scholarly journals Effect of light and heat on bleaching action of hydrogen peroxide

2021 ◽  
Vol 10 (13) ◽  
pp. e10101320813
Author(s):  
May Anny Alves Fraga ◽  
João Pedro Castello Marcatto ◽  
Talita Malini Carletti ◽  
Lourenço Correr-Sobrinho ◽  
Américo Bortolazzo Correr
Keyword(s):  
Hydrogen Peroxide ◽  
Color Change ◽  
Color Measurement ◽  
Heat Sources ◽  
Dental Bleaching ◽  
Before And After ◽  
Bleaching Action ◽  
Gel Temperature ◽  
One Way Anova ◽  
Effect Of Light

This study aimed to verify the effect of light and heat on bleaching action of 40% hydrogen peroxide (Opalescence Boost PF – Ultradent, BR). Thirty-three bovine incisors were submitted to in-office dental bleaching and divided into three groups (n=11): CO group – control, no light or heat; CA group – heat with a hairdryer; LC group – light and heat with a photoactivation device. For this, a gingival barrier (OpalDam – Ultradent, SP, BR) isolated a circular area around the flatter region of the crown. Afterwards, the bleaching gel was applied for 15 minutes and repeated twice, totaling 45 minutes of application. For the CA and LC groups, the heat source was maintained during the application of the bleaching gel. Temperature was standardized in 5°C for both groups and monitored using a thermocouple inserted into the pulp chamber. The color measurement was performed before and after bleaching using a spectrophotometer. The inner margin of the isolated area of each dental crown was equivalent to the tip of the spectrophotometer (4 mm). Color change was verified by CIEDE2000 system (ΔE00). One way ANOVA and Tukey's test were used to analyze data (p-values set to 5%). The values of ΔE00 were equal for LC (2,66±0,29) and CA (2,44±0,88), and both were higher than CO (1,31±0,37). Therefore, light does not play a fundamental role for in-office dental bleaching. Same dental bleaching outcomes are obtained using different heat sources.

scholarly journals Effect of the Purple Corn Beverage “Chicha Morada” in Composite Resin during Dental Bleaching

Scientifica ◽  
2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Eric Dario Acuña ◽  
Leyla Delgado-Cotrina ◽  
Francisco Aurelio Rumiche ◽  
Lidia Yileng Tay
Keyword(s):  
Hydrogen Peroxide ◽  
Green Tea ◽  
Composite Resin ◽  
Color Change ◽  
Color Measurement ◽  
Distilled Water ◽  
Dental Bleaching ◽  
Color Changes ◽  
Bleaching Procedure ◽  
Purple Corn

During dental bleaching the staining potential of the surface would increase. This study aims to evaluate the staining susceptibility of one bleached composite resin after the exposure to three different beverages: Peruvian purple corn based beverage (chicha morada), green tea, and distilled water. Thirty disk-shaped specimens of one nanofill composite resin were prepared. The specimens were then divided into six groups (n=5): purple corn (P), purple corn + bleaching (PB), green tea (T), green tea + bleaching (TB), distilled water (W), and distilled water + bleaching (WB). In groups that received bleaching, two sessions of bleaching with 35% hydrogen peroxide were done. Following bleaching, specimens were exposed to each liquid thirty minutes daily. Color was measured with a digital spectrophotometer. For statistical analysis, color measurement differences between the obtained results were used: during bleaching, after bleaching, and during + after bleaching. Two-way ANOVA was used to compare the color changes in the resins of all groups (p<0.05). We conclude that all the evaluated beverages produced changes of color in the composite resin regardless of the bleaching procedure. However, purple corn was the only beverage that caused a perceptible color change (ΔE>3.3).

scholarly journals Bleaching Stained Arrested Caries Lesions: In vivo Clinical Study

2020 ◽  
Author(s):  
Sarah S. Al-Angari ◽  
Mashael AlHadlaq ◽  
Noor Abahussain ◽  
Njood AlAzzam
Keyword(s):  
Hydrogen Peroxide ◽  
Color Change ◽  
Conservative Approach ◽  
Dental Bleaching ◽  
B Values ◽  
Visual Color ◽  
Before And After ◽  
Caries Lesions ◽  
Paired T Test

Abstract Objective Conservative approaches to esthetically treat stained arrested caries lesions (s-ACLs) have not been explored in clinical studies. This study aims to investigate the efficacy of in-office dental bleaching agent, as a conservative approach, to esthetically treat s-ACLs. Materials and Methods Twelve patients (n = 46) presented with s-ACLs were treated with 40% hydrogen peroxide (in-office bleaching protocol; 20 minutes × 3). Color values were measured using a spectrophotometer (CIE L*a*b*), aided with digital photography to assess visual color change clinically. Measurements were taken for each specimen at baseline and immediately after bleaching. Statistical Analysis The color change calculated before and after bleaching for each dental substrate was analyzed using paired t-test (α = 0.05). Results The bleached s-ACLs had a significant increase in L* values (p < 0.001), and a significant decrease in both a* (p = 0.001) and b* (p = 0.007) values, indicating lighter color improvement (bleaching efficacy). The baseline mean L*, a*, and b* values were 61.5, 2, and 15.4, respectively, and after bleaching were 67.7, 1.4, and 13.3, respectively, with a mean increase in ∆E of >7.9, which resulted in a visible clinical stain improvement as orange/light brown stains were removed completely, while gray/black stains improved to a lesser extent. Conclusion Significant color improvement was observed when the in-office bleaching protocol (40% hydrogen peroxide) was used in orange/brown s-ACLs. However, it showed lesser improvement in gray/black s-ACLs.

scholarly journals Evaluation of dental enamel color after fixed orthodontic therapy using two types of protectors to prevent white spot lesions (A prospective clinical study)

2020 ◽  
Vol 32 (2) ◽  
pp. 17-21
Author(s):  
Yasir Allabban
Keyword(s):  
Color Change ◽  
Dental Enamel ◽  
White Spot ◽  
P Value ◽  
Prospective Clinical Study ◽  
White Spot Lesions ◽  
Significant Difference ◽  
Before And After ◽  
Fixed Appliances ◽  
One Way Anova

Background: The aim of this study is to evaluate the color change ∆E of the dental enamel following treatment with 2 kinds of protector (icon infiltrant, clinpro varnish) before fixed orthodontic treatment to avoid the possible white spot lesions. Materials and Methods: Fifty four subjects treated with fixed appliances were divided into 3 groups: the 1st group was control, while the 2nd and 3rd groups were treated with icon infiltrant and clinpro varnish before bonding procedure, respectively. Color parameters (L,a,b) were recorded for the middle and gingival thirds before and after bonding procedure to get the ∆E of each group. Results: One-way ANOVA test showed a non-significant difference in ∆E between the 3 groups at p value <0.05, while there were highly significant differences in value of ∆E between middle thirds and the gingival thirds in all groups. Conclusion: The icon infiltrant and clinpro varnish have no effect on color of the enamel when used before the bonding procedure. Color change ∆E occurring in middle third is higher than that of the gingival third. Keywords: Color change, protector, white spot lesions

scholarly journals Can ozone or violet light improve the color change or physicochemical properties of hydrogen peroxide-bleached tooth?

2021 ◽  
Vol 32 (4) ◽  
pp. 19-30
Author(s):  
Nayara Rodrigues Nascimento Oliveira Tavares ◽  
Alexia da Mata Galvão ◽  
Lia Dietrich ◽  
Roberta Furtado Carvalho ◽  
Robinson Sabino Silva ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Roughness ◽  
Color Change ◽  
Repeated Measure ◽  
Color Changes ◽  
Violet Light ◽  
Atomic Force ◽  
Measure Anova ◽  
Before And After ◽  
To Receive

Abstract: This study investigated the bleaching effectiveness and the physicochemical effects on enamel of violet light and ozone, associate or not to hydrogen peroxide, compared to 35%-hydrogen peroxide. Enamel-dentin blocks from human molars were randomly allocated to receive one of the following bleaching protocols (n=15): (HP) 35%-hydrogen peroxide, (VL) violet light, (OZ) ozone, the association between hydrogen peroxide with ozone (OZ+HP) or violet light (VL+HP). All protocols were performed in two sessions with a 48h interval. Color (spectrophotometer) and mineral composition (Raman spectroscopy) were measured before and after the bleaching. Color changes were calculated by ΔEab, ΔE00, and whitening index (WI). The surface roughness was measured with an atomic force microscope. Data were analyzed by One-way or Two-way repeated measure ANOVA followed by the Tukey’s test (α = 0.05). The lowest color change values (either measured by WI, ΔEab, or ΔE00) were observed for VL and OZ used with no HP. Violet light associate with HP was unable to improve the color changes observed for the peroxide alone, in combination with OZ and HP, the highest color changes were verified. Regardless of bleaching protocol, the bleached enamel presented higher contents of PO4 and CO3 -2 than those observed at baseline. All bleaching protocols resulted in similar enamel surface roughness. Both the VL and the OZ caused reduced effects on the enamel color change when used alone. The ozone therapy improved the bleaching effect in the group that received the association of HP.

Effect of Liquid Polishing System on Color Stability of Bleached Enamel

2013 ◽  
Vol 804 ◽  
pp. 141-145
Author(s):  
Xiu Lan Chen ◽  
Huang Qin Chen
Keyword(s):  
Red Wine ◽  
Color Change ◽  
Color Stability ◽  
Control Groups ◽  
Significant Difference ◽  
Before And After ◽  
Total Color Change ◽  
Post Hoc ◽  
And Control ◽  
One Way Anova

The purpose of this study was to investigate the effect of liquid polishing system (BisCover) on color stability of the bleached enamel upon exposure to a staining agent-red wine. Forty specimens were prepared. They were divided into 2 groups and different procedures, including only bleaching with Opalescence PF (PF) or Opalescence regular (R) gels, and application of BisCover after blaeching (PF-B, R-B) were used. Unbleached specimens were served as control groups (control-1 and control-2). The specimens were stored for 48 h in red wine. The color of all specimens was measured before and after exposure with a spectrophotometer, and total color change (ΔE*) were calculated. The data were analyzed with a one-way ANOVA and the means were compared by Tukeys post hoc analysis (α=0.05). PF-B and R-B groups demonstrated significantly less color change than PF and R groups. the control-1 and control-2 groups had the least color change. No significant difference were observed between PF and R group. BisCover improved the color stability of bleached enamel in red wine.

scholarly journals Effect of Different Bleaching Methods on Optical Behaviors of CAD/CAM Ceramics

2021 ◽  
Vol 13 (4) ◽  
pp. 113-118
Author(s):  
Saeed Nikanjam ◽  
Samaneh Abbasi ◽  
Sara Khazaei
Keyword(s):  
Hydrogen Peroxide ◽  
Significant Influence ◽  
Color Change ◽  
Mean Value ◽  
Carbamide Peroxide ◽  
Mean Values ◽  
Before And After ◽  
Cad Cam ◽  
The Mean ◽  
Final Color

Background: The present study aimed to survey the influence of two different bleaching techniques on changes of color, translucency, and whiteness of the four CAD/CAM materials. Methods: The monolithic blocks of Vita Suprinity, Vita Enamic, IPS e.max CAD, and Katana Zirconia were sectioned to discs with thickness of 2 mm (n=30 / each group). Samples from each type of ceramic were assigned to three subgroups: 1) the 40% hydrogen peroxide for 20 minutes; 2) the 16% carbamide peroxide for three hours/day for 2 weeks; and 3) the control. Then CIELab coordinates of each sample were evaluated before and after the intervention by a spectrophotometer. Final color change (ΔE), Whiteness (ΔWI D), and Translucency Parameter (ΔTP) were calculated. Two-way ANOVA test was adopted to analyze the data (α=0.05). Results: Type of ceramic, bleaching subgroups, and interaction between them had a statistically significant influence on mean values of ΔE, ΔWID. The influence of bleaching subgroup on the mean value of ΔTP was also significant (P<0.001). Conclusions: Carbamide peroxide 16% for three hours/day and for two weeks caused the most considerable changes in final color, whiteness, and translucency of the all tested CAD/CAM materials. Maximum color change and whiteness were detected in the Vita Enamic, which were clinically unacceptable.

scholarly journals Is It Necessary to Prepare the Enamel before Dental Bleaching?

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Andréa Dias Neves Lago ◽  
Patrícia Moreira de Freitas ◽  
Erika Michele dos Santos Araújo ◽  
Adriana Bona Matos ◽  
Narciso Garone-Netto
Keyword(s):  
Color Change ◽  
In Vitro Study ◽  
Surface Treatments ◽  
Dental Bleaching ◽  
Color Changes ◽  
Before And After ◽  
Knoop Microhardness ◽  
Previously Treated ◽  
Casein Phosphopeptide

The aim of this in vitro study was to assess the influence of distinct surface treatments on the microhardness and color of enamel that will be bleached. Surface treatments are tested, accordingly: G1, no treatment; G2, 2% sodium fluoride; G3, casein phosphopeptide paste; G4, 2% fluoride+Nd:YAG laser. Forty blocks from bovine teeth composed the sample that were tested in Knoop microhardness (n=10) and in color change (n=10). After 24 h, bleaching with 35% hydrogen peroxide was performed for 45 min. Microhardness and color changes (using parametersΔE,ΔL,Δa, andΔb) were assessed before and after bleaching. The data were analyzed by two-way ANOVA and Tukey’s test (p<0.05). Despite all surface treatments, a reduction of enamel microhardness occurred immediately after bleaching in all groups, being greater in G1. Enamel color changed in all groups. Immediately after bleaching, there was a decrease on enamel microhardness. However, after 7 days, some of those specimens previously treated before bleaching significantly recovered their initial microhardness without influencing the esthetic results of bleaching.

scholarly journals Dynamic Model of Hydrogen Peroxide Diffusion Kinetics into the Pulp Cavity

2012 ◽  
Vol 13 (4) ◽  
pp. 440-445 ◽  
Author(s):  
So Ran Kwon ◽  
Li Yiming ◽  
Udochukwu Oyoyo ◽  
Raydolfo M Aprecio
Keyword(s):  
Hydrogen Peroxide ◽  
Dynamic Model ◽  
Time Course ◽  
Color Change ◽  
Color Measurement ◽  
Control Group ◽  
Diffusion Kinetics ◽  
Peroxide Bleaching ◽  
Pulp Cavity ◽  
Color Measurements

ABSTRACT Aim To measure the time course hydrogen peroxide penetration into the pulp cavity and evaluate short-term tooth color changes after bleaching. Materials and methods Twenty extracted human canines were sectioned, pulp tissue removed and the cavity enlarged. Teeth were painted with nail varnish to leave a 6-mm diameter circle on the buccal surface. Baseline color was measured spectrophotometrically. Teeth were randomized into a control group (n = 10) treated with 30 μl of glycerin base and a bleaching group (n = 10) exposed to 30 μl of 40% hydrogen peroxide for 1 hour. A linear low density polyethylene wrap was placed to prevent evaporation of the material. Acetate buffer was placed into the cavity and replenished every 10 minutes and placed into plastic tubes. Hydrogen peroxide amount was estimated spectrophotometrically using leukocrystal violet and horseradish peroxidase. Specimen color was remeasured immediately after bleaching, 1 hour, 1 day 1, 2 and 6 weeks postbleaching. Color change was measured per Commission Internationale de l'Eclairage methodology. Mann-Whitney procedure was used to assess baseline color measurements and total hydrogen peroxide penetration amount. Friedman's test was used to assess within group differences for color change and hydrogen peroxide penetration. Results There was significantly greater hydrogen peroxide penetration in the bleaching group (p < 0.05). Hydrogen peroxide penetration levels were constant throughout the 1-hour evaluation period in the bleaching group. The groups showed no difference at baseline with respect to any of L*a*b color measurements (p > 0.05). The postbleaching color measurement showed an increase of change in overall color (ΔE) and lightness (ΔL) up to 1 week followed by a gradual stabilization up to 6 weeks. Conclusion This dynamic model provided information about the time course diffusion kinetics into the pulp cavity, demonstrating constant penetration of hydrogen peroxide into the pulp cavity during a 1-hour bleaching session. Clinical significance A prolonged application of 40% hydrogen peroxide bleaching material for 1 hour produces constant penetration of hydrogen peroxide into the pulp cavity in vitro. How to cite this article Kwon SR, Li Y, Oyoyo U, Aprecio RM. Dynamic Model of Hydrogen Peroxide Diffusion Kinetics into the Pulp Cavity. J Contemp Dent Pract 2012;13(4):440-445.

scholarly journals Influence of whitening gel on pulp chamber temperature rise by in-office bleaching technique

2013 ◽  
Vol 42 (6) ◽  
pp. 432-438
Author(s):  
Sandro Cordeiro Loretto ◽  
Mylena Ranieri Libdy ◽  
Fabiola do Socorro da Rocha Ribeiro ◽  
Esther Marina França Braga ◽  
Karina Gama Kato Carneiro ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Adverse Effects ◽  
Temperature Rise ◽  
Light Flash ◽  
Pulp Chamber ◽  
Dental Bleaching ◽  
Thermal Paste ◽  
Chamber Temperature ◽  
The Aesthetic ◽  
One Way Anova

INTRODUCTION: Dental bleaching is a conservative method for the aesthetic restoration of stained teeth. However, whitening treatments are likely to cause adverse effects when not well planned and executed. OBJECTIVE: This study evaluated the influence of whitening gel on temperature rise in the pulp chamber, using the in-office photoactivated dental bleaching technique. MATERIAL AND METHOD: The root portion of an upper central human incisor was sectioned 3mm below the cemento-enamel junction. The root canal was enlarged to permit the insertion of the K-type thermocouple sensor (MT-401) into the pulp chamber, which was filled with thermal paste to facilitate the transfer of heat during bleaching. Three photosensitive whitening agents (35% hydrogen peroxide) were used: Whiteness HP (FGM), Whiteness HP Maxx (FGM) and Lase Peroxide Sensy (DMC). An LED photocuring light (Flash Lite - Discus Dental) was used to activate the whitening gels. Six bleaching cycles were performed on each group tested. The results were submitted to one-way ANOVA and LSD t-test (α<0.05). RESULT: The lowest mean temperature variation (ºC) was detected for Lase Peroxide Sensy (0.20), while the highest was recorded for Whiteness HP (1.50). CONCLUSION: The Whiteness HP and Whiteness HP Maxx whitening gels significantly affected the temperature rise in the pulp chamber during bleaching, and this variation was dependent on the type of whitening gel used.

Effect of Resin Cements for Porcelain Veneers on the Color Stability after Accelerated Ageing

2012 ◽  
Vol 624 ◽  
pp. 216-220
Author(s):  
Jun Ai ◽  
Long Quan Shao ◽  
Shan Yu Zhou ◽  
Lin Lin Wang ◽  
Chen Hu ◽  
...  
Keyword(s):  
Total Energy ◽  
Color Change ◽  
Color Stability ◽  
The Other ◽  
Color Measurement ◽  
Accelerated Ageing ◽  
Distilled Water ◽  
Resin Cements ◽  
Before And After ◽  
Cie Lab

To assess the color stability of different resin cements after accelerated ageing. Four different resin cements were included in the study (1mm thickness). The resin cements were bonded to ceramic disks (0.5mm thickness) built with the VITABLOCS MARK-Ⅱ ceramic (n=7). All of the samples were stored in 37°C distilled water at dark. Then color measurement were determined using spectrophotometric before and after accelerated ageing in a weathering machine with a total energy of 150kJ/m2. Changes in color (ΔE) were obtained using the CIE Lab system coordinates where a ΔE data above 3 was accepted as visible discoloration. The ΔE of Superbond C&B, RelyX ARC, Variolink Veneer and Tetric Flow were 2.24±0.52, 2.47±0.28, 0.62±0.31 and 0.72±0.31 respectively. The Superbond C&B and RelyX ARC achieved significant higher ΔE than the other groups (P0.05). All of the resin cements assessed in this study show varying degrees of discoloration after accelerated ageing. However, the color change are not beyond the clinical aesthetic demand. And the Tetric Flow and Variolink Veneer demonstrate a higher color stability.

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