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A comparison of three panoramic x-ray machines revealed that the focal trough of the panorex curved inward in the posterior region, that of the GE-3000 remained straight, and that of the Orthopantomograph flared outward. The panorex was found to have the widest trough in the anterior region; the GE-3000 had the widest trough in the posterior regions.
A comparison of the established focal troughs of three panoramic machines with positions of the teeth in the dental arches of 240 patients. The patients, divided into twelve cells, were selected on the basis of race, sex, age, number of teeth, and occlusion. Occlusal registrations were made in fast-set acrylic. Tooth centers were identified and, with the… (More)
A quick, inexpensive quality assurance test for clinical dental radiography is described. Data on operator error in matching test radiographs and the use of the test in some radiographic facilities for 3 years indicate that the test can be useful in monitoring film processing and X-ray machine output in clinical practice.
The accuracy of an aluminum step-wedge quality-assurance test for machine and processor in dental radiography was determined. The clinical radiographic density range accepted by twenty dentists was similar to eight steps of an aluminum step-wedge test object, with dentists using six or seven steps. The test used a two-step density shift to detect and… (More)
Evaluation of the effect of radiographic technique upon the prediction of tooth lengths for all major types of teeth indicated the following: 1. The paralleling technique using the Rinn XCP film holder, the paralleling technique using the hemostat with bite block, and the bisecting-the-angle technique using the Rinn XCP film holder were the most accurate… (More)