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Extraradicular diffusion of hydrogen peroxide and pH changes associated with intracoronal bleaching of discoloured teeth using different bleaching agents.
Int Endod J. 2004 Jul; 37(7):500-6.IE

Abstract

AIM

To evaluate the extraradicular pH and hydrogen peroxide (HP) diffusion when either 35% carbamide peroxide (CP), 35% HP or sodium perborate (SP) is used for intracoronal bleaching of artificially discoloured teeth.

METHODOLOGY

Single rooted extracted human premolars were stained with whole blood cells. After shaping and cleaning, they were root filled and a base cement placed 1 mm below the buccal cementoenamel junction (CEJ). Four cemental defects were prepared just below the CEJ on each root surface. The teeth were randomly divided into four groups of 11 specimens, and intracoronally bleached using CP, HP, SP or distilled water (CL). Each tooth was suspended in a vial of distilled water and bleached for 7 days. The pH of the extraradicular distilled water was tested at 0, 1, 2 and 7 days and the HP that diffused through the root quantified using the Ferrous Oxidation-Xylenol Orange 2 Assay. The results were analysed using the one-way anova and Scheffe tests.

RESULTS

Carbamide peroxide produced the greatest increase and HP the least pH change (P < 0.05 except day 1), SP was intermediate. From day 1 onwards, radicular diffusion of HP was greatest with HP and least with CP (P < 0.01), again SP was intermediate. There was no significant difference between CP and SP.

CONCLUSIONS

Carbamide peroxide had very low levels of extraradicular diffusion of HP, in the presence of cemental defects. It could be an alternative to the other intracoronal bleaching agents.

Authors+Show Affiliations

Faculty of Dentistry, National University of Singapore, Singapore.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15189441

Citation

Lee, G P., et al. "Extraradicular Diffusion of Hydrogen Peroxide and pH Changes Associated With Intracoronal Bleaching of Discoloured Teeth Using Different Bleaching Agents." International Endodontic Journal, vol. 37, no. 7, 2004, pp. 500-6.
Lee GP, Lee MY, Lum SO, et al. Extraradicular diffusion of hydrogen peroxide and pH changes associated with intracoronal bleaching of discoloured teeth using different bleaching agents. Int Endod J. 2004;37(7):500-6.
Lee, G. P., Lee, M. Y., Lum, S. O., Poh, R. S., & Lim, K. C. (2004). Extraradicular diffusion of hydrogen peroxide and pH changes associated with intracoronal bleaching of discoloured teeth using different bleaching agents. International Endodontic Journal, 37(7), 500-6.
Lee GP, et al. Extraradicular Diffusion of Hydrogen Peroxide and pH Changes Associated With Intracoronal Bleaching of Discoloured Teeth Using Different Bleaching Agents. Int Endod J. 2004;37(7):500-6. PubMed PMID: 15189441.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Extraradicular diffusion of hydrogen peroxide and pH changes associated with intracoronal bleaching of discoloured teeth using different bleaching agents. AU - Lee,G P, AU - Lee,M Y, AU - Lum,S O Y, AU - Poh,R S C, AU - Lim,K-C, PY - 2004/6/11/pubmed PY - 2004/7/13/medline PY - 2004/6/11/entrez SP - 500 EP - 6 JF - International endodontic journal JO - Int Endod J VL - 37 IS - 7 N2 - AIM: To evaluate the extraradicular pH and hydrogen peroxide (HP) diffusion when either 35% carbamide peroxide (CP), 35% HP or sodium perborate (SP) is used for intracoronal bleaching of artificially discoloured teeth. METHODOLOGY: Single rooted extracted human premolars were stained with whole blood cells. After shaping and cleaning, they were root filled and a base cement placed 1 mm below the buccal cementoenamel junction (CEJ). Four cemental defects were prepared just below the CEJ on each root surface. The teeth were randomly divided into four groups of 11 specimens, and intracoronally bleached using CP, HP, SP or distilled water (CL). Each tooth was suspended in a vial of distilled water and bleached for 7 days. The pH of the extraradicular distilled water was tested at 0, 1, 2 and 7 days and the HP that diffused through the root quantified using the Ferrous Oxidation-Xylenol Orange 2 Assay. The results were analysed using the one-way anova and Scheffe tests. RESULTS: Carbamide peroxide produced the greatest increase and HP the least pH change (P < 0.05 except day 1), SP was intermediate. From day 1 onwards, radicular diffusion of HP was greatest with HP and least with CP (P < 0.01), again SP was intermediate. There was no significant difference between CP and SP. CONCLUSIONS: Carbamide peroxide had very low levels of extraradicular diffusion of HP, in the presence of cemental defects. It could be an alternative to the other intracoronal bleaching agents. SN - 0143-2885 UR - https://www.unboundmedicine.com/medline/citation/15189441/Extraradicular_diffusion_of_hydrogen_peroxide_and_pH_changes_associated_with_intracoronal_bleaching_of_discoloured_teeth_using_different_bleaching_agents_ L2 - https://onlinelibrary.wiley.com/resolve/openurl?genre=article&amp;sid=nlm:pubmed&amp;issn=0143-2885&amp;date=2004&amp;volume=37&amp;issue=7&amp;spage=500 DB - PRIME DP - Unbound Medicine ER -