Effect of dental pigmentation intensity on the transenamel and transdentinal penetration of hydrogen peroxide

Author(s)

Janaina Cardoso Moreira

• Document type: Master's Dissertation
• Press: Araçatuba. 2016-07-28.
• Institution: Universidade Estadual Paulista (Unesp). Faculdade de Odontologia. Araçatuba
• Defense date: 2016-07-18
• Advisor: André Luiz Fraga Briso; Vanessa Rahal

Abstract

This study aimed to evaluate the transenamel and transdentinal penetration of H202 applied to bovine teeth that were pigmented with black tea at different intensities. Groups division: G I – immersed for 6 days in distilled water; G II – immersed in an infusion of 1.6 g of black tea per 100 mL distilled water; G III – immersed in an infusion of 1.6 g black tea per 10 mL distilled water. To quantify the penetration of H202, the specimens were placed in artificial pulp chambers (APCs) and submitted to bleaching treatment with 38% H2O2, once per week for 3 weeks. After bleaching treatment, the acetate buffer solution of APCs with peroxidase enzyme was evaluated in a reflection spectrophotometer. The transenamel and transdentinal penetration of H2O2 and the L* values obtained in T1, T2, and T3 were subjected to KruskalWallis and Friedman statistical tests. At T1, the H2O2 diffusion in G I was higher than that in G II and G III. At the other evaluation times, the penetration values in G II and G III increased and remained similar. The L* values increased significantly in all groups at T1. At T2, the L values were higher in G I, and the values in G II and G III were similar to each other. At the end of the experiment, G III showed the lowest L* values. The pigmentation level did not affect the penetration of H2O2 through the enamel and dentin, and the bleaching agent effectively changed the color of the teeth. (AU)

• FAPESP's process: 14/11748-9 - Assessment of the effect of the dental pigmentation intensity in the trans-enamel and trans-dentinal penetration of hydrogen peroxide
• Grantee: Janaina Cardoso Moreira
• Support Opportunities: Scholarships in Brazil - Master