title: Clinical evaluation of the effectiveness of different bleaching therapies in vital teeth.
abstract: The aims of this in vivo study were to compare the effectiveness and color stability of at-home and in-office bleaching techniques and to evaluate whether the use of light sources can alter bleaching results. According to preestablished criteria, 40 patients were selected and randomly divided into four groups according to bleaching treatment: (1) at-home bleaching with 10% carbamide peroxide, (2) in-office bleaching with 35% hydrogen peroxide (HP) without a light source, (3) in-office bleaching with 35% HP with quartz-tungsten-halogen light, and (4) in-office bleaching with 35% HP with a light-emitting diode/laser. Tooth shade was evaluated using the VITA Classical Shade Guide before bleaching as well as after the first and third weeks of bleaching. Tooth shade was evaluated again using the same guide 1 and 6 months after the completion of treatment. The shade guide was arranged to yield scores that were used for statistical comparison. Statistical analysis using the Kruskal-Wallis test showed no significant differences among the groups for any time point (P > .01). There was no color rebound in any of the groups. The bleaching techniques tested were equally effective. Light sources are unnecessary to bleach teeth.
authors.affiliation: Department of Restorative Denistry, Faculty of Dentistry of Araçatuba, São Paulo State University, Araçatuba, SP, Brazil.
authors.forename: Leticia Cunha do Amaral Gonzaga de
authors.initials: LC
authors.lastname: Almeida
authors.forename: Heraldo
authors.initials: H
authors.lastname: Riehl
authors.forename: Paulo Henrique dos
authors.initials: PH
authors.lastname: Santos
authors.forename: Maria Lucia Marcal Mazza
authors.initials: ML
authors.lastname: Sundfeld
authors.forename: Andre Luiz Fraga
authors.initials: AL
authors.lastname: Briso
mesh_terms: D000293:Adolescent; D000328:Adult; D000077463:Carbamide Peroxide; D003116:Color; D005500:Follow-Up Studies; D006801:Humans; D006861:Hydrogen Peroxide / Q000627:therapeutic use; D007180:Incisor / Q000033:anatomy & histology / Q000187:drug effects / Q000528:radiation effects; D054023:Lasers, Semiconductor / Q000627:therapeutic use; D008029:Lighting / Q000295:instrumentation; D010545:Peroxides / Q000627:therapeutic use; D010789:Phototherapy / Q000295:instrumentation / Q000379:methods; D014073:Tooth Bleaching / Q000295:instrumentation / Q000379:methods*; D058205:Tooth Bleaching Agents / Q000627:therapeutic use; D014508:Urea / Q000031:analogs & derivatives / Q000627:therapeutic use; D055815:Young Adult
chemical_list: D010545:Peroxides; D058205:Tooth Bleaching Agents; D000077463:Carbamide Peroxide; D014508:Urea; D006861:Hydrogen Peroxide