MCQs on Oral Histology - Enamel Part 3

# The type of fibrous element in enamel is :
A. Tonofilament
B. Keratin like fiber
C. Collagen fiber
D. Vimentin filament

# Calcification in enamel starts at :
A. Enamel Matrix
B. Root
C. CEJ
D. DEJ

# Specific gravity of enamel is :
A. 2.8
B. 3.8
C. 4.8
D. 2.3

# Inorganic content of enamel is about :
A. 35 %
B. 50 %
C. 4 %
D. 96 %

# Length of enamel rods is :
A. Greater than the thickness of the enamel
B. Less then the thickness of the enamel
C. Equal to the thickness of the enamel
D. None of the above


# The diameter of the rod is:
A. 4 micrometer
B. 9 micrometer
C. 7 micrometer
D. 2 micrometer

# Which of the following statement is correct ?
A. In cross sections enamel rods appear hexagonal and resemble fish scales
B. The bodies of rods are near occlusal and incisal surfaces , whereas the tails point cervically
C. The apatite crystals are parallel to bodies and deviate 65 degrees from the tails
D. All of the above

# Which of the following is true about direction of enamel rods?
A. They originate at right angle to dentin surface
B. They are almost vertical near the incisal edge or cusp tip areas
C. In the cervical third of deciduous crowns they are almost horizontal in direction
D. In cervical region of permanent teeth , they deviate in apical direction
E. All of the above

# Thin leaf like structures that extend from enamel surface into the DEJ are :
A. Enamel spindles
B. Enamel lamella
C. Enamel Tufts
D. Perikymata

# Dentinoenamel junction is :
A. Non scalloped
B. Straight
C. Scalloped and the convexities are directed towards dentin
D. Scalloped and the convexities are directed towards enamel

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MCQs on Oral Histology - Enamel

# Perikymata are the external surface manifestations of :
A. Enamel rods
B. Incremental lines of Retzius
C. Nasmyth's membrane
D. Pellicle

# The percentage of inorganic matter in fully developed enamel is about:
A. 66 %
B. 76 %
C. 86 %
D. 96 %

MCQs on Oral Histology - Cementum

# Cementum :

A. Is derived from the sheath of Hertwig
B. Is acellular in the apical third of the tooth
C. Often overlaps the enamel
D. Does not contain collagen fibers

# Cellular cementum and compact bone contain :
A. Sharpey's fibers and elastic fibers
B. Collagen fibers and blood vessels
C. Canaliculi and incremental lines
D. Lacunae and elastic fibers

Respiratory System MCQs

# During inspiration when the diaphragm contracts, the intrapleural pressure becomes:
A. More negative
B. Less negative
C. Positive
D. Equal to the intra-alveolar pressure

# A decrease in the arterial pO2 is seen in:
A. Decrease in hemoglobin concentration of arterial blood
B. Paralysis of inspiratory muscles
C. Sluggish blood flow
D. High altitudes

MCQs on Vascular Supply of Head and Neck

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# The inferior dental artery is a branch of the :

A. Mandibular artery
B. Maxillary artery
C. Pterygomandibular plexus
D. None of the above

# The middle meningeal artery :
A. Enters the skull through the foramen ovale
B. Supplies the superolateral surface of the ipsilateral cerebral hemisphere
C. Runs a subdural course within the cranial cavity
D. Gives an interior branch which runs deep to the pterion

Restorative Materials in Dentistry

After a week long Problem Based Learning(PBL)  Program Conducted, a seminar was conducted dividing the various topics related to dental caries amongst six different group. Our group was allocated the topic " Restorative Materials in Dental Caries" .

MCQs on Benign and Malignant Tumors of Oral Cavity

# Which of the following lesions are seen in Von recklinghausen's disease of skin ?
A. Hemangioma
B. Ameloblastoma
C. Neurofibroma
D. Giant cell fibroma


# In which of the following conditions pulsations or murmur may be detected ?
A. Capillary hemangioma
B. Osteogenic sarcoma
C. Epidermoid carcinoma
D. Osteoid osteoma

# Hereditary hemorrhagic telangiectasia is seen commonly on :
A. Lips
B. Buccal mucosa
C. Tongue
D. Palate