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

# The extra cellular polysaccharide synthesized by cariogenic streptococci in the presence of excess sucrose are best described as:
A. Mucopolysaccharide
B. Dextran-like glucan
C. Glycogen like glucan
D. Amylopectin

# Organism involved in smooth surface caries is: 1. Streptococcus mutans 2. Actinomyces viscosus 3. Lactobacillus 4. Campylobacter
A. only 1
B. only 2
C. 1 and 3
D. All of the above

# In patient with reduced salivary flow the carious incidence is:
A. more than the patient with normal salivary flow
B. less than the patient with normal salivary flow
C. unaffected
D. none of the above

# Which of the following is cariogenic ?
A. Selenium
B. Strontium
C. Vanadium
D. Molybdenum

# The number of dentinal zones in dentinal caries is :
A. one
B. two
C. four
D. five

# Dental caries is associated with:
A. Streptococcus agalactiae
B. Streptococcus mutans
C. Streptococcus bovis
D. Streptococcus anginosus

# Widely accepted theory of dental caries is :
A. Proteolytic theory
B. Proteolytic chelation theory
C. Acidogenic theory
D. Autoimmune theory

# The correct order of microscopic zones of dentinal caries starting from the DEJ is :
A. Zone of sclerosis, decalcification zone, bacterial invasion
B. Bacterial invasion, decalcification zone, zone of sclerosis
C. Zone of sclerosis, bacterial invasion, decalcification zone
D. Decalcification zone, Zone of sclerosis, bacterial invasion