MJDF Orthodontics 2

Question 1

Which type of orthodontic tooth movement involves the entire tooth, including the root apex, moving in the same direction without tipping?

Accepted Answer

Bodily (translation) movement

Answer

Tipping

Answer

Torque

Answer

Rotation

Question 2

Current best evidence regarding the duration of orthodontic retention after fixed appliance therapy recommends:

Accepted Answer

Indefinite retention

Answer

3 months of night-time wear

Answer

6 months of full-time wear

Answer

12 months then cessation

Question 3

Which force type is considered optimal for efficient orthodontic tooth movement with minimal tissue damage?

Accepted Answer

Light continuous force

Answer

Heavy continuous force

Answer

Light intermittent force

Answer

Heavy intermittent force

Question 4

The Hawley retainer is best classified as which type of orthodontic appliance?

Accepted Answer

Removable retainer

Answer

Fixed functional appliance

Answer

Fixed lingual retainer

Answer

Myofunctional regulator

Question 5

Extraoral anchorage in orthodontics refers to:

Accepted Answer

Using structures outside the oral cavity such as the head or neck to reinforce anchorage

Answer

Using teeth in both arches to resist forces

Answer

Using soft tissue anchorage from the tongue

Answer

Implant-supported anchorage within the jaw bone

Question 6

A hyperdivergent skeletal facial pattern is characterised by:

Accepted Answer

Increased lower facial height and a steep mandibular plane angle

Answer

Reduced lower facial height and a flat mandibular plane angle

Answer

Prominent cheekbones with deep overbite

Answer

Retrognathic maxilla with normal mandibular plane angle

Question 7

The primary mechanism by which functional appliances achieve their effect is:

Accepted Answer

Redirecting condylar growth by posturing the mandible forward

Answer

Direct mechanical forces applied to individual teeth

Answer

Applying torquing forces to root apices

Answer

Suture expansion of the midpalatal suture