TI : Comparison of the image magnification in the jaws according to the types of panoramic machines
AU : Ha CH, Choi KS
AD : Department of Dental Radiology, College of Dentistry, Kyungpook National University
SO : JKAOMFR 1991;21(2): 287-296
ISSN : 1225-049X
PY : 1991
LA : KOREAN
CP : KOREA
AB : The purpose of this experiment is to compare the vertical and horizontal magnification, and the distortion of the radiographic image according to the types of panoramic machines. Total 70 radiographs, 10 radiographs out of 7 panoramic machines respectively, were taken from the dry skull with met al balls in the periapical areas of the central incisors, the canine, the second premolar, and the second molar in the m axilla and the mandible.
And the author evaluated the vertical and horizontal magnification degrees, and the distortion degrees of radiographi c images obtained from each panoramic machines. The results were as follows: There were no significant differences in the vertical and horizontal magnification degrees on the various portions of the jaws (p>0.05). But there were higher magnification degrees in the Panoura 10C, Panograph Ⅱ, and Veraview than t hose in other panoramic machines. The lowest average magnification degree was 20.27% vertically, 20.94% horizontally using the Panoradix.
This highest average magnification degree was 27.64% vertically, 28.48% horizontally using the Panograph Ⅱ. The lowest distortion was shown using the Panoura 10C in the maxilla, but there was not statistically significant dif ference between the panoramic machines in the mandible(p>0.05). There were no differences in the vertical and horizontal magnification degrees according to the types of the rotation centers.