The effect of magnesium hydroxide-containing dentifrice using an extrinsic and intrinsic erosion cycling model.
Arch Oral Biol
; 86: 46-50, 2018 Feb.
Article
en En
| MEDLINE
| ID: mdl-29156417
ABSTRACT
OBJECTIVE:
To evaluate, in vitro, the effect of Mg(OH)2 dentifrice, and the influence of the number of experimental days, on the extrinsic (citric acid -CA) and intrinsic (hydrochloric acid -HCl) enamel erosion models.DESIGN:
Human enamel slabs were selected according to surface hardness and randomly assigned to 3 groups (n=9) as follows non-fluoridated (negative control), NaF (1450ppm F- positive control) and Mg(OH)2 (2%) dentifrices. The slabs were daily submitted to a 2-h period of pellicle formation and, over a period of 5days, submitted to cycles (3×/day) of erosive challenge (CA 0.05M, pH=3.75 or HCl 0.01M, pH=2 for 30s), treatment (1min -13w/w of dentifrice/distilled water) and remineralization (artificial saliva/120min). Enamel changes were determined by surface hardness loss (SHL) for each day and mechanical profilometry analysis. Data were analyzed by two-way ANOVA followed by Tukey's test to % SHL and one-way ANOVA to profilometry (p<0.05).RESULTS:
The number of experimental days influenced the erosion process for the two types of erosion models (p<0.001). Mg(OH)2-containing dentifrices were effective in reducing enamel extrinsic acid erosion as determined by % SHL (p<0.001) when compared to the control group, being better than positive control (p<0.001); however, the dentifrices were not effective for the intrinsic model (p=0.295). With regards to surface wear, no statistically significant differences were found among the groups for CA (p=0.225) and HCl (p=0.526).CONCLUSION:
The findings suggest that Mg(OH)2 dentifrices might protect enamel against slight erosion, but protection was not effective for stronger acid erosion.Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Erosión de los Dientes
/
Esmalte Dental
/
Dentífricos
/
Hidróxido de Magnesio
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Arch Oral Biol
Año:
2018
Tipo del documento:
Article