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KMID : 0988420020140020178
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Journal of Dental Science (C.N.U.)
2002 Volume.14 No. 2 p.178 ~ p.186
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Bleaching Effect of Carbamide Peroxide Gel on Discolored Nonvital Teeth
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Abstract
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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 ws 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 12days. To evaluate the bleaching effect, the color change of the crowns were measured at 1, 2, 3, 4, 7 and 15days 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. E^* value higher than 3 was shown after 3days of bleaching with 10% carbamide peroxide gel, 1day with 15% carbamide peroxide gel, 4days with mixture sodium perborate and distilled water and 4days 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.
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