CIT CIT Radiography & Imaging 1 — Questions and Answers
Question 1: Which radiographic view is most commonly used for initial implant site screening because it captures both jaws in a single image?
- Periapical radiograph
- Panoramic radiograph (OPG) (Correct answer)
- Bitewing radiograph
- Occlusal radiograph
Correct answer: Panoramic radiograph (OPG)
A panoramic radiograph provides a broad overview of both jaws, bone levels, sinus floors, and anatomical structures, making it the standard initial screening tool for implant planning.
Question 2: What is the primary diagnostic advantage of cone beam computed tomography (CBCT) over conventional 2D radiography for implant planning?
- Significantly lower radiation dose than periapical X-rays
- Color imaging of soft and hard tissues
- Three-dimensional visualization of bone volume, density, and anatomy (Correct answer)
- Faster image acquisition with no patient positioning required
Correct answer: Three-dimensional visualization of bone volume, density, and anatomy
CBCT provides three-dimensional images that allow clinicians to precisely measure bone height, width, and density while identifying critical anatomical structures before implant placement.
Question 3: What does a radiolucent area surrounding an implant on a periapical radiograph most likely indicate?
- Normal dense cortical bone contact
- Successful early osseointegration
- Possible peri-implant bone loss, infection, or failed osseointegration (Correct answer)
- Artifact caused by the implant's metallic surface
Correct answer: Possible peri-implant bone loss, infection, or failed osseointegration
A radiolucent zone around an implant indicates a lack of bone contact, suggesting peri-implantitis, failed osseointegration, or progressive bone loss around the implant.
Question 4: What is the recommended minimum safety margin of bone between the apex of a mandibular implant and the mandibular canal?
- 1 mm
- 2 mm (Correct answer)
- 5 mm
- 10 mm
Correct answer: 2 mm
A safety margin of at least 2 mm above the mandibular canal is recommended to protect the inferior alveolar nerve from implant encroachment or vibration during drilling.
Question 5: Which CBCT measurement is most critical when selecting the appropriate implant diameter for a planned site?
- Bone height from crest to vital anatomical structures
- Buccolingual bone width at the implant site (Correct answer)
- Radiographic density of the cortical plate
- Horizontal distance to adjacent teeth
Correct answer: Buccolingual bone width at the implant site
The buccolingual bone width determines whether sufficient bone exists to accommodate the implant diameter while maintaining adequate facial and lingual cortical bone walls.
Question 6: What does the Hounsfield Unit (HU) scale measure in CBCT imaging, and how is it used in implant planning?
- Bone height in millimeters above vital structures
- Relative radiodensity of tissues, used to classify bone quality (Correct answer)
- Angular deviation of the planned implant from the vertical axis
- Distance between the implant apex and adjacent nerve canal
Correct answer: Relative radiodensity of tissues, used to classify bone quality
Hounsfield Units measure the radiodensity of tissues in CT imaging, allowing clinicians to assess bone quality (D1–D4 classification) and predict primary stability before implant placement.
CIT CIT Radiography & Imaging 1
Which radiographic view is most commonly used for initial implant site screening because it captures both jaws in a single image?