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Questions and Answers
What is the approximate stage of root formation when permanent teeth pierce the gingival margin?
What is the approximate stage of root formation when permanent teeth pierce the gingival margin?
- Nearly ¾ (correct)
- Fully formed
- One half
- Two thirds
Where are the germs of permanent teeth formed in relation to their deciduous predecessors?
Where are the germs of permanent teeth formed in relation to their deciduous predecessors?
- On the mesial side
- On the buccal side
- On the lingual side (correct)
- On the distal side
What happens to a permanent incisor if the deciduous one fails to shed?
What happens to a permanent incisor if the deciduous one fails to shed?
- It erupts in a lingual position (correct)
- It erupts in a labial position
- It fails to erupt
- It erupts in a normal position
What happens to the rotation of permanent incisors in a potentially crowded mouth?
What happens to the rotation of permanent incisors in a potentially crowded mouth?
Why do permanent incisors rotate before eruption?
Why do permanent incisors rotate before eruption?
Where do premolars migrate to from their lingual position?
Where do premolars migrate to from their lingual position?
What is the direction of movement of the upper first molar during growth?
What is the direction of movement of the upper first molar during growth?
What occupies the former position of the upper first molar after eruption?
What occupies the former position of the upper first molar after eruption?
At what stage of root formation do permanent teeth pass through the crest of the alveolar process?
At what stage of root formation do permanent teeth pass through the crest of the alveolar process?
Why does the tooth tend to move to the line of the dental arch during development?
Why does the tooth tend to move to the line of the dental arch during development?
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