A six- year molar begins to calcify at______________?
(A) Six months IU
(B) At birth
(C) 1 years after birth
(D) 3 years age
Which of the following gives the best description of erupted permanent teeth typically seen in a 9- years old______________?
(A) Only molars
(B) All teeth except third molars
(C) 1,2,4,5,6,7 in all quadrants
(D) 1,2,6 in all quadrants
Growth of all permanent teeth except last molars is completed by___________?
(A) 6 years
(B) 8 years
(C) 12 years
(D) 17 years
The root completion of permanent teeth is achieved after __________ years o eruption?
(A) 1-1½
(B) 2-3
(C) 3-4
(D) 4-5
Before eruption the position of permanent mandibular incisor buds relative to primary incisors is_____________?
(A) Superior and facial
(B) Inferior and facial
(C) Superior and lingual
(D) Inferior and lingual
Which of these teeth are highly sturdy and usually the last ones to be lost ?
(A) First molar
(B) Central incisors
(C) Canines
(D) Premolars
In the majority of situations, the first decidous tooth to erupt is the______________?
(A) Mandibular central incisor
(B) Mandibular first molar
(C) Maxillary central incisor
(D) Maxillary second molar
First evidence of calcification of maxillary permanent central incisors occurs at_____________?
(A) 3-4 months
(B) 10-12 months
(C) 2-3 years
(D) 3-4 years
Root completion of the mandibular first molar takes place by the age_______________?
(A) 7-8 years
(B) 8-9 years
(C) 9-10 years
(D) 10 – 11 years