Shika Hoshasen
Online ISSN : 2185-6311
Print ISSN : 0389-9705
ISSN-L : 0389-9705
Estimation of Radiation Exposure Doses around Image Receptors in Intraoral Radiography
—Comparison of Receptor-holding Methods between the Use of Fingers or a Special Device—
Wataru NishiyamaHiroaki HayashiTetsunari IwataMasahiro IzumiRyuji YokoyaEiichiro ArijiTohru OkazakiAkitoshi Katsumata
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2019 Volume 58 Issue 2 Pages 66-72


Objective: During intraoral radiography, the extent to which fingers are exposed to radiation should be reduced as much as possible. We compared the exposure doses between two image receptor-holding methods, a finger-based method and a method involving special devices. Then, we verified the usefulness of the devices.  Materials and Methods: The maxillary right first molar of a dental x-ray simulator mannequin was chosen as the target tooth for the intraoral x-ray examinations. Irradiation (60kV, 6mA, 0.32s) was performed using a short cone-type x-ray head. Small (10×10×2mm) OSL (optically stimulated luminescence) dosimeter tips were used to measure the radiation doses. In addition to the conventional finger-based method, two types of devices were used to hold the image receptors: the “Smart-grip”, a toothbrush-type device, and the “Smart-wing” system, which combines an occlusion holding device and a rectangular iris. We measured the radiation dose delivered to the back of the receptor when the fingers, “Smart-grip”, and “Smart-wing” were used. In addition to the back of the receptor, the radiation doses at two distant points were also measured. The reverse-side radiation doses of different image receptors (analog film, imaging plates) were also compared.  Results and Discussion: The radiation dose delivered to the fingertips was 0.178mGy/exposure when the image receptor was held with the fingers, whereas it was 0.072mGy/exposure when an x-ray film was used with a sheet of lead foil. The radiation dose delivered to the reverse side of the image receptor was 0.018mGy/exposure when the “Smart-grip” was used. The radiation dose delivered to the handle of the “Smart-grip” was 0.006mGy/exposure, which was almost the same as the background level. When the “Smart-wing” was used, the dose delivered to the back of the image receptor was 0.024mGy/exposure.  Conclusion: It was suggested that the radiation dose delivered to the fingers during intraoral radiography can be markedly reduced by using the “Smart-grip” or “Smart-wing”.

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© 2019 Japanese Society for Oral and Maxillofacial Radiology
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