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  • Title: Influence of spatial resolution and bit depth on detection of small caries lesions with digital receptors.
    Author: Wenzel A, Haiter-Neto F, Gotfredsen E.
    Journal: Oral Surg Oral Med Oral Pathol Oral Radiol Endod; 2007 Mar; 103(3):418-22. PubMed ID: 17321456.
    Abstract:
    OBJECTIVE: The aim of this study was to compare the caries diagnostic accuracy among intraoral digital receptor systems that provide images in more than one resolution and bit depth. STUDY DESIGN: Eighty noncavitated extracted human teeth were radiographed and analyzed by the following digital systems: Digora Optime (Soredex) 8-bit high- and 8-bit super-resolution, VistaScan (Dürr) 8-bit high- and 8-bit max-resolution and 16-bit high- and 16-bit max-resolution, Dixi2 (Planmeca) 8-bit and 12-bit depths. Insight Film was included as a reference. Six observers scored caries lesions in each tooth surface. The teeth were sectioned and microscopy served as validation. Two-way analysis of variance tested differences in sensitivity, specificity, positive and negative predictive values, and overall accuracy (true positives + true negatives) between the modalities. RESULTS: There were 160 approximal surfaces examined, and histology showed 63% sound, 31% enamel, and 6% dentinal lesions. Sensitivity was not significantly different within each brand except for VistaScan 8-bit max-resolution, which showed higher sensitivity than the 2 VistaScan high-resolution modalities (P = .003). Digora super-resolution showed higher sensitivity than almost all the other modalities (P < .02), but had lower specificity than all other systems, among which there were no differences. Overall accuracy was significantly lower for Digora high-resolution than for Dixi2 and VistaScan max-resolution modalities (P < .03); there were no differences among the other modalities. CONCLUSION: Caries diagnostic accuracy seems to be little influenced by an increase in spatial resolution and bit depth from 8-bit to 12- or 16-bit within digital radiographic system brands. Between systems, the Digora super-resolution images provided higher sensitivity, but lower specificity than most of the other receptors.
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