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 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 Hydrogen peroxide induces cell proliferation and apoptosis in pulp of rats after dental bleaching in vivo

2017 ◽  
Vol 81 ◽  
pp. 103-109 ◽  
Author(s):  
Francine Benetti ◽  
João Eduardo Gomes-Filho ◽  
Luciana Louzada Ferreira ◽  
Edilson Ervolino ◽  
André Luiz Fraga Briso ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Cell Proliferation ◽  
Dental Bleaching ◽  
Proliferation And Apoptosis

scholarly journals Dental bleaching with and without LED/Laser association: a split-mouth controlled study

2016 ◽  
Vol 73 (4) ◽  
pp. 267
Author(s):  
André Manoel Lima da Fonseca ◽  
Inger Campos Tuñas ◽  
Fábio Vidal ◽  
Fábio Ramôa Pires ◽  
Lucio Souza Gonçalves
Keyword(s):  
Hydrogen Peroxide ◽  
Diode Laser ◽  
Tooth Bleaching ◽  
Controlled Study ◽  
Dental Bleaching ◽  
Color Changes ◽  
Anterior Teeth ◽  
Color Scale ◽  
Bleaching Procedure ◽  
Visual Color

Objective: The aim of this study was to compare dental color changes after a one-session tooth bleaching procedure using 35% hydrogen peroxide with and without hybrid light (LED/diode laser) activation. Material and Methods: 20 volunteers were included in a split-mouth controlled clinical trial. A 35% hydrogen peroxide gel was applied directly on the buccal surface and adjacent areas of all upper anterior teeth. The six teeth were divided into two groups: the upper right incisors and canine were submitted to the tooth bleaching with the gel and the hybrid light (LED/diode laser) while the left incisors and canine were submitted to tooth bleaching with only the gel. Dental color was measured with a visual color scale and a spectrophotometer at five different moments: initial appointment, immediately after prophylaxis, and 14, 30 and 180 days after bleaching. Results: The comparison between the results of both treatments (with and without LED/laser) did not show any statistically significant differences (p > 0.05; Wilcoxon’s test) neither for objective (spectrophotometer) nor for subjective evaluations (visual color scale). Conclusion: The results of the present study showed that there are no differences in dental color changes between dental bleaching with gel and LED/Laser activation and dental bleaching with only gel.

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.

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).

Effectiveness of LED/Laser Irradiation on In-Office Dental Bleaching after Three Years

2018 ◽  
Vol 43 (1) ◽  
pp. 31-37 ◽  
Author(s):  
RFL Mondelli ◽  
FAP Rizzante ◽  
ER Rosa ◽  
AFS Borges ◽  
AY Furuse ◽  
...  
Keyword(s):  
Color Change ◽  
Color Stability ◽  
The Other ◽  
Lower Sensitivity ◽  
Activation Time ◽  
Tooth Sensitivity ◽  
Dental Bleaching ◽  
Lower Activation

SUMMARY The present in vivo randomized, triple-blinded, and split-mouth clinical study evaluated the effectiveness of a hybrid light (HL) source on the color change, stability, and tooth sensitivity in patients submitted to different in-office bleaching techniques. Twenty volunteers were divided into two groups and four subgroups. A split-mouth design was conducted to compare two in-office bleaching techniques (with and without light activation): 35% Lase Peroxide Sensy (LPS) + HL: 35% hydrogen peroxide (HP) + HL; 35% LPS: 35% HP; 25% LPS + HL: 25% HP + HL; and 35% Whiteness HP (WHP): 35% HP. For the groups activated with HL, the HP was applied on the enamel surface three consecutive times using a 3 × 2-minute protocol (three HL activations for two minutes each, with a 30-second interval for a total of seven minutes and 30 seconds) for each gel application, totaling 22 minutes and 30 seconds. For the other groups, HP was applied 3 × 15 minutes, totaling 45 minutes. A spectrophotometer was used to measure the color change (ΔE) before the treatment and 24 hours, one week, and one, 12, and 36 months after. A visual analog scale was used to evaluate the tooth sensitivity before the treatment, immediately following treatment, 24 hours, and one week after. Analysis of variance, Tukey's, Kruskall-Wallis, and Wilcoxon tests, all with α = 0.05 were performed. Statistical analysis did not reveal any significant differences (ΔE) between the in-office bleaching techniques with or without HL in the periods evaluated; the activation with HL required 50% less time to achieve such results. The groups without HL presented statistical differences for ΔE when comparing 24 hours with the other follow-up times (intergroup) and an increase in tooth sensitivity in the initial periods. All techniques and bleaching agents were effective on bleaching during a 36-month evaluation of color stability. The groups activated with HL presented lower sensitivity and required a lower activation time.

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 CROP IMPROVEMENT THROUGH INDUCING MUTAGENESIS IN VIVO USING COLCHICINE ON COWPEA (Vigna unguiculata L. Walp)

2017 ◽  
Vol 4 (2) ◽  
pp. 85
Author(s):  
I Gede Ketut Susrama ◽  
I Gede Putu Wirawan
Keyword(s):  
Hydrogen Peroxide ◽  
Vigna Unguiculata ◽  
Color Change ◽  
Leaf Shape ◽  
Crop Improvement ◽  
Leaf Beetle ◽  
Distilled Water ◽  
Bean Leaf Beetle ◽  
Shape Changes

Colchicine treatments of 0.005% and 0.01% either in distilled water or in hydrogen peroxide 3% were caused temporary leaf shape changes on cowpea. Treatment of colchicine in hydrogen peroxide 3% resulted in green pod color change to purple however treatment of just hydrogen peroxide 3% and colchicine in hydrogen peroxide 3% caused 8.8-10.7% dwarf cowpea. As a preliminary data, we also observed that cowpea crops grown from seeds treated with colchicine in distillate water attacked by bean leaf beetle much earlier compare to the treatment with colchicine in hydrogen peroxide 3%.

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 Tooth Bleaching Increases Dentinal Protease Activity

2012 ◽  
Vol 92 (2) ◽  
pp. 187-192 ◽  
Author(s):  
C. Sato ◽  
F.A. Rodrigues ◽  
D.M. Garcia ◽  
C.M.P. Vidal ◽  
D.H. Pashley ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Cathepsin B ◽  
Biochemical Properties ◽  
Tooth Bleaching ◽  
Pulp Tissue ◽  
Dental Bleaching ◽  
Force Microscopy ◽  
Atomic Force ◽  
Confocal Fluorescence

Hydrogen peroxide is an oxidative agent commonly used for dental bleaching procedures. The structural and biochemical responses of enamel, dentin, and pulp tissues to the in vivo bleaching of human (n = 20) premolars were investigated in this study. Atomic force microscopy (AFM) was used to observe enamel nanostructure. The chemical composition of enamel and dentin was analyzed by infrared spectroscopy (FTIR). The enzymatic activities of dental cathepsin B and matrix metalloproteinases (MMPs) were monitored with fluorogenic substrates. The amount of collagen in dentin was measured by emission of collagen autofluorescence with confocal fluorescence microscopy. The presence of Reactive Oxygen Species (ROS) in the pulp was evaluated with a fluorogenic 2′,7′-dichlorodihydrofluorescein diacetate (DCFDA) probe. Vital bleaching of teeth significantly altered all tested parameters: AFM images revealed a corrosion of surface enamel nanostructure; FTIR analysis showed a loss of carbonate and proteins from enamel and dentin, along with an increase in the proteolytic activity of cathepsin-B and MMPs; and there was a reduction in the autofluorescence of collagen and an increase in both cathepsin-B activity and ROS in pulp tissues. Together, these results indicate that 35% hydrogen peroxide used in clinical bleaching protocols dramatically alters the structural and biochemical properties of dental hard and soft pulp tissue.

Sign in / Sign up

Export Citation Format

Share Document