1. Cement used for cementation of orthodontics bracket is?

a) composite
b) Resins
c) GIC
d) none

2. Heavy forces on periodontal ligament causes

a) Hyalinization
b) Osteoclastic activity around tooth
c) Osteoblastic activity around tooth
d) Crest bone resorption

3. Resorption in case of ideal orthodontic tooth movement should be

a) Undermining
b) Frontal
c) Indirect
d) Necrotic

4. Resorption of cementum as compared to bone occurs

a) Less readily
b) More readily
c) Same
d) Undermining resorption

5. A 300 mg force is applied through a canine retractor, the following change will be noticed:

a) Hyalinization
b) Rapid tooth movement
c) Frontal root resorption
d) None of the above

6. If during an application of an orthodontic force, the level declines to zero between activations the force duration is called as

a) Continuous force
b) Interrupted force
c) Intermittent force
d) Differential force

7. It is normal response to orthodontic treatment for periodontal space to

a) Widen
b) Narrow
c) Shorten
d) Elongate

8. The histological section of tooth under orthodontic force representing an avascular area in the periodontal ligament is often referred as

a) Frontal zone
b) Hyalinised zone
c) Undermining zone
d) Clear zone

9. Most efficient orthodontic tooth movement is obtained by

a) Light continuous force
b) Large intermittent force
c) Light interrupted force
d) Heavy continuous force

10. Type of force in a patient activated appliance is?

a) Interrupted
b) Intermittent
c) Continuous interrupted
d) Continuous intermittent

Answers with explanation

1. A
Composite is used in cementation of orthodontics brackets, maryland bridges, ceramic crown, inlay, onlays and laminates venner

2. A

3. B

4. A

5. A

6. B

7. A

8. B

9. A

Orthodontic tooth movement is best produced by light continuous force.

10. B