Orthodontic #3 – Unidontia

1. Dolicocephalic face shows which of the following?

Narrow and wide arches

Short and wide arches

Narrow and long arches

Short and narrow arches

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

Growth of structures at that point

Growth of structures farthest from that point

All of the above

Growth of structures nearest from that point

3. The most common cause of malocclusion with a Class I molar relationship is

crossbite in the posterior segments.

improper eruption of permanent first molars.

tooth size and jaw size discrepancy.

a thumbsucking habit.

4. During intrusion, the center of rotation lies:

At infinity

Inside the tooth at 1/3rd distance from apex

Outside the tooth

At CEJ

5. Ideal orthodontic tooth movement involves

frontal resorption.

large forces.

subcrestal incisions.

undermining resorption.

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

Interceptive orthodontics

Surgical orthodontics

Preventive orthodontics

Corrective orthodontics

7. According to the NORMS of the orthodontic study models, the total height of maxillary n mandibular model should be close to?

70 mm

90 mm

55 mm

60 mm

8. 12 yr old patient comes with retained primary mandibular second molar and radiograph shows congenitally missing second premolar. Most conservative approach would be

Retain the 2nd molar with minimum proximal contact stripping

Extraction of 11d molar and allowing the rest to migrate in its position

Extraction of 2nd molar and Transplantation of third molar in its place.

Extraction of 2nd molar and giving a bridge

9. Vertical height of face is measured by:

Boyle gauge

Boos gauge

Will’s gauge

All of the above

10. 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

Frankel II

Twin Block

Review at 6 years

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

self-correct.

have 2 arch orthodontic treatment.

be treated in the complete permanent dentition.

be treated with a removable appliance.

12. Which of the following materials is not used as antiflux?

Graphite

Boric acid

Calcium carbonate in alcohol

Rouge

13. In an adult Class II division 1 malocclusion case, what should be done:

Extraction of upper 2nd PM

Extraction of lower 1st PM

Extraction of lower 2nd PM

Extraction of upper 1st PM

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

Unilateral constriction of maxilla with deviated closure into unilateral crossbite

Unilateral constriction of maxilla

Bilateral constriction of maxilla

Bilateral constriction of maxilla with deviated closure into unilateral crossbite

15. Pericision is used for retention of corrected:

Impaction

Rotation

Intrusion

Extrusion

16. For planning treatment in a patient with facial asymmetry requiring orthognathic surgery, which of the following is required:

Grummons analysis

OPG

Model analysis

CBCT

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

Retraction

Protraction

Abstraction

Attraction

18. an Angle Class I occlusion, the mesiobuccal cusp of the maxillary first molar occludes with

central fossa of the mandibular first molar.

mesial marginal ridge of the mandibular first molar.

mesiobuccal cusp of the mandibular first molar.

mesiobuccal groove of the mandibular first molar.

19. Thumb sucking is normal upto what age:

5 yrs

1 yr

4 yrs

2 yrs

20. Maxillary 1st molar cusp used in Angle classification

Mesiobuccal

Distobuccal

Distolingual

Mesiolingual

Question 1 of 20