Question 35 · LDEK · Trauma to permanent teeth
In the case of the intrusion of a permanent tooth:
1) if the crown is visible and the root apex is wide open (>2mm) , the tooth can be left for self-re-eruption;
2) immediate reposition is indicated in permanent teeth with completed root development;
3) in intruded immature permanent teeth, left for re-eruption, ankyloses occurs very rarely;
4) the reposition does not decrease the necrosis of periodontal ligaments;
5) in almost all such cases the extirpation of pulp is needed.
The correct answer is:
2) immediate reposition is indicated in permanent teeth with completed root development;
3) in intruded immature permanent teeth, left for re-eruption, ankyloses occurs very rarely;
4) the reposition does not decrease the necrosis of periodontal ligaments;
5) in almost all such cases the extirpation of pulp is needed.
The correct answer is:
- A. 3,4,5.
- B. 1,2,3.
- C. 1,2,5.
- D. 2,3,4.
- E. 1,3,4.
Hint
Distinguish immature from mature teeth: which can re-erupt spontaneously and keep a vital pulp, and what repositioning cannot undo.
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