The aim of this paper was to assess the caries experience of 12- and 15-year-old schoolchildren from public and private schools in Salvador, Bahia, Brazil, and to identify the access of children to dental services and the coverage of such services, which might be related to differences between the groups. Cross-sectional data were obtained from 3,313 clinical exams, which followed the WHO (1997) criteria for the diagnosis of dental caries. The analysis was carried out by means of the Student's t test, the chi-square test and analysis of covariance. There were no differences regarding DMFT and frequency of caries-free individuals between public and private schools. However, while F (filled teeth) was the most prevalent component of the index in subjects from private schools, M (missing teeth) was the most common in those from public schools. The access to dental services in the last year was the only variable associated to the differences between both groups. Thus, the importance of access to dental services and social benefits must be pointed out in order to guarantee equity in oral health.
The appearance of a digital image is very important for a correct interpretation and, consequently, for a effective diagnosis. Purpose: There are many factors that may influence the quality of a digital image. The process of digitalization must be analyzed to make sure that possible negative interferences will be eliminated. Methods: Some of these interferences include image spatial resolution and image capture mode. Their repercussion in the dynamic range of digital images was analyzed by the program Photoshop (Adobe Systems Incorporated, Mountain View, California, USA). Results: The results showed that for a digitalized image, a spatial resolution much superior it is not required. Conclusion: For the digital images, the signal/noise ratio (SNR) cannot be neglected.
A aparência de uma imagem radiográfica digitalizada é de extrema importância para uma correta interpretação e conseqüentemente, um efetivo diagnóstico. Objetivo: Sabendo-se que são vários os fatores que podem influenciar a qualidade de uma imagem digitalizada, variáveis aplicadas durante o processo de digitalização foram analisadas, a fim de eliminar possíveis interferências negativas. Metodologia: Os parâmetros avaliados incluíram a resolução espacial da imagem e a modalidade de captura. A repercussão dessas variáveis no alcance dinâmico de imagens digitalizadas foi analisada pelo programa Photoshop (Adobe Systems Incorporated, Mountain View, Califórnia, EUA). Resultados: Foi possível perceber que para as radiografias digitalizadas indiretamente, uma resolução espacial muito superior não é requerida. Conclusão: A proporção sinal/ruído (signal/noise ratio – SNR) não deve ser negligenciada para as imagens digitais.
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