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Dentomaxillofac Radiol ; 37(3): 142-8, 2008 Mar.
Article in English | MEDLINE | ID: mdl-18316505

ABSTRACT

OBJECTIVES: Evaluation of a particular digital caries image-enhancing mode (filter) for its effect on the validity of measurements of caries lesion depth. METHODS: Standardized radiographs of 44 extracted teeth exhibiting interproximal caries lesions were obtained. Six radiographs were obtained of each tooth and digitized. Four radiographs were made using D-speed film with and without soft tissue scattering equivalent (STSE) at normal exposure time (0.32 s) and underexposed (0.16 s). Two were made using E-speed film with STSE normally (0.16 s) and underexposed (0.08 s). On each of the 264 radiographs, 4 independent examiners measured the central depth (CD) of 1 carious lesion per tooth both on the unchanged radiographic image and after use of the filter. Histometric CD assessments provided a gold standard for comparison with the radiographic measurements (validity). Repeated measures ANOVA was calculated for validity in relation to examiner, lesion type, filter, film type, exposure time and STSE. RESULTS: The lesion type was identified to statistically significantly influence the validity of CD measurements. Examiner in combination with defect type (P<0.001), filter (P = 0.017), exposure (P = 0.027) and film type (P = 0.044) had an additional albeit small effect. CONCLUSIONS: The lesion type significantly influenced the validity of CD measurements: enamel lesions were less underestimated than dentin lesions.


Subject(s)
Dental Caries/diagnostic imaging , Radiographic Image Enhancement/methods , Radiography, Dental, Digital/methods , Dental Caries/pathology , Dental Enamel/diagnostic imaging , Dental Enamel/pathology , Dentin/diagnostic imaging , Dentin/pathology , Humans , Image Processing, Computer-Assisted/methods , Image Processing, Computer-Assisted/statistics & numerical data , Observer Variation , Radiation Dosage , Radiography, Dental, Digital/statistics & numerical data , Scattering, Radiation , Time Factors , X-Ray Film/classification
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