Orthodontic #1 – Unidontia

1. 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 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

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

2. The most common cause of an anterior cross bite in mixed dentition is:

Thumb sucking

Premature exfoliation of primary tooth

Prolonged retention of deciduous teeth

Jaw discrepancy

3. The most appropriate opportunity for orthodontic treatment involving growth manipulation is

during the period of greatest growth velocity.

during the late primary dentition.

after the eruption of third molars.

after skeletal growth is complete.

4. The cranial vault is made up of a number of flat bones that are formed by _________________ , ________ cartilaginous precursors.

Both endochondral and intramembranous bone formation; with

Intramembranous bone formation; without

Endochondral bone formation; with

Both endochondral and intramembranous bone formation; without

5. A patient, when in full intercuspation, shows a right side posterior crossbite and a lower midline that is deviated to the right. At initial contact there are bilateral posterior crossbites and coincident midlines. The most likely cause of this finding is

occlusal interference and functional shift.

true unilateral crossbite.

severe temporomandibular dysfunction.

two ideal occlusions.

6. Foetus develops infantile swallow and suckling by:

At birth

32 weeks IU life

After birth

28th week of IU life

7. COGS analysis was given by:

Burstone and Legan

Burstone and Levine

Burstone and Nanda

Burstone and Merill

8. Which orthodontic analysis uses the dimensions of the upper and lower anterior teeth to predict the dimensions of the posterior teeth:

Bolton’s analysis

Hixon and Oldfather

Carey’s analysis

Moyers analysis

9. Frontal cephalogram is used to evaluate which type of malrelation:

Sn-GoGn angle

Facial asymmetry

Overjet

Overbite

10. In a mouth breather, tonicity of upper lip is

No change

Increased

Decreased

Slightly affected

11. All of the following are types of tooth movement EXCEPT one. Which one is the EXCEPTION?

translation

Tipping

pulling

extrusion

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

10-14 mm

14-18 mm

5-7 mm

0-7 mm

13. Appropriate forces for orthodontic tooth movement are

continuous and light.

continuous and heavy.

intermittent and light.

intermittent and heavy.

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

Capitate

Frontal bone

Cervical vertebra

Clavicle

15. Incisal liability in the maxillary and mandibular arch is:

4 mm maxilla, 6 mm mandible

5 mm maxilla, 7 mm mandible

7 mm maxilla, 5 mm mandible

6 mm maxilla, 4 mm mandible

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

ideal molar occlusion.

Angle Class II malocclusion.

normally developing occlusion.

Angle Class III malocclusion.

17. Eruption path of posterior maxillary permanent teeth is directed:

Downward and buccal

Downward and distal

Downward and labial

Downward and mesial

18. Safety valve mechanism for pubertal growth spurt is:

Intercanine width in mandible in both males and females

Intercanine width in maxilla in females only

Intercanine width in maxilla in both males and females

Intercanine width in maxilla in males only

19. Which of the following soft tissues of the oro facial region mature first:

Lips

Posterior 1/3rd of tongue

Tip of tongue

All soft tissues mature simultaneously

20. Which type of malocclusion should be corrected as early as possible?

Class II Division 2 associated with an increased anterior overbite.

Cross-bite associated with a functional shift of the mandible from initial contact to maximum intercuspation.

Anterior open bite associated with a lip or digit sucking habit.

Class II Division 1 associated with an anterior open bite.

Question 1 of 20