Orthodontics #2 – Unidontia

1. Which of the following is a latest advance in metallic brackets?

Use if metal injection moulding for bracket manufacturing

Plasma coated metal bracket bases

Duplex steel alloy brackets

All of the above

Question 1 of 20

2. Normal facial index is:

75-80%

>80%

<75%

Question 2 of 20

3. According to the NORMS of the orthodontic study models, the total height of maxillary n mandibular model should be close to?

90 mm

70 mm

60 mm

55 mm

Question 3 of 20

4. Angle's classification of occlusion is based on

antero-posterior skeletal relationship of maxilla to mandible.

vertical relationships in the lower face.

antero-posterior relationship of maxillary and mandibular first permanent molars.

a full complement of teeth.

Question 4 of 20

5. The ideal patient for rapid palatal expansion should have all characteristics except

Full cusp crossbite with a skeletal component

Some degree of dental as well as skeletal constriction initially

No preexisting dental expansion

Tendency of openbite

Question 5 of 20

6. Supracrestal fibrotomy is done following correction of:

Extrusion

Rotation

Translation

Tipping

Question 6 of 20

7. The first evidence of cartilage getting converted to bone in craniofacial skeleton occur during

Eighth Postnatal week

Fourth Prenatal week

Eighth Prenatal week

Fourth Postnatal week

Question 7 of 20

8. Maxillary arch increases in length by:

Development of Palate

Growth at the sphenozygomatic suture

Development of alveolar process

Deposition of bone at Tuberosity

Question 8 of 20

9. What is pitch of a Hyrax expansion screw

0.5 mm

1 mm

0.25 mm

1.5 mm

Question 9 of 20

10. In clinical dentistry, stiffness of wire is a function of

alloy composition.

All of the above.

length of the wire segment.

diameter of the wire segment.

Question 10 of 20

11. Teeth suffered from concussion, fracture of crown or root etc but not affecting pulp. Orthodontic force should be applied after

1month

15 days

2 months

3 months

Question 11 of 20

12. In orthodontics, how much activation is produced from a single turn of a palatal expansion screw?

0.25mm.

0.5mm.

1.0mm.

0.75mm.

Question 12 of 20

13. Anthropometry is

Measurement of skeletal dimensions on human skeletal remains

Measurement of skeletal dimensions on radiographs

Measurement of skeletal dimensions on Living individuals

Measurement of skeletal dimensions on photographs

Question 13 of 20

14. Extrusive movements ideally would produce no areas of compression within PDL, but will produce

Only retraction

Only tension

Only contusion

Only extraction

Question 14 of 20

15. Ugly duckling stage coincides with transitional phase

1st transitional phase

Inter transitional

2nd transitional

All of the above

Question 15 of 20

16. In the mixed dentition, an end-to-end first permanent molar relationship is indicative of

Angle Class III malocclusion.

ideal molar occlusion.

Angle Class II malocclusion.

normally developing occlusion.

Question 16 of 20

17. Titanium is added in stainless steel to

To form an oxide layer

Increase the resiliency

To increase the strength

All of the above

Question 17 of 20

18. In an adult Class II division 1 malocclusion case, what should be done:

Extraction of upper 1st PM

Extraction of upper 2nd PM

Extraction of lower 1st PM

Extraction of lower 2nd PM

Question 18 of 20

19. Couple in orthodontics means:

2 unequal forces acting on the same object opposite in direction

Single force acting on the same object

2 forces equal and opposite in direction acting on the same object

Single force acting on 2 objects at the same time

Question 19 of 20

20. Cleft lip and palate usually result from

failure of proper union of the median and lateral nasal processes.

failure of development of both the lateral nasal and maxillary processes.

anhidrotic ectodermal dysplasia.

failure of the union of the median nasal process with the lateral nasal and maxillary processes.

Question 20 of 20