DANB Radiation Health and Safety (RHS) Practice Exam

Which positioning is crucial for correct film exposure for adults?

1. Film should be placed parallel to the long axis of the tooth

2. Film must be placed perpendicular to the beam

3. Both A and B

4. Film can be placed at any angle

The correct answer is: Both A and B

The proper positioning of radiographic film is essential for achieving accurate and diagnostic images in dental radiography. When taking radiographs for adults, the film needs to be positioned in a manner that ensures optimal exposure. Placing the film parallel to the long axis of the tooth ensures that the film captures the entire outline of the tooth, which is vital for accurate interpretation of dental structures. This parallel positioning reduces the risk of distortion and provides a more accurate representation of the tooth’s true size and shape. Additionally, positioning the film perpendicular to the central ray of the x-ray beam is crucial. This alignment allows for uniform exposure across the film, minimizing any overlapping of structures and providing a clearer image. When the film is correctly oriented perpendicularly to the beam, it enhances the sharpness and detail visible in the radiograph. Both these positioning techniques—parallel placement to the tooth and perpendicular alignment to the x-ray beam—are fundamental principles in dental radiography, leading to precise and high-quality images that facilitate accurate diagnosis and treatment planning. Hence, the combination of both positioning methodologies is necessary for correct film exposure in adults.