Radiographic Techniques and Errors Flashcards
6 cards from real RDA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Radiographic Techniques and Errors flashcards as text
What is the standard full-mouth series (FMX) for an adult patient?
Answer: 14 periapical and 4 bitewing radiographs (18 images total)
A standard adult full-mouth series (FMX) typically consists of 14 periapical radiographs (showing all root structures) and 4 bitewing radiographs (showing interproximal bone and contacts), totaling 18 images.
What type of radiograph is used to examine the floor of the mouth, calculi in salivary glands, or impacted teeth?
Answer: Occlusal radiograph
Occlusal radiographs use a larger film/sensor placed on the occlusal plane to image larger areas such as the floor of the mouth, palate, salivary stones, and impacted teeth.
What is the recommended X-ray selection criteria principle for dental radiographs?
Answer: Radiographs should be prescribed based on individual patient needs and clinical examination
The principle of 'selection criteria' (ADA/FDA guidelines) requires that radiographic prescriptions be based on individual patient needs, clinical examination, dental history, and risk assessment — NOT on routine schedules.
Which of the following describes the ALARA principle in dental radiography?
Answer: Keep radiation exposure as low as reasonably achievable by using the minimum exposure necessary for diagnostic quality
ALARA (As Low As Reasonably Achievable) means minimizing radiation exposure while still obtaining diagnostically adequate images through technique optimization, proper equipment, shielding, and selection criteria.
What causes a herringbone (tire-track) pattern artifact on a dental radiograph?
Answer: Film was placed backward in the patient's mouth
A herringbone (tire-track or reverse pattern) artifact appears when the film is placed backward (with the lead foil side facing the X-ray source), causing the embossed pattern of the foil backing to be imprinted on the image.
What is the function of the bitewing radiograph?
Answer: To detect interproximal caries and evaluate the height of alveolar crestal bone
Bitewing radiographs show both maxillary and mandibular posterior teeth on the same image, making them ideal for detecting interproximal caries and evaluating alveolar bone height.