Open Access, Peer-reviewed
eISSN 2234-7666
    J Korean Acad Conserv Dent. 2002 Jul;27(4):441-447. Korean.
    Published online Jul 31, 2002.
    https://doi.org/10.5395/JKACD.2002.27.4.441
    Copyright © 2002 Korean Academy of Conservative Dentistry
    Original Article

    Bleaching effect of carbamide peroxide gel on discolored nonvital teeth

    Sun-Ah Park, Sun-Ho Kim, Yun-Chan Hwang, Byung-Ju Oh, Chang Youn, Yeong-Joon Park,* Sun-Wa Jeong,** In-Nam Hwang and Won-Mann Oh
      • Department of Conservative Dentistry, College of Dentistry, Korea.
      • *Department of Dental Materials, Dental Science Research Institute, Chonnam National University, Korea.
      • **Department of Dentistry, College of Medicine, Seonam University, Korea.

    This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

    Abstract

    The bleaching of discolored nonvital teeth is conservative treatment that satisfy the cosmetic desire. The most common method for this treatment, walking bleaching, is using 30% hydrogen peroxide and sodium perborate.

    Many alternatives are suggested for preventing the external cervical root resorption that is the common complication of the nonvital teeth bleaching with 30% hydrogen peroxide.

    The same extent of oxidation reactions as that resulted by the bleaching with the application of 30% hydrogen peroxide and sodium perborate can also be acquired more safely by materials that contain 10% carbamide peroxide, used primarily for the bleaching of vital teeth. Therefore, this study was performed to evaluate the efficacy of 10% and 15% carbamide peroxide bleaching gel in nonvatal teeth bleaching.

    The internal bleaching of intentionally discolored teeth was performed in vitro with 10% carbamide peroxide (Group 1), 15% carbamide peroxide (Group 2), mixture of distilled water and sodium perborate (Group 3), and mixture of 30% hydrogen peroxide and sodium perborate (Group 4). The bleaching materials were refreshed following 3, 6, 9 and 12 days. To evaluate the bleaching effect, the color change of the crowns was measured at 1, 2, 3, 4, 7 and 15 days of bleaching using the colorimeter.

    The results were as follows :

    1. L* and ΔE* values were increased with time in all bleaching agents(p<0.01).

    2. There was no significant difference in L* and ΔE* value among bleaching agents.

    3. ΔE* value higher than 3 was shown after 3 days of bleaching with 10% carbamide peroxide gel, 1 day with 15% carbamide peroxide gel, 4 days with mixture sodium perborate and distilled water and 4 days with mixture sodium perborate and 30% hydrogen peroxide, respectively.

    These results revealed that the use of 10% and 15% carbamide peroxide bleaching gel in non-vital teeth bleaching is as effective as mixture of distilled water and sodium perborate and mixture of 30% hydrogen peroxide and sodium perborate. Accordingly, carbamide peroxide could be used clinically to bleach discolored non-vital teeth.

    Keywords
    Bleaching; Nonvital teeth; Carbamide peroxide; Sodium perborate

    Figures

    Fig. 1
    The L* values of the teeth are shown.

    Fig. 2
    The total color change of the teeth are shown.

    Tables

    Table 1
    Description of the experimental groups

    Table 2
    Mean color parameters(L*, a*, b*) and total color changes(ΔE*) before and after bleaching procedure for 15 days Mean(S.D), n=7

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    MeSH Terms
    Borates
    Cosmetics
    Crowns
    Hydrogen
    Hydrogen Peroxide
    Intention
    Peroxides
    Root Resorption
    Sodium
    Tooth
    Tooth Bleaching
    Tooth, Nonvital
    Urea
    Walking
    Water
    Metrics
    Share
    Figures
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    Tables
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