With respect to their permanent successors the sum of the mesidodistal diameters of the first and second decidous molar is generally ____________?
(A) Less
(B) Greater
(C) The same
(D) Not related
Eruption date of decidous maxillary 2nd molar is ______________?
(A) 20 months
(B) 18 months
(C) 24 months
(D) 28 months
What is the amount of time required by erupting premolar to move through 1 mm of bone as measured on a bite – wing radigraph ?
(A) 3-4 months
(B) 4-5 months
(C) 5-6 months
(D) 6-7 months
Kalu, a 6- years – old child, received tetracycline. Noticeable discoloration will be seen in______________?
(A) Premolars, incisors and 1st molars
(B) Canine and 2nd molars
(C) Canines, premolars and2nd molars
(D) Incisors and 1st molars
Calcification of third molar begins at__________________?
(A) 8 months
(B) 18 months
(C) 8 years
(D) 16 years
The time taken for primary tooth root completion after eruption_____________?
(A) 3 years
(B) 1 years
(C) 2 years
(D) 1 month
Calcification of all teeth except last molars are completed by____________?
(A) 2 years
(B) 4 years
(C) 6 years
(D) 8 years
Once the enamel formation is complete, the tooth will erupt after approximately______________?
(A) One year
(B) Two years
(C) Three years
(D) Four years
The correct dentition in a 9- years old child is_____________?
(A) 12 CDE6
(B) 12C456
(C) 123DE6
(D) 123456