LESSON 4 - RADIOGRAPHIC EXPOSURE TECHNIQUES
Section I. INTRODUCTION
Diagnostic and treatment procedures cannot be performed satisfactorily without a variety of radiographic exposure techniques. The dental specialist should be able to properly position the patient, the tube head, and the x-ray film for intraoral or panoramic film exposures. He must also be able to read and to follow manufacturer's instructions accurately.
4-2. INTRAORAL RADIOGRAPHY
Most dental radiographs are made on intraoral film. An intraoral radiograph is made with the film held in the mouth during exposure. Intraoral radiographs taken in closer relation to the object give more detail than is possible with extraoral radiographs, which are taken from outside the mouth, and have less superimposition of shadows.
4-3. TYPES OF INTRAORAL RADIOGRAPHIC FILM AND THEIR PURPOSES
4-4. PLACEMENT OF FILM PACKETS
Several factors must be considered in the placement and stabilization of intraoral film packets to achieve satisfactory results.
4-5. PERIAPICAL RADIOGRAPHIC TECHNIQUES
Periapical radiography is designed to give diagnostic images of the apical portions of teeth and their adjacent tissues. A full mouth intraoral examination consists of 14 periapical radiographs with two bite-wing films and provides an image of all teeth and related structures. Single periapical radiographs are often made of individual teeth or groups of teeth to obtain information for treatment or diagnosis of localized diseases or abnormalities. The bisecting (short-cone) and paralleling (long-cone) techniques are two of the most commonly used techniques. Both techniques have advantages and disadvantages. The dental officer's preference determines which technique will be used.
|David L. Heiserman, Editor||
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Revised: May 18, 2013