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.Management Sciences
Category: Oral Histology
In cap stage, regulating factor for cusp shape formation is present in____________?
A. Dental papilla
B. Dental follicle
C. Inner enamel epithelium
D. Enamel Knot
The cementuoenamel junction is approximately at the level at which the root canal becomes_____________?
A. Twisted
B. Curved
C. Pulp chamber
D. Lateral canal
The small ridges, perikymata, seen on facial surfaces of canines are the result of_____________?
A. Hyperplasia
B. Hypoplacification
C. Normal development
D. Interstitial development
Functional importance of maxillary sinus is______________?
A. Lightening of skull weight and production of bactericidal lysozyme to the nasal cavity
B. Protects the brain against exposure to cold air by arresting air in sinus temporarily
C. Resonance of voice and enhancement of faciocranial resistance to mechanical shock
D. All of the above
The size of apical foramen of maxillary teeth in adult is______________?
A. 0.4 mm
B. 0.3 mm
C. 0.2 mm
D. 0.7 mm
Inorganic content of enamel is about______________?
A. 35%
B. 50%
C. 4%
D. 96%
Korffs fibres are seen in______________?
A. Mantle dentin
B. Secondary dentin
C. Reactionary dentin
D. Indeed dermal tubules
Enamel can act in a sense like a_______________?
A. Permeable membrane
B. Impermeable membrane
C. Semipermeable membrane
D. Infrapermeable membrane
During the formation of primary teeth_______________?
A. Enamel forms more cervically than dentin
B. Enamel forms faster than dentin
C. Dentin forms faster than enamel
D. Processes of their cells remain in content with each other
Length of enamel rods is_____________?
A. Greater than the thickness of enamel
B. Less than the thickness of enamel
C. Equal to the thickness of enimal
D. None of the above
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