanohydroxyapatite Paste in Enamel Teeth Bleaching

Gomes¹,

Alexandrino²,

Alencar³

et al. 2017

The Journal of Contemporary Dental Practice

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Aim: Evaluate in situ the effect of nanohydroxyapatite paste (nano-HAP) before bleaching with hydrogen peroxide 35% (HP35%) by ion chromatography (IC) Knoop hardness number (KHN) and tristimulus colorimetry (TC). Materials and methods:A total of 60 fragments were obtained from third molars included (3 mm × 3 mm × 3 mm) and the specimens were divided into three groups (n = 20): Gas chromatography (CG) (negative control group) = no bleaching; HP35% (positive control group) = HP35% whitening (whiteness HP35%); nano-HAP = application for 10 minutes before bleaching treatment + HP35%. The specimens were fixed to the volunteers' molars. The KHN and TC were measured before and after bleaching. For IC, the dentin layer was removed, leaving the enamel that was crushed, and autoclaved for chemical quantification (calcium, fluorine, and phosphorus). The results of KHN and TC were analyzed statistically by analysis of variance (ANOVA) followed by Tukey test (p < 0.05). Results:The HP35% group showed reduction of the Ca, F, and P ions. The initial and final KHN mean of the CG and nano-HAP did not differ statistically; however, the group of HP35% did differ statistically. The mean ΔE of the HP35% and nano-HAP groups did not differ statistically from each other. However, they differed from the CG. Conclusion:The nano-HAP paste preserved the KHN, promoted the lower loss of Ca and P ions and an increase of F ions when compared with the CG, but did not influence the effectiveness of the bleaching treatment.Clinical significance: Nano-HA is a biomaterial that has shown positive results in the prevention of deleterious effects on the enamel by the action of the office bleaching treatment.

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“…Although in-office bleaching is performed using high concentration hydrogen peroxide (15%-40%),12 it becomes a widely used procedure because of these advantages: Minimally invasive, immediate visible results and no need of patient cooperation 13. Also, in-office whitening is the best for patients who need close monitoring for clinical conditions such as pronounced gingival recession or deep, unrestored abfraction lesions, and necessary for tooth discolouration associated with endodontic therapy 2…”

Section: Introductionmentioning

confidence: 99%

The effect of light-activation sources on tooth bleaching

Baroudi

Hassan

2014

Niger Med J

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Vital bleaching is one of the most requested cosmetic dental procedures asked by patients who seek a more pleasing smile. This procedure consists of carbamide or hydrogen peroxide gel applications that can be applied in-office or by the patient (at-home/overnight bleaching system). Some in-office treatments utilise whitening light with the objective of speeding up the whitening process. The objective of this article is to review and summarise the current literature with regard to the effect of light-activation sources on in-office tooth bleaching. A literature search was conducted using Medline, accessed via the National Library of Medicine Pub Med from 2003 to 2013 searching for articles relating to effectiveness of light activation sources on in-office tooth bleaching. This study found conflicting evidence on whether light truly improve tooth whitening. Other factors such as, type of stain, initial tooth colour and subject age which can influence tooth bleaching outcome were discussed. Conclusions: The use of light activator sources with in-office bleaching treatment of vital teeth did not increase the efficacy of bleaching or accelerate the bleaching.

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The effect of fluoride therapies on the morphology of bleached human dental enamel

Cited by 45 publications

References 29 publications

Dental bleaching agents with calcium and their effects on enamel microhardness and morphology

Dental bleaching agents with calcium and their effects on enamel microhardness and morphology

In situ Effect of Nanohydroxyapatite Paste in Enamel Teeth Bleaching

The effect of light-activation sources on tooth bleaching

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