Question 128 · LDEK · Craniofacial and occlusal development
Which of the following describing postnatal masticatory system development is true?
1) child is born with physiological retrogenia;
2) breast feeding is the most important factor influencing the mandibular forward growth;
3) after the eruption of upper and lower incisors the overbite is deep;
4) the curve of Spee is lacking in full milk dentition;
5) in a 3-year-old child the upper arch is shaped like an ellipse and the lower arch like a parable;
6) in milk dentition development without spacing according to Baum, the mesial drift of the first lower molars occurs with falling out of the second milk teeth.
The correct answer is:
2) breast feeding is the most important factor influencing the mandibular forward growth;
3) after the eruption of upper and lower incisors the overbite is deep;
4) the curve of Spee is lacking in full milk dentition;
5) in a 3-year-old child the upper arch is shaped like an ellipse and the lower arch like a parable;
6) in milk dentition development without spacing according to Baum, the mesial drift of the first lower molars occurs with falling out of the second milk teeth.
The correct answer is:
- A. 1,2,3,4.
- B. 1,3,4,5.
- C. 1,2,4,5,6.
- D. 3,4,6.
- E. 1,3,4,6.
Hint
Recall the newborn's jaw relationship, the initial incisor overlap, the flat primary occlusal plane and the late mesial shift in non-spaced arches.
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