4dd MCQs 325 Orthodontics I Prof. Mey Phoung 2019

325 Questions | Total Attempts: 4020

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Questions and Answers
  • 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

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