TODENTJ-25-03-2019_TODENTJ-10-438 1553506558 Bentham Open doi@benthamopen.net Bentham Open The Open Dentistry Journal TODENTJ 1874-2106 08 31 2016 10 1 Juliana do Carmo Públio Maria Beatriz Freitas D’Arce Anderson Catelan Gláucia Maria Bovi Ambrosano Flávio Henrique Baggio Aguiar José Roberto Lovadino Débora Alves Nunes Leite Lima This study evaluated the influence of different enamel thicknesses and bleaching agents on treatment efficacy in-depth by spectrophotometry color analysis. Eighty bovine dental fragments were previously stained in black tea solution and randomly assigned into eight groups (n=10), 1.75mm dentin thickness and different enamel thicknesses as follows: 0.5mm, 1.0mm planned, 1.0mm unplanned (aprismatic enamel), and absence of enamel. The 10% carbamide peroxide (CP) and 35% hydrogen peroxide (HP) bleaching gels were applied on the enamel surface following the manufacturer's recommendations. Color of underlying dentin was evaluated at four times: after staining with tea (baseline) and after each one of the three weeks of bleaching treatment, by CIE L*a*b* system using reflectance spectrophotometer (CM 700d, Konica Minolta). The ΔE, ΔL, Δa, and Δb values were recorded and subjected to repeated measures ANOVA and Tukey’s test (α=0.05). The results showed an increase on lightness (L*), with decreased redness (a*) and yellowness (b*). At first and second week, bleaching with CP showed higher whitening effectiveness compared to bleaching with HP and the presence of aprismatic enamel significantly reduced ΔE for bleaching with CP. After three weeks of bleaching, few differences were observed between CP and HP groups, and outer enamel layer caused no influence on bleaching effectiveness. Overall, both at-home and in-office bleaching treatments were effective and the presence of aprismatic enamel did not interfere on the whitening efficacy. 08 31 2016 438 445 TODENTJ-10-438 1 10.2174/crossmark_policy opendentistryjournal.com benthamopen.com true Peer Reviewed Single blind Checked with iThenticate 2015-03-24 2016-07-12 2016-08-10 2016-08-31 https://creativecommons.org/licenses/by/4.0/legalcode 10.2174/1874210601610010438 1553506558 https://opendentistryjournal.com/VOLUME/10/PAGE/438/ https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-438/TODENTJ-10-438.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-438/TODENTJ-10-438.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-438/TODENTJ-10-438.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-438/TODENTJ-10-438.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-438/TODENTJ-10-438.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-438/TODENTJ-10-438.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-438/TODENTJ-10-438.pdf https://opendentistryjournal.com/contents/volumes/V10/TODENTJ-10-438/TODENTJ-10-438.xml J. 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