Estudo clínico randomizado de diferentes protocolos de clareamento dentário comperóxido de hidrogênio a 7, 5

O clareamento é uma técnica conservadora e bastante procurada porpacientes que buscam uma melhoria na estética do sorriso. O objetivo destetrabalho foi avaliar a efetividade do tratamento clareador, com peróxido dehidrogênio a 7,5% em diferentes tempos, e avaliar a intensidade de sensibilidadedentária relacionada. Para isso, foram selecionados 60 pacientes e divididos em trêsgrupos: grupo PH10 - utilizou o gel por 10 min no dia; grupo PH30 – 30 min; grupoPH60 – 60 min. Os voluntários possuíam autonomia de interromper o clareamentoquando estivessem satisfeitos com o resultado, num intervalo entre 14 e 42 dias.Duas tabelas de sensibilidade (escala visual analógica e escala de classificaçãoverbal de 5 pontos) foram entregues aos participantes para que fossem preenchidasdiariamente com os níveis de sensibilidade. Foram feitas avaliações de cor comEscala Vitapan Classical e espectrofotômetro EasyShade aos 14, 21, 28 e 42 diasde tratamento, e 1 mês após o fim do clareamento, para avaliar efeito rebote da cor.O grau da satisfação do paciente foi medido por um questionário. Para análise dosdados, o teste exato de Fisher comparou os percentuais de participantes satisfeitoscom os participantes insatisfeitos em cada um dos três grupos (α = 0,05). Foi feito amédia (± desvio-padrão [DP]) do número de dias necessários para alcançar asatisfação dos participantes em cada um dos três grupos e avaliadosestatisticamente utilizando-se ANOVA e teste T (α = 0,05). A intensidade dasensibilidade foi avaliada através do teste Kruskal-Wallis (α = 0,05). Para análise dadiferença de cor de ambos os métodos (espectrofotômetro e escala de cor) foramutilizados dois testes: para um mesmo período nos diferentes grupos foi realizado oteste de Kruskal-Wallis (α = 0,05) e para o mesmo grupo em diferentes períodos foifeito o teste de Friedman (α = 0,05)...

Bleaching is a conservative technique and it much sought after by patientslooking for an improvement in smile esthetics. The objective of this study was toevaluate the effectiveness of bleaching treatment, with 7.5% hydrogen peroxide atdifferent time intervals, and evaluate the intensity of related tooth sensitivity. For this,60 patients were selected and divided into three groups: group PH10 - used the gelfor 10 min a day; group PH30 – 30 min; group PH60 – 60 min. The volunteers hadthe autonomy to stop bleaching when they were satisfied with the result, rangingbetween 14 and 42 days. Two sensitivity tables (Visual analogue scale and 5-pointverbal rating scale) were given to the participants to be filled in daily on the levels ofsensitivity. Color assessments were made using the Vitapan Classical Scale andEasyshade spectrophotometer at 14, 21, 28 and 42 days of treatment and 1 monthafter the end of the bleaching, to evaluate color rebound effect. Degree of patientsatisfaction was measured by a questionnaire. For data analysis, Fisher’s exact testcompared the percentage of satisfied with unsatisfied participants in each of thethree groups (α=0.05). The mean number (± standard deviation [SD]) of daysrequired to achieve the participant satisfaction in each of the three groups wascalculated and statistically analyzed using the ANOVA and t-test (α=0.05). Intensityof sensitivity was evaluated using the Kruskal-Wallis test (α=0.05). To analyze thedifference of color of both methods (spectrophotometer and color scale) two testswere used: for the same period in different groups the Kruskal-Wallis test wasperformed (α=0.05), and for the same group at different time intervals the Friedmantest was used (α=0.05)...

Effect of green tea as a protective measure against dental erosion in coronary dentine

Abstract The aim of this study was to evaluate the effect of green tea as a protective measure on eroded dentin. Disks of human coronary dentin were selected based on surface hardness and randomly assigned to 3 groups (n = 10): DW - distilled water, CHX - 0.2% chlorhexidine digluconate, and GT - green tea. The disks were allowed to acquire pellicle for 2 hours and were then subjected to 3 cycles per day of demineralization (C6H8O7 0.05 M, pH 3.75, 60 s), treatment (DW or CHX or GT, 5 min) and remineralization (artificial saliva, 60 min) over a period of 3 days. Changes in the dentin were determined by loss of surface hardness (%SHL) and mechanical profilometry analysis at the end of each day. Data were analyzed by two-way ANOVA followed by Tukey’s test for %SHL and profilometry (p < 0.05). Significant reductions in dentin hardness loss were observed only for the CHX group when compared to the DW group (p < 0.05). However, there was no significant difference between the CHX and GT groups (p > 0.05). A significant difference was observed between DW and GT treatments for wear and roughness measurements (p < 0.05). The green tea extract solution was able to reduce the wear and roughness caused by dentin erosion under the conditions of this study.