Aim: The aim of this study was to evaluate the erosive potential of saliva on dental enamel sucking the acidic candies, and their effects on the pH, titratable acidity (TA) and buffering capacity (β) of saliva. Methodology: Human enamel specimens (n = 216) were randomly in 17 acidic candy groups and one negative control (paraffin wax) group. Three human volunteers sucked each candy for 5 min while spitting into a covered and chilled vial. The pH, TA and β were measured immediately after the saliva collection. For erosive challenge, each specimen was immersed in saliva at room temperature for 120 min without agitation. The erosion was measured by surface microhardness (SMH) tester and with 3D non-contact optical profilometer for depth of surface loos (DSL). Percentage of SMH change (%SMHC) was calculated. ANOVA followed by Tukey test and Pearson correlation were performed (α=0.05). Results: All candies lowered saliva pH below 5.5, and produced significant DSL (P<0.05) and %SMHC (P<0.01) on enamel, when compared to negative control. The Baby bottle Pop candy presented the lowest erosive potential. No significant differences were observed in DSL between all candies and the negative control, except for the PicoSitos candy. However, for the %SMHC almost all the candies were significantly different from negative control. Correlations were observed between the pH and TA and β, between TA and β, and between the %SMHC and DSL variables (P<0.05). Conclusion: Acidic candies can lower the saliva pH, hindering its buffering effect. The DSL and %SMHC analysis showed enamel dissolution with all candies investigated.
Aim: To evaluate through an in vitro study surface changes on decayed enamel after the use of fluoridated dentifrices involving nanoencapsulated technology (NanoF). Methods: Forty blocks of human enamel were distributed among four groups (n = 10): 50% NanoF + 50% NaF (50% nF), 100% NanoF (100% nF), 100% NaF as the positive control (PC) and without fluoride as the negative control (NC). The specimens were subjected to a pH cycling model for 7 days. Surface microhardness (SMH), linear surface roughness (Ra) and area surface roughness (Sa) were measured before and after the carious lesion formation and at the end of the treatment. Percentages of surface microhardness recovery (%SMHR), altered Ra (%RaC) and altered Sa (%SaC) were calculated. The data were analyzed using the ANOVA test, repeated-measures ANOVA and Pearson's correlation test (p<0.05). Results: No significant differences among groups were found for Ra, Sa, %RaC or %SaC (p>0.05). Ra and Sa increased after treatment. A significant correlation was found between Ra and Sa. The PC dentifrice had the highest %SMHR, followed by 100% nF (p<0.05). In contrast, no surface remineralization was found in the 50% nF and NC groups. Conclusion: Enamel surface changes were found after the remineralizing treatment with 100% nF group. The majority of dentifrices with fluoride provided an increase in the roughness and surface microhardness. Nanotechnology is an innovative, promising method for the controlled release of fluoride and the remineralization of teeth with dental caries.
Objetivo: Avaliar e comparar o potencial erosivo de refrigerantes orgânicos e convencionais, disponíveis no mercado, utilizando as variáveis de pH, titulação ácida (TA) e capacidade tampão (CT). Metodologia: Foram analisadas 14 bebidas industrializadas adquiridas nos supermercados da Cidade de João Pessoa/PB, sendo 7 orgânicas e 7 convencionais do mesmo sabor. As medições de pH e TA para o pH 5,5 e 7,0 foram realizadas em triplicata, em 50ml de cada bebida, imediatamente após a sua abertura. A CT foi calculada baseada nos valores de pH e titulação ácida para o pH 7,0. Os dados foram analisados pelo teste ANOVA, seguido de Bonferroni e a correlação de Pearson, com significância de 5%. Resultados: Diferença estatisticamente significante foi encontrada entre os grupos, para todas as variáveis analisadas (p
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