Orthodontics #7 – Unidontia

1. For bite opening in orthodontics, which of the following is done:

Mesialization of posterior teeth

Extrusion of anterior and intrusion of posterior teeth

Retraction of anterior teeth

Intrusion of anterior and extrusion of posterior teeth

Question 1 of 20

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

Stainless steel

All of the above

Titanium

Chromium-cobalt

Question 2 of 20

3. The most appropriate time for surgical treatment of a patient with mandibular prognathism is

just after the end of the prepubertal growth spurt.

just before eruption of the second permanent molars.

following the completion of growth.

just after eruption of the second permanent molars.

Question 3 of 20

4. Bone remodeling theory of craniofacial growth was given by

Brash

Van der claw

John hunter

Melvin and Sicher

Question 4 of 20

5. Which of the following are not classic symptoms of a sucking habit?

anterior open bite

expanded maxillary arch

a Class II malocclusion

retroclination of the mandibular incisors

Question 5 of 20

6. Which of the following is the normal relationship of the primary molars in the deciduous dentition?

None of the above

Distal step

Flush-terminal-plane

Mesial step

Question 6 of 20

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

an increased overbite and a large labial frenum

lack of spacing and decreased overbite.

lack of spacing and increased overbite.

a decreased overbite and a large labial frenum.

Question 7 of 20

8. To produce pure translatory motion in a tooth, what type of force is required

Intermittent force

Interrupted force

Continuous force

Moment of force

Question 8 of 20

9. Which of the following is used for etching porcelain?

9.6% HF acid

1.23% HF acid

37% HF acid

4% HF acid

Question 9 of 20

10. During intrusion, the center of rotation lies:

At infinity

At CEJ

Outside the tooth

Inside the tooth at 1/3rd distance from apex

Question 10 of 20

11. Superimposition in cephalometric studies is done from Registration point. This demonstrates best:

All of the above

Growth of structures farthest from that point

Growth of structures at that point

Growth of structures nearest from that point

Question 11 of 20

12. Delaire type of face mask is used:

To retract maxilla

To hold maxillary dentition

To protract maxilla

To protrude mandible

Question 12 of 20

13. Which of the following Class II Division 1 malocclusion(s) is/are most likely to be corrected with a cervical headgear?

Open bite, prognathic maxilla, prognathic mandible.

Prognathic maxilla, decreased lower face height, increased over bite.

Increased lower anterior face height, prognathic mandible, retrognathic maxilla.

Retrognathic mandible, retrognathic maxilla, open bite.

Question 13 of 20

14. Anthropometry is

Measurement of skeletal dimensions on Living individuals

Measurement of skeletal dimensions on human skeletal remains

Measurement of skeletal dimensions on photographs

Measurement of skeletal dimensions on radiographs

Question 14 of 20

15. Mode of inheritance of cleft lip n palate is

Multifactorial trait

Single gene determined

Monogenic

Polygenic trait

Question 15 of 20

16. The ratio of skeletal: Dental expansion obtained finally after Rapid palatal expansion is

1;1

2;1

3;1

4;1

Question 16 of 20

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

Facial angle

ANB

Facial axis

N-Pog perpendicular

Question 17 of 20

18. How much overjet can be successfully managed using dentofacial orthopedics:

5-7 mm

14-18 mm

0-7 mm

10-14 mm

Question 18 of 20

19. Concept of lingual orthodontic appliance was introduced by

Mershon

Johnson

Kurz

Atkinson

Question 19 of 20

20. In which population, incidence of cleft lip and palate has highest incidence:

Negroes

Chinese

Afghans

Japanese

Question 20 of 20