At any brushing stage, sealed composites presented superior performance when compared with unsealed composites.
ObjectiveThe aim of this study was to evaluate the capacity of potassium oxalate, fluoride gel and two kinds of propolis gel to reduce the hydraulic conductance of dentin, in vitro. Material and MethodsThe methodology used for the measurement of hydraulic conductance of dentin in the present study was based on a model proposed in literature. Thirty-six 1-mm-thick dentin discs, obtained from extracted human third molars were divided into 4 groups (n=9). The groups corresponded to the following experimental materials: GI-10% propolis gel, pH 4.1; GII-30% propolis gel; GIII-3% potassium oxalate gel, pH 4,1; and GIV-1.23% fluoride gel, pH 4.1, applied to the dentin under the following surface conditions: after 37% phosphoric acid and before 6% citric acid application. The occluding capacity of the dentin tubules was evaluated using scanning electron microscopy (SEM) at ×500, ×1,000 and ×2,000 magnifications. Data were analyzed statistically by two-way ANOVA and Tukey's test at 5% significance level. ResultsGroups I, II, III, IV did not differ significantly from the others in any conditions by reducing in hydraulic conductance. The active agents reduced dentin permeability; however they produced the smallest reduction in hydraulic conductance when compared to the presence of smear layer (P<0.05). The effectiveness in reducing dentin permeability did not differ significantly from 10% or 30% propolis gels. SEM micrographs revealed that dentin tubules were partially occluded after treatment with propolis. ConclusionsUnder the conditions of this study, the application of 10% and 30% propolis gels did not seem to reduce the hydraulic conductance of dentin in vitro, but it showed capacity of partially obliterating the dentin tubules. Propolis is used in the treatment of different oral problems without causing significant great collateral effects, and can be a good option in the treatment of patients with dentin sensitivity.
The purpose of this study was to evaluate the clinical performance of glass ionomer cement (GIC) restorations comparing two minimally invasive methods in permanent teeth after 12 months. Fifty pregnant women (second trimester of pregnancy), mean age 22 ± 5.30 years, were treated by two previously trained operators. The treatment approaches tested were: chemomechanical method (CarisolvTM; MediTeam) and atraumatic restorative treatment (ART). A split-mouth study design was used in which the two treatments were randomly placed in 50 matched pairs of permanent teeth. The chemomechanical method (CM) was the test group and the ART was the control group. The treatments were performed in Public Health Centers. The tested restorative material was a high-strength GIC (Ketac Molar; 3M/ESPE). The restorations were placed according to the ART guidelines. Two calibrated independent examiners evaluated the restorations in accordance with ART criteria. The interexaminer kappa was 0.97. Data were analyzed using 95% confidence interval on the binomial distribution and Fisher's exact test at 5% significance level. In a 12-month follow-up, 86% of the restorations were evaluated. In the test group (CM), 100% (CI=93.3-100%) of the restorations were considered successful. In the control group (ART) 97.6% (CI=87.4-99.9%) of the restorations were considered successful and 2.4% unsuccessful (marginal defect >0.5 mm). There was no statistically significant difference between the 12-mounth success rate for both groups (Fisher's exact test: P=0.49) and between the two operators (Fisher's exact test: P=1.00). Both minimally invasive methods, chemomechanical method and ART, showed a similar clinical performance after 12 months of follow up.
Agradeço de forma especial Ao meu orientador, Prof. Dr. José Carlos Pereira. Muito obrigada por sua dedicação, pelo seu tempo, mesmo quando na ausência dele, pelos ensinamentos transmitidos, pela paciência...(e que paciência!) e, principalmente, muito obrigada por acreditar em mim! Tudo isso, professor, foi essencial à conclusão do nosso trabalho! vii Agradeço de Coração Aos meus pais, Raul e Cidinha! As palavras, nesse momento, faltam! Porque não há o que possa ser dito ou escrito que realmente traduza o imenso amor e gratidão que tenho por vocês! Obrigada, meus pais, por estarem semrpe ao meu lado! Aos meus irmãos, Raul (meu "Precioso Lindo"!) e Ana Zilda, pessoas que amo muito e com quem divido a felicidade que hoje sinto pela finalização dessa etapa! Aos meus tios e primos, que sei que torcem por mim, que vibram comigo! Obrigada pelos tantos bons momentos que passamos juntos! À Mónica que, desde o nosso curso de Especialização, esteve sempre ao meu lado. Que, indubitavelmente, também foi essencial-e eu já disse isso a você, não é, Monique?!-á conclusão desse trabalho! Obrigada por me "agüentar" por tanto tempo! Você sabe o quanto você é importante, não?! Por isso, peço, mesmo de longe, continue por perto, está bem?! Às minhas amigas, que moram no meu coração, Kate e Lucimara. A vocês, que sempre, desde minha graduação, estiveram comigo e acompanharam passo a passo viii toda essa etapa da minha vida, dizer "obrigada" é muito pouco pelo "tudo" que sempre fizeram! A vocês, minha eterna gratidão! À Susy, que é minha friend querida, muito querida! Infelizmente, friend, nem sempre você pode estar ao meu lado. Infelizmente mesmo! Mas, apesar de preferir que você realmente esteja mais presente no meu dia a dia, saiba que, hoje, mesmo nos poucos momentos que podemos estar juntas, você ainda consegue ser a minha "dear friend"! Obrigada por ainda estar ao meu lado! À Fernanda, que, a cada dia, me surpreende com a grandeza de suas atitudes. Obrigada, não somente por sua ajuda para a conclusão deste trabalho, mas pelo fato de saber que posso contar com você! Obrigada, Fer! À Mirian, que sempre me socorre nos meus momentos de baixo astral! Obrigada por me escutar, obrigada por me fazer rir!. À Dani, minha mais nova amiga, pelo carinho, pela atenção, por sua amizade. À Renata, pela eterna paciência! Pelo apoio imprescindível à realização desta dissertação. ix A você, Bruno, pela disponibilidade em me ajudar em meus trabalhos! Nem tenho como agradecê-lo pela gentileza e presteza.
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