In situ effect of enamel salivary exposure time and type of intraoral appliance before an erosive challenge

Author(s)

Mendonca, Fernanda Lyrio ^[1] ; Jordao, Maisa Camillo ^[1] ; Ionta, Franciny Querobim ^[1] ; Rabelo Buzalaf, Marilia Afonso ^[2] ; Honorio, Heitor Marques ^[1] ; Wang, Linda ^[3] ; Rios, Daniela ^[1]

Affiliation

^[1] Univ Sao Paulo, Bauru Sch Dent, Dept Pediat Dent Orthodont & Publ Hlth, Alameda Dr Octavio Pinheiro Brisolla 9-75, BR-17012101 Bauru, SP 17012101 - Brazil

^[2] Univ Sao Paulo, Bauru Sch Dent, Dept Biol Sci, Bauru, SP - Brazil

^[3] Univ Sao Paulo, Dept Operat Dent Endodont & Dent Mat, Bauru Sch Dent, Bauru, SP - Brazil

• Document type: Journal article
• Source: CLINICAL ORAL INVESTIGATIONS; v. 21, n. 8, p. 2465-2471, NOV 2017.
• Web of Science Citations: 9

Abstract

This study tested the effect of enamel salivary exposure time prior to an acid challenge (30 min, 1, 2, or 12 h) and type of intraoral appliance (palatal or mandibular) on initial erosion. After initial surface hardness evaluation, enamel blocks (n = 340) were randomly divided into groups and volunteers (n = 20). The control group was not exposed to saliva previously to the erosive challenge. The volunteers wore palatal and mandibular appliances simultaneously. After salivary exposure, the blocks were subjected to acid exposure by immersion in hydrochloric acid (0.01 M, pH 2.3) for 30 s. Then, the enamel surface hardness was evaluated. Data were analyzed using ANOVA, Kruskal-Wallis and Tukey's test (p < 0.05). No difference was observed on percent surface hardness change (% SHC) in the enamel blocks between the types of intraoral appliances. Exposure to saliva for 30 min and 1 h promoted similar enamel resistance to the erosive attack, which was similar to the control group for both appliances. Blocks exposed to saliva for 2 h showed less hardness loss when compared to 30 min. Keeping the blocks in saliva during 12-h overnight resulted in similar percentage of enamel hardness loss compared to 2 h. A 2-hour in situ exposure to saliva is adequate to promote partial protection against initial erosive lesions, independently of the type of intraoral appliance used. This finding will help researchers in the development of erosion studies, which will provide information for dentists to offer a better treatment for erosion. (AU)

• FAPESP's process: 13/15765-2 - Erosive remineralization and demineralization of enamel considering different times of salivary action and intraoral devices: in situ study
• Grantee: Fernanda Lyrio Mendonça
• Support Opportunities: Scholarships in Brazil - Master