NEET MDS Quiz - Practice Test

1

Orthodontics

Contraindications of activator are all except
1) High FMA angle
2) Severe protruded maxilla
3) Growing patient
4) Severe crowding

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

Contraindications for activator include high FMA angle, severe protruded maxilla, and severe crowding. It is indicated for growing patients.

2

Orthodontics

If the edgewise bracket is not pressed completely on to a tooth on the mesial side while bonding, the side effect would be
1. intrusion
2. extrusion
3. rotation
4. breakage of bracket

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

we are applying force distally only..force vector will rotate the tooth distally

3

Orthodontics

A single force applied at which point of a tooth will allow complete translation of the tooth.

1) At the apex
2) At the incisal edge
3) At the center of resistance
4) At the center of rotation

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

SOLUTION

Center of resistance- Point analogous to the centers of gravity.
Generally it is constant.In single root it lies between one third and one half of the root apical to alveolar crest.
In multi rooted tooth it lies 1-2 mm apical to furcation

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