High-resolution CT of transplanted teeth: imaging technique and measurement accuracy

Abstract

The aim of this study was to determine the accuracy of crown diameter measurements by dental CT as a tool for preoperative diagnosis before tooth transplantations. Fifty-eight patients underwent clinically indicated dental CT. The diameter of the crowns were measured by CT using a standard protocol (1.5-mm slice thickness, 1-mm table feed, 120 kV, 25-75 mA/s, 2-s scan time/slice, 512 matrix) and a standard dental software package. Postoperatively, the same distances were clinically measured using a sliding gauge. The degree of the deviation between CT measurements and clinical measurements was in the sub-millimeter range. According to the regression analysis, the correlation coefficient equals 0.98 and 0.97, indicating a strong relationship between the CT and the manual measurement of the crown diameter in the bucco-lingual and the mesio-distal direction. The mean deviation of CT measurements with regard to the bucco-lingual diameter of the crown was +0.08 mm (SD: +/-0.38 mm). For the mesio-distal diameter, the mean deviation of CT measurements was -0.24 mm (SD: +/-0.53 mm). These results demonstrate that dental CT promises to be a valuable tool for the evaluation of the potential and optimal size and site for tooth transplantations.

Effect of Maxillary Sinus Floor Augmentation on Sinus Membrane Thickness in Computed Tomography

“…Preoperative and postoperative CT scans demonstrated high reproducibility of the corresponding axial slices ( r = 0.97, P <0.001), promoting accuracy of comparison 21 . No significant differences in sinus perimeter and sinus area measurements were seen before versus after augmentation surgery (Table 1), with a mean deviation of 7.5% ( P <0.05).…”