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Objetivo: Avaliar o comportamento e hábitos de higiene em usuários de próteses dentárias removíveis em um Centro de Especialidades Odontológicas (CEO). Material e Métodos: Estudo transversal e descritivo onde a amostra constituiu-se de 59 usuários, obtida pelo método não probabilístico. O instrumento de coleta continha informações referentes ao perfil demográfico da amostra, ao método de higiene da prótese e hábito de dormir com o aparelho protético. Os resultados foram analisados por estatística descritiva. Resultados: A maioria dos usuários era do sexo feminino (N = 34; 57,6%), com 50 anos ou mais (N = 44; 74,6%), possuíam 10 anos ou mais de edentulismo (N = 51; 86,5%), receberam orientações do cirurgião-dentista em relação à higienização e uso da prótese (N = 35; 59%), utilizavam o método mecânico com água-escova-dentifrício (N = 40; 68%) para higiene da prótese e não a removiam para dormir (N = 36; 61%). Conclusão: Concluiu-se que os participantes usam a prótese dentária há mais de cinco anos, realizam higiene da prótese, entretanto, não utilizam imersão em substâncias desinfetantes e não removem a mesma para dormir. Deste modo, é essencial que sejam realizados estudos como este, possibilitando a divulgação de informações que podem melhorar a qualidade de vida do usuário de prótese dentária removível.

Dentin reactions to caries, crucial for pathogenesis and for the determination of the severity of caries lesions, are believed to be reasonably detected by stereomicroscopy (SM) and polarized light microscopy in quinoline (PLMQ), but accuracies are not available. Here, stereomicroscopy of wet (SW) and dry (SD) ground sections of natural occlusal caries lesions resulted in moderate (0.7, for normal dentin) and low accuracies (< 0.6, for carious and sclerotic dentin) as validated by contrast-corrected microradiography. Accuracies of PLMQ were moderate for both normal (0.71) and carious dentin (0.71). The hypothesis that detection of dentin reactions by SM and PLMQ would be influenced by the contrast quality of micrographic images was rejected. Dentin reactions were scored by SW, SD, PLMQ, and three types of microradiographic images with varying contrast qualities and each technique was compared against the one that resulted in the highest number of scores for each dentin reaction. Large differences resulted, mainly related to the detection of sclerotic dentin by both SW and SD, and normal and carious dentin by PLMQ. It is concluded that contrast-corrected microradiography should be preferred as the gold standard and SM and PLMQ should be avoided, but the relationship of PLMQ with dentin mineralization deserves further investigation.

This study aimed to test the hypotheses that (i) a parameter related to permeability, α (ratio of squared water volume by the nonmineral volume) is, among all major component volumes (mineral, water, and organic volumes) the best predictor of quinoline infiltration in natural enamel caries (NEC), and (ii) the pore volume fraction infiltrated by quinoline (V ) in NEC is much lower than previous estimates that neglected water and organic enamel volumes. Mineral and nonmineral volumes and α were measured at 341 histological points (from 20 approximal NEC lesions), and transport of quinoline was tracked by orientation-independent polarizing microscopy. R values of V were 0.596 (α ), 0.033 (mineral volume), 0.474 (water volume), and 0.011 (organic volume). V values were 23% (body of the lesion), 7% (dark zone), and 9% (translucent zone), lower than previous estimates (with high effect size). Transport of quinoline occurred both parallelly and perpendicularly to prism paths, and dark zones were seen where only transport parallel to prisms occurred. In conclusion, α was the main predictor of quinoline infiltration, but it differed from the water volume with a small effect size, and the pore volume fraction with quinoline was much lower than previous estimates.

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