title: One-year clinical evaluation of the efficacy of a new daytime at-home bleaching technique.
abstract: The aim of this study was to compare the clinical efficacy and side effects of a new daytime at-home bleaching technique (28% carbamide peroxide [CP] gel) with the overnight application of 10% CP and to determine the change of tooth color 1-year post-treatment. Twenty healthy volunteers were assigned to one of two sample groups of 10. All participants employed one of the two at-home bleaching systems: (1) the new daytime at-home bleaching system including 28% CP gel with a non-custom-fit tray (Meta Tray, Remedent, Deurle, Belgium) for 20 minutes, and (b) the conventional overnight at-home bleaching system with a 10% CP gel and a custom-fit tray (Opalescence PF, Ultradent, South Jordan, UT, USA) for 6 to 8 hours. Digital images and CIE (International Commission on Illumination) L*, a*, and b* spectrophotometric measurements were taken at baseline, after the bleaching treatment and 1-year post-treatment. Tooth and gingival sensitivity was measured with a specially designed 4-point scale. Significant differences were found in L*, a*, and b* values, between initial and post-treatment, for both bleaching systems (p < 0.05). However, no significant difference was detected between post-treatment and 1-year follow-up. The bleaching effectiveness of Opalescence PF was found to be superior to that of Meta Tray, considering the color parameter of DeltaE (p < 0.05). Meta Tray provoked less tooth sensitivity (p < 0.05), however gingival sensitivity appeared more in this group (p < 0.05). Within the limitations of this study, it can be concluded that the new daytime at-home bleaching system tested (Meta Tray) produced significant bleaching effects. However, the clinical efficacy of the overnight bleaching system was found to be superior to the daytime at-home bleaching system evaluated in this study. The whitening effect remained similar 1-year after the bleaching treatment for both at-home bleaching systems. CLINICAL SIGNIFICANCE Although the new daytime at-home bleaching system tested exhibited significant bleaching effects, overnight bleaching with a 10% CP gel resulted in a higher bleaching effectiveness than this new system. Although the participants using the new bleaching system exhibited less tooth sensitivity probably because of the reduced contact time of bleaching gel with tooth surfaces, the application of the bleaching agent with a non-customized tray provoked more gingival sensitivity in this group.
authors.affiliation: Department of Restorative Dentistry and Endodontics, School of Dentistry, Ege University, Izmir, Turkey. murat.turkun@ege.edu.tr
authors.forename: Murat
authors.initials: M
authors.lastname: Türkün
authors.forename: Esra Uzer
authors.initials: EU
authors.lastname: Celik
authors.forename: Akin
authors.initials: A
authors.lastname: Aladağ
authors.forename: Necmi
authors.initials: N
authors.lastname: Gökay
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D000077463:Carbamide Peroxide; D003124:Colorimetry; D003742:Dental Devices, Home Care; D003807:Dentin Sensitivity / Q000139:chemically induced; D005500:Follow-Up Studies; D006801:Humans; D016877:Oxidants / Q000008:administration & dosage*; D010545:Peroxides / Q000008:administration & dosage*; D018709:Statistics, Nonparametric; D014073:Tooth Bleaching / Q000009:adverse effects / Q000295:instrumentation* / Q000379:methods*; D014508:Urea / Q000008:administration & dosage / Q000031:analogs & derivatives*; D055815:Young Adult
chemical_list: D016877:Oxidants; D010545:Peroxides; D000077463:Carbamide Peroxide; D014508:Urea