MCQs on Oral Histology - Enamel Part 6

# Gnarled enamel is seen in :
A. Proximal surface of tooth
B. Cervicl region of tooth
C. Cusp tips of tooth
D. All of the above

# The key hole pattern appearance in the cross section is a feature of :
A. Aprismatic enamel
B. Prismatic enamel
C. Intertubular dentin
D. Intratubular dentin

# Neonatal lines are seen in :
A. Enamel of deciduous incisors
B. Enamel of permanent incisors
C. Enamel of premolars
D. Dentin of all teeth as it is formed first

# The shallow furrows on the enamel surface where Striae of Retzius end are known as:
A. Cracks
B. Pellicle
C. Perikymata
D. Enamel lamellae
# Maximum amount of phosphate is seen in:
A. Bone
B. Enamel
C. Gingiva
D. Dentin

# Dark bands that are present in enamel rods at intervals of 4 micrometers are:
A. Neonatal Bands
B. Cross striations
C. Striae of Retzius
D. Hunter Schreger bands

# Which of the following is correct about enamel crystals?
A. Same as dentin crystals
B. Contains organic portion in the center
C. Roughly hexagonal in shape
D. Their diameter is about 5 microns in size

# Water content in enamel by volume is :
A. 2-3 %
B. 6-7 %
C. 20- 25 %
D. 10-12 %

# Non acidic, non ionic protein which helps in enamel mineralization:
A. Tuftelin
B. Sheathlin
C. Enamelin
D. Amelogenin

# Enamel can act in a sense like a :
A. Permeable membrane
B. Impermeable membrane
C. Semipermeable membrane
D. Infrapermeable membrane

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MCQs on Oral Histology - Enamel Part 5

# The small ridges , perikymata, seen on facial surfaces of canines are the result of:
A. Hyperplasia
B. Hypocalcification
C. Normal development
D. Interstitial development

# Among the following , the structure that is most calcified is :
A. Enamel lamella
B. Enamel rod
C. Enamel spindle
D. Enamel tuft

# Enamel spindles are formed by :
A. Cracks
B. Ameloblasts
C. Odontoblasts
D. Hypocalcified Rods

# Neonatal line is also referred to as:
A. Retzius line
B. Line of cross striations
C. Incremental lines
D. Line of enamel tufts
# Incremental lines of Retzius appear:
A. as lines in the enamel running at right angles to the enamel surface
B. as lines in the dentin running at right angles to the Dentinoenamel junction
C. in enamel and follow the apposition pattern
D. in dentin and follow the apposition pattern

# Nutritional supply of ameloblasts during most of their life cycle is from the:
A. Dental pulp
B. Odontoblastic processes
C. Dental sac
D. Reduced dental organ

# Enamel rods at the cervical area and at the occlusal edge and incisal tip in permanent teeth are :
A. Straight
B. Shallow
C. Bent
D. Curved

# Metalloproteins are used in which stage of amelogenesis ?
A. Organising
B. Formative/Secretory
C. Protective
D. Desmolytic

# The thickness of prismless enamel in deciduous teeth is:
A. 25 micrometer
B. 50 micrometer
C. 75 micrometer
D. 100 micrometer

# The class of low molecular weight calcium binding proteins seen predominantly in developing enamel are:
A. Enamelin
B. Amelogenin
C. Tuftelin
D. Ameloplakin

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MCQs on Oral Histology - Enamel Part 4

# Hertwig's root sheath is formed from:
A. Stratum intermedium
B. Stellate reticulum
C. Outer enamel epithelium
D. Cervical loop

# Chronological hypoplasia is :
A. Hypoplasia of local origin
B. Hypoplasia of systemic origin
C. Hypoplasia of hereditary origin
D. None of the above

# Moth eaten appearance of enamel is seen in :
A. Odontodysplasia
B. Amelogenesis Imperfecta
C. Dentin dysplasia
D. Mottled enamel

# Formation of dentin by odontoblasts begin in :
A. Morphogenic stage
B. Organizing stage
C. Desmolytic stage
D. Formative stage

# Which of the following is correct ?
A. Each rod is formed by four ameloblasts
B. Each ameloblast contributes to four different rods
C. Head of the rod is formed by one ameloblast, and tail is formed by three other ameloblasts
D. All of the above
# The striking difference between enamel and other mineralised tissue is :
A. Presence of high percentage of organic matrix
B. Presence of incremental lines
C. Enamel has high reparative capacity
D. Most of the organic component is lost during mineralisation

# Shape of enamel rod is :
A. Key hole or paddle shaped
B. Square
C. Round
D. None of the above

# Enamel is laid down :
A. Mainly by odontoblasts
B. Mainly by ameloblasts
C. Only by odontoblasts
D. Only by ameloblasts

# Ameloblast is :
A. A cell from which tooth enamel is formed
B. A tissue from which tooth erupts
C. A tumour of the jaw
D. responsible to form dentin

# Synthesis of enamel matrix proteins occurs in the :
A. Outer enamel epithelium
B. Ameloblast
C. Stratum intermedium
D. Stratum granulosum

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CNS, MSK and Special Senses MCQs part 5

41. Anterior limit of the infratemporal fossa is:
Lateral pterygoid plate
Maxillary posterior wall
Pterygomaxillary fissure
Mastoid process

42. Muscle which pulls the disk of TMJ downward is:
Lateral pterygoid
Medial pterygoid
Digastric
Mylohyoid

43. The orbital opening is somewhat:
Quadrangular
oblong
circular
oval

44. The suture between the two halves of the
 frontal bone is:
Mendosal suture
symphysis
Coronal suture
Metopic suture

45. Deepest layer of deep cervical fascia is:
Prevertebral
Carotid sheath
Pretracheal
Temporal

46. Submandibular gland is situated in:
Digastric triangle
Carotid triangle
Muscular triangle
Deep to hyoglossus muscle

47. Duct of parotid gland crosses over the masseter muscle and pierces the :
Superior constrictor
Lateral Petrygoid
Buccinator
Zygomaticus major

48. Surgical excision of parotid gland endangers which of the following structures:
Hyoglossal nerve
Motor nerve of the muscles of mastication
External Carotid artery, auriculotemporal nerve, facial nerve
Lesser occipital nerve and the spinal accessory nerve

49. Duct of Rivinus is associated with :
Parotid gland
Submandibular gland
Sublingual gland
Minor salvary gland

50. Cricothyroid is supplied by:
Vagus
Recurrent laryngeal nerve
Superior laryngeal nerve
Hypoglossal nerve

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