Orthodontic #3 – Unidontia

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

A maxillary midline diastema.

End-to-end molar relationships.

Improper axial inclination.

Posterior cross-bite with midline discrepancies.

2. Plane of reference used in transverse direction in WITS analysis:

Sella-nasion plane

Functional occlusal plane

Frankfurt horizontal plane

Palatal plane

3. Two millimeters of maxillary incisor spacing in a 3 year old is indicative of a

tooth size-arch size discrepancy.

maxillary Bolton deficiency.

persistent tongue thrusting.

normal pattern of development.

4. Cobalt-Chromium alloy (elgiloy) is not available in which of the following tempers

Black

Red

Green

Blue

5. Foetus develops infantile swallow and suckling by:

32 weeks IU life

28th week of IU life

After birth

At birth

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

two deciduous molars nearly in crossbite

mild crowding of lower permanent incisors

posterior crossbite with a functional shift

deviated midline in the absence of a functional shift

7. A 6 year old patient has a larger than average diastema between the maxillary central incisors. The radiographic examination shows a mesiodens. In order to manage the diastema, you should extract the mesiodens

only if it develops into a cystic lesion

once the patient has reached the age of 12.

after its complete eruption.

as soon as possible.

8. Continuous heavy orthodontic forces cause:

Resorption of cementum only

Hyalinization of PDL

Resorption of alveolar bone only

Rapid tooth movement

9. Model diagnostic setup for planning clear aligners in 1945 was given by:

Rickets

Tweed

Angle

Kesling

10. A steep mandibular plane angle correlates with a:

Short 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

Long anterior facial height and anterior deep bite malocclusion

11. The body of the mandible increases in length to accommodate the permanent second molar by

resorption of bone along the anterior border of the ramus and apposition of bone on the posterior border of the ramus.

apposition of bone in the condyle.

apposition of bone at the symphysis and posterior border of the ramus of the mandible.

apposition of bone on the alveolar margin and lower border of the body of the mandible.

12. The predominant type of movement produced by a finger spring on a removable appliance is

translation.

tipping.

torque.

rotation.

13. In a 17 year old male with a vertical growth pattern, deep anterior bite and crowding of dentition requires orthodontic treatment. In such a case, correction of deep bite while maintaining mandibular plane can be achieved by:

Absolute intrusion of posteriors

Relative extrusion of posteriors

Relative intrusion of anteriors

Absolute intrusion of anteriors

14. A tongue thrust is most often found in a child with

an anterior open-bite.

a bimaxillary protrusion.

a deep overbite.

an Angle Class II, division 2 malocclusion.

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

Orthognathic

Prognathic

Retrognathic

Complex

16. Increased ANB angle signifies:

Retrognathic mandible.

Bimaxillary protrusion

Prognathic mandible

Retrognathic maxilla

17. 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

18. Generalized Anterior crossbite in the primary dentition indicates:

A normal maxillo-mandibular relation

A dental malrelation

A developing Class III malocclusion

A developing Class II malocclusion

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

Frankel II

Twin Block

Review at 6 years

Bionator

20. The most significant factor in determining the prognosis of anterior crossbite correction is the

space available mesiodistally.

shape of the tooth involved.

depth of the overbite.

age of patient.

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