MCQs on Oral Histology - Development and Growth of Teeth Part 4

# Morphological stages of tooth development are explained based upon:
A. Shape of enamel organ
B. Shape of tooth germ
C. Functions of enamel organ
D. Shape of dental papilla

# The disturbances occured during "calcification" stage of tooth development is seen in:
A. Peg laterals
B. Microdontia
C. Supernumerary tooth
D. Interglobular dentin

# Tooth develops from:
A. Ectoderm, mesoderm
B. Ectoderm
C. Mesoderm
D. Ectoderm and endoderm

# Which of the following is not an ectomesenchymal derivative?
A. Dentin
B. Cementum
C. Pulp
D. Enamel

# The relationship between the pulpal and periodontal tissue complex beegins during dental development at:
A. Adolescent stage
B. 5-10 years
C. Embryonic stage
D. None of the above


# 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 cells of the enamel organ which differentiate into future ameloblasts are:
A. Cells of inner enamel epithelium
B. Cells of outer enamel epithelium
C. Cells of stellete reticulum
D. Cells of stratum intermedium

# The cap stage in tooth development is characterized by:
A. Morphodifferentiation
B. Reversal of functional polarity
C. Formation of Hammock ligament
D. Increased mitotic activity

# The transitory structures that may be seen during early tooth development are:
A. Enamel Knot
B. Enamel Navel
C. Enamel Cord
D. All of the above

# During cap stage, signalling in odontogenic epithelium is done by:
A. Dental follicle
B. Enamel knot
C. Dental papilla
D. Inner enamel epithelium

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MCQs on Oral Histology - Development and Growth of Teeth Part 3

# High levels of albumin is present in:
A. Inner enamel epithelium
B. Outer enamel epithelium
C. Stellate reticulum
D. Stratum intermedium

# Nutrition for ameloblasts after the first layer of enamel is formed is:
A. Dental sac
B. Odontoblastic process
C. REE
D. Dental Papilla

# Membrana preformativa is seen in:
A. Bell stage
B. Cap stage
C. Bud stage
D. Advanced bell stage

# Enamel pearls are found in:
A. Occlusal surface of premolars
B. Furcation areas of permanent molars
C. On the incisal edges of incisors
D. None of the above

# Which statement is correct ?
A. Enamel cannot form in absence of dentin
B. The formation of enamel and dentin are independent of each other
C. Enamel formation can occur in absence of dentin
D. None of the above

# Atypical or osteodentin is formed due to disturbance during :
A. Morphodifferentiation
B. Histodifferentiation
C. Apposition
D. Initiation

# Any insult to cells in apposition stage results in :
A. Hutchinson's incisor
B. Osteodentin formation
C. Enamel Hypoplasia
D. Anodontia

# Order of development of tooth germ is :
A. Bell-bud-cap
B. Cap-bell-bud
C. Bud-cap-bell
D. Bell-cap-bud

# Cementum formation is seen in:
A. After dentin formation
B. Before dentin formation
C. Both are formed at same time
D. None of the above

# Stellate reticulum is seen in :
A. Dental lamina
B. Enamel organ
C. Hertwig's root sheath
D. All of the above

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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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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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