Free Orthodontic Dental MCQ

REMOVABLE AND FIXED ORTHODONTIC APPLIANCES

1) When the diameter of a wire is doubled the force exerted on the teeth is:

a) 4 times.
b) ½ times.
c) 8 times.
d) 16 times.

2) Stationary anchorage is one in which:

a) The anchor teeth remain stationary.
b) The anchor teeth tip slightly.
c) The anchor teeth move bodily if at all.
d) The anchor teeth move less than the anterior teeth.

3) Torque in orthodontics indicates:

a) The change in mesiodistal inclination of teeth.
b) The change in labiolingual (axial) inclination of teeth.
c) The rotation of teeth.
d) All of the above.

4) Torque can be applied to teeth by means of:

a) Twin –wire.
b) Laminated wire.
c) Rectangular wire.
d) Nitinol wire.

5) For producing tooth movement, a removable appliance should be working at least:

a) 2-4 hours.
b) 4-6 hours.
c) 6-8 hours.
d) 8-10 hours.

6) Intermaxillary elastics can be used in fixed and removable appliance for treatment of:

a) Class I malocclusion.
b) Class II malocclusion.
c) Class III malocclusion.
d) Non of the above.

7) One of the disadvantages of removable appliance is:

a) Can be removed on socially sensitive occasion.
b) Reduce the chair time during the initial stage of treatment.
c) Allow some type of growth guidance.
d) Treatment is heavily dependant on patient compliance.

8) The most effective retention device for removable appliance is:

a) Adam clasp.
b) Finger spring.
c) Pin-lead clasp.
d) Ball clasp.

9) The labial bow in removable appliance was first designed by:

a) Charles tweed.
b) Charles Hawley.
c) Philip Adam.
d) George Crozet.

10) The Adam clasp of molar and premolar is made of:

a) 0.6 mm wire.
b) 0.7 mm wire.
c) 0.8 mm wire.
d) 0.5 mm wire.

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