Orthodontic #4 – Unidontia

1. Skeletal deep bite causes:

Downward rotation of maxilla

Downward rotation of mandible

No rotation of mandible

Upward rotation of maxilla

2. All of the following assumptions are considered true when doing space analysis for calculating space discrepancy except:

Prediction tables are most valid for all populations

Correlation in size of mandibular incisors and succedaneous teeth

All permanent teeth will develop normally

Arch dimensions remain stable

3. A Child with a Unilateral crossbite on closure is most probably suffering from:

Unilateral constriction of maxilla with deviated closure into unilateral crossbite

Bilateral constriction of maxilla

Bilateral constriction of maxilla with deviated closure into unilateral crossbite

Unilateral constriction of maxilla

4. Hand wrist radiograph in orthodontics are used to accurately determine:

Both A and B

Skeletal maturity

Chronological age

Dental age

5. If moment of couple moment of force MC/MF = 0, then what type of movement occurs:

Translation

Tipping

Torque

Bodily

6. A Moment: Force ratio of 7 will cause:

Uncontrolled tipping

Torqueing

Translation

Controlled tipping

7. Maxillary arch increases in length by:

Deposition of bone at Tuberosity

Development of Palate

Growth at the sphenozygomatic suture

Development of alveolar process

8. There is a difference between girls and boys with respect to the age at which the growth velocity reaches its peak.

Girls are two years ahead of boys

Boys are six months ahead of girls.

Girls are one year ahead of boys.

Girls are six months ahead of boys.

9. A 5 year and 4 months old child has a retrusive chin with reduced lower facial height, on intraoral examination, full cusp distal step molar relation is seen. The cephalometric parameters reveal a normal SNA but a reduced SNB. What should be the line of treatment

Review at 6 years

Twin Block

Bionator

Frankel II

10. In mandibular rotation what is the contribution of total matrix and intra matrix rotation:

50% intramatrix; 50% matrix

0% intramatrix; 100% matrix

100% intramatrix; 0% matrix

25% matrix; 75% intramatrix

11. Maxillary skeletal arch expansion

increases overbite.

requires surgery in skeletally immature patients.

decreases arch space.

is easiest in the preadolescent patient.

12. Serial extraction procedures involve:

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

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

Orderly and sequential removal of selected permanent teeth only

Orderly sequential removal of selected primary teeth only

13. Retrusion and protrusion of the mandible cannot be measured by which radiographic cephalometric variable?

ANB

Facial angle

N-Pog perpendicular

Facial axis

14. To standardize the magnification during recording of a lateral cephalogram for a child, the position of the sensor/film should be

Consider head radius as 6 inches and add to 60 inches between ilm and source of radiation

Consider head radius as 9 inches and add to 60 inches between film and source of radiation

Distance between the sensor and source of radiation should be kept at 70 inches

Distance between sensor and source should be 60 inches

15. The importance of proximal caries in deciduous 1st Molar for an orthodontist is:

RedUcticin in, arch length due to growth of mandible

Loss of arch length

Flush terminal plane malocclusion

Class I Occlusion

16. Which of the following soft tissue response may occur as a response to orthodontic bands:

Marginal gingivitis

Ulcerative gingivitis

Gingival fibrosis

Fulminating periodontitis

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

Capitate

Frontal bone

Cervical vertebra

Clavicle

18. Compared to homogenous populations, malocclusion in a heterogenous population is:

Cannot be said

Lower

Higher

Same

19. Tooth most likely to be displaced in case of mandibular arch crowding is:

1st premolar

1st molar

2nd premolar

2nd molar

20. Cobalt-Chromium alloy (elgiloy) is not available in which of the following tempers

Red

Blue

Green

Black

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