MDS PREP
Cervical burnout refers to
1) Cementoenamel junction misidentified as caries
2) Sun burns caused on neck
3) Root surface caries at cementoenamel junction
4) None of the above
Radiology
Answer: 1
Explanation: Cervical burnout is an optical illusion that occurs on dental radiographs, where the area around the cementoenamel junction appears darker due to the difference in density between the enamel and the underlying dentin. This can lead to misinterpretation as caries.
Objects which cause attenuation of X-ray beam are shown as............in image
1. Radiolucent
2. Radiopaque
3. Gray
4. None of the above
Radiology
Answer: 2
Objects which cause attenuation of X-ray beam are shown as radiopaque in an
image.
Radiopaque materials absorb or block X-rays, leading to a reduced transmission
of the X-ray beam. This results in the appearance of white areas or shadows on
the X-ray image, indicating the presence of dense structures like bone, metal
restorations, or calculi. Radiolucent structures, on the other hand, allow
X-rays to pass through more freely, resulting in dark areas on the image.
Foreshortening of radiographic image results when central X-ray is
1. Parallel to object and film
2. Parallel to object but not to film
3. Perpendicular to film but not to object
4. Perpendicular to object but not to film
Radiology
Answer: 3
Foreshortening of the radiographic image results when the central X-ray is perpendicular to the film but not to the object.
In radionuclide imaging the most useful radiopharmaceutical for skeletal imaging is
1. Gallium 67
2. Technetium-sulphur-colloid
3. Technetium-99m
4. Technetium-99m linked to Methylene disphosphonate
In radionuclide imaging, the most useful radiopharmaceutical for skeletal imaging is Technetium-99m linked to Methylene diphosphonate.
Multiple radiolucencies are common in all of the following except
1. Multiple myeloma
2. Hyperparathyroidism
3. Osteopetrosis
4. Metastatic tumours of bone
Radiology
Answer: 3
Multiple radiolucencies are common in all of the following except osteopetrosis.
Minimal dentinal destruction to get evident on the radiograph
1) 30 microns
2) 40 microns
3) 200 microns
4) 300 microns
Radiology
Answer: 2
Radiographic detection of carious lesions or dentinal destruction typically requires a certain threshold of loss of tooth structure. Studies have shown that a loss of approximately 40 microns of dentin is necessary for a radiograph to show evidence of carious lesions.
The TMJ view that is used to view fractures of neck of condyle is
1. Trancranial
2. Infracranial
3. Both the above
4. None of the above
The TMJ view that is used to view fractures of the neck of the condyle is infracranial.
Imaging technique with MAX radiation exposure to patient?
1. chest x-ray
2. MRI
3. CT scan
4. bone scan
Radiology
Answer: 3
Explanation: Among the imaging techniques listed, a CT (computed tomography) scan typically involves the highest radiation exposure to the patient. This is due to the multiple X-ray images taken from different angles to create cross-sectional images of the body.