Which of the following is dental formula of a 9 years old child_____________?
(A) 6 EDC21/ 6EDC21
(B) 6EDCBA/ 6EDC21
(C) EDC21/EDC21
(D) 76EDC21/ 7EDC21
Beginning of eruption of permanent tooth starts_____________?
(A) After completion of root
(B) When apical third root is still to be formed
(C) When half of the root is still to be formed
(D) when root formation starts
In how many years, the central incisors erupt as permanent teeth ______________?
(A) 8-9 years
(B) 10-12 years
(C) 6-7 years
(D) 17-25 years
The teeth that are retained for the longest period of time are__________________?
(A) Maxillary incisors
(B) Maxillary canines
(C) Mandibular incisors
(D) Mandibular canines
(D) B & D
The process of exfolitation of primary teeth is between_____________?
(A) Seventh and eight years
(B) Seventh and ninth years
(C) Seventh and tenth years
(D) Seventh and Twelfth years
Which of the following is true about calcification of teeth ?
(A) Calcification of primary teeth is almost complete at time of birth
(B) Calcification of all primary teeth and few permanent teeth complete at birth
(C) Calcification of all permanent teeth complete at birth
(D) Calcification of primary teeth starts around birth
The first evidence of calcification of primary anterior teeth begins approximately between ______________?
(A) 14 to 17 weeks in utero
(B) 9 to 12 weeks in utero
(C) 6- to 9 weeks in utero
(D) 17 to 20 weeks in utero
A new tooth is erupting in the mouth of a one and a half year old child. This tooth is most likely to be a decidous___________?
(A) Maxillary central incisor
(B) Mandibular lateral incisor
(C) Maxillary lateral incisor
(D) Maxillary canine
The first macroscopic indication of morphologic development of primary incisors approximately at____________?
(A) 11 weeks in utero
(B) 14 weeks in utero
(C) 16 weeks in utero
(D) 6 weeks in utero
The tooth bud for the third molar is initiated at about the age of______________?
(A) 6th month I.U
(B) 1st year of life
(C) 2nd year of life
(D) 8th year of life