MDS PREP
Salt-paper appearance is seen in intraoral periapical radiograph of
1. Thalassaemia
2. Sjogren"s syndrome
3. Periodontal abscess
4. Osteoporosis
Radiology
Answer: 1
Salt-paper appearance is seen in intraoral periapical radiograph of thalassaemia.
Arthroscopy of TMJ is useful in
1. Internal derangement
2. Fracture of condyle
3. Ankylosis
4. Hyperplasia
Radiology
Answer: 1
Arthroscopy of TMJ is useful in internal derangement.
Which of the following provides superior definition of soft tissues, bony details and physiologic information about the TMJ joint
1. MRI
2. Pantomograph
3. Arthrography
4. CT scan
Radiology
Answer: 3
The imaging technique that provides superior definition of soft tissues, bony details, and physiologic information about the TMJ joint is arthrography.
Screen films differ form non-screen films in that
1. They are more sensitive to light than X-rays
2. They are more sensitive to X-rays than light
3. They are usually used in intraoral radiography
4. They do not need intensifying screens
Screen films differ from non-screen films in that they are more sensitive to X-rays than light.
In the bisecting technique, the film is placed
1. Parallel to the tooth
2. As close as possible
3. Parallel to the bisector
4. Perpendicular to the bisector
Radiology
Answer: 2
In the bisecting technique, the film is placed as close as possible to the tooth.
Sharpness of image on the film can be increased by
1. Large focal spot
2. Small focal spot
3. Decreased target-skin distance
4. Increased film-object distance
Radiology
Answer: 2
Sharpness of the image on the film can be increased by using a small focal spot.
Loss of lamina dura and ground glass appearance of bone is an early radiographic feature of
1) Osteogenesis imperfecta
2) Hyperparathyroidism
3) Osteopetrosis
4) Osteitis deformans
Radiology
Answer: 2
Hyperparathyroidism is a condition characterized by an
overproduction of parathyroid hormone (PTH), which leads to increased bone
resorption and changes in bone density. The radiographic features associated
with hyperparathyroidism include:
Loss of Lamina Dura: The lamina dura is the thin layer
of dense bone that lines the tooth socket (alveolus). In
hyperparathyroidism, the loss of lamina dura can be observed due to the
increased osteoclastic activity and bone resorption.
Ground Glass Appearance: This refers to a radiographic
appearance of bone that looks hazy or "ground glass" rather than having a
clear, well-defined structure. This appearance is due to the alteration in
bone density and the presence of fibrous tissue replacing normal bone.
Other Options:
Osteogenesis Imperfecta: This condition is characterized
by brittle bones due to a defect in collagen formation. Radiographically, it
may show thin cortices and osteopenia, but not typically a ground glass
appearance.
Osteopetrosis: This is a condition of excessive bone
density due to impaired osteoclast function. Radiographically, it shows
increased radiopacity (dense bones) rather than a ground glass appearance.
Osteitis Deformans (Paget's Disease): This condition is
characterized by disorganized bone remodeling. Radiographically, it can show
a "cotton wool" appearance and enlarged bones, but it does not typically
present with a loss of lamina dura or a ground glass appearance in the early
stages.
Filament in X-ray tube is heated by
1. Step-up high voltage transformer
2. Auto transformer
3. Step-down low voltage transformer
4. Ammeter
Radiology
Answer: 3
The filament in the X-ray tube is heated by the step-down low voltage transformer.