4dd MCQs 325 Orthodontics I Prof. Mey Phoung 2019

325 Questions | By Sarathpanha.dds | Last updated: Mar 22, 2022 | Total Attempts: 4020

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1.

The conjunction of the fronto-nasal suture ?
- A.
  
  Nasion
- B.
  
  Frontal
- C.
  
  Sella
- D.
  
  Nasal
- E.
  
  Basion
2.

What type of extra- oral traction when combined with fixed appliance treatment ?
- A.
  
  Headgear
- B.
  
  Mini- implant
- C.
  
  Inter- traction
- D.
  
  Intra- traction
- E.
  
  All are related
3.

High pull headgear was indicated in case of lower anterior facial height ?
- A.
  
  Increase
- B.
  
  Decrease
- C.
  
  Normal
- D.
  
  MMPA < 27 ± 3 deg
- E.
  
  Unrelated
4.

Function of active component to apply force to the teeth in order to move teeth known as ?
- A.
  
  All are related
- B.
  
  Springs
- C.
  
  Screws
- D.
  
  Labial bow ( active )
- E.
  
  Elastics
5.

Frankfort Horizontal is a reference plane constructed by joining which of the following landmarks?
- A.
  
  Porion and Orbitale
- B.
  
  Nasion and Sella
- C.
  
  Porion and Sella
- D.
  
  Porion and Nasion
- E.
  
  Basion and Orbitale
6.

The best time to correct a maxillary central incisor crossbite is ?
- A.
  
  During erupting stage of central incisors erupt
- B.
  
  After permanent canines erupt
- C.
  
  After permanent central incisors erupt
- D.
  
  After permanent lateral incisors erupt
- E.
  
  Unrelated
7.

Which of the following conditions is usually present in a Class II, Division 2 malocclusion?
- A.
  
  Lingual inclination of maxillary central incisors
- B.
  
  Open bite
- C.
  
  Steep mandibular plane
- D.
  
  Mesiocclusion of permanent first molars
- E.
  
  Unrelated
8.

The type of movement usually produced by a removable appliance is ?
- A.
  
  Tipping
- B.
  
  Torque
- C.
  
  Rotation
- D.
  
  Bodily movement
- E.
  
  Un related
9.

Anterior teeth are most likely to be fractured in children with which of the following mixed dentition malocclusions?
- A.
  
  Class II Division 1
- B.
  
  Class I
- C.
  
  Class II DIvision 2
- D.
  
  Class III
- E.
  
  There is no relation
10.

What factors that effect to relapse overbite correction after orthodontic treatment ?
- A.
  
  All are related
- B.
  
  No enough overbite
- C.
  
  No occlusal stop
- D.
  
  Growth of the mandible
- E.
  
  Unrelated
11.

The use of lateral Cephalometric radiograph in diagnosis for focusing on the skeletal pattern in dimension view ?
- A.
  
  Antero-posterior
- B.
  
  Transverse
- C.
  
  In-out
- D.
  
  All are related
- E.
  
  Unrelated
12.

What diagnosis will be found when the lateral cephalometric tracing was finished ?
- A.
  
  All are related
- B.
  
  Skeletal pattern
- C.
  
  Dental base length
- D.
  
  Soft tissue
- E.
  
  Dental factors
13.

The anterior point of the fronto-nasal suture is ?
- A.
  
  N Point
- B.
  
  A Point
- C.
  
  B Point
- D.
  
  S Point
- E.
  
  All unrelated
14.

The deepest point on the concavity of the mandibular profile between the point of chin and the alveolar crest is ?
- A.
  
  B Point
- B.
  
  A Point
- C.
  
  N Point
- D.
  
  S Point
- E.
  
  All unrelated
15.

The deepest point on the maxillary profile between anterior nasal spine and the alveolar crest is ?
- A.
  
  A Point
- B.
  
  B Point
- C.
  
  Ba Point
- D.
  
  S Point
- E.
  
  All unrelated
16.

The most posterior, inferior point on the angle of the mandible ?
- A.
  
  Go Point
- B.
  
  B Point
- C.
  
  Po Point
- D.
  
  Ba Point
- E.
  
  All unrelated
17.

The lowermost point on the mandibular symphysis ?
- A.
  
  Me Point
- B.
  
  B Point
- C.
  
  Po Point
- D.
  
  Pog Point
- E.
  
  All unrelated
18.

The maxillary plane ( Mx ) was represented by a line drawn through from ?
- A.
  
  ANS and PNS
- B.
  
  ANS and Po
- C.
  
  PNS and Or
- D.
  
  PNS and Go
- E.
  
  All unrelated
19.

The Mandibular plane ( Mn ) was represented by a line drawn through from ?
- A.
  
  Me and Go
- B.
  
  Me and Pog
- C.
  
  Me and Po
- D.
  
  Me and Ba
- E.
  
  All unrelated
20.

The most inferior point on the marginal of the orbit ?
- A.
  
  Or Point
- B.
  
  A Point
- C.
  
  B Point
- D.
  
  Po Point
- E.
  
  All unrelated
21.

The highest point on the bony external auditory meatus ?
- A.
  
  Po Point
- B.
  
  Or Point
- C.
  
  Ba Point
- D.
  
  S Point
- E.
  
  All unrelated
22.

The Franfort plane ( FP ) was represented by a line connecting from ?
- A.
  
  Po and Or
- B.
  
  Po and ANS
- C.
  
  Po and Nasion
- D.
  
  Po and Pog
- E.
  
  Unrelated
23.

The most anterior point of the bony chin ?
- A.
  
  Pog Point
- B.
  
  Me Point
- C.
  
  B Point
- D.
  
  Ii Point
- E.
  
  All unrelated
24.

Functional occlusal plane ( FOP ) was represented by a line that passes through the occlusion of the ?
- A.
  
  Mesial cusps of the most anterior permanent molar and halfway between the tips of the upper and lower central incisors
- B.
  
  Mesial cusps of the permanent molar and halfway between the tips of the upper and lower central incisors.
- C.
  
  Distal cusps of the most anterior permanent molar and halfway between the tips of the upper and lower central incisors.
- D.
  
  Distal cusps of the permanent molar and halfway between the tips of the upper and lower central incisors.
- E.
  
  All unrelated
25.

The upper anterior facial height is a line that is perpendicular to ?
- A.
  
  The Maxillary plane from the N Point
- B.
  
  The Maxillary plane from the S Point
- C.
  
  The Maxillary plane from the frontal bone
- D.
  
  The Maxillary plane from the nasal bone
- E.
  
  All unrelated