title: Intracoronal bleaching of discolored non-vital teeth.
abstract: This clinical study compared the effectiveness of bleaching non-vital teeth with an open pulp chamber during bleaching using 10% carbamide peroxide compared to the modified walking bleach technique and extracoronal bleaching. Sixty discolored, non-vital teeth were treated. They were divided into three groups. Each group was treated with one of the bleaching materials and methods: extracoronally using 10% carbamide peroxide for two weeks as negative control (Group A), intracoronally using sodium perborate mixed with 3% hydrogen peroxide (modified walking bleach technique) (Rotstein, Mor & Friedman, 1993) for four weeks (Group B) and intracoronally and extracoronally using 10% carbamide peroxide for two weeks (Group C) (Liebenberg, 1997). Tooth color was measured at baseline, (BL), immediately post-bleaching (IP) and six months post-bleaching (SP) with a colorimeter (Castor, Sigma, Germany) using a tooth-positioning jig. The color was determined according to the CIELAB system, which records lightness as L* and chromaticity coordinates as a* and b*. The difference in L* and b* among the three groups was significant between BL and IP examination. The post-bleaching, whitening effect in Group C was significantly better, but after six months, in Group C, it was as effective as in Group B.
authors.affiliation: Charité, Humboldt-University Berlin, Germany. mozhgan.bizhang@charite.de
authors.forename: Mozhgan
authors.initials: M
authors.lastname: Bizhang
authors.forename: Anke
authors.initials: A
authors.lastname: Heiden
authors.forename: Uwe
authors.initials: U
authors.lastname: Blunck
authors.forename: Stefan
authors.initials: S
authors.lastname: Zimmer
authors.forename: Rainer
authors.initials: R
authors.lastname: Seemann
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Roulet
mesh_terms: D000328:Adult; D001881:Borates / Q000627:therapeutic use; D000077463:Carbamide Peroxide; D003742:Dental Devices, Home Care; D004338:Drug Combinations; D005260:Female; D006801:Humans; D006861:Hydrogen Peroxide / Q000627:therapeutic use; D008297:Male; D016877:Oxidants / Q000627:therapeutic use; D010545:Peroxides / Q000627:therapeutic use; D018709:Statistics, Nonparametric; D013997:Time Factors; D014073:Tooth Bleaching / Q000379:methods*; D014075:Tooth Discoloration / Q000188:drug therapy*; D019553:Tooth, Nonvital; D014508:Urea / Q000031:analogs & derivatives / Q000627:therapeutic use
chemical_list: D001881:Borates; D004338:Drug Combinations; D016877:Oxidants; D010545:Peroxides; D000077463:Carbamide Peroxide; D014508:Urea; D006861:Hydrogen Peroxide; C027707:sodium perborate