Читать книгу Orthodontic Treatment of Impacted Teeth - Adrian Becker - Страница 85

The left‐hand image in Figure 4.16 represents the anterior portion of a reconstructed panoramic view, depicting a typical, palatally impacted and strongly tipped canine. At the same time, the root of the lateral incisor is tipped mesially. The right‐hand image in Figure 4.16 shows a row of eight serial cross‐sectional cuts across the root of the lateral incisor, presenting a suspicion of root resorption, due to the proximity of the canine crown. Because the cross‐sectional cuts are always vertical on a reconstructed panoramic view, the tipped root of the lateral incisor cannot be sectioned to reveal the resorption to its full extent. The MPR screen (Figure 4.17) is the place to look for the extent of the resorption. The coronal (Figure 4.17c) and sagittal (Figure 4.17b) planes are tilted to bring the lateral incisor long axis to a perfect vertical posture. The rotating tool is placed on the tooth axis in the axial (Figure 4.17a) plane. The tool is then rotated 360°, thus depicting its outline at every possible angle. The window in Figure 4.17d is recording the resorption in the disto‐palatal aspect. The tool continues on its way around the tooth axis and in Figure 4.18 a resorption in the palatal aspect is recorded, indicating the breadth of the resorption lesion. There is, indeed, no substitute for this diagnostic ability in the aspect of the tooth long axis (orthodontic treatment by Dr Ronen Zoizner).