Removable Orthodontic Appliance MCQs

1. Adams cribs can fracture in use if the:

A. Wire is too soft
B. Tags are high on the bite
C. Base plate is too thick
D. Arrowheads are too small

2. How/where should wire be bent to activate a correctly made palatal canine retractor?

A. Between the coil and tooth, but close to the coil
B. Between the coil and tooth, but close to the tooth
C. Between the coil and its insertion into the base of the palate
D. By opening out the coil

3. An anterior bite plane is used in correction of:

A. Anterior cross bite
B. Deep bite
C. Open bite
D. All of the above

4. Posterior bite plane is used in correcting:

A. Deep bite
B. Anterior open bite
C. Anterior cross bite
D. Posterior cross bite

5. Example of a semifixed orthodontic appliance is:

A. Kesslings wrap around retainer
B. Hawley's retainer
C. Lip bumper
D. Pin and tube appliance

6. The diameter of labial bow of the maxillary plate is:

A. 0.5 - 0.6 mm
B. 0.6 - 0.8 mm
C. 0.7 - 0.8 mm
D. 0.8 - 1.0 mm

7. A buccal canine retractor is better than a palatal canine retractor when:

A. The maxillary canine is distally placed
B. The maxillary canine is partially impacted
C. The maxillary canine is distally placed and rotated
D. The maxillary canine is buccally placed