DEFINITIVE ORTHODONTIC TREATMENT

 

1) Orthodontic treatment depends on great extent upon the adoption capacity of:
a) Tooth.
b) Alveolar process.
c) Periodontal ligament.
d) All the above.

2) Which of the following should be treated early in complete primary dentition?
a) Posterior cross bite caused by mandibular shift.
b) Mild to moderate crowding of the lower anterior primary teeth.
c) Midline diastema.
d) Anterior open bite due to thumb sucking.
3) Which of the following wire is useful in the initial stage(alignment) of treatment:
a) NiTi wire.
b) Stainless steel.
c) TMA wire.
d) Rectangular wire.

4) Surgery of the hard palate of a 3 year-old cleft palate patient may inhibit growth centers causing the facial profile to become:
a) Elongated.
b) Shortened.
c) More convex.
d) More concave.

5) Anterior teeth most likely to be fractured with which of the following mixed dentition malocclusion:
a) Class I.
b) Class II div.1.
c) Class II div.2.
d) ClassIII.

6) The debonding of the bracket should be done by:
a) Applying shearing stress on the bracket, twisting it away from tooth surface.
b) Applying a cutting plier to the base of the bracket so that the bracket bends.
c) By cutting the bracket and then removing it.
d) Both a and b.

7) The best desirable method to obtain an attachment to impacted canine is:
a) Place a ligature wire around a crown of the canine.
b) Place a pin in the hole prepared into crown impacted teeth.
c) Directly bond an attachment of some type (button\ hook) to enamel surface.
d) Non of the above.

8) For retraction of incisor and canine , the loop design preferred is:
a) Open helical loop.
b) Close helical loop.
c) Bull loop.
d) Delta\ T Shape loop.

9) In the 1st premolar extraction situation, the closing loop should be placed:
a) Approximately 5mm distal to the center of the canine.
b) Mid way between the canine and the 2nd premolar.
c) More toward the canine between the canine and the 2nd premolar.
d) More toward the 2nd premolar between the canine and 2nd premolar.

10) The preferred method for sliding the canine retraction in 0.022 edgewise appliance is:
a) With a coil spring (plecher spring).
b) A spring (hice spring) soldered to the base arch wire.
c) An elastomeric chain from the molar to cvainin.
d) Both a and b.
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