218.The appearance of streptococcus mutans in pit and fissure caries is usually followed by caries

a.6 to 10 months later
b.2 to 6 months later
c.within 2 months
d.6 to 24 months later


Ans.d.6 to 24 months later


Explanation:Ref sturdevant 4 th ed/pg 83

217.Peak rates for the incidence of new carious lesions occurs how many years after eruption of the teeth

a.1 year
b.2 years
c.3 years
d.At the time of eruption

Ans:c.3 years


Explanation:Ref sturdevant 4th ed/pg 92

216.The minimum depth of a detectable carious lesion on a radiograph is

a.500 micrometer
b.1000 micrometer
c.5000 micrometer
d.8000 micrometer

Ans:a.500 micrometer

Explanation:Ref sturdevant 4th ed pg102