Comparison between permanent and deciduous teeth #WikiDentia

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Dental morphology

1. Total number of deciduous teeth in each quadrant are:

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a. 20

b. 10

c. 5

d. 8

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2. The differences between deciduous and permanent teeth with regards to classes of teeth are:

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a. 3 classes of teeth seen in deciduous dentition

b. 4 classes of teeth seen in deciduous dentition

c. Both of the above

d. None of the above

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3. The dental formula for the permanent dentition is:

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a. I 2/2 C 1/1 M 2/2

b. I 2/2 C 1/1 PM 2/2 M 3/3

c. I 1/1 C 1/1 M 1/1

d. I 2/2 C 2/2 M 2/2

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4. By what age the child would have his/her complete set of deciduous dentition:

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a. 2½–3 years of age

b. 1–2 years

c. 0–1½ years

d. 3½–6 years

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5. The sequence of eruption of maxillary permanent teeth is:

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a. 6 1 2 4 5 3 7 8

b. 6 1 2 3 4 5 7 8

c. 1 2 3 4 5 6 7 8

d. 6 1 2 4 3 5 7 8

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6. Which of the following statements is incorrect?

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a. Crown of deciduous teeth are more wider mesiodistally than cervicoincisally

b. Crowns of permanent anterior are longer and more cervicoincisally and less mesiodistally

c. Deciduous teeth are more constricted at the cervical portion of the crown

d. Permanent teeth are constricted at their necks.

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7. In deciduous dentition, the contact area between molars are:

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a. More broader and flatter

b. Narrower

c. Situated occlusally

d. Both b and c

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8. In comparison to crown size of permanent teeth, the roots of primary teeth are:

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a. Proportionately longer and more slender

b. Proportionately smaller and less slender

c. Proportionately smaller and more slender

d. Proportionately longer and less slender

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9. In permanent dentition, the dentinal tubules are:

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a. Less regular

b. More regular

c. Less irregular

d. More irregular

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10. Direction of enamel rods in the primary teeth at cervical thirds of crown is:

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a. Directed occlusally

b. Directed apically

c. Absent in deciduous teeth

d. Absent in permanent teeth

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11. The number of deciduous and permanent teeth are

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(a) 32 and 20

(b) 20 and 32

(d) 20 and 52

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12. The deciduous teeth are white in colour because the

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(a) Enamel is less mineralized

(b) Enamel does not reflect the colour of the underlying dentin

(d) All of the above

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13. The eruption of the deciduous teeth begins at _______ months after birth.

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(a) 8

(b) 30

(d) 22

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14. Mamelons are seen in the

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(a) Deciduous central incisor

(b) Deciduous canine

(d) Permanent canine

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15. The contact area in the permanent teeth are placed at the

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(a) Middle third

(b) Gingival third

(d) Both a and c

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16. The degree of labial inclination of the apical third of the root of the deciduous teeth is

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(a) 20°

(b) 12°

(d) 8°

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17. The level of furcation of the roots of the deciduous teeth is

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(a) 4 mm from the cervix

(b) 3 mm from the cervix

(d) Both a and c

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18. In deciduous teeth, the accessory pulp canals are situated at the

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(a) Apical region

(b) Furcation area

(d) All of the above

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19. The enamel rods at the cervical region of the deciduous teeth are inclined _______ towards the enamel surface.

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(a) Incisally

(b) Apically

(d) Vertically

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20. The cellular cementum is thick in the

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(a) Apical region of the deciduous teeth

(b) Apical region of the permanent teeth

(d) Cervical region of the permanent teeth

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