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MCQs on Dental caries Part 3


# Streptococcus mutans is considered to be a principal etiologic agent of caries because it produces acid and it:
A. forms a gelatinous matrix
B. metabolizes substrate from saliva
C. derives energy from enamel constituents
D. lives symbiotically with lactobacillus

# Miller put forth the acidogenic theory of dental caries in the year:
A. 1890
B. 1920
C. 1924
D. 1980

# For a bacterium to be seriously considered in the etiology of dental caries, it must :
A. exist regularly in the dental plaque
B. produce extracellular amylopectins
C. be lethal for gnotobiotic animals
D. produce intracellular dextrans

# Initiation of dental caries depends upon:
A. formation of large amount of acid
B. availability of carbohydrate food
C. viscosity of saliva
D. Localisation of acid over tooth surface

# Caries, all are true except:
A. Lactobacillus is the main causative organism in plaque
B. Smooth surface caries occur due to streptococcus mutans
C. Pit and fisssure caries can be prevented by using pit and fissure sealants
D. Fluorides help in reducing caries incidence


# The enzyme glucosyl transferase secreted by Streptococcus mutans synthesizes glucans from:
A. Glucose
B. Fructose
C. Sucrose
D. Lactose

# The lateral spread of dental caries is facilitated mostly by the :
A. Enamel spindles
B. Dentinoenamel junction
C. Enamel lamellae
D. Striae of Retzius

# The probable reasons for a high incidence of dental caries in the teenage population relates most directly to:
A. Rapid growth
B. Frequency of sucrose intake
C. Negligence in visiting the dentist
D. Carelessness in oral hygiene habits

# In a caries free individual, the saliva has:
A. low buffering capacity for acids
B. medium buiffering capacity for acids
C. High buffering capacity for acids
D. Buffering capacity of saliva is independent of caries incidence

# Early invading bacteria in carious lesions are called:
A. Microcosm
B. Pioneer bacteria
C. Advancing bacteria
D. Anaerobic bacteria

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MCQs on Dental caries Part 2


# Streptococcus mutans is involved in dental caries initiation. Other bacteria also involved is:
A. S. sarcinus
B. S. macae
C. S. sanguis
D.S. salivarius

# The dietary carbohydrate most likely involved in etiology of dental caries is :
A. Glucose
B. Sucrose
C. Dextran
D. Polysaccharide

# Bacteria responsible for initiation of caries is :
A. Actinomyces
B. Streptococcus mutans
C. Lactobacillus
D. Streptococcus viridans

# What is the pH at which initiation of caries begins?
A. 4.3-4.5
B. 5.2-5.5
C. 4.9-5.1
D. 3.5-4.5

# Oral foci of Miller's are seen in :
A. Dental caries
B. Lichen planus
C. Herpes simplex
D. Syphilis


# In the earliest stages of carious lesion, there is loss of :
A. Enamel cuticle
B. Interprismatic substance
C. Organic matrix
D. Enamel lamellae

# Smooth surface caries is characterized by spread of caries in enamel and dentin as cones. These alignment in enamel and dentin is:
A. Base to base
B. Apex to base
C. Apex to apex
D. None of the above

# Least cariogenic among these:
A. Raw starch
B. Cooked starch
C. Sucrose
D. Fructose

# Which tooth in the permanent dentition is the most susceptible to dental caries ?
A. Maxillary first premolar
B. Maxillary second molar
C. Mandibular first molar
D. Mandibular second molar

# Turbid dentin in carious tooth is all EXCEPT:
A. Zone of bacterial invasion
B. Zone which cannot be remineralised
C. Zone in which collagen is irreversibly denatured
D. Zone that need not be removed before restoration

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MCQs on Dental Caries


# Lactobacilli are numerous in carious lesions because they:
A. Are the main causative agent
B. Can produce insoluble extracellular polysaccharides
C. Can attach to smooth enamel surfaces
D. Are secondary invaders

# Starch is considered to be less cariogenic than monosaccharides and disaccharides because it
A. Does not diffuse through plaque
B. is rapidly hydrolysed in the mouth
C. enhances remineralisation
D. raises the pH in the oral cavity
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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
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