Question: Roots of primary and secondary teeth are different in that the primary roots are more divergent and flaring. The other difference _____________?

• 1. Primary roots show less a accessory and lateral canals
• 2. Primary roots resorb more easily
• 3. Primary roots are shorter
• 4. None of the above

Question: How many roots does a primary maxillary first molar have ___________?

• 1. One
• 2. Two
• 3. Three
• 4. Four

Question: How many cusps does the crown of the maxillary first primary molar have ?

• 1. 2
• 2. 3
• 3. 4
• 4. 5

Question: The largest mesiodistal diameter in primary dentition is____________?

• 1. Mandibular 1st molar
• 2. Mandibular2nd molar
• 3. Maxillary 2nd molar
• 4. None of the above

Question: During the development of a tooth, sound coalescence of the lobes results in_____________?

• 1. Grooves
• 2. Fissures
• 3. Cusps
• 4. All of the above

Question: The crowns and roots of primary molar at their cervical portions are more____________?

• 1. Slender mesiodistally
• 2. Slender anteroposteriorly
• 3. Bulkier mesiodistally
• 4. Buliker anteroposteriorly

Question: The pulp of first primary molar contains________________?

• 1. Four pulp horn and three root canal
• 2. Three pulp horn and three root canal
• 3. Two pulp horn and two root canal
• 4. Two pulp horn and three root canal

Question: What is the thickness of the layer of primsless enamel found in primary teeth_____________?

• 1. 25 μm
• 2. 50μm
• 3. 75μm
• 4. 100μm

Question: The direction of enamel rods in decidous teeth is_____________?

• 1. Same as permanent teeth
• 2. Inclined in an apical direction in the cervical third of crown
• 3. Inclined in an occlusal direction in the cervical third of crown
• 4. None of the above

Question: With respect to their permanent successors the sum of the mesidodistal diameters of the first and second decidous molar is generally ____________?

• 1. Less
• 2. Greater
• 3. The same
• 4. Not related