Question: Which tooth in the permanent dentition is the most susceptible to dental caries ?

• 1. Maxillary 1st premolar
• 2. Maxillary 2nd molar
• 3. Mandibular 1st molar
• 4. Mandibular 2nd molar

Question: Smooth surface caries is characterized by spread of caries in enamel and dentin as cones. These alignment in enamel and dentin is____________?

• 1. Base to base
• 2. Apex to base
• 3. Apex to apex
• 4. None of the above

Question: Oral foci of miller’s are seen in_______________?

• 1. Dental caries
• 2. Lichen planus
• 3. Herpes simplex
• 4. Syphilis

Question: Bacteria responsible for initiation of caries is _________________?

• 1. Actinomyces
• 2. Strep. mutans
• 3. Lactobacillus
• 4. Strep. viridans

Question: S. mutans is involved in dental caries initiation Other bacteria also involved is______________?

• 1. S. Sarcinus
• 2. S. macae
• 3. S. sanguis
• 4. S. salivarius

Question: Widely accepted theory of dental caries_____________?

• 1. Proteolytic theory
• 2. Proteolytic chelation theory
• 3. Acidogenic theory
• 4. Autoimmune theory

Question: The number of dentinal zones in dentinal caries is_____________?

• 1. One
• 2. Two
• 3. Four
• 4. Five

Question: In a patient with reduced salivary flow the carious incidence is_______________?

• 1. More than the patient with normal salivary flow
• 2. less than the patient with normal salivary flow
• 3. unaffected
• 4. None of the above

Question: The extra – cellular polysaccharide sythesized by cariogenic streptococci in the presence of excess sucrose are best described as_______________?

• 1. Mucopolysaccharide
• 2. Dextran-like glucan
• 3. Glycogen – like glucan
• 4. Amylopectin

Question: Lactobacilli are numerous in caious lesions because they______________?

• 1. Are the main causative agent
• 2. Can produce insoluble extracellular polysaccharides
• 3. Can attack to smooth enamel surfaces
• 4. Are secondary invaders