TI :The study of technical failure of intraoral roentgenography
AU : Kang YS
AD : Department of Radiology, Infirmary of Dental College, Seoul National University
SO : JKAMFR. 1977;7(1):27-30
PY : 1977
LA : KOREAN
CP : KOREA
AB : To insure accuracy in dental roentgenographs, the patient's head position and angulation of the x-ray tube is impo rtant. In 1907 Cieszynski applied the rule of isometry to dental radiography, and established that in the production of an accurate image of a tooth, the central ray must be projected perpendicularly to a plane bisecting angle formed by the longitudinal axis of the tooth and the film plane. Proper exposure of the film is a part of the production of a good de ntal radiograph, and correct processing also makes an essential contribution to the quality of the radiograph.
The author analysed the failure of exposure and processing results, and recommends followings.
1. The patient head must be positioned that occlusal plane are parallel with the horizontal floor.
2. Central ray must be projected to the objective tooth and supporting structure and projected as perpendicularly to tooth axis and film surface as possible.
3. In processing, the temperature of the solution and the processing time must be correct.