Orthodontic #5 – Unidontia

1. Facial profile of a child with a habit of thumb sucking:

Concave and long face

Convex and short face

Concave and short face

Convex and long face

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

0-7 mm

5-7 mm

14-18 mm

10-14 mm

3. On Ricketts esthetic plane, the lower lip

Is I mm anterior to the plane

Is 1 mm posterior to the plane

Is 2 mm posterior to the plane

Rests on the plane

4. Ideal orthodontic tooth movement involves

undermining resorption.

frontal resorption.

large forces.

subcrestal incisions.

5. Which of the following conditions is most appropriately treated upon diagnosis?

Improper axial inclination.

A maxillary midline diastema.

End-to-end molar relationships.

Posterior cross-bite with midline discrepancies.

6. Branch of orthodontics concerned with management of teeth in mixed dentition period is called:

Surgical orthodontics

Preventive orthodontics

Corrective orthodontics

Interceptive orthodontics

7. If moment of couple moment of force MC/MF = 0, then what type of movement occurs:

Tipping

Bodily

Torque

Translation

8. In an 8-year old, the optimum time for treatment of an anterior crossbite of dental origin is

as soon as possible.

after the maxillary premolars erupt.

after the maxillary canines are in position.

following completion of jaw growth.

9. A Child with a Unilateral crossbite on closure is most probably suffering from:

Bilateral constriction of maxilla

Unilateral constriction of maxilla

Unilateral constriction of maxilla with deviated closure into unilateral crossbite

Bilateral constriction of maxilla with deviated closure into unilateral crossbite

10. In long face individuals, who have excessive lower anterior facial height, the palatal plane is rotated

Down posteriorly

Down anteriorly

No rotation of the palatal plane

Up posteriorly

11. Class II malocclusion usually presents a _________________ facial profile:

Orthognathic

Complex

Retrognathic

Prognathic

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

labially displaced maxillary canines.

delayed eruption of the permanent first molar.

an Angle Class III molar relationship on the affected side.

an Angle Class II molar relationship on the affected side.

13. Prior to the correction of a one tooth anterior crossbite, the principle factor to consider is the

sequence of eruption of the permanent dentition.

morphology of the anterior teeth.

adequacy of mesio-distal space.

developmental age of the patient.

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

Bolton’s analysis

Carey’s analysis

Hixon and Oldfather

Moyers analysis

15. Which of the following metals shows the property of twinning

All of the above

Nickel titanium alloy

Stainless steel

Cobalt chromium

16. The most appropriate treatment following the extraction of a first primary molar in a 4 year old child is

regular assessment of arch development.

extraction of the contra-lateral molar.

to perform space analysis.

insertion of a space maintainer.

17. A single tooth anterior crossbite found in a 9 year old should

be treated in the complete permanent dentition.

be treated with a removable appliance.

self-correct.

have 2 arch orthodontic treatment.

18. 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.

19. A 5 year and 4 months old child has a retrusive chin with reduced lower facial height, on intraoral examination, full cusp distal step molar relation is seen. The cephalometric parameters reveal a normal SNA but a reduced SNB. What should be the line of treatment

Bionator

Review at 6 years

Twin Block

Frankel II

20. The angle SNA can be used to evaluate the

maxillary protrusion.

overbite.

upper incisor inclination.

mandibular angle.

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