Radiographic Interpretation And Caries On Radiographs Intro

Question 1

At what ages do permanent molars erupt?

Answer 1

6, 12 and 18

Question 2

How long do molar roots take to fully form?

Answer 2

3 years

Question 3

What name is given to an extra tooth that develops close to the midline of the maxilla?

Answer 3

Mesio-dens

Question 4

What is cervical burnout? (3)

Answer 4

1. Phenomenon caused by relative Lower X-ray absorption on the mesial or distal aspect of teeth, between the edge of the enamel and the adjacent crest of the alveolar ridge
   - due to diminished x-ray absorption, these areas appear relatively radiolucent with ill defined margins.

Question 5

How can cervical burnout affect your diagnosis from radiographs?

Answer 5

Cervical burnout mimics root caries

Question 6

List the criteria for taking different types of radiographs (6)

Answer 6

1. Radiography secondary to clinical examination and full mouth periodontal assessment
2. Pocketing 4-5mm = horizontal bitewings
3. Pocketing =>6mm = vertical bitewings + periapicals if bone not shown
4. Irregular = supplement with periapicals
5. Panoramic useful for overview of all teeth, supplemented by periapicals if required, or full periapicals
6. Periapicals for suspected perio/endo lesions

Question 7

What pocket depth should lead to horizontal bitewings ?

Answer 7

4-5mm

Question 8

What radiograph should be taken if pocket depth =>6mm

Answer 8

Vertical bitewings

Question 9

Why is it important to ensure a 90 degree horizontal angle to the line of arch when taking x-rays?

Answer 9

Avoids overlap of adjacent teeth