Accuracy of zoomed digital image in the detection of periodontal bone defect:in vitrostudy

Abstract

Objectives: (1) To evaluate the intraobserver agreement related to image interpretation and (2) to compare the accuracy of 100%, 200% and 400% zoomed digital images in the detection of simulated periodontal bone defects. Methods: Periodontal bone defects were created in 60 pig hemi-mandibles with slow-speed burs 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm and 3.0 mm in diameter. 180 standardized digital radiographs were made using Schick sensor and evaluated at 100%, 200% and 400% zooming. The intraobserver agreement was estimated by Kappa statistic (k). For the evaluation of diagnostic accuracy receiver operating characteristic (ROC) analysis was performed followed by chi-square test to compare the areas under ROC curves according to each level of zooming. Results: For 100%, 200% and 400% zooming the intraobserver agreement was moderate (k ¼ 0.48, k ¼ 0.54 and k ¼ 0.43, respectively) and there were similar performances in the discrimination capacity, with ROC areas of 0.8611 (95% CI: 0.7660 -0.9562), 0.8600 (95% CI: 0.7659 -0.9540), and 0.8368 (95% CI: 0.7346 -0.9390), respectively, with no statistical significant differences (x 2 -test; P ¼ 0.8440). Conclusions: A moderate intraobserver agreement was observed in the classification of periodontal bone defects and the 100%, 200% and 400% zoomed digital images presented similar performances in the detection of periodontal bone defects.

Comparison of changes in dental and bone radiographic densities in the presence of different soft-tissue simulators using pixel intensity and digital subtraction analyses

“…To simulate soft tissues, we used five types of materials in three diverse thicknesses. Both material type and thickness have been widely used 2,5,6,9,10,15,16 with aims to simulate the real anatomical structures. 27,28 In this study, we showed that both the material type and the thickness tested influenced the gain of density in bone tissue as demonstrated by DSR.…”

“…3 The use of soft-tissue simulation materials having densities similar to the tissues found in patients in a real environment helps avoid exposure of patients to excessive radiation during in vivo studies. 4 Based on literature, the use of soft-tissue simulators, such as acrylic plates, 2,4-8 wax, 2,4,9,10 water, 11-14 wood 4,15,16 and bovine tissue 17 has been tested in different ways with respect to the nature and/or the thickness of the material put around dry mandibles. 2,5,16 It is important that these simulation materials are accurately reproducible, measurable and are ready for use in any circumstances.…”

Effect on the contour of bone and soft tissue one year after harvesting chin bone for alveolar cleft repair

“…The analysis was carried out on two-dimensional radiographs. Measurements from conventional or digital radiographs do not accurately reflect the clinical situation, so they usually result in underestimation 6 . It is plausible that the residual defect the authors measured was actually an underestimation of clinical reality.…”

Accuracy of Linear Measurements Made on Cone Beam Computed Tomography Scans at Different Magnifications

“…The effects of magnification on the diagnostic accuracy of two-dimensional digital radiography have also been the subject of several studies. [12][13][14][15][16][17][18][19] According to the literature; no study has assessed the accuracy of linear measurements made on CBCT scans with different image magnifications. Therefore, this study aimed to assess the effects of image magnification on the accuracy of linear measurements made by New Tom VGi CBCT device (New Tom VGi, Quantitative Radiology, Verona, Italy).…”