Liz Maas
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Liz Maas
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CF 22-23 Odontogenesis

Question 1 of 13

1

Which is the correct order?

Select one of the following:

  • Bud, cap, placode, bell, root

  • bud, bell, cap, root, placode

  • placode, bud, cap, bell, root

  • placode, cap, bud, bell, root

  • bud, placode, cap, bell, root

Explanation

Question 2 of 13

1

Which of the following is correct about the primary epithelial band

Select one of the following:

  • Thickening of the oral epithelium seen at 7th week

  • Tooth formation is limited mesiodistally

  • Becomes dental lamina upon invasion of the ectomesenchyme

  • becomes lamina and thickens at 7th week

  • all of the things

Explanation

Question 3 of 13

1

Which of the following is incorrect?

Select one of the following:

  • The primary epithelial band forms both the dental and vestibular lamina

  • The dental lamina comes from the dental placode

  • There are 16 dental placodes per arch

  • Thickening at the primary epithelial band indicates formation of future teeth

  • SHH and PITX2 are expressed in the primary epithelial band

Explanation

Question 4 of 13

1

During the cap stage, which of the following occurs?

Select one of the following:

  • Positively charged proteoglycans are formed to attract water

  • Lots of mitosis for formation of cervical loop

  • Epithelial cells form outer enamel

  • proteoglycans and mitosis

  • proteoglycans and enamel

Explanation

Question 5 of 13

1

Which of the following is incorrectly matched?

Select one of the following:

  • enamel organ... cell rest of Malassez

  • dental papilla... pulp tissue

  • dental follicle... periodontal ligament

  • dental papilla... junctional epithelium

  • dental follicle... alveolar bone

Explanation

Question 6 of 13

1

Which of the following is incorrect?

Select one of the following:

  • Enamel pearls can form during the late bell stage

  • Enamel knots do not divide and are organizing centers for cusp formation

  • The major protein of dentin is type 3 collagen

  • All of the above

  • Type 3 collagen and enamel knots

Explanation

Question 7 of 13

1

All succedaneous teeth form from lingual extensions of the dental lamina. Molars also develop from lingual extensions of the dental lamina

Select one of the following:

  • Both true

  • True, False

  • False, True

  • Both false

Explanation

Question 8 of 13

1

Which of the following is false?

Select one of the following:

  • Some of the cervical loop cells form cell rests of Malassez

  • The periodontal ligament is a special ligament made from epithelial cells

  • Some Hertwig's epithelial root sheath cells become epithelial cell rests of Malassez

  • None of the above

  • Epithelial-mesenchymal interactions induce dentinogenesis, root morphogenesis, and cementum formation

Explanation

Question 9 of 13

1

Mo SHH, mo cusps? Insulin-like growth factor is associated with Hertwig's epithelial root sheath?

Select one of the following:

  • Both true

  • True, false

  • False, true

  • Both false

Explanation

Question 10 of 13

1

FGF4 is involved in Hertwig's epithelial root sheath formation. FGF10 is involved in cusp formation

Select one of the following:

  • Both true

  • True, false

  • False, true

  • Both false

Explanation

Question 11 of 13

1

According to the Homeobox Code Theory, BMP4 and FGF 8/9 ratios determine tooth type. Anterior-posterior axis set by PMP4 posteriorly and FGF 8/9 anteriorly.

Select one of the following:

  • Both true

  • True, false

  • False, true

  • Both false

Explanation

Question 12 of 13

1

In homeobox theory, signaling molecules determine tooth type and axis within primary epithelial band. Clone theory states that clones give inhibitory signals to stop formation of additional teeth

Select one of the following:

  • Both true

  • True, false

  • False, true

  • Both false

Explanation

Question 13 of 13

1

Which of the following is incorrectly matched?

Select one of the following:

  • Dental follicle...osteoblasts

  • Dental papilla... odontoblasts

  • Enamel organ... cementoblasts

  • Dental follicle... fibroblasts

Explanation

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