Question 47 · LDEK · Fixed appliances
Superelastic nickel titanium wires should not be used:
1) as the initial wires at significant crowding;
2) as the initial wires at small or medium crowding;
3) when closing extraction spaces with laceback ligatures - the teeth may be tilted towards postextraction spaces;
4) when using open springs for getting space for impacted teeth;
5) during levelling and aligning phase in the initial stages of the treatment.
The correct answer is:
2) as the initial wires at small or medium crowding;
3) when closing extraction spaces with laceback ligatures - the teeth may be tilted towards postextraction spaces;
4) when using open springs for getting space for impacted teeth;
5) during levelling and aligning phase in the initial stages of the treatment.
The correct answer is:
- A. 1,2,3,5.
- B. 1,2,5.
- C. 3,4.
- D. 2,5.
- E. all the above.
Hint
NiTi gives light, continuous force but is very flexible; in which situations would a flexible wire fail to control tooth position?
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