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Evaluation of Extraradicular Diffusion of Hydrogen Peroxide during Intracoronal Bleaching Using Different Bleaching Agents.

Rokaya ME, Beshr K, Hashem Mahram A, Samir Pedir S, Baroudi K - Int J Dent (2015)

Bottom Line: The results were analyzed using the ANOVA and Tukey's test.Results.Conclusion.

View Article: PubMed Central - PubMed

Affiliation: Department of Endodontics, Faculty of Dentistry, Al-Azhar University, Assiut, Egypt.

ABSTRACT
Objectives. Extra radicular diffusion of hydrogen peroxide associated with intracoronal teeth bleaching was evaluated. Methods. 108 intact single rooted extracted mandibular first premolars teeth were selected. The teeth were instrumented with WaveOne system and obturated with gutta percha and divided into four groups (n = 27) according to the bleaching materials used. Each main group was divided into three subgroups (n = 9) according to the time of extra radicular hydrogen peroxide diffusion measurements at 1, 7, and 14 days: group 1 (35% hydrogen peroxide), group 2 (35% carbamide peroxide), group 3 (sodium perborate-30% hydrogen peroxide mixture), and group 4 (sodium perborate-water mixture). Four cemental dentinal defects were prepared just below the CEJ on each root surface. The amount of hydrogen peroxide that leached out was evaluated after 1, 7, and 14 days by spectrophotometer analysis. The results were analyzed using the ANOVA and Tukey's test. Results. Group 1 showed highest extra radicular diffusion, followed by group 3 and group 2, while group 4 showed the lowest mean extra radicular diffusion. Conclusion. Carbamide peroxide and sodium perborate-water mixture are the most suitable bleaching materials used for internal bleaching due to their low extra radicular diffusion of hydrogen peroxide.

No MeSH data available.


A schematic diagram showing KMnO4 having a standard spectrum (absorbance 0.871 A) at wavelength 525 nm.
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fig2: A schematic diagram showing KMnO4 having a standard spectrum (absorbance 0.871 A) at wavelength 525 nm.

Mentions: In this study we used titration method of permanganate and hydrogen peroxide according to the following equation [13](1)2MnO4−+5H2O2++6H+⟶2Mn2++5O2+8H2OThe pink color of permanganate would be changed when reacted with peroxides; the color disappears according to the concentration of peroxide. The reaction is fast and does not need time or temperature for progression. The amount of radicular peroxide was measured using the UV-visible spectrophotometer (SpectraMax 1601, Molecular Devices Corp., Sunnyvale, CA, USA) at a wavelength of 480 nm (at room temperature), utilizing the potassium permanganate (KMnO4) as peroxide indicator (redox reaction) and (KMnO4) having a standard spectrum (absorbance 0.871 A) at wavelength 525 nm (Figure 2).


Evaluation of Extraradicular Diffusion of Hydrogen Peroxide during Intracoronal Bleaching Using Different Bleaching Agents.

Rokaya ME, Beshr K, Hashem Mahram A, Samir Pedir S, Baroudi K - Int J Dent (2015)

A schematic diagram showing KMnO4 having a standard spectrum (absorbance 0.871 A) at wavelength 525 nm.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4516840&req=5

fig2: A schematic diagram showing KMnO4 having a standard spectrum (absorbance 0.871 A) at wavelength 525 nm.
Mentions: In this study we used titration method of permanganate and hydrogen peroxide according to the following equation [13](1)2MnO4−+5H2O2++6H+⟶2Mn2++5O2+8H2OThe pink color of permanganate would be changed when reacted with peroxides; the color disappears according to the concentration of peroxide. The reaction is fast and does not need time or temperature for progression. The amount of radicular peroxide was measured using the UV-visible spectrophotometer (SpectraMax 1601, Molecular Devices Corp., Sunnyvale, CA, USA) at a wavelength of 480 nm (at room temperature), utilizing the potassium permanganate (KMnO4) as peroxide indicator (redox reaction) and (KMnO4) having a standard spectrum (absorbance 0.871 A) at wavelength 525 nm (Figure 2).

Bottom Line: The results were analyzed using the ANOVA and Tukey's test.Results.Conclusion.

View Article: PubMed Central - PubMed

Affiliation: Department of Endodontics, Faculty of Dentistry, Al-Azhar University, Assiut, Egypt.

ABSTRACT
Objectives. Extra radicular diffusion of hydrogen peroxide associated with intracoronal teeth bleaching was evaluated. Methods. 108 intact single rooted extracted mandibular first premolars teeth were selected. The teeth were instrumented with WaveOne system and obturated with gutta percha and divided into four groups (n = 27) according to the bleaching materials used. Each main group was divided into three subgroups (n = 9) according to the time of extra radicular hydrogen peroxide diffusion measurements at 1, 7, and 14 days: group 1 (35% hydrogen peroxide), group 2 (35% carbamide peroxide), group 3 (sodium perborate-30% hydrogen peroxide mixture), and group 4 (sodium perborate-water mixture). Four cemental dentinal defects were prepared just below the CEJ on each root surface. The amount of hydrogen peroxide that leached out was evaluated after 1, 7, and 14 days by spectrophotometer analysis. The results were analyzed using the ANOVA and Tukey's test. Results. Group 1 showed highest extra radicular diffusion, followed by group 3 and group 2, while group 4 showed the lowest mean extra radicular diffusion. Conclusion. Carbamide peroxide and sodium perborate-water mixture are the most suitable bleaching materials used for internal bleaching due to their low extra radicular diffusion of hydrogen peroxide.

No MeSH data available.