Performance of alternative DenOptix PSPs erasing times on subjective digital image quality / Influencia de tempos alternativos de dessensibilização das placas de fosforo do sistema denoptix na qualidade da imagem digital

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The aim on this study was to verify if DenOptix?s phosphor plates alternative erasing times would cause any influence on the image quality and on the diagnosis of approximal caries. Ten human teeth phantoms were radiographed using phosphor plates, partially erased. The chosen erasing times were: 130s, 98s, 66s, 34s, 25s, 20s, 15s, 10s, 5s e 0s. Two observers, independently, evaluated the general quality of each image, scoring the images on contrast, density, sharpness and structures definition (enamel, dentine and enamel-dentine junction). The presence of double image was also evaluated. The resultant data was evaluated using the Spearmen?s correlation, variance analysis, and Tukey?s test. The erasing times from 20s to 130s had a satisfactory quality in all the evaluated items. After the first evaluation, the erasing times that showed statistical efficiency in the evaluated quality items of the image went through another evaluation regarding the presence of approximal caries. The images of the selected erasing times were evaluated by five observers. Each observer scored the approximal surfaces of each tooth. The scores were compared to the golden standard. The alternative erasing times were evaluated by their accuracy on predicting caries by means of the ROC curve analysis. The means of the ROC curves of each erasing time evaluated varied from 0,61 to 0,66 and did not show significant statistical difference between them. The alternative erasing times from 20s to 130s was satisfactory both on the quality analysis as on approximal caries diagnosis, what makes the use of those alternative erasing times of DenOptix?s phosphor plates feasible during clinical practice

ASSUNTO(S)

caries dentarias dentes curva roc roc curve teeth dental caries

Documentos Relacionados