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

<<<PREVIOUS PAGE     NEXT PAGE>>>

REVISE THESE MCQs in THIS VIDEO  

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

<<<PREVIOUS PAGE      NEXT PAGE >>>

REVISE THESE MCQs in THIS VIDEO  

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