Orthodontics- NEETMDS.com prep mcq

1 Orthodontics

Flaccid lip, digit sucking, high frenum attachment & poor muscle tone are the etiology of :

1) Anterior cross bite
2) Diastema
3) Anterior bite
4) Posterior cross bite

Option 1

Option 2

Midline diastema Etiology

Normal developing dentition - (Ugly Ducking Stage)

Parafunctional habits
- Flaccid lips along with poor muscle tone
- Simple Tongue thrust can cause anterior open bite as well as diastema
- Thumb sucking or digit sucking for a prolonged time period

Retrognathic mandible/ Prognathic mandible

Frenum attachments
Mesio-distal angulation of teeth
Tooth anomalies (eg. supernumerary teeth, peg laterals, absence of laterals)

Pathological (Juvenile periodontitis)

Option 3

Option 4

2 Orthodontics

Considering the 3D growth of the face, it ceases last in which direction?
1. A-P
2. sagittal
3. transverse
4. vertical

Option 1

Option 2

Option 3

Option 4

for facial growth order of growth is width > depth > height

3 Orthodontics

The first ossification center of the mandible in six weeks old human embryo is found in which of the following locations

1) Future coronoid process
2) Future condylar process
3) Future mental foramen
4) Future mandibular foramen

Option 1

Option 2

Option 3

SOLUTION

The mandible is ossified in the fibrous membrane covering the outer surfaces of Meckel’s cartilages.

These cartilages form the cartilaginous bar of the mandibular arch, and are two in number, a right and a left.

Ossification takes place in the membrane covering the outer surface of the ventral end of Meckel’s cartilage , and each half of the bone is formed from a single center which appears, near the mental foramen, about the sixth week of fetal life.

By the tenth week the portion of Meckel’s cartilage which lies below and behind the incisor teeth is surrounded and invaded by the membrane bone

Option 4

4 Orthodontics

Which of the following shows 200 % of its adult growth by age 9-10 years
1) Lymphoid
2) General
3) Genital
4) Neural

Option 1

The lymphoid system, which includes lymph nodes, spleen, and other lymphatic tissues, undergoes significant growth during childhood. By the age of 9-10 years, the lymphoid tissue can reach approximately 200% of its adult size due to the increased demand for immune function during this period. This growth is part of the body's preparation for increased exposure to pathogens as children interact more with their environment.

Option 2

Option 3

Option 4

5 Orthodontics

If the tooth has not erupted to the line of occlusion it is called

1) Supraversion

2) Torsiversion

3) Rotated

4) Infraversion

Option 1

Option 2

Option 3

Option 4

Terms used to describe the position of teeth.

Mesioversion - A tooth in the arch located more mesial than normal
Distoversion - A tooth in the arch located more distal than normal
Labioversion - An incisor or canine outside of arch towards the lips
Buccoversion - A posterior tooth outside the arch toward the cheek
Linguoversion - A tooth inside the arch form toward the tongue
Infraversion - A tooth that has not erupted to the occlusal plane
Supraversion - A tooth the has over-erupted
Torsiversion - A tooth rotated on its axis
Transversion (Transposition) - Teeth that are in the wrong sequential order.

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If the tooth has not erupted to the line of occlusion it is called

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