[Method for measuring dental roots by roentgenograms for making experimental models]

Two methods were used for measuring the true size of abutment teeth roots for making experimental models. One method was based on the use of intraoral contact roentgenograms made with a Russian 5D-2 x-ray diagnostic dental device and the other on the use of roentgenograms made with parallel beam bundles from a longer distance using an x-ray diagnostic dental device with a more potent x-ray tube, Evolution-300 (Italy) on a Kodak x-ray film (USA) Ultra-speed-58, 3.1[symbol: see text]4.1 cm. The results obtained by the latter method are more accurate, the difference from the true size being no more than 0.5 mm. However intraoral contact roentgenograms give the results close to the true size of abutment teeth roots, for example, for one of the mandibular premolars; however a correction coefficient should be used.