MCQs on Oral Histology - Development and Growth of Teeth Part 2

# The formation of the dental lamina is initiated by:
A. Forebrain
B. Rathke's Pouch
C. Neural Crest Cells
D. Odontoblasts

# Accessory canals result from :
A. Defects in cementogenesis
B. Dividing epithelial bridges
C. Break in Hertwig's root sheath
D. Adherent epithelial rests

# The Hertwig's epithelial root sheath is essential to development of the root because it:
A. Gives rise to cementoblasts that produce cementum of the root
B. Moulds the shape of roots and stimulates differentiation of odontoblasts
C. Gives rise to odontoblasts that lay dentin of thee root
D. Remains as an essential constituent of the periodontal ligament

# A supernumerary tooth results from a deviation during:
A. Initiation
B. Differentiation
C. Apposition
D. Calcification


# Which of the following anomalies occur during the initiation and proliferation of tooth development ?
A. Amelogenesis imperfecta
B. Dentinogenesis imperfecta
C. Enamel hypoplasia
D. Oligodontia

# Blood supply of ameloblast for most of its life cycle comes from :
A. Dental papilla
B. Reduced enamel organ
C. Dental sac
D. Dental pulp

# The successors of deciduous teeth develops from:
A. Successional lamina
B. Dental lamina
C. Stellate reticulum
D. Neural ectodermal cells

# Lip furrow band is :
A. Vestibular lamina
B. Successional lamina
C. Dental lamina
D. Basal lamina

# Outer and inner enamel epithelium is first seen in:
A. Bud stage
B. Advanced bell stage
C. Cap stage
D. Bell stage

# Temporary structures in enamel organ are :
A. Enamel cord
B. Enamel knot
C. Both of the above
D. Enamel Cuticle

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MCQs on Oral Histology - Development and Growth of Teeth

# The bud, cap and bell stage of the developing tooth are based on growth of the:
A. Stellate reticulum
B. Dental papilla
C. Enamel organ
D. Dental sac

# Dental lamina is active up to :
A. 1 year
B. 2 years
C. 4 years
D. 5 years

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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