RESUMO Objetivo: O objetivo do presente estudo foi avaliar a estabilidade de cor das resinas compostas Filtek Z350 XT, Filtek Z250 XT, Z100 e resina ortodôntica Transbond XT, utilizadas para attachments ortodônticos, quando imersas em bebidas populares. Métodos: Trinta corpos de prova em forma de disco de cada resina composta (2 x 5mm) foram confeccionados e divididos aleatoriamente em seis grupos, de acordo com as soluções de imersão: café, vinho tinto, vinho branco, cerveja clara, cerveja escura e água deionizada (controle). Os discos foram totalmente imersos nas soluções por seis dias a 37°C, representando aproximadamente seis meses de consumo. As medidas de cor foram realizadas por um espectrofotômetro de reflexão, no baseline (antes da imersão) e após o manchamento. As coordenadas L*a*b* foram medidas e a variação de cor (ΔE00) foi calculada usando a fórmula CIEDE2000. Os dados foram analisados utilizando a análise de variância seguida pelo teste post-hoc de Tukey, com nível de significância de 0,05. Resultados: As resinas imersas em vinho branco e cerveja clara apresentaram ΔE00 imperceptível ou clinicamente aceitável, sem diferença em relação ao grupo controle (p= 0,44449 e p= 0,467, respectivamente). A imersão em café e vinho tinto foi considerada clinicamente inaceitável e significativamente diferente do grupo controle (p= 0,0028 e p= 0,0475, respectivamente). Conclusão: Com base nos resultados do presente estudo, o consumo de café e vinho tinto pode causar alteração na cor dos attachments ortodônticos acima do limite de aceitabilidade visual e prejudicar a estética durante o tratamento.

ABSTRACT Objective: The aim of the present study was to evaluate the color stability of Filtek Z350 XT, Filtek Z250 XT, Z100 resin composites and Transbond XT orthodontic resin, all used in orthodontic attachments, when immersed in popular beverages. Methods: Thirty disk-shaped specimens of each resin composite (2 x 5mm) were manufactured and randomly divided into six groups according to immersion solutions: coffee, red wine, white wine, regular beer, dark beer and deionized water (control). The specimens were fully immersed in each of the solutions for six days at 37°C, representing approximately six months of consumption. The color measurements were evaluated by a reflection spectrophotometer, at baseline (before immersion) and after staining. L*a*b* coordinates were measured and the color change (ΔE00) was calculated using the CIEDE2000 formula. The data were analyzed by ANOVA/Tukey tests at a significance level of 0.05. Results: The resin composites immersed in white wine and regular beer showed either imperceptible or clinically acceptable ΔE00, and no difference from the control group (p= 0.4449 and p= 0.467 respectively). Immersion in coffee and red wine were considered clinically unacceptable and were significantly different from the control group (p= 0.0028 and p= 0.0475 respectively). Conclusion: Based on the results of the present study, the consumption of coffee and red wine may cause color change of the resin composite attachments above the visual acceptability threshold, and impair aesthetics during treatment.

Abstract Background Malocclusions are highly prevalent in childhood and adolescence, being considered a public health problem worldwide, in addition to be considered an important predictor in the tongue position and speech disorders. Objective Evaluate the association of malocclusions with tongue position and speech distortion in mixed-dentition schoolchildren from the south of Brazil. Methodology This cross-sectional study was performed using a database of an epidemiological survey realized in the southern of Brazil, in 2015, for evaluating the dental and myofunctional condition of the mixed-dentition from 7-13 years’ schoolchildren. The outcome variables were tongue position and speech distortion, evaluated by a trained and calibrated examiner. Characteristics regarding sociodemographic and oral health measures (Angle’s classification of the malocclusion, overjet, overbite, posterior crossbite and respiratory mode) were also assessed. Poisson regression models with adjusted robust variance were used to evaluate the association among predictors variables in the outcomes. Results are presented as prevalence ratio (PR) and 95% confidence interval (95% CI). Results A total of 547 children were evaluated. Schoolchildren who presented anterior open bite (PR 2.36 95%CI 1.59-3.49) and having oral/oral-nasal breathing (RP 2.51 95%CI 1.70-3.71) are more likely to have altered position of the tongue. Both deep bite and being male represent protection factors for the abnormal tongue position. Regarding speech distortion, deep overbite presents a protective relationship to speech distortion (PR 0.41; 95%CI 0.24-0.71), whereas schoolchildren with posterior crossbite were more likely to present this problem (PR 1.77; 95%CI 1.09-2.88). Conclusion Anterior open bite and posterior crossbite were the malocclusions related to speech distortion and/or altered tongue position. Oral/oral-nasal breathing was also related to myofunctional changes. Deep bite malocclusion was a protective factor for both speech problems and altered tongue position when compared to a normal overbite.