Abstract
INTRODUCTION: This in vivo study assessed accuracy and reliability of tooth length measurements obtained from conventional panoramic radiographs and CBCT panoramic reconstructions to that of a digital caliper (gold standard). METHODS: The sample consisted of subjects who had CBCT and conventional panoramic radiographic imaging and who required maxillary premolar extraction for routine orthodontic treatment. A total of 48 teeth extracted from 26 subjects were measured directly with digital calipers. Radiographic images were scanned and digitally measured in Dolphin 3D software. Accuracy of tooth length measurements made by CBCT panoramic reconstructions, conventional panoramic radiographs and digital caliper (gold standard) were compared to each other by repeated measures one-way ANOVA with Bonferroni correction and by single measures intraclass correlation coefficient. RESULTS: Repeated root length measures with digital calipers, panoramic radiographs and CBCT constructed panoramic-like images were all individually highly reliable. Compared to the caliper (gold standard), tooth measurements obtained from conventional panoramic radiographs were on average 6.3 mm (SD = 2.0 mm) longer, while tooth measurements from CBCT panoramic reconstructions were an average of 1.7 mm (SD = 1.2 mm) shorter. CONCLUSIONS: In comparison to actual tooth lengths, conventional panoramic radiographs were relatively inaccurate, overestimating the lengths by 29%, while CBCT panoramic reconstructions underestimated the lengths by 4%.
Highlights
This in vivo study assessed accuracy and reliability of tooth length measurements obtained from conventional panoramic radiographs and Cone-beam computed tomography (CBCT) panoramic reconstructions to that of a digital caliper
The objective of the present study was to determine reliability and accuracy of root length measurements obtained from conventional panoramic radiographs and CBCT panoramic reconstructions, compared to direct root length measurement with digital calipers, considered as the gold standard
Repeated measures of root length with digital calipers, conventional panoramic radiographs and CBCT panoramic reconstructions had very high reliability with intraclass correlation coefficient (ICC) values of 0.999, 0.997 and 0.995 respectively
Summary
This in vivo study assessed accuracy and reliability of tooth length measurements obtained from conventional panoramic radiographs and CBCT panoramic reconstructions to that of a digital caliper (gold standard). Accuracy of tooth length measurements made by CBCT panoramic reconstructions, conventional panoramic radiographs and digital caliper (gold standard) were compared to each other by repeated measures one-way ANOVA with Bonferroni correction and by single measures intraclass correlation coefficient. Modifications in arc radius and shape as well as static versus variable centers of rotation have been used to better approximate the shape of the maxillomandibular process in order to maintain patients’ dentoalveolar structures within the device’s focal trough.[1] Even with standardized head positions, the great variability in individual’s jaw dimensions and shape make achieving optimized panoramic images less predictable and repeatable
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