Rapid Palatal Expansion

# Typically rapid palatal expansion is done with a jack screw that is activated at the rate of:
a) 1.0 to 2.0 mm/week
b) 1.0 to 2.0 mm/day
c) 0.5 to 1.0 mm/week
d) 0.5 to 1.0 mm/day   

The correct answer is D. 0.5 to 1.0 mm/day. 

Rapid expansion typically is done with two turns daily of the Jackscrew (0.5mm) activation. This creates 10 to 20 pounds of pressure across the mid palatal suture, which is enough to create microfractures of interdigitating bone spicules. In slow palatal expansion, approximately 0.5mm per week is the maximum rate at which the tissues of the midpalatal suture can adopt. 

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Best space maintainer

# Best space maintainer is: 

a) Active space maintainer

b) Passive space maintainer 

c) Band and loop 

d) Pulpotomised primary tooth

     

The correct answer is D. Pulpotomised primary tooth.

Natural tooth if preserved by endodontic treatment is the best space maintainer because it provides easiness and more patient compliance and doesn't affect the eruption of the succedaneous tooth.

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Respiratory System MCQs Part 1

# Pulmonary surfactant is:
A. Lecithin
B. Dipalmitoyl Phosphatidyl choline
C. Dipalmitoyl Phosphatidine serine
D. Sphingosine

# Heimilch Maneuver is carried out in:
A. Syncope
B. Airway obstruction
C. Carotid blow out
D. Cardiac arrest

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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