The successor of the deciduous teeth develops from:

 # The successor of the deciduous teeth develops from:

A. Lingual extension of the dental lamina

B. Labial extension of the dental lamina

C. Buccal extension of the dental lamina

D. Occlusal extension of the dental lamina

The correct answer is A. Lingual extension of the dental lamina

The initiation of the permanent first, second and third molars occurs at the fourth month of intrauterine life, one year after birth and five years after birth respectively. The lingual extension of dental lamina is called successional lamina. Successional lamina is responsible for the development of permanent incisors, canine and premolars. The successional lamina is active from the fifth month in utero (for the permanent central incisor) to ten months of age (second premolar).

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Final stage of tooth development

 # What is the final stage of tooth development?

a. Crown formation.

b. Root formation and eruption.

c. Function.

d. Dentinogenesis and amelogenesis.

The correct answer is C. Function.

Crown formation is followed by root formation and eruption. Root formation and eruption are followed by function. Function is the final stage of tooth development. Dentinogenesis and amelogenesis are followed by crown formation.

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Bilateral nasal placodes appear during:

 # During which week of development do the bilateral nasal placodes appear?

a. Fourth.

b. Fifth.

c. Sixth.

d. Seventh.

The correct answer is b. Fifth.

During the fifth week, the bilateral nasal placodes, or thickened areas of epithelium,

appear in the upper border of the lip.

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Palatal shelf elevation takes place during:

 # Palatal shelf elevation takes place during which prenatal week of development? 

a. Week 7. 

b. Week 8. 

c. Week 9. 

d. Week 10

The correct answer is: B. Week 8.

Palatal shelf elevation occurs during the eighth prenatal week.

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