CBCT Reading in Ortho Flashcards

1
Q

What triggers the need for a CBCT examination

A

Need to know dento-facial anatomy that is not visible from clinical examination and 2D X-ray examination in order to drive better decisions

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2
Q

What are some -ves of CBCT

A

Increased radiation (Esp for kids)
Expensive

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3
Q

What are the radiation dosage issues in the use of CBCT
7

A
  1. Radiation damages tissues
  2. X-rays are a type of EM radiation
  3. Radiation is a carcinogen
  4. Stochastic effects - no threshold radiation dose below which they will not occur
  5. Deterministic effects - no damage until threshold radiation is reached
  6. Children are more radiosensitive than adults (risk x3 for <10)
  7. X-ray effects are cumulative

10x more likely to get cancer than from DPT
ALARA

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4
Q

What are the different Field of Views (FOV) of CBCTs

cm is of spherical volume diameter or cylinger height

A

Large FOV (>15cm):
- TMJ, quantitative ceph and/or airway assessment
- Orthognathic jaw surgery

Medium FOV (10-15cm)
- 1-2 dental arches

Small FOV (<10cm)
- Few teeth, a quad, up to 2 dental arches

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5
Q

What are the British Orthodontic Society’s and Prof Foong’sindications for CBCT

A
  1. Highly selected cases where conventional radiography cannot supply satisfactory diagnostic information
  2. Cleft palate case
  3. Assessment of unerupted tooth position, particularly where resorption is a concern
  4. Identification of root resorption caused by unerupted teeth (upper laterals)
  5. Orthognathic surgery planning

Prof Foong’s:
1. Bone thickness surrounding teeth
2. Tooth impaction and possibility of root resorption and/or ankylosis

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