Orthodontic #8 – Unidontia

1. Skeletal deep bite causes:

Downward rotation of mandible

No rotation of mandible

Upward rotation of maxilla

Downward rotation of maxilla

2. Premature loss of a primary maxillary second molar usually produces a malocclusion in the permanent dentition that is characterized by

labially displaced maxillary canines.

an Angle Class II molar relationship on the affected side.

delayed eruption of the permanent first molar.

an Angle Class III molar relationship on the affected side.

3. Which of the following ortho wire has least modulus of elasticity

Cobalt chromium

Beta titanium

Niti

Stainless steel

4. In an Angle Class I occlusion, which cusp of which permanent tooth moves between the mesiolingual and distolingual cusps of the mandibular second molar in a working side movement?

Distolingual cusp of the maxillary second molar.

Distolingual cusp of the maxillary first molar.

Mesiolingual cusp of the maxillary second molar.

Mesiolingual cusp of the maxillary first molar.

5. Which is mixed dentition analysis:

Tanaka Johnsons analysis

Rickets analysis

Bolton’s analysis

Pont’s analysis

6. Adenoids lead to:

Vertical descent of maxilla

Vertical ascent of maxilla

Vertical ascent of mandible

Vertical descent of mandible

7. Once bone is formed, it grows by:

degenerative changes into bony structures

both appositional and interstitial growth

appositional growth only

interstitial growth only

8. When a simple tipping force is applied to the crown of a single-rooted tooth, the centre of rotation is located

at the apex.

at the cervical line.

within the apical half of the root.

within the cervical one third of the root.

9. Stationary anchorage in orthodontics means:

Abutment is not free to tilt

The abutment tooth is free to tilt

Use of opposite arch for anchorage

Equal and opposite movement in anchor unit

10. What is the most reliable indicator with respect to the timing of treatment for growth modification?

Dental age.

Tanner weight chart

Chronologic age.

Skeletal age.

11. Inability to produce bilabial sounds properly like /b/ and /p/ along with lisp like sounds is seen in which malocclusion:

Class II division 1 with incompetent lips

Class III with competent lips

Class I type 4

Class I type 3

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

Higher

Cannot be said

Same

Lower

13. Which of the following is correct:

Vertical jaw dysplasias are more genetically determined than other dysplasias

Genetics has equal influence on all types of jaw dysplasias

Anteroposterior jaw dysplasias are more genetically determined than other dysplasias

Transverse jaw dysplasias are more genetically determined than other dysplasias

14. Mesioangular ectopic eruption of a permanent mandibular first molar causing resorption of distal surfaces of the roots of the primary 2nd molar should be treated by:

Use of a brass wire to move the permanent molar distally

Removing the soft tissue overlying the occlusal surface of permanent molar

Disking of the distal surface of the primary second molar

Extracting the primary second molar

15. Maxillary arch increases in length by:

Deposition of bone at Tuberosity

Development of alveolar process

Growth at the sphenozygomatic suture

Development of Palate

16. Fishman’s index is used for:

Estimation of dental age

Studying skeletal maturity

Studying chronologic age

Estimation of body surface area

17. Baker’s anchorage is also known as

Intraoral anchorage

Extraoral anchorage

Intramaxillary anchorage

Intermaxillary anchorage

18. Appearance of ulnar sesamoid bones in hand occurs:

Birth

At onset of pubertal growth spurt

At the prepubertal spurt

At the end of pubertal spurt

19. Facial index of 85.6% means:

Mesoprosopic face

Euryprosopic face

Leptoprosopic face

Hypereuryprosopic face

20. 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

true unilateral crossbite.

occlusal interference and functional shift.

severe temporomandibular dysfunction.

two ideal occlusions.

Question 1 of 20