Poder de remineralização de dentifrícios fluoretados na lesão de erosão do esmalte

This study aimed to evaluate the remineralization potential of fluoridated dentifrices in human enamel erosion using an in vitro pH cycling model. It was used 75 enamel blocks (4x4x2mm), divided into 5 groups (n = 15 / group) according to their initial microhardness value (SH0): G1 - 100% NaF (positive fluoride control); G2 - Placebo; G3 - Regenerate ™; G4 -Sensodyne Pro-Esmalte ™; and G5 - Colgate Sensitive Pro Relief ™. After the enamel erosion lesion, the blocks were reanalyzed for microhardness eroded area (SH1) and the percentage microhardness loss (% SMHP) was calculated. The samples were treated with slurries suspensions (1:3 – deionized water) following a remineralizing 7 days pH model cycling. At the same time, the mean of the test area (SH2) and the percentage remineralization surface microhardness (% SMHR). The data were analyzed by ANOVA, followed by Tukey and ANOVA Repeated Measures, followed by Bonferoni, for analysis of SH0, SH1, SH2, %SMHP e %SMHR variables. The significance level considered was 95% (p0.05), but not for the %SMHR(p 0.05), presenting an increase in enamel surface hardness (remineralization) when compared to G2, G3 and G5. Thus, the importance of fluoridated dentifrices in the protection and remineralization of dental erosion is evident. However, the mechanisms of action by which these compounds exert their effects on erosion lesions still need to be investigated and elucidated by applying different in vitro models and in situ studies.Este estudo teve como objetivo avaliar o potencial remineralizador de dentifrícios fluoretados na lesão de erosão em esmalte humano, utilizando um modelo de ciclagem de pH in vitro. Foram utilizados 75 blocos de esmalte (4x4x2mm), divididos em 5 grupos (n=15/grupo) de acordo com o valor de microdureza inicial (SH0): G1 – 100%NaF (controle positivo do flúor); G2 – Placebo; G3 – RegenerateTM; G4 –Sensodyne Pró-EsmalteTM; e G5 – Colgate Sensitive Pró AlívioTM. Após a produção da lesão artificial de erosão, os blocos foram analisados quanto a microdureza da área erodida (SH1) e em seguida foi calculado o percentual de perda de microdureza (%SMHP). As amostras foram tratadas com a suspensão de dentifrícios (1:3 - água deionizada) seguindo um modelo remineralizante (7 dias) de ciclagem de pH. Ao término da ciclagem foram determinados os valores da microdureza final da área teste (SH2) e o percentual de remineralização da microdureza de superfície (%SMHR). Os dados foram analisados pelos testes ANOVA, seguido de Tukey e ANOVA RepeatedMeasures, seguido de Bonferoni, para a análise das variáveis SH0, SH1,SH2, %SMHP e %SMHR. O nível de significância considerado foi de 95% (p0,05), entretanto, o %SMHRfoi significativo (p0,05), apresentando um aumento de microdureza superficial (remineralização) quando comparado aos G2, G3 e G5. Assim, é evidente a importância dos dentifrícios fluoretados na proteção e remineralização da erosão dentária. No entanto, os mecanismos de ação pelos quais esses compostos exercem seus efeitos nas lesões de erosão ainda precisam ser investigados e elucidados, aplicando-se diferentes modelos in vitro e estudos in situ

Tara Gum as a Controlled Delivery System of Fluoride in Toothpaste: In Vitro Enamel Remineralization Study

Objective:  To evaluate the remineralizing potential of a hydrocolloid-based, controlled fluoride-releasing system added to dentifrice formulas. Material and Methods: Sixty-five human enamel blocks were prepared and the surface microhardness (SH0) values were determined. The artificial caries lesions were induced and the demineralization surface microhardness (SH1) was evaluated. The blocks were randomly allocated into five groups (n = 13): (1) 100-TGF (100% NaF with Tara gum added); (2) 50-TGF (50% free NaF + 50% NaF with Tara gum added); (3) 100% TG (100% Tara gum without fluoride); (4) 100% NaF (positive control); and (5) placebo (without Tara gum and NaF). The blocks were submitted to 7 days pH cycling and treated with dentifrice slurries twice a day. Finally, surface hardness (SH2) was assessed and the percentage of surface hardness recovery (%SMHR) was calculated. Analysis of variance (ANOVA) followed by Bonferroni test was used for statistical analysis. Results: A positive %SMHR was found in the 100% NaF (5.07) and 50-TGF (0.64) groups, while the 100-TGF (-1.38), 100% TG (-3.88) and placebo (-0.52) did not undergo remineralization. Statistically significant differences were observed between 100% NaF and all the groups except for 50-TGF (p<0.05). Conclusion: The presence of hydrocolloid (Tara gum) promoted minimal remineralization when associated with NaF. In the applied model, Tara gum may have compromised remineralization, preventing free fluoride from acting effectively in the carious lesion

Investigation of the Erosive Potential of Different Types of Alcoholic Beverages

Objective: To evaluate the erosive potential of different alcoholic beverages according to pH, titratable acidity and buffering capacity. Material and Methods: Thirteen industrialized alcoholic beverages of different brands were selected and divided into five groups according to their type and composition. The pH measurement and titratable acidity for pH 5.5 and 7.0 were performed in triplicate in 50 mL of each beverage. The buffering capacity was calculated based on pH and titratable acidity for pH 7.0. ANOVA, Tukey, and Pearson correlation, with p<0.05, were used for data analysis. Results: Data showed normal distribution by Shapiro-Wilk test. The pH of alcoholic beverages ranged from 2.49 (Miks Ice Tea - Green Fruits) to 7.64 (Smirnoff). The highest values of acid titration (4.68) and buffer capacity (19.97) were observed in Smirnoff Ice. The following correlations (p<0.01) were noted between: pH and titratable acidity; buffering capacity and pH; buffering capacity and titratable acidity. Conclusion: Some beers and alcopops presented erosive potential due to their lower pH associated with high acid titration values. The whisky and sugarcane liquor examined were not potentially erosive

Erosive effect of industrialized fruit juices exposure in enamel and dentine substrates : an in vitro study

Erosive tooth wear has been a highly prevalent and emerging phenomenon related to eating habits of the population. Aim: This study sought to investigate industrialized fruit juices exposure in enamel and dentine substrates in terms of erosive effect. H

Influence of energy drinks on enamel erosion : in vitro study using different assessment techniques

Dental erosion has become a relevant public health problem in recent years and is related to the increase in the consumption of acidic beverages. Objective: The aim of the present study was to evaluate the erosive potential of energy drinks on dental ena