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
E. B & D
The process of exfoliation 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
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
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
Maxillary primary cuspid enamel completion takes place at_?
A. 6 months in utero
B. 6 months after birth
C. 9 months in utero
D. 9 months after birth
First permanent molars begin to calcify at __?
A. 6 months of intra uterine life
B. At birth
C. Before deciduous incisors
D. About 1 year after birth
In anxious parent calls you that her 5- month -old child has still no teeth in his mouth then you should_?
A. Call and do radiographic survey
B. Tell her that it is normal at this age
C. Child has retarded growth
D. Systemic problem
The eruption are of maxillary permanent lateral incisor is__?
A. 8-9 years
B. 6-7 years
C. 10-11 years
D. 8-9 months
