Ideal Orthodontic Tooth Movement

# Resorption in case of ideal orthodontic tooth movement should be:
a) Undermining
b) Indirect
c) Frontal
d) Necrotic     

The correct answer is C. Frontal. 

Application of light orthodontic forces will result in frontal/ direct resorption. Frontal resorption occurs only when the forces applied are close to the capillary pressure, i.e. 20 -26 gm/ sq. cm of root surface area. 

Oppenheim and Schwarz have been given credit for discovering the optimum orthodontic force levels usually light continuous forces are recommended for tooth movement.

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Scissor Bite

# Scissor bite is seen in:
a) Anterior cross-bite
b) Complete deep-bite
c) Total maxillary lingual cross-bite
d) Total maxillary buccal cross-bite   

The correct answer is D. Total maxillary buccal cross bite. 

When all the teeth are in scissors bite, the condition is called as Bodie syndrome.

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Charcot Leyden Crystals

# Charcot Leyden crystals are breakdown products of:
A. Basophils
B. Eosinophil granules
C. Bile
D. Cholesterol granules or clefts

The correct answer is B. Eosinophil granules.

Charcot-Leyden crystals are seen in bronchial asthma. They are diamond shaped crystal seen in association with eosinophils. Repeated attacks may induce chronic bronchitis condition which in turn may develop into emphysema. 

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Oxygen in histotoxic hypoxia

# The beneficial effect of oxygen therapy in histotoxic hypoxia is about:
A. 0 %
B. 50 %
C. 100 %
D. 30 %

The correct answer is A. 0%

Histotoxic hypoxia refers to hypoxia secondary to the inability of the cells to utilize oxygen.

In histotoxic hypoxia, oxygen therapy is  not beneficial as tissue oxygenation is itself defective. 

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