Abstract
Aim: To investigate the accuracy of measurements in vertical and horizontal direction using an extra-oral calibration object placed in different positions on the panoramic radiograph in JPEG and DICOM image format. Methods: Digital panoramic radiographs of a purpose made model with 32 removable teeth replaced with metal balls were taken. The measurements of metal balls were performed with and without the calibration object placed in the middle or on the side of the radiograph in JPEG and DICOM image formats. Results: One sample t-test was used for the analyses of accuracy of measurements in vertical and horizontal direction. The most accurate vertical measurements were achieved in canine group in JPEG (6.02±0.04 mm, P=0.144) and DICOM (6.03±0.07 mm, P=0.104) formats using calibration object placed in the middle of the radiograph. The mean values of measurements in horizontal direction differed significantly from the real values (P<0.05) in all teeth groups regardless of the image format. Conclusion: The most accurate measurements in vertical direction were achieved by placing the metal scale ruler extra-orally in the middle of panoramic radiograph independent of the image format. Reliable clinical accuracy for measurements in horizontal direction was achieved only in canine region (G2) in both image formats.
Highlights
Panoramic radiography is commonly used imaging modality representing a valuable diagnostic tool in the dental clinical practice [1]
When Joint Photographic Experts Group (JPEG) image format with the calibration object positioned in the middle of the radiograph were assessed by performing vertical and horizontal measurements of 32 metal balls (6 mm diameter), the mean vertical values were 6.03±0.06 mm (P=0.056) in incisor group and 6.02±0.04 mm (P=0.144) in canine group, while vertical measurements in premolar and molar groups differed significantly from the real metal ball diameter (P
When using Digital Imaging and Communication in Medicine (DICOM) image format with the calibration object positioned in the middle of the radiograph the most accurate vertical measurements were in the canine group (6.03±0.07 mm, P=0.104)
Summary
Panoramic radiography is commonly used imaging modality representing a valuable diagnostic tool in the dental clinical practice [1]. Ivanović & Mihanović oramic radiographs are standard examination tools for the assessment of bone architecture and are useful in planning of the initial diagnostic phase of the implant treatment [5]. It may be indicated for the purpose of postoperative assessment and periodic review of implants [5]. Cone-beam computed tomography (CBCT) is required for preoperative cross-sectional imaging when clinical conditions indicate a need for augmentation procedures and bone reconstruction prior to the implant placement. CBCT is indicated as postoperative imaging technique only if the patient presents the implant mobility [5]
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