Eroded enamel rehardening using two intraoral appliances designs in different times of salivary exposure.

Autor:	Mendonça FL; Department of Pediatric Dentistry, Orthodontics and Public Health Bauru School of Dentistry, University of São Paulo - Bauru/SP - Brazil., Jordão MC; Department of Pediatric Dentistry, Orthodontics and Public Health Bauru School of Dentistry, University of São Paulo - Bauru/SP - Brazil., Val PP; Department of Pediatric Dentistry, Orthodontics and Public Health Bauru School of Dentistry, University of São Paulo - Bauru/SP - Brazil., de Alencar CR; Department of Pediatric Dentistry, Orthodontics and Public Health Bauru School of Dentistry, University of São Paulo - Bauru/SP - Brazil., Bassoto MA; Department of Pediatric Dentistry, Orthodontics and Public Health Bauru School of Dentistry, University of São Paulo - Bauru/SP - Brazil., Honório HM; Department of Pediatric Dentistry, Orthodontics and Public Health Bauru School of Dentistry, University of São Paulo - Bauru/SP - Brazil., Magalhães AC; Department of Pediatric Dentistry, Orthodontics and Public Health Bauru School of Dentistry, University of São Paulo - Bauru/SP - Brazil., Buzalaf MA; Department of Pediatric Dentistry, Orthodontics and Public Health Bauru School of Dentistry, University of São Paulo - Bauru/SP - Brazil., da Silva TC; Department of Pediatric Dentistry, Orthodontics and Public Health Bauru School of Dentistry, University of São Paulo - Bauru/SP - Brazil., Rios D; Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo - Bauru/SP - Brazil.
Jazyk:	angličtina
Zdroj:	Journal of clinical and experimental dentistry [J Clin Exp Dent] 2019 Dec 01; Vol. 11 (12), pp. e1127-e1132. Date of Electronic Publication: 2019 Dec 01 (Print Publication: 2019).
DOI:	10.4317/jced.56222
Abstrakt:	Background: The aim of this study was evaluated the eroded enamel rehardening potential using upper palatal and lower buccal removable appliances in different times of salivary exposure (30 min, 1h, 2h, 12h) after a single erosive challenge event. Material and Methods: After initial surface hardness evaluation, bovine enamel blocks were eroded in vitro (0.01 M hydrochloric acid, pH 2.3, 30 seconds), selected (n = 160) and randomly assigned to the two appliance designs and twenty volunteers. Four enamel blocks were inserted in each removable appliance. On the in situ phase, the volunteers were instructed to use the upper palatal and lower buccal appliances simultaneously for 12 nonconsecutive hours. After each predetermined period of time of salivary exposure, the enamel blocks were removed from the appliances for immediate evaluation of surface hardness, enabling percentage of surface hardness recovery calculation (%SHR). The data were analyzed using two-way ANOVA and Tukey's test (α=5%). Results: The results showed no difference in the degree of enamel rehardening by the upper palatal or lower buccal appliances ( p >0.0001). Regarding the time of use of the appliances, it was demonstrated that 30 minutes (upper = 21.12%, lower = 19.84%) and 1 hour (upper = 35.69%, lower = 30.50%) promoted lower hardness recovery than two hours (upper = 44.65%, lower 40.80%) of salivary exposure ( p <0.0001). The use of 12 hours (upper = 49.33%, lower = 49.00%), including the sleeping time of the volunteers did not increase the %SHR. Conclusions: The location of the appliance does not influence the re-hardening ability of saliva and the use of intraoral appliances for 2 hours seems to be appropriate for partial rehardening of the softened enamel surface. Key words: Tooth erosion, in situ, saliva, tooth remineralization. Competing Interests: Conflict of interest statement:The authors report no conflicts of interest in this study. (Copyright: © 2019 Medicina Oral S.L.)
Databáze:	MEDLINE
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