Akesson L
Department of Oral Radiology, Faculty of Odontology, Lund University, Malmö, Sweden.
Swed Dent J Suppl. 1991;78:1-129.
The radiation dosage for the Orthopantomograph model OP5 was measured using two different sizes of collimators. The concordance between and accuracy of panoramic radiography and periapical and bitewing radiography was examined regarding assessment of the marginal bone level. The measurability of panoramic and periapical and bitewing radiographs was compared, as was the image quality of panoramic radiographs from one selected sample and two random samples. The energy imparted was 0.4-0.8 mJ for one panoramic radiograph. The use of the narrow collimator reduced the dosage by about one-third. The concordance between panoramic and intraoral radiography was high. In some anatomical regions, the concordance was as high as the intraobserver agreement for one and the same technique. The concordance was lower in sites with severe bone loss, however. Sounding was very accurate for the measurement of the marginal bone loss. Of the radiographic techniques, periapical radiography was most accurate. The observer performance for linear measurements of bone loss varied substantially and systematically among five observers. The measurability in the upper arch was the same in panoramic and periapical radiography. In the lower arch, the measurability of periapical radiography was better. The image quality of panoramic radiography influenced the measurability. The image quality of panoramic radiographs from random samples was inferior to that of the selected sample. It was concluded that, for the assessment of the marginal bone level, the panoramic radiograph should be the radiographic examination of choice, if increased image quality is achieved.
使用两种不同尺寸的准直器测量了OP5型曲面体层摄影机的辐射剂量。就边缘骨水平的评估而言，检查了全景放射摄影与根尖片和咬合翼片放射摄影之间的一致性和准确性。比较了全景片、根尖片和咬合翼片的可测量性，以及从一个选定样本和两个随机样本获得的全景片的图像质量。一张全景片的能量传递为0.4 - 0.8 mJ。使用窄准直器可使剂量减少约三分之一。全景放射摄影与口内放射摄影之间的一致性很高。在某些解剖区域，一致性与同一技术的观察者内一致性一样高。然而，在骨丢失严重的部位，一致性较低。探诊在测量边缘骨丢失方面非常准确。在放射摄影技术中，根尖片最准确。五位观察者对骨丢失的线性测量的观察者表现差异很大且具有系统性。全景片和根尖片在上颌弓的可测量性相同。在下颌弓，根尖片的可测量性更好。全景放射摄影的图像质量影响可测量性。随机样本的全景片的图像质量不如选定样本的。得出的结论是，对于边缘骨水平的评估，如果能提高图像质量，全景片应作为首选的放射学检查。
