Dental Radiology and Imaging Flashcards
6 cards from real MJDF practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Dental Radiology and Imaging flashcards as text
Cone Beam Computed Tomography (CBCT) in dentistry is best indicated for:
Answer: Assessment of complex 3D anatomy such as impacted teeth, implant planning, and endodontic assessment of root morphology
CBCT provides 3D volumetric imaging that is invaluable for complex cases requiring spatial anatomy assessment — but its higher radiation dose means it should only be used when 2D imaging is insufficient.
Which radiographic sign is MOST characteristic of a lateral periodontal cyst?
Answer: A well-defined, often corticated, radiolucent lesion located laterally on the root of a vital tooth
A lateral periodontal cyst appears as a well-defined, often corticated (with a white border), teardrop-shaped radiolucency located laterally along the root of a vital tooth — distinguishing it from periapical lesions associated with non-vital teeth.
What is the most important consideration when deciding whether to take a dental radiograph during pregnancy?
Answer: The clinical benefit of the radiograph must outweigh the minimal radiation risk, and the examination should be carried out if clinically justified
Dental radiographs are not contraindicated in pregnancy. The radiation dose from dental radiographs is extremely low, and if clinically justified, they should be taken. Delaying necessary treatment due to unfounded radiographic fears can harm both mother and foetus.
Ghost images on a panoramic radiograph are caused by:
Answer: The contra-lateral X-ray beam creating a mirror image of structures on the opposite side
Ghost images (ghost shadows) on OPG are caused by the primary X-ray beam projecting the image of a radiopaque structure on one side of the patient onto the opposite side of the image as a blurred, higher and distorted shadow.
Which of the following statements about digital radiography in dentistry is TRUE?
Answer: Digital radiography reduces radiation dose, allows immediate image viewing, and enables digital image manipulation for enhanced diagnosis
Digital radiography offers reduced radiation dose (particularly with photostimulable phosphor sensors or solid-state sensors), immediate image display, and tools such as contrast adjustment and measurement that enhance diagnostic capability.
The term 'lamina dura' on a dental radiograph refers to:
Answer: The radiopaque white line of compact cortical bone lining the tooth socket (alveolar proper)
The lamina dura is the compact cortical bone (bundle bone) lining the tooth socket — it appears as a continuous white radiopaque line around the root and its continuity and appearance are important clinical indicators.