MDS PREP
A thin radioopaque line running around the curvature of root in IOPA is
1. Lamina dura
2. Lamina propria
3. Lamina limitans
4. Lamina densa
Radiology
Answer: 1
A thin radiopaque line running around the curvature of the root in IOPA is lamina dura.
Fogging of X-ray film affects the contrast of an intraoral film because it
1. Produces phosphorous crystals on the film
2. Decreases film density resulting in a light radiograph
3. Produces white speckles on the firm
4. Increases film density resulting in an overall gray radiograph
Fogging of X-ray film affects the contrast of an intraoral film because it increases film density resulting in an overall gray radiograph.
In reverse Townes projection central X-ray passess through
1. Maxillary sinus
2. Occipital bone
3. Buperior border of petrous
4. Inferior border of petrous
Radiology
Answer: 2
In reverse Townes projection, the central X-ray passes through the occipital bone.
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.
In order to determine anterior-posterior extent of ameloblastma in mandibular molar area, you would like to use following projection
1. Waster view
2. PA view of mandible
3. Distal oblique
4. Lateral oblique view
Radiology
Answer: 3
To determine the anterior-posterior extent of ameloblastoma in the mandibular molar area, the projection used is distal oblique.
"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.
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.
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.