Rx McQ's: DENTAL

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19. The epithelium of the mucous membrane of the mouth is:

A. Simple squamous B. Stratified squamous
C. Simple columnar D. Stratified columnar

ANS.B.

Squamous cells are flattened, pancake-like cells, and when in layers are known as stratified. The stratified squamous cells lining the mucosa of the oral cavity are similar to those lining the outer skin, although less keratinized. They do, however, flake off continuously into the mouth. Simple squamous tissue would be too thin and not allow for the constant flaking and replacement. Columnar epithelium is found in both the respiratory system and other organs of the digestive system.

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17.The facio-lingual dimension of the Band and Loop space maintainer should be approximately-

A) 8 mm. B) 3.4 mm. C)4.5 mm D)2.10 mm.

ANS. 8 mm.

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14.Measures of central tendency are:

1.Mean, median, range.
2.Mean, median, mode.
3.Mean, range, standard deviation.
4.Range, mean deviation, standard deviation.

ANS. Mean, median, mode.

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12.In adults, the spinal cord normally ends at:

1. Lower border of L1

2. Lower border of L3

3. Lower border of SI

4. Lower border of L5

____________________

ANS. A

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11. Fluoromica glass ceramic is the other name for

a. Castable dental ceramic b. Leucite (KAlSi2O6)
c. aluminous glass core d. Lithium disilicate
_______________________________________
Ans. A. The first commercially available castable dental ceramic was Dicor. The mica crystals formed in Dicor are based on the composition SiO2 · K2O · MgO · Al2O3 · ZrO2. and fluorides are added to the mixture to help produce a degree of fluorescence in the finished prosthesis. For this reason, this formulation is called a fluoromica glass ceramic. A wax pattern is fabricated by a lab technician, just as it would be done for a gold casting. An ingot of the castable ceramic is placed in a special crucible, melted, and centrifugally cast at a temperature of 1380°C.

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10. Consistent radiographs are obtained by:

a)constant mA and kvp
b)automatic processing
c)using long cone technique
d)fixed processing time
_____________________________
Answer: B(ref: w&p 5th edition , 103 pg)

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9.

9. Difference between physical characteristics of a file & reamer is:
A. The cross-section of reamers is square and files are triangular in cross section.
B. The numbers of flutes on the blade are more in files than in reamers.
C. The reamers have more flutes in the blade.
D. Files have two superficial grooves to produce flutes in a double helix design.
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9. Answer is: B- The numbers of flutes on the blade are more in files than in reamers.
(Ref. Grossman 11th Ed/ 195) Repeat AIIMS-MAY-06.