Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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BLEACHING EFFECT OF CARBAMIDE PEROXIDE GEL ON DISCOLORED NONVITAL TEETH

변색 실활치에 대한 carbamide peroxide gel의 표백효과

  • Park, Sun-Ah (Dept. of Conservative Dentistry, College of Dentistry, Dental Science Research Institute, Chonnam Natl. Uni.) ;
  • Kim, Sun-Ho (Dept. of Conservative Dentistry, College of Dentistry, Dental Science Research Institute, Chonnam Natl. Uni.) ;
  • Hwang, Yun-Chan (Dept. of Conservative Dentistry, College of Dentistry, Dental Science Research Institute, Chonnam Natl. Uni.) ;
  • Oh, Byung-Ju (Dept. of Conservative Dentistry, College of Dentistry, Dental Science Research Institute, Chonnam Natl. Uni.) ;
  • Youn, Chang (Dept. of Conservative Dentistry, College of Dentistry, Dental Science Research Institute, Chonnam Natl. Uni.) ;
  • Park, Yeong-Joon (Dept. of Dental Materials, Dental Science Research Institute, Chonnam Natl. Uni.) ;
  • Jeong, Sun-Wa (Dept. of Dentistry, College of Medicine, Seonam University) ;
  • Hwang, In-Nam (Dept. of Conservative Dentistry, College of Dentistry, Dental Science Research Institute, Chonnam Natl. Uni.) ;
  • Oh, Won-Mann (Dept. of Conservative Dentistry, College of Dentistry, Dental Science Research Institute, Chonnam Natl. Uni.)
  • 박선아 (전남대학교 치과대학 보존학교실, 치의학연구소) ;
  • 김선호 (전남대학교 치과대학 보존학교실, 치의학연구소) ;
  • 황윤찬 (전남대학교 치과대학 보존학교실, 치의학연구소) ;
  • 오병주 (전남대학교 치과대학 보존학교실, 치의학연구소) ;
  • 윤창 (전남대학교 치과대학 보존학교실, 치의학연구소) ;
  • 박영준 (전남대학교 치과대학 치과재료학교실, 치의학연구소) ;
  • 정선와 (서남대학교 의과대학 치과학교실) ;
  • 황인남 (전남대학교 치과대학 보존학교실, 치의학연구소) ;
  • 오원만 (전남대학교 치과대학 보존학교실, 치의학연구소)
  • Published : 2002.07.01
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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 $\Delta$E$^*$ values were increased with time in all bleaching agents (p<0.01). 2. There was no significant difference in L$^*$ and $\Delta$E$^*$ value among bleaching agents. 3. $\Delta$E$^*$ value higher than 3 was shown after 3 days of bleaching with 10% carbamide peroxide gel, 1 day with 15% carbamide poroxide gel, 4 days with mixture sodium perborate and distilled water and 4 days with mixture sodium perborate and 30% hydrogen peroride, 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

References

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