Question 374 · LDEK · Tooth development and mineralization
Indicate true statements regarding odontogenesis:
1) after the formation of all deciduous teeth germs, the dental laminae continue their anterior growth, initiating the formation of germs of the incisors, canines and premolars;
2) first molar germs appear in the 16th-17th week of embryonic life, and permanent second molar germs appear in the 3rd month of life;
3) histological differentiation begins at the cap stage;
4) at the late cap stage (12th-13th week), the inner epithelial cells transform into enamel- forming cells - ameloblasts;
5) at the bell stage, the mesenchymal cells of the primary dental papilla form odontoblasts;
6) cementum and periodontal ligament develop from the dental sac that surrounds the entire tooth germ.
The correct answer is:
2) first molar germs appear in the 16th-17th week of embryonic life, and permanent second molar germs appear in the 3rd month of life;
3) histological differentiation begins at the cap stage;
4) at the late cap stage (12th-13th week), the inner epithelial cells transform into enamel- forming cells - ameloblasts;
5) at the bell stage, the mesenchymal cells of the primary dental papilla form odontoblasts;
6) cementum and periodontal ligament develop from the dental sac that surrounds the entire tooth germ.
The correct answer is:
- A. 1,2,4.
- B. 3,4,6.
- C. 2,5,6.
- D. 3,5,6.
- E. 1,4,5.
Hint
Check at which stage ameloblasts versus odontoblasts differentiate and which lamina gives rise to the successional germs.
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