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Microhardness of demineralized enamel following home bleaching and laser-assisted in office bleaching.

Ghanbarzadeh M, Ahrari F, Akbari M, Hamzei H - J Clin Exp Dent (2015)

Bottom Line: Microhardness decreased significantly following both home bleaching and laser-assisted in-office bleaching (p<0.05).There were no significant differences in hardness values among the two groups either before (p=0.131) or after (p=0.182) the bleaching procedures.Key words:White spot lesion, bleaching, laser, microhardness, demineralized enamel, home bleaching, in-office bleaching.

View Article: PubMed Central - PubMed

Affiliation: DDS MS, Assistant Professor of Orthodontics, Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.

ABSTRACT

Background: There is little data regarding the effect of tooth whitening on microhardness of white spot lesions. This study was conducted to investigate the effect of home-bleaching and laser-assisted in-office bleaching on microhardness of demineralized enamel.

Material and methods: Forty bovine incisors were selected and immersed in a demineralizing solution for 12 weeks to induce white spot lesions. Enamel blocks were prepared and randomly assigned to two groups of 20 each. The first group underwent home bleaching with 15% carbamide peroxide which was applied for 8 hours a day over a period of 15 days. In the second group, in-office bleaching was performed by 40% hydrogen peroxide and powered by irradiation from an 810 nm gallium-aluminum-arsenide (GaAlAs) diode laser (CW, 2W). This process was performed for 3 sessions every seven days, in 15 days. The specimens were stored in Fusayama Meyer artificial saliva during the experiment. Surface microhardness was assessed before and after the bleaching therapies in both groups.

Results: Microhardness decreased significantly following both home bleaching and laser-assisted in-office bleaching (p<0.05). There were no significant differences in hardness values among the two groups either before (p=0.131) or after (p=0.182) the bleaching procedures.

Conclusions: Tooth whitening through home bleaching or laser-assisted in-office bleaching can result in a significant reduction in microhardness of white spot lesions. Therefore, it is suggested to take protective measures on bleached demineralized enamel. Key words:White spot lesion, bleaching, laser, microhardness, demineralized enamel, home bleaching, in-office bleaching.

No MeSH data available.


Related in: MedlinePlus

Mounting the specimens for making special trays for home bleaching process.
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Figure 1: Mounting the specimens for making special trays for home bleaching process.

Mentions: After measuring the initial VHN, the specimens in the first group underwent home bleaching. For this purpose, the resinous blocks were mounted in plaster so that an ovoid arch was formed from each of the 8-10 specimens (Fig 1), simulating upper dentition. The arch was then covered by two layers of pink wax to allow making a special tray. An alginate impression was then taken and a bleaching tray was fabricated for each dentition.


Microhardness of demineralized enamel following home bleaching and laser-assisted in office bleaching.

Ghanbarzadeh M, Ahrari F, Akbari M, Hamzei H - J Clin Exp Dent (2015)

Mounting the specimens for making special trays for home bleaching process.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4554242&req=5

Figure 1: Mounting the specimens for making special trays for home bleaching process.
Mentions: After measuring the initial VHN, the specimens in the first group underwent home bleaching. For this purpose, the resinous blocks were mounted in plaster so that an ovoid arch was formed from each of the 8-10 specimens (Fig 1), simulating upper dentition. The arch was then covered by two layers of pink wax to allow making a special tray. An alginate impression was then taken and a bleaching tray was fabricated for each dentition.

Bottom Line: Microhardness decreased significantly following both home bleaching and laser-assisted in-office bleaching (p<0.05).There were no significant differences in hardness values among the two groups either before (p=0.131) or after (p=0.182) the bleaching procedures.Key words:White spot lesion, bleaching, laser, microhardness, demineralized enamel, home bleaching, in-office bleaching.

View Article: PubMed Central - PubMed

Affiliation: DDS MS, Assistant Professor of Orthodontics, Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.

ABSTRACT

Background: There is little data regarding the effect of tooth whitening on microhardness of white spot lesions. This study was conducted to investigate the effect of home-bleaching and laser-assisted in-office bleaching on microhardness of demineralized enamel.

Material and methods: Forty bovine incisors were selected and immersed in a demineralizing solution for 12 weeks to induce white spot lesions. Enamel blocks were prepared and randomly assigned to two groups of 20 each. The first group underwent home bleaching with 15% carbamide peroxide which was applied for 8 hours a day over a period of 15 days. In the second group, in-office bleaching was performed by 40% hydrogen peroxide and powered by irradiation from an 810 nm gallium-aluminum-arsenide (GaAlAs) diode laser (CW, 2W). This process was performed for 3 sessions every seven days, in 15 days. The specimens were stored in Fusayama Meyer artificial saliva during the experiment. Surface microhardness was assessed before and after the bleaching therapies in both groups.

Results: Microhardness decreased significantly following both home bleaching and laser-assisted in-office bleaching (p<0.05). There were no significant differences in hardness values among the two groups either before (p=0.131) or after (p=0.182) the bleaching procedures.

Conclusions: Tooth whitening through home bleaching or laser-assisted in-office bleaching can result in a significant reduction in microhardness of white spot lesions. Therefore, it is suggested to take protective measures on bleached demineralized enamel. Key words:White spot lesion, bleaching, laser, microhardness, demineralized enamel, home bleaching, in-office bleaching.

No MeSH data available.


Related in: MedlinePlus