Orthodontic #3 – Unidontia

1. Which of the following Class II Division 1 malocclusion(s) is/are most likely to be corrected with a cervical headgear?

Retrognathic mandible, retrognathic maxilla, open bite.

Increased lower anterior face height, prognathic mandible, retrognathic maxilla.

Open bite, prognathic maxilla, prognathic mandible.

Prognathic maxilla, decreased lower face height, increased over bite.

2. Vertical height of face is measured by:

Will’s gauge

Boos gauge

Boyle gauge

All of the above

3. If the centre of rotation is present at the centre of bracket slot orthodontic movement that occurs is

Torquing

Uncontrolled tipping

Translation

Controlled tipping

4. An Angle Class II, division 1 malocclusion can be differentiated from an Angle Class II, division 2 malocclusion based upon the

inclination of maxillary incisors.

severity of the Angle Class II malocclusion.

amount of overbite.

molar relationship.

5. Eruption path of posterior maxillary permanent teeth is directed:

Downward and distal

Downward and labial

Downward and mesial

Downward and buccal

6. The most common cause of an anterior cross bite in mixed dentition is:

Prolonged retention of deciduous teeth

Jaw discrepancy

Thumb sucking

Premature exfoliation of primary tooth

7. 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

Twin Block

Bionator

Review at 6 years

Frankel II

8. Which of the following soft tissues of the oro facial region mature first:

Tip of tongue

All soft tissues mature simultaneously

Posterior 1/3rd of tongue

Lips

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

adequacy of mesio-distal space.

developmental age of the patient.

sequence of eruption of the permanent dentition.

morphology of the anterior teeth.

10. Bone remodeling theory of craniofacial growth was given by

Van der claw

John hunter

Brash

Melvin and Sicher

11. Labiodental sounds are affected in:

Class III malocclusion

Class I type 1 malocclusion

Class I type 2 malocclusion

Class IT malocclusion

12. Adenoids lead to:

Vertical descent of mandible

Vertical descent of maxilla

Vertical ascent of mandible

Vertical ascent of maxilla

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

Convex and short face

Concave and short face

Concave and long face

Convex and long face

14. In an ideal Class I occlusion, the cusp of which mandibular tooth is in contact with the central fossa of the maxillary second molar?

Mesiobuccal cusp of the first molar.

Distobuccal cusp of the second molar.

Distobuccal cusp of the first molar.

Mesiobuccal cusp of the second molar.

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

tipping.

rotation.

translation.

torque.

16. Thumb sucking in child leads to change in facial profile (dental and skeletal changes), if the child performs the habit at least for how much time:

Not related to duration

4 hrs daily

6 hrs daily

2 hrs daily

17. Apertognathia means:

Reversed overjet

Open bite

Increased overjet

Deep bite

18. The most appropriate opportunity for orthodontic treatment involving growth manipulation is

after the eruption of third molars.

after skeletal growth is complete.

during the period of greatest growth velocity.

during the late primary dentition.

19. Xi point is seen in which of the following analysis:

Down

Ricketts

Steiner

Sassouni analysis

20. Continuous heavy orthodontic forces cause:

Resorption of alveolar bone only

Rapid tooth movement

Hyalinization of PDL

Resorption of cementum only

Question 1 of 20