In situ effect of a sodium bicarbonate solution on enamel after simulation of endogenous dental erosion.

Author(s)

Danielle Cristine Furtado Messias

• Document type: Doctoral Thesis
• Press: Ribeirão Preto.
• Institution: Universidade de São Paulo (USP). Faculdade de Odontologia de Ribeirão Preto (PCARP/BC)
• Defense date: 2010-02-10

Examining board members

Monica Campos Serra; André Luiz Fraga Briso; Silmara Aparecida Milori Corona; Fernando Carlos Hueb de Menezes; Cinthia Pereira Machado Tabchoury

• Advisor: Monica Campos Serra; Cecilia Pedroso Turssi

Abstract

One of the recommended measures to control dental erosion of intrinsic origin is the oral rinse with sodium bicarbonate solution, which has been suggested to neutralize the gastric acid regurgitated into the oral cavity. However, the efficacy of this prescription has not yet been proved. Therefore, the aim of this study was to evaluate in situ the effect of a sodium bicarbonate rinse in the control of dental erosion in enamel exposed to gastric acid-like solution. This study comprised two experimental legs. After a 2-day lead-in period, fourteen volunteers wore palatal devices containing two polished, sterilized enamel slabs. Throughout the experimental period of 5-d, one of the two specimens was exposed twice daily extra-orally to hydrochloric acid solution (0,01 M, pH=2) for 2 min. Immediately after, devices were reinserted in the mouth and volunteers rinsed their oral cavity with a sodium bicarbonate solution or deionized water for 60s. In the second leg of this study, after a 2-day washout period, appliances were refilled with a new set of enamel specimens and participants were crossed over to receive the alternate rinse. The wear depth accessed using optical profilometry and Knoop surface microhardness were evaluated. Analysis of Variance (ANOVA) and Tukey\'s test demonstrated that wear of enamel was significantly reduced when a sodium bicarbonate solution was used to rinse the oral cavity following erosive episodes. For microhardness, ANOVA demonstrated only significant differences in function of the enamel condition (p < 0,0001). The eroded specimens presented microhardness values significantly lower than the group not submitted to the acid challenge. Sodium bicarbonate rinse controlled erosion of enamel caused by gastric acid-like solution. (AU)

• FAPESP's process: 06/05623-2 - In situ effect study of a sodium bicarbonate solution on enamel after simulation of endogenous dental erosion
• Grantee: Danielle Cristine Furtado Messias
• Support Opportunities: Scholarships in Brazil - Doctorate