MDS PREP
Lamina dura is
1. Radiographic appearance of alveolar bone proper
2. Radiographic appearance of cortical bone
3. Radiographic appearance of cancellous bone
4. All of the above
Radiology
Answer: 1
Lamina dura is the radiographic appearance of alveolar bone proper.
Inventor of orthopantomographic machine is
1. Hounsfield
2. Roentgen
3. Kell
4. Namata
Radiology
Answer: 4
The inventor of the orthopantomographic machine is Namata.
Injecting radiopaque dye into the joint space to visualize the joint is referred to as
1. Arthroscopy
2. Arthrography
3. Orthropantomography
4. Arthroplasty
Radiology
Answer: 2
Injecting radiopaque dye into the joint space to visualize the joint is referred to as arthrography.
The radiograph showing one of the best view of a fracture of
1. The orbital rim is the 30 degree occipitomental view
2. The orbital floor is the 10 degree occipitomental view
3. The orbital medial wall is the lateral skull view
4. The orbital roof is the lateral skull view
The radiograph showing the best view of a fracture of the orbital floor is the 10-degree occipitomental view.
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.
According to Clark"s rule for localisation of object if tube is shifted mesially to original angulation
1. Buccal objects move mesially
2. Lingual object moves mesially
3. Both buccal and lingual object move distally
4. Both buccal and lingual object move mesially
Radiology
Answer: 2
According to Clark's rule for localization of an object, if the tube is shifted mesially to the original angulation, the lingual object moves mesially.
Horizontal unfavourable or favourable fractures of mandible can be viewed best in
1. Lateral oblique 30 degrees
2. Lateral oblique 15 degrees
3. PA view of mandible
4. Submentovertex view
Radiology
Answer: 1
Horizontal unfavourable or favourable fractures of the mandible can be viewed best in lateral oblique 30 degrees.
Brown discolouration seen in old radiographic films is due to
1. Overdevelopment
2. Underdevelopment
3. Incomplete fixation
4. Exposure to light
Radiology
Answer: 3
Brown discoloration seen in old radiographic films is due to incomplete fixation.