The direction of enamel rods in decidous teeth is_____________?
(A) Same as permanent teeth
(B) Inclined in an apical direction in the cervical third of crown
(C) Inclined in an occlusal direction in the cervical third of crown
(D) None of the above
What is the thickness of the layer of primsless enamel found in primary teeth_____________?
(A) 25 μm
(B) 50μm
(C) 75μm
(D) 100μm
The pulp of first primary molar contains________________?
(A) Four pulp horn and three root canal
(B) Three pulp horn and three root canal
(C) Two pulp horn and two root canal
(D) Two pulp horn and three root canal
The crowns and roots of primary molar at their cervical portions are more____________?
(A) Slender mesiodistally
(B) Slender anteroposteriorly
(C) Bulkier mesiodistally
(D) Buliker anteroposteriorly
During the development of a tooth, sound coalescence of the lobes results in_____________?
(A) Grooves
(B) Fissures
(C) Cusps
(D) All of the above
The largest mesiodistal diameter in primary dentition is____________?
(A) Mandibular 1st molar
(B) Mandibular2nd molar
(C) Maxillary 2nd molar
(D) None of the above
How many roots does a primary maxillary first molar have ___________?
(A) One
(B) Two
(C) Three
(D) Four
Roots of primary and secondary teeth are different in that the primary roots are more divergent and flaring. The other difference _____________?
(A) Primary roots show less a accessory and lateral canals
(B) Primary roots resorb more easily
(C) Primary roots are shorter
(D) None of the above