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Meat of Polar Bear may cause:

 # A man during his visit to the Arctic ocean happened to eat meat of polar bear. He suffered from intense headache, drowsiness and vomiting. This is most likely due to:
A. Cold diarrhea
B. Vitamin A toxicity
C. Food allergy
D. Vitamin K toxicity


The correct answer is B. Vitamin A toxicity.

Acute poisoning has been described after consumption of polar bear liver which contains 30,000 IU/g vit A. Single massive ingestion (> 1 million IU) produces intense headache, drowsiness, irritability, rise in intracranial tension, vomiting, liver enlargement and shedding of skin. Due to saturation of RBP, excess retinol esters circulate in the free state or loosely associated with lipoprotein. These have surfactant property which damages tissues.

Treatment consists of stopping further ingestion, supportive measures, and vit E which promotes storage of retinol in tissues and speeds recovery. Most signs regress in a week, some persist for months. Excess intake of carotenoids does not produce hypervitaminosis A, because conversion to retinol has a ceiling.


Number of point angles in class 3 cavity preparation is:

 # Number of point angles in class 3 cavity preparation is:
A. 4
B. 5
C. 3
D. 11



The correct answer is C. 3.

The three point angles are: 
i) Incisal Point Angle
ii) Axiofaciogingival point angle, and 
iii) Axiogingivolingual point angle.




Removal of deep, pulp encroaching caries should be made using:

 # Removal of deep, pulp encroaching caries should be made using:
A. High rotational speeds
B. Low rotational speeds
C. Very high rotational speeds
D. All of the above



The correct answer is B. Low rotational speeds.

In deep carious lesion, wider dentinal tubules are present.(so sensitivity is more, which can be prevented by using coolants during cavity preparation, slow speed of instrument, biocompatible restorative material with suitable base).

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