Effect of different salivary exposure times on the rehardening of acid-softened enamel
Braz. oral res. (Online)
; 30(1): e104, 2016. tab, graf
Article
em En
| LILACS
| ID: biblio-952001
Biblioteca responsável:
BR1.1
ABSTRACT
Abstract This in situ study assessed the effect of different times of salivary exposure on the rehardening of acid-softened enamel. Bovine enamel blocks were subjected in vitro to a short-term acidic exposure by immersion in 0.05 M (pH 2.5) citric acid for 30 s, resulting in surface softening. Then, 40 selected eroded enamel blocks were randomly assigned to 10 volunteers. Intraoral palatal appliances containing 4 enamel blocks were constructed for each volunteer, who wore the appliance for 12 nonconsecutive hours initial 30 min, followed by an additional 30, and then by an additional 1 hour. For the last additional 10 hours the appliances were used at night, during the volunteers' sleep. Surface hardness was analyzed in the same blocks at baseline, after erosion and after each period of salivary exposure, enabling percentage of surface hardness recovery calculation (%SHR). The data were tested using repeated measures ANOVA and Tukey's test (α = 0.05). Increasing periods of salivary action promoted a progressive increase in the surface hardness (p < 0.001). However a similar degree of enamel rehardening (p = 0.641) was observed between 2 hours (49.9%) and 12 hours (53.3%) of salivary exposure. Two hours of salivary exposure seems to be appropriate for partial rehardening of the softened enamel surface. The use of the intraoral appliance during sleep did not improve the enamel rehardening after erosion.
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Texto completo:
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Índice:
LILACS
Assunto principal:
Saliva
/
Erosão Dentária
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Remineralização Dentária
/
Esmalte Dentário
Tipo de estudo:
Clinical_trials
/
Evaluation_studies
Limite:
Animals
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Female
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Humans
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Male
Idioma:
En
Revista:
Braz. oral res. (Online)
Assunto da revista:
ODONTOLOGIA
Ano de publicação:
2016
Tipo de documento:
Article