Bleaching effect of carbamide peroxide gel on discolored nonvital teeth.
10.5395/JKACD.2002.27.4.441
- Author:
Sun Ah PARK
1
;
Sun Ho KIM
;
Yun Chan HWANG
;
Byung Ju OH
;
Chang YOUN
;
Yeong Joon PARK
;
Sun Wa JEONG
;
In Nam HWANG
;
Won Mann OH
Author Information
1. Department of Conservative Dentistry, College of Dentistry, Korea.
- Publication Type:In Vitro ; Original Article
- Keywords:
Bleaching;
Nonvital teeth;
Carbamide peroxide;
Sodium perborate
- MeSH:
Borates;
Cosmetics;
Crowns;
Hydrogen;
Hydrogen Peroxide;
Intention;
Peroxides;
Root Resorption;
Sodium;
Tooth;
Tooth Bleaching;
Tooth, Nonvital;
Urea;
Walking;
Water
- From:Journal of Korean Academy of Conservative Dentistry
2002;27(4):441-447
- CountryRepublic of Korea
- Language:Korean
-
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 DeltaE* values were increased with time in all bleaching agents(p<0.01). 2. There was no significant difference in L* and DeltaE* value among bleaching agents. 3. DeltaE* 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.
