CHAPTER 5 Radiology
Two units of radiation were established to measure exposure, dose, and dose equivalent by the International Commission on Radiation Units and Measurements. Two systems are used for each unit: Standard and Système International (SI).
Exposure and risks associated with radiation include those from environment (background) and those associated with direct irradiation of organs. (See the WebLink on the CD-ROM for the ADA and FDA Guide to Patient Selection for Dental Radiographs.)
Proper use of equipment, patient and clinician positioning, and technique can provide acceptable limits to incidental radiation exposure. Advances in dental radiograph technology have reduced scatter radiation, the reason for protective boxes; lead-lined radiograph storage boxes are thus unnecessary and should be discarded, since they contaminated the film. There is controversy over need for lead (or lead equivalent) aprons for patient protection. Note that term “clinician” is used for operator.
|Sex||Male Female||The new patient’s intraoral examination reveals several suspect areas and fractured restorations on the maxillary arch. It has been at least 6 or 7 years since patient has had radiographs taken. The dental hygienist recommends a full-mouth series (FMX). However, the patient is reluctant because of what she has heard about the dangers and misuse of radiation.|
|Chief Complaint||“Boy, the fillings in my upper back teeth are so sensitive! They feel like they are moving when I bite down.”|
Radiographic examination involves intraoral, extraoral, and special imaging techniques to produce high-quality radiographs for use in examination, interpretation, diagnosis of dental conditions and diseases. (See the CD-ROM for WebLink to the ADA/FDA Guide to Patient Selection for Dental Radiographs, which includes the chart Guidelines for Prescribing Dental Radiographs.) These guidelines will allow for ALARA concept, although each case is subject to clinical judgment.