Question 129 · LDEK · Etiology of malocclusion
The dorsal position of child's head during sleep may lead to:
- A. anterior displacement of the mandible and the tongue.
- B. hypercontraction/activity of muscles responsible for moving the mandible forward which has an impact on the temporomandibular joint.
- C. posterior displacement of the mandible and the tongue.
- D. decrease in the range of the mandibular resting position, which causes the lips to part and an open bite to form.
- E. C and D are true.
Hint
Consider what gravity does to the mandible and tongue when an infant sleeps on its back with the head tilted back.
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