Orthodontic #1 – Unidontia

1. In an Angle Class I occlusion, which cusp of which permanent tooth moves between the mesiolingual and distolingual cusps of the mandibular second molar in a working side movement?

Mesiolingual cusp of the maxillary first molar.

Distolingual cusp of the maxillary first molar.

Mesiolingual cusp of the maxillary second molar.

Distolingual cusp of the maxillary second molar.

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

Convex and long face

Convex and short face

Concave and long face

Concave and short face

3. Seventh key of normal occlusion:

Molar relation

Bolton ratio

Crown angulation and inclination

Palatal plane

4. Most favorable for reinforcement of anchorage is:

Shifting centre of resistance apically

Tooth with intact proximal contacts

Conical roots

Tooth out of occlusion

5. While treating increased anterior overbite while keeping mandibular plane angle same, increase in molar height is compensated by:

Relative intrusion

Relative extrusion

Absolute intrusion

Absolute extrusion

6. A clinical diagnostic indication of palatal impaction of maxillary permanent canines does NOT include

midline central diastema.

lack of canine buccal bulges in a 10 year old patient.

proclined and laterally flared permanent lateral incisors.

delayed exfoliation of primary canines.

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

Stereophotogrammetry

Tc scan

Poor man cephalometry

Barium Meal

8. Which cephalometric angle does not change with treatment

ANB

Saddle angle

SNB

SNA

9. COGS analysis was given by:

Burstone and Levine

Burstone and Legan

Burstone and Merill

Burstone and Nanda

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

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

Open bite, prognathic maxilla, prognathic mandible.

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

Retrognathic mandible, retrognathic maxilla, open bite.

11. Facial plane is measured from nasion to:

Pogonion

Basion

Gonion

Menton

12. Appropriate forces for orthodontic tooth movement are

intermittent and heavy.

continuous and light.

intermittent and light.

continuous and heavy.

13. 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.

molar relationship.

severity of the Angle Class II malocclusion.

amount of overbite.

14. Which of the following muscle fibers are entrapped in case of thick maxillary labial frenum?

Orbicularis oris

Platysma

Nasoalveolar muscles

Buccinator

15. Which is the most important factor in habits

Frequency

Type of habit

Age

Intensity

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

after the maxillary premolars erupt.

as soon as possible.

after the maxillary canines are in position.

following completion of jaw growth.

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

Moyers analysis

Hixon and Oldfather

Bolton’s analysis

Carey’s analysis

18. 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.

true unilateral crossbite.

severe temporomandibular dysfunction.

19. 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:

6 hrs daily

Not related to duration

2 hrs daily

4 hrs daily

20. Pericision is used for retention of corrected:

Extrusion

Impaction

Rotation

Intrusion

Question 1 of 20