In vivo study of pixel grey-measurement in digital subtraction radiography for monitoring caries remineralization
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Data
2009
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Resumo
Objectives: The aim of this study was to evaluate the performance of a quantitative method,
based on pixel grey value measurements, for monitoring caries remineralization.
Methods: Proximal radiographs of 11 patients (61 enamel caries lesions) were taken both
before and after a 2 month remineralization protocol. Radiographs were digitized and for
each area a follow-up image was subtracted from a baseline image. A quantitative analysis
was undertaken using ImageTool software (University of Texas Health Science Center, San
Antonio, TX). For each caries lesion diagnosed, a mean pixel value was obtained in digital
subtraction radiographs (SR) using a scale ranging from 0–255 grey values. To identify caries
status after the remineralization protocol, a subjective analysis of SR was undertaken by 6
radiologists who graded the lesions as demineralized (n 5 10), unchanged (n 5 34) or
remineralized (n 5 17).
Results: There was a statistically significant difference between the mean pixel values for
demineralized (112.1¡14.4), unchanged (127.3¡12.3) and remineralized (137.5¡13.8)
lesions.
Conclusions: It was concluded that the status of proximal caries lesions after
remineralization therapy can be assessed by pixel grey measurements in SR and may
constitute a suitable complementary method for monitoring the results of remineralization
protocol in clinical practice.
Descrição
Palavras-chave
Subtraction technique, Tooth remineralization
Citação
CARNEIRO, L. S. et al. In vivo study of pixel grey-measurement in digital subtraction radiography for monitoring caries remineralization. Dentomaxillofacial Radiology, London, v. 38, n. 2, p. 73-78, 2009.