MDS PREP
In pantamograph, if patient places chin in front of focal trough, the structures appear to be
1. Blurred and magnified
2. Blurred and diminished
3. Either magnified or diminished
4. Only blurred
Radiology
Answer: 2
In a pantomograph, if the patient places their chin in front of the focal trough, the structures appear to be blurred and diminished.
Symmetrical widening of periodontal ligament space of one or more teeth is the earliest radiological appearance of
1. Osteosarcoma
2. Multiple myeloma
3. Fibrous dysplasia
4. Paget"s disease
Radiology
Answer: 1
Symmetrical widening of the periodontal ligament space of one or more teeth is the earliest radiological appearance of osteosarcoma.
Mottling is seen due to
1. Fast film
2. Low speed film
3. Motion
4. Scattered radiation
Radiology
Answer: 4
Mottling is seen due to scattered radiation.
Intensifying screen is used in extraoral radiograph to
1. Decrease patient radiation
2. Increase contrast
3. Decrease contrast
4. Collimation
Radiology
Answer: 1
Intensifying screen is used in extraoral radiographs to decrease patient radiation.
The anatomical structure of mandible commonly seen in periapical films of maxillary third molar region is
1) Coronoid process
2) Condylar process
3) Ramus mandible
4) Body of mandible
Radiology
Answer: 1
The coronoid process of the mandible may project into the maxillary third molar region on periapical radiographs when the patient opens their mouth wide. Other structures, like the condylar process or ramus, are less likely to overlap in this region.
Fogging on the radiographs is the result of
1. Increase in humidity
2. Scattered radiation
3. Overdevelopment
4. All of the above
Radiology
Answer: 4
Fogging on the radiographs is the result of all of the above: increase in humidity, scattered radiation, overdevelopment.
Which of the following is a possible cause for a low density radiograph
(light film?)
1. Cold developer
2. over exposure
3. Improper safety light
4. Excessive developing time
Radiology Answer: 1
Overexposure typically results in a darker film, not a lighter one. An improper safety light or excessive developing time would not directly cause a low density radiograph. It is essential to maintain the correct temperature and time in the developing process to achieve a diagnostic image quality. A cold developer will not fully develop the film, leading to a lighter, less detailed image.
Retardation of skeletal maturity can be caused by all except:
1. Chronic renal failure.
2. Hypothyroidism.
3. Protein energy malnutrition (PEM)
4. Congenital adrenal hyperplasia.
Radiology
Answer: 1
Skeletal maturity refers to the developmental stages of the skeletal
system, often assessed through the appearance of growth plates on
radiographs. Various conditions can influence skeletal development:
Chronic renal failure can actually lead to retarded
skeletal maturity primarily due to secondary hyperparathyroidism and
metabolic bone disease associated with the kidney's inability to
properly regulate calcium and phosphate levels. Therefore, this does not
fit as an exception.
Hypothyroidism delays skeletal development because
thyroid hormones are crucial for bone growth and maturation.
Protein energy malnutrition (PEM) affects bone
growth due to insufficient protein intake, which is vital for various
physiological processes, including bone health.
Congenital adrenal hyperplasia can affect skeletal
maturity through hormonal imbalances, particularly due to an excess of
androgens that can stimulate bone maturation.