[Evaluation of dental X-ray apparatus in terms of patient exposure to ionizing radiation].

BACKGROUND: The use of X-ray in dental procedures causes exposure of the patient to ionizing radiation. This exposure depends primarily on the parameters used in tooth examination. The aim of the study was to determine the patients exposure and to assess the technical condition of X-ray tubes. MATERIAL AND METHODS: Seventeen hundred dental offices were covered by the questionnaire survey and 740 questionnaires were sent back. Direct measurements were performed in 100 units by using the thermoluminescent detectors and X-ray films. RESULTS: The results showed that the most commonly used exposure time is 0.22+/-0.16 s. The average entrance dose for the parameters used most commonly by dentists is 1.7+/-1.4 mGy. The average efficiency of X-ray tube estimated on the basis of exposures is 46.5+/-23.7 muGy/mAs. CONCLUSIONS: The study results indicate that the vast majority of X-ray tubes meet the requirements specified in the binding regulations. Med Pr 2017;67(4):491-496.