Orthodontic #7 – Unidontia

1. Moyers D type CLASS II malocclusion is

Prognathic Maxilla / Retrognathic Mandible

Retrognathic Maxilla / Retrognathic Mandible

Orthognathic Maxilla / Orthognathic Mandible

Orthognathic Maxilla / Retrognathic Mandible

2. Appearance of ulnar sesamoid bones in hand occurs:

At onset of pubertal growth spurt

At the end of pubertal spurt

At the prepubertal spurt

Birth

3. With flush-terminal plane, permanent first molars will erupt:

Initially end-to-end relationship

Initially in class III relationship

Initially in class I relationship

Initially in class II relationship

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

6 mm maxilla, 4 mm mandible

5 mm maxilla, 7 mm mandible

4 mm maxilla, 6 mm mandible

7 mm maxilla, 5 mm mandible

5. One of the greatest advantages of using extra-oral anchorage is that:

It can be used for all types of malocclusion.

It has a direct reciprocal action on the opposing arch.

It permits the posterior movement of teeth in one arch without adversely disturbing the opposite arch.

More force can be applied.

6. A 7 year old child has a badly carious deciduous mandibular first molar that needs removal. What space maintainer will you advise?

Nance button

Transpalatal arch

Band and loop

Distal shoe

7. A steep mandibular plane angle correlates with a:

Short anterior facial height and anterior deep bite malocclusion

Long anterior facial height and anterior deep bite malocclusion

Short anterior facial height dimensions and anterior open bite malocclusion

Long anterior facial height dimensions and anterior open bite malocclusion

8. Best method to retain a corrected maxillary canine rotation:

Overcorrection

Long term removable retainer

Permanent retention

Supracrestal fibrotomy

9. 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

two ideal occlusions.

occlusal interference and functional shift.

severe temporomandibular dysfunction.

true unilateral crossbite.

10. Which condition is appropriately treated at an early age?

mild crowding of lower permanent incisors

deviated midline in the absence of a functional shift

two deciduous molars nearly in crossbite

posterior crossbite with a functional shift

11. According to Simon classification, movement of teeth towards Frankfort plane is called:

Abstraction

Attraction

Retraction

Protraction

12. Bien theory is related to:

Bone regeneration

Tooth movement

Osteitis

Osteomyelitis

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

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

Class II Division 1 associated with an anterior open bite.

Class II Division 2 associated with an increased anterior overbite.

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

14. Skeletal deep bite causes:

Upward rotation of maxilla

Downward rotation of maxilla

Downward rotation of mandible

No rotation of mandible

15. Couple in orthodontics means:

Single force acting on the same object

Single force acting on 2 objects at the same time

2 unequal forces acting on the same object opposite in direction

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

16. In a tooth with alveolar bone resorption what will be the change in center of resistance?

No change

It will shift apically

It will shift coronally

It will move outside the tooth

17. Seventh key of normal occlusion:

Palatal plane

Molar relation

Bolton ratio

Crown angulation and inclination

18. Phsio-Print’ is a term given to

A test to assess mental growth and correlate to the dental growth

A photographic orientation technithat permits measurement of facial contours and volume

Facial mask of patient taken before and after treatment

Physiologic assessment of growth changes

19. Which of these is most promising soft tissue investigation:

Barium Meal

Stereophotogrammetry

Poor man cephalometry

Tc scan

20. At age 9, a pt needs his tooth #30 extracted due to caries. What is the proper space maintenance treatment?

band and loop on “T”

no space maintenance is needed

removable partial denture

distal shoe on “T”

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