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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Zone of fusion between the medial nasal and maxillary process

 # The zone of fusion between the medial nasal and maxillary process is referred to as which of the following? 

a. Cleft lip. 

b. Philtrum. 

c. Nasal fin. 

d. Maxillonasal process.

The correct answer is C. Nasal fin.

A lack of contact or fusion of the medial nasal and maxillary processes results in either a unilateral or bilateral cleft lip. The medial nasal process is called the philtrum. The epithelial coverings of the medial nasal and maxillary processes normally contact and create a zone of fusion termed the nasal fin. 

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