Batista, G. R. [UNESP]Barcellos, D. C. [UNESP]Torres, C. R. G. [UNESP]Goto, E. H. [UNESP]Pucci, C. R. [UNESP]Borges, Alessandra Buhler [UNESP]2014-05-202014-05-202011-03-01Operative Dentistry. Indianapolis: Operative Dentistry Inc, v. 36, n. 2, p. 162-168, 2011.0361-7734http://hdl.handle.net/11449/22937The aim of this study was to assess the influence of manganese gluconate, a chemical activator of bleaching agents, at a concentration of 0.01% on the efficiency of a 10% carbamide peroxide-based bleaching agent. Forty bovine incisors were immersed in a 25% instant coffee solution for seven days and randomly divided into two groups. Group 1 was the control group and consisted of 10% carbamide peroxide-based bleaching gel only. Group 2 consisted of 10% carbamide peroxide-based bleaching gel and 0.01% manganese gluconate. Three readings of color were taken using the Vita Easy-shade spectrophotometer: the initial reading, a reading at seven days, and a reading at 14 days. Total color variation was calculated by Delta E*Lab. Data were submitted to the statistical t-test (5%), which showed that after seven days group 2 had a significant increase in the degree of tooth bleaching compared with group 1. The mean values (+/-SD) were 16.33 (+/-3.95) for group 1 and 19.29 (+/-4.97) for group 2. However, the results for group 1 and group 2 were similar after 14 days. Adding 0.01% manganese gluconate to 10% carbamide peroxide bleaching gel increased the degree of tooth bleaching after a seven-day treatment and did not influence the resulting shade after 14 days.162-168engArtigo10.2341/09-280-LWOS:000293677700006Acesso restrito3135367849609938696047005303790517540206528748500000-0003-4830-0400