MDS PREP
The scientist who discovered that caries was the most common cause of extraction of teeth was
1. Allen
2. Smith
3. Hotz
4. Rush
Radiology
Answer: 1
The scientist who discovered that caries was the most common cause of extraction of teeth was Allen.
Submentovertex is useful in viewing
1. Body of mandible
2. Fractures of zygomatic arch
3. Fractures of base of skull
4. All of the above
Radiology
Answer: 4
Submentovertex is useful in viewing all of the above: body of mandible, fractures of zygomatic arch, fractures of base of skull.
If shorter exposure time is needed for exposing dental firm
1. kVp can be increased
2. Mili ampere is decreased
3. Long cone can be used
4. Lead diaphragm is removed
Radiology
Answer: 1
If shorter exposure time is needed for exposing dental film, kVp can be increased.
Image of a hair appears on a radiograph which was exposed in a cassette. The hair would have been located in all of the following to produce this image except in
1. On the front of the cassette
2. Between film and front intensifying screen
3. Between film and back intensifying screen
4. On the film during development
Radiology
Answer: 4
Image of a hair appears on a radiograph which was exposed in a cassette. The hair would have been located in all of the following to produce this image except on the film during development.
Ankylosis of TMJ can be best viewed in
1. Lateral oblique view
2. Lateral view
3. Transcranial
4. PA view
Radiology
Answer: 3
Ankylosis of TMJ can be best viewed in transcranial view.
Yellowish-brown staining of the IOPA dental X-ray film is due to
1. Immersion in fixer without washing
2. Increased temperature of developer
3. Increased exposure time
4. Drying away of the developer solution
Yellowish-brown staining of the IOPA dental X-ray film is due to immersion in fixer without washing.
"Step ladders" effect in PA views of skull is found in
1. Sickle cell anaemia
2. Ameloblastoma
3. Osteogenic sarcoma
4. Ewing"s sarcoma
Radiology
Answer: 1
The "step ladders" effect in PA views of the skull is found in sickle cell anaemia.
An intraoral periapical X-ray is taken for evaluation of impacted third molar. Another X-ray is taken with downward angulation to first one. If third molar is lingual impaction it will appear to
1. Move downward in relation to inferior alveolar canal
2. Move upward in relation to inferior alveolar canal
3. Be stable in relation to inferior alveolar canal
4. None of the above
Radiology
Answer: 1
If a third molar is lingually impacted, it will appear to move downward in relation to the inferior alveolar canal when taking a second X-ray with downward angulation.