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
Decidous dentition
What is the thickness of the layer of primsless enamel found in primary teeth_____________?
A. 25 μm
B. 50μm
C. 75μm
D. 100μm
Which statement is correct about decidous dentition?
A. Calcification of maxillary primary first premolar is completed at birth
B. Mandibular first molar erupts at one and half years of age
C. The crowns of primary dentition are more yellowish than permanent
D. The primary dentition is initiated at 10th month in uterus
How many cusps does the crown of the maxillary first primary molar have ?
A. 2
B. 3
C. 4
D. 5
Primary dentition period is______________?
A. From birth to 11 years
B. From 6 months to 11 years
C. From 6 months to 6 years
D. From 6 years to 11 years
How many roots does a primary maxillary first molar have ___________?
A. One
B. Two
C. Three
D. Four
Which of the following has the maximum faciolingual diameter of the crown__________?
A. Decidous maxillary 2nd molar
B. Decidous maxillary 1st molar
C. Decidous mandibular 2nd molar
D. Decidous mandibular 1st molar
Among the difference between teeth in the decidous and the permanent dentition is that_____________?
A. Buccal surfaces of the permanent molars are flatter
B. Cervical ridges are more pronounced in permanent molars
C. Root trunks of decidous teeth are larger compared with their overall root lengths
D. Crowns of decidous incisors are wider mesiodistally than their cervico incisal lengths
When viewed occlusally, a primary mandibular second molar closely resembles which of the following mandibular teeth ?
A. Permanent second molar
B. Permanent first molar
C. Second premolar
D. Primary first molar
Resorption of root of primary incisors starts at_____________?
A. 4 yrs
B. 6 yrs
C. 8 yrs
D. 10 yrs
