IADR Abstract Archives
Evaluation of a new bleaching agent for professional use containing trimetaphosphate and fluoride
Objectives: This study evaluated the addition of sodium trimetaphosphate (TMP) and/or sodium fluoride (NaF) or calcium gluconate (CaGlu) to a 35% hydrogen peroxide (H2O2) bleaching gel on the color change, enamel microhardness and transamelodentinal diffusion.
Methods: Bovine enamel/dentin disks (n=216) were divided according to the bleaching gel: 35% H2O2; 35% H2O2 + 0.05% NaF; 35% H2O2 + 0.25% TMP; 35% H2O2 + 0.05% NaF + 0.25% TMP; 35% H2O2 + 0.1% NaF + 1% TMP and 35% H2O2 + 2% CaGlu. The bleaching gels were applied thrice (40 min/session) at the intervals of 7 days between each application. Then, the color change, percentage of surface hardness loss (%SH), cross-sectional hardness (ΔKHN) and transamelodentinal diffusion of H2O2 were determined. The data were submitted to ANOVA followed by the Student-Newman-Keuls test (p<0.05).
Results: All bleaching gels showed significant color changes after treatment (p<0.001). Mineral loss (%SH and ΔKHN) and H2O2 diffusion were lower for 35% H2O2/0.1% NaF/1% TMP, and 35% H2O2/2% CaGlu showed higher values, compared to the other groups (p <0.001)
Conclusions: It was concluded that the addition of NaF/TMP in-office bleaching did not interfere in the bleaching efficacy, and reduced enamel demineralization and H2O2 transamelodentinal diffusion.
Methods: Bovine enamel/dentin disks (n=216) were divided according to the bleaching gel: 35% H2O2; 35% H2O2 + 0.05% NaF; 35% H2O2 + 0.25% TMP; 35% H2O2 + 0.05% NaF + 0.25% TMP; 35% H2O2 + 0.1% NaF + 1% TMP and 35% H2O2 + 2% CaGlu. The bleaching gels were applied thrice (40 min/session) at the intervals of 7 days between each application. Then, the color change, percentage of surface hardness loss (%SH), cross-sectional hardness (ΔKHN) and transamelodentinal diffusion of H2O2 were determined. The data were submitted to ANOVA followed by the Student-Newman-Keuls test (p<0.05).
Results: All bleaching gels showed significant color changes after treatment (p<0.001). Mineral loss (%SH and ΔKHN) and H2O2 diffusion were lower for 35% H2O2/0.1% NaF/1% TMP, and 35% H2O2/2% CaGlu showed higher values, compared to the other groups (p <0.001)
Conclusions: It was concluded that the addition of NaF/TMP in-office bleaching did not interfere in the bleaching efficacy, and reduced enamel demineralization and H2O2 transamelodentinal diffusion.