Color change, diffusion of hydrogen peroxide, and enamel morphology after in‐office bleaching with violet light or nonthermal atmospheric plasma: An in vitro study

Kury, Matheus; Perches, Carolina; Silva, Daylana Pacheco da; André, Carolina Bosso; Tabchoury, Cínthia Pereira Machado; Giannini, Marcelo; Cavalli, Vanessa

doi:10.1111/jerd.12556

Cited by 58 publications

(50 citation statements)

References 45 publications

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“…The low-molecular weight of hydrogen peroxide promotes diffusion through interprismatic spaces, which may alter enamel surface morphology. 2,17 Even though this was not the main purpose of this research, it was observed that the combination CP/WT increased Ra in comparison to CP and CP/RT, which is an important evidence corroborating another finding that combination of CP with whitening toothbrushing may compromise enamel Ra. 10 Although SEM analysis of CP/RT indicated continuous irregularity of the enamel surface, it was less pronounced than that of CP/WT group.…”

Section: Discussionsupporting

confidence: 82%

“…Simulated toothbrushing with activated charcoal significantly decreased a* values, and this outcome occurred possibly due to the staining protocol adopted with black tea, which deposits extrinsic pigments on the enamel surface. 3,7,17 However, it should be pointed out that isolation of dentin previous to black tea immersion prevented the F I G U R E 2 Mean values and SD of L*, a*, and b* obtained for whitening and toothpaste combinations over time (T B and T 0 ). Means with symbols differ at 5% according to two-way ANOVA and Tukey test.…”

Section: Discussionmentioning

confidence: 99%

“…Afterward, blocks for 24 hours. 16,17 The dentin walls were isolated using a nail varnish before the blocks being completely immersed in the tea infusion and continuously stirred.…”

Section: Specimens Preparationmentioning

confidence: 99%

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Effects of activated charcoal powder combined with toothpastes on enamel color change and surface properties

Palandi

Kury

Picolo

et al. 2020

J Esthet Restor Dent

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Aim: To evaluate the effects of activated charcoal powder (COAL) combined with regular (RT) or whitening (WT) toothpastes on enamel color and surface in comparison to carbamide peroxide (CP). Methods: Dental blocks (n = 10/group) were randomly divided into COAL, COAL/ RT, COAL/WT, CP, CP/RT, CP/WT, RT, WT, and CONT (without treatment). Simulated toothbrushing and whitening treatments were followed by colorimetric (ΔE 00 , L*, a*, b*), surface roughness (Ra), and enamel topography assays. ΔE 00 was submitted to two-way ANOVA and Tukey test. Color coordinates and Ra were tested with three-way repeated measures ANOVA (α = 5%). Results: COAL exhibited greater ΔE 00 than CONT (P = .048), but it did not enhance ΔE 00 promoted by RT or WT (P > .05). COAL alone increased Ra (P < .001) and altered enamel topography. COAL did not increase Ra caused by RT and WT (P > .05). CP exhibited the highest ΔE 00 (P < .05), but it raised Ra and changed enamel topography to a less extent than COAL. Conclusion: Even though charcoal powder did not increase enamel Ra when combined with toothpastes, the topography was negatively impacted by COAL. Also, COAL was unable to enhance the color change of RT and WT, or reach the effectiveness of CP. Clinical Significance: The use of activated charcoal-based product, claimed as a natural whitener, before brushing with toothpastes is not only ineffective to change the color of teeth, but also it might result in alterations on the enamel surface. Whitening with CP, instead, was effective during the same period of treatment, which still represents a more appropriate technique to whiten teeth.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

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Effects of activated charcoal powder combined with toothpastes on enamel color change and surface properties

Palandi

Kury

Picolo

et al. 2020

J Esthet Restor Dent

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“…15 Recent in vitro studies demonstrated that a peroxide-free protocol with violet LED promoted color and whiteness changes in stained teeth. 9,19 Thus, it is expected that LED could prevent damages on enamel surface and the absence of HP and the diffusion of its by-products into the pulp chamber may reduce TS. On the other hand, the mechanism of action of violet LED combined with bleaching gels could be explained by the increase in gels temperature and, consequently, the increase in HP decomposition into free radicals, 2 thereby increasing bleaching efficacy.…”

Section: Introductionmentioning

confidence: 99%

Effect of violet LED light on in-office bleaching protocols: a randomized controlled clinical trial

et al. 2020

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Colorimetric evaluation was performed using a spectrophotometer (ΔE, ΔL, Δa, Δb) and a visual shade guide (ΔSGU). Calcium (Ca)/phosphorous (P) ratio was quantified in the enamel microbiopsies. Measurements were performed at baseline (T 0), after bleaching (T B) and in the 14-day follow-up (T 14). At each bleaching session, a visual scale determined the absolute risk (AR) and intensity of tooth sensitivity (TS). Data were evaluated by one-way (ΔE, Δa, ΔL, Δb), two-way repeated measures ANOVA (Ca/P ratio), and Tukey post-hoc tests. ΔSGU and TS were evaluated by Kruskal-Wallis and Mann-Whitney, and AR by Chi-Squared tests (a=5%). Results: LED produced the lowest ΔE (p<0.05), but LED/HP promoted greater ΔE, ΔSGU and Δb (T 14) than HP (p<0.05). No differences were observed in ΔE and ΔSGU for LED/CP and HP groups (p>0.05). ΔL and Δa were not influenced by LED activation. After bleaching, LED/CP exhibited greater Δb than CP (p>0.05), but no differences were found between these groups at T 14 (p>0.05). LED treatment promoted the lowest risk of TS (16%), while HP promoted the highest (94.4%) (p<0.05). No statistical differences of risk of TS were found for CP (44%), LED/CP (61%) and LED/HP (88%) groups (p>0.05). No differences were found in enamel Ca/P ratio among treatments, regardless of evaluation times. Conclusions: Violet LED alone produced the lowest bleaching effect, but enhanced HP bleaching results. Patients treated with LED/CP reached the same efficacy of HP, with reduced risk and intensity of tooth sensitivity and none of the bleaching protocols adversely affected enamel mineral content.

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“…According to Kury et al 15 (2020), the bleaching treatment with violet LED (VL) showed similar enamel morphology to the untreated group (C), which shows the safety of its use for dental enamel. These similarities were also observed in this study.…”

Section: Discussionmentioning

confidence: 96%

Effect of violet led associated with low-concentration hydrogen peroxide on enamel surface roughness

et al. 2020

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Aim: The present study aimed to assess in vitro the effect ofviolet LED in tooth bleaching techniques associated or not withlow-concentration hydrogen peroxide gel on enamel surfaceroughness. Methods: Fifty-two enamel fragments of bovineteeth were flattened and polished (4x4x3 mm) and dividedinto four groups according to bleaching treatment: VL- VioletLED; HP- 7.5% hydrogen peroxide; HP+VL- 7.5% hydrogenperoxide + violet LED; C- No bleaching (control). Before thetreatments, all specimens were immersed in 20 mL of blacktea for six days, changing solutions every 24 h to simulatethe staining of specimens. Forty fragments were used toanalyze surface roughness (n=10) and 12 fragments wereused for the morphological analysis (SEM) (n=3). Results:The data were submitted to one-way ANOVA and a post-hocTukey test. The lower roughness values was observed for thegroup that did not receive bleaching treatment (C), differingsignificantly only from the group bleached with 7.5% hydrogenperoxide + violet LED (HP+VL) (p=0.0077). The remaininggroups did not show significant differences in roughnessvalues (p>0.05). The scanning electron microscopy analysisshowed irregularities on the enamel surface regardless ofthe treatment received. Conclusion: The results showedthat bleaching treatments with violet LED associated withlow-concentration hydrogen peroxide gels (7.5%) increasethe surface roughness of tooth enamel.

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Color change, diffusion of hydrogen peroxide, and enamel morphology after in‐office bleaching with violet light or nonthermal atmospheric plasma: An in vitro study

Cited by 58 publications

References 45 publications

Effects of activated charcoal powder combined with toothpastes on enamel color change and surface properties

Effects of activated charcoal powder combined with toothpastes on enamel color change and surface properties

Effect of violet LED light on in-office bleaching protocols: a randomized controlled clinical trial

Effect of violet led associated with low-concentration hydrogen peroxide on enamel surface roughness

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