title: A study of in vivo degradation of two vital home bleaching gels.
abstract: This study investigated hydrogen peroxide (H2O2) concentration of two home bleaching gels, in their dispensing syringes and their degradation in vivo in intraoral bleaching trays. Two bleaching gels were studied, 7.5% hydrogen peroxide (HP) and 20% carbamide peroxide (CP). The concentration of H2O2 was determined in dispensing syringes. Twenty individuals were involved in this study. The gels were placed in trays of both arches and their degradation determined at 5, 10, 15, 20, 30, 40, 60 and 75 min. The concentrations of H2O2 in syringes were (HP) 8.12% and (CP) 7.95%. For the HP gel in custom-trays the concentration of H2O2 was 73% at 5 min and 42% after 75 min. In the 20% CP gel it was 75% at 5 min and 39% after 75 min. Activity decreased linearly up to 75 min, where the mean concentration of H2O2 exceeded 35% for the CP and HP gels.
authors.affiliation: School of Dentistry, Faculty of Medicine and Dentistry, Rúa Entrerríos, s/n. 15782 Santiago de Compostela, Spain. victorap@mundo-r.com
authors.forename: Victor
authors.initials: V
authors.lastname: Alonso De La Peña
authors.forename: Alfredo
authors.initials: A
authors.lastname: Rodriguez Carreira
authors.forename: Rubén
authors.initials: R
authors.lastname: Corral Aneiros
authors.forename: Monica
authors.initials: M
authors.lastname: López Ratón
authors.forename: Francisco
authors.initials: F
authors.lastname: Guitián Rivera
mesh_terms: D000077463:Carbamide Peroxide; D002863:Chromogenic Compounds; D004867:Equipment Design; D005782:Gels; D006801:Humans; D006861:Hydrogen Peroxide / Q000032:analysis / Q000737:chemistry; D010084:Oxidation-Reduction; D010545:Peroxides / Q000032:analysis / Q000737:chemistry; D013594:Syringes; D013997:Time Factors; D014073:Tooth Bleaching / Q000295:instrumentation; D058205:Tooth Bleaching Agents / Q000032:analysis / Q000737:chemistry*; D014508:Urea / Q000031:analogs & derivatives / Q000032:analysis / Q000737:chemistry
chemical_list: D002863:Chromogenic Compounds; D005782:Gels; D010545:Peroxides; D058205:Tooth Bleaching Agents; D000077463:Carbamide Peroxide; D014508:Urea; D006861:Hydrogen Peroxide