كليدواژه :
دندانپزشكي , راديوگرافي , پانوراميك , ODONTORAMA مدل , Radiography , Panoramic , Magnification , بزرگنمايي
چكيده لاتين :
Magnification in panoramic radiographics causes errors in treatment plans. The goal of the present study, conducted in the faculty of Dentistry Islamic Azad University (1382), was to determine the amount of such magnification in panoramic radiographics.
To do this descriptive study, sixty samples referred to the radiology department. Were selected sequentially. A standard metalic ball with the diameter of 5mm was placed in the mouth, where as the actual size of the extracted tooth was measured by AACO caliper, at the level of 0.01 mm accuracy. Then, the balls and teeth images, prepared by panoramic radiography machine: TROPHY model odontorama PC were measured and examined by paired t-test. Following the measurement of the sample size and their images carefully and doing statistical tets, these conclusions were drawn:
1- The amount of magnification, in the anterior region, in length was found 42% (P<0.0001) and that of width was 24.8% (P<0.0001).
2- In the posterior region, the amount of maggification were 37.48% (P<0.0001) in tooth samples, 39.4% (P,0.0001) in ball samples, and in width 30.55% (P<0.0001) in tooth samples, 29.8% (P<0.0001) in ball samples. It should be mentioned that sex and age do not play any role on the results. Moreover, due to the low magnification difference between ball and tooth samples, the use of ball, to determrie the amount of magnification in different• region is clicnically possible.
The above mentioned machine has the following.
1- length of the anterior region
2- length of the posterior region
3- width of the posterior region
4- width of the anterior region
Thus, it is recommended that all images should be prepared by an experienced operator, with a machine of the minimum magnification that the amount of it is explained beside the radiographs.
