The effect of laser-activated bleaching with 810 nm and 980 nm diode lasers on enamel micro-hardness; an <i>in vitro</i> study

Saati, Keyvan; Orumchi, Azin; Namdar, Fatemeh; Jarrah, Azin; Chiniforush, Nasim

doi:10.1088/1555-6611/ab6027

Cited by 3 publications

(6 citation statements)

References 38 publications

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“…Mushashae et al [21] and Kabbach et al [22] mentioned the duration of exposure to bleaching agent as a paramount factor in the reduction of enamel microhardness in addition to other factors such as the bleaching agent pH and concentration, so it seems that the higher concen-tration of hydrogen peroxide and longer exposure duration in group 3 compared to other groups is another cause for reduction of microhardness. In contrast to the current study, Saati et al [23] reported that Vickers microhardness of enamel after bleaching with Opalescence Boost PF did not change significantly compared to the other group that laser-assisted bleaching was done by using a diode laser. Using bleaching gel with high concentrations of hydrogen peroxide (35% to 50%) combined with a light source such as QTH lamp, diode laser, argon laser, or LED during office bleaching is suggested to decrease bleaching time.…”

Section: Discussioncontrasting

confidence: 99%

Microhardness change of human dental enamel due to power bleaching with different gels

Moradi¹,

Valizadeh²,

Farhadi³

et al. 2022

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Aim: Since the introduction of bleaching treatments in the office, different lights have been suggested to accelerate the bleaching reaction. This study aimed to evaluate the microhardness of tooth enamel after office bleaching using different materials. Materials nd methods: Thirty-three sound human upper premolars were randomly divided into 3 groups as follows (n=11): Group 1: Whitesmile HP40% gel with R&B LED light source with 3 W power output; Group 2: HP 35% Dr Smile gel with a 980 nm diode laser, 2 W power and continuous wavelength; Group 3: HP 40% Ultra boost gel according to factory instructions. Enamel surface microhardness was measured before and after the bleaching procedure in each group using the Vickers microhardness test. One-way ANOVA and Tukey post hoc tests were used for statistical analysis. We used a SEM microscope to examine the surface of one sample from each group and one sample as a negative control. Results: In group 1, enamel microhardness increased remarkably (p=0.013) whereas in group 2 and group 3 enamel microhardness decreased. Enamel microhardness decreased in group 3 significantly (p=0.00) but its reduction in group 2 was not significant (p=0.833). SEM examination of the enamel surfaces after bleaching revealed erosion and surface porosities in group 1, enamel structure melting, and shallow porosities in group 2, and enamel prism exposure and etching in group 3. Conclusions: Due to the limitations of the present study, power bleaching with HP40% Whitesmile gel with LED Monitex increases microhardness, so it can have better results for treatment in the clinic. Additionally, using Dr Smile gel with a 980 nm diode laser does not reduce surface microhardness.

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Section: Discussioncontrasting

confidence: 99%

Microhardness change of human dental enamel due to power bleaching with different gels

Moradi¹,

Valizadeh²,

Farhadi³

et al. 2022

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“…In the present study, enamel surface microhardness decreased after bleaching in all the study groups, consistent with a study by Mondelli et al 6 , in which enamel microhardness decreased after in-office bleaching with gels containing different concentrations of hydrogen peroxide (15%, 25%, and 35%). Saati et al 11 , too, showed a decreased enamel microhardness in samples bleached with 40% hydrogen peroxide alone or in association with a diode laser with 810-and 980-nm wavelengths.…”

Section: Discussionmentioning

confidence: 97%

“…When the material is mixed, fluoride appears at 1.1% concentration, and potassium nitrate appears at 3% concentration. This fluoride concentration can prevent a decrease in enamel surface microhardness to some extent 11 .…”

Section: Discussionmentioning

confidence: 99%

“…The laser used in the present study was diode laser with a wavelength of 980 nm, which is the wavelength suggested by the gel's manufacture because, at this wavelength, the diode laser is properly absorbed in the bleaching gel and increases its temperature. Besides, the diode laser with a 1.5-W output has a photothermal effect and increases peroxide precipitation, formation and release of active hydroxyl radicals, and penetration depth of bleaching agents, decreases the time needed, and finally increases the yield of the treatment process 11 .…”

Section: Discussionmentioning

confidence: 99%

“…There is no consensus about the overall effect of bleaching on tooth surface hardness, especially with laser-activated materials. Several studies have evaluated the effect of laser bleaching on enamel microhardness and reported different results 11,12 . A new type of diode laser with a 980-nm wavelength has a higher absorption rate than 810-nm laser; therefore, it is expected that it might function more conservatively and decrease bleaching time 11 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of conventional and power office bleaching with diode laser and led light on enamel microhardness

et al. 2022

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Aim: The present study aimed to asses enamel microhardness after office bleaching with diode laser and LED light compared to the conventional bleaching procedure. Methods: Thirty-nine human premolar teeth were collected and randomly divided into three groups regarding of the bleaching technique. Group 1: Snow O bleaching gel with LED light-curing unit; Group 2: Snow L bleaching gel with diode laser irradiation; and Group 3: Opalescence Boost bleaching gel with no light source in group 3. Enamel surface changes were evaluated in one tooth in each study group and one intact tooth as a reference under a scanning electron microscope (SEM). In the remaining samples (n=12), enamel microhardness was determined by Vickers microhardness test before and after bleaching. Data were analyzed with repeated-measures ANOVA to compare microhardness changes, followed by post hoc Tukey tests at the 0.05 significance level. Results: Enamel microhardness decreased in all the groups after bleaching, with the maximum decrease in microhardness in the Snow O bleaching group with LED light, which was significantly higher than the other groups (P=0.002). The two other groups did not exhibit any significant difference in microhardness decrease (P>0.05). Conclusion: Based on the limitations of this study, it can be concluded power bleaching with 980nm diode laser was less time-consuming compare to conventional bleaching procedure and yielded better outcomes in terms of enamel surface microhardness compared to the use of an LED light-curing unit.

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An Environmental Scanning Electron Microscopy Evaluation on Comparison of Three Different Bleaching Agents using the Laser Activated in-Office Bleaching at Different Wavelengths

Goenka¹,

Cirigiri²,

Poplai³

et al. 2021

Journal of Pharmacy and Bioallied Sciences

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Background: Shade of the teeth is of specific significance to the patient because of social and psychological concern and hence plays vital role as primary care. Bleaching is a noninvasive, relatively inexpensive, conservative, and low-maintenance method to change a smile dramatically. Aim: To study the effect of application of three bleaching agents at different wavelengths of laser on the enamel surface of teeth using an environmental scanning electron microscopy (ESEM). Materials and Methods: One hundred and twenty freshly extracted, noncarious intact maxillary central incisors were collected and stored in moist conditions in plastic containers. Using a randomized stratified design, the samples were divided into 12 groups (n = 10). The bleaching agent was mixed according to the manufacturer's instructions and applied on the enamel surface of the teeth followed by laser activation. The ultrastructural effects of the bleaching agent on the enamel were determined with an ESEM. Samples were assessed both before and after bleaching on the basis of the degree of surface damage. Because the observation by ESEM was designed to be qualitative, no statistical analysis was performed. Results: JW power bleaching agent and Opalescence Xtra boost showed minimum surface alteration when compared to Polaoffice. Furthermore, the groups treated with diode 810 nm showed less surface damage while neodymium-doped yttrium aluminum garnet 1064 nm more surface alterations than the groups treated with diodes. Conclusion: From this current study, it can be concluded that the diode laser of 810 nm with JW power bleaching showed minimum surface alterations.

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The effect of laser-activated bleaching with 810 nm and 980 nm diode lasers on enamel micro-hardness; an in vitro study

Cited by 3 publications

References 38 publications

Microhardness change of human dental enamel due to power bleaching with different gels

Microhardness change of human dental enamel due to power bleaching with different gels

Effect of conventional and power office bleaching with diode laser and led light on enamel microhardness

An Environmental Scanning Electron Microscopy Evaluation on Comparison of Three Different Bleaching Agents using the Laser Activated in-Office Bleaching at Different Wavelengths

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