Orthodontics #10 – Unidontia

1. Most common dental problem associated with cleft lip and palate is:

Anterior open bite

Anterior deep bite

Rotation of central incisor

Unilateral or bilateral posterior cross bite

Question 1 of 20

2. Dontrix gauze is used to:

Measure wire distortion

Measure force

Measure wire deformation

Measure strength of wire

Question 2 of 20

3. Which of the following are potentially detrimental conditions that can occur during use of orthodontic appliances?

Cause irritation to the gingiva

Act as plaque harbors

Make proper oral hygiene difficult to perform

All of the above

Question 3 of 20

4. Baker's anchorage is also known as

Intramaxillary anchorage

Extraoral anchorage

Intermaxillary anchorage

Intraoral anchorage

Question 4 of 20

5. What should be used initially for removing adhesive after debonding

High speed diamond

Sharp edge of debonding instrument

12 flute TC bur

Round green bur

Question 5 of 20

6. The best space maintainer to prevent the lingual collapse that often occurs following the early loss of a mandibular primary canine is a

distal shoe space maintainer.

Nance expansion arch.

band and loop space maintainer.

lingual arch.

Question 6 of 20

7. Vertical height of face is measured by:

Boos gauge

Will's gauge

All of the above

Boyle gauge

Question 7 of 20

8. Foetus develops infantile swallow and suckling by:

28th week of IU life

After birth

At birth

32 weeks IU life

Question 8 of 20

9. Teeth with root fracture cannot be moved orthodontically for:

1 month

6 months

1 year

3 months

Question 9 of 20

10. Serial extraction procedures involve:

Orderly removal of selected primary and permanent teeth in a predetermined sequence

Orderly sequential removal of selected primary teeth only

Orderly removal of selected primary and permanent teeth in a single sitting

Orderly and sequential removal of selected permanent teeth only

Question 10 of 20

11. The two main conditions complicating the correction of a single tooth anterior crossbite are

lack of spacing and decreased overbite.

a decreased overbite and a large labial frenum.

an increased overbite and a large labial frenum

lack of spacing and increased overbite.

Question 11 of 20

12. A contraindication for serial extraction is

Class I skeletal pattern

Deep bite

Severe crowding

Mixed dentition stage of dental development

Question 12 of 20

13. The malocclusion which is most prevalent in India

Class I type 1

Class II / 1

Class III

Class II /2

Question 13 of 20

14. Secondary or Intermediate alveolar bone grafting for a cleft palate patient is done:

Before canine eruption

Before maxillary lateral incisor eruption

After first molar eruption

After canine eruption

Question 14 of 20

15. Components of IOTN include:

Dental and esthetics

Soft tissue and hard tissue

Esthetic and hard tissue

Dental and soft tissue

Question 15 of 20

16. Stationary anchorage in orthodontics means:

The abutment tooth is free to tilt

Abutment is not free to tilt

Use of opposite arch for anchorage

Equal and opposite movement in anchor unit

Question 16 of 20

17. The facial angle is high in:

Posterior divergent face

Anterior divergent face

None of the above

Orthognathic face

Question 17 of 20

18. Which of the following alloys are used for archwires in orthodontics?

Stainless steel

Titanium

All of the above

Chromium-cobalt

Question 18 of 20

19. Which of the following bone is used for estimation of growth in an individual:

Capitate

Clavicle

Cervical vertebra

Frontal bone

Question 19 of 20

20. Not true about couple of forces acting on a tooth:

Usually forces are equal in magnitude

Collinear forces acting in same direction

Forces are oriented parallel to each other

Pure rotation can be achieved

Question 20 of 20