Class 1 Malocclusion

28 Questions | Total Attempts: 414

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Class Quizzes & Trivia

Class 1 Malocclusion


Questions and Answers
  • 1. 
    What is the skeletal relationship in class1 malocclusion? (3)
    • A. 

      Class 2

    • B. 

      Class 1

    • C. 

      Class 2 with incisial retroclination

    • D. 

      Class 2 with incisal proclination

    • E. 

      Class 3 with incisal proclination

  • 2. 
    What is the ANB in class 1
    • A. 

      1-5%

    • B. 

      5-10%

    • C. 

      2-4%

    • D. 

      2-6%

    • E. 

      4-5%

  • 3. 
    What is the main complaint regarding class 1?
    • A. 

      Difficulty eating

    • B. 

      Goofy appearance

    • C. 

      Crowding

    • D. 

      Crossbite

    • E. 

      Fluorosis

  • 4. 
    Which of these does not cause crowding in class 1
    • A. 

      Tooth size and number discrepency

    • B. 

      Arch size discrepency

    • C. 

      High caries risk

    • D. 

      Displaced and Impacted teeth

    • E. 

      Premature loss of deciduous/permanent teeth

  • 5. 
    What should be extracted to alleviate mild crowding in class 1?
    • A. 

      All 3's

    • B. 

      Upper 4's

    • C. 

      Lower 5's

    • D. 

      All 5's

    • E. 

      All 4's

  • 6. 
    What should be extracted to alleviate moderate to sever crowding in class 1?
    • A. 

      Lower 5's

    • B. 

      Upper 4's and lower 5's

    • C. 

      All 4's

    • D. 

      Lower 6's

    • E. 

      All 5's

  • 7. 
    What can cause spacing in class 1? (2)
    • A. 

      Missing teeth

    • B. 

      Tilting of teeth

    • C. 

      Impacted teeth

    • D. 

      Small teeth in relation to arches

    • E. 

      Bulbous cingulum

  • 8. 
    What effect can full and everted lips have regarding class 1?
    • A. 

      Goofy teeth

    • B. 

      Bimaxillary proclination

    • C. 

      Unilateral crossbite

    • D. 

      Scissor bite

    • E. 

      Bimaxillary retroclination

  • 9. 
    What is the molar relationship with class 1?
    • A. 

      MB cusp U6 lies in fissure of L7

    • B. 

      DP Cusp U6 occludes with Lingual cusp L7

    • C. 

      ML cusp U6 occludes with MB cusp L6

    • D. 

      MB cusp U6 occludes with MB groove L6

    • E. 

      MB cusp L6 occlude with MB groove U6

  • 10. 
    When is lower labial crowding most apparent in class 1?
    • A. 

      Mid - late teens

    • B. 

      Under 10

    • C. 

      Young adulthood

    • D. 

      Middle age

    • E. 

      Over 70

  • 11. 
    Why does labial crowding occur?
    • A. 

      Heavy bite

    • B. 

      Proclined upper incisors

    • C. 

      Intercanine width decreases after 9

    • D. 

      Poor OH

    • E. 

      Sugar rich diet

  • 12. 
    Which of these is not a reason for any missing upper incisor? (2)
    • A. 

      Trauma

    • B. 

      Extraction due to dilaceration

    • C. 

      Heavy bite

    • D. 

      Congenitally absent

    • E. 

      Crossbite

  • 13. 
    What percentage of caucasians may have absent lateral incisors?
  • 14. 
    Which of these is not an option for managing missing upper laterals?
    • A. 

      Implants

    • B. 

      Bridge

    • C. 

      Denture

    • D. 

      Close space by moving canine anteriorly

    • E. 

      Move central distally and create mid line diastema

  • 15. 
    Which of these is not a reason for lower labial crowding
    • A. 

      Decreased intercanine width after age 9

    • B. 

      Mesial migration of posterior teeth

    • C. 

      Erupting third molars

    • D. 

      Forward growth of mandible in conjunction with soft tissue pressures

    • E. 

      Thumb sucking

  • 16. 
    What may have an influence on your choice to open or close a space?
    • A. 

      Caries risk

    • B. 

      OH

    • C. 

      Inclination of adjacent teeth

    • D. 

      Opposing dentition

    • E. 

      Tetracycline staining

  • 17. 
    Which teeth are most commonly displaced? (2)
    • A. 

      Canines

    • B. 

      Upper incisors

    • C. 

      Lower incisors

    • D. 

      Premolars

    • E. 

      Molars

  • 18. 
    Which of these options may be utilised in the management of displaced teeth? (3)
    • A. 

      Extraction of primary tooth and space maintenance

    • B. 

      Extraction of teeth adjacent to diplaced tooth

    • C. 

      Exposure of displaced tooth and application of orthodontic traction

    • D. 

      Extraction of tooth if severly displaced

    • E. 

      Hemisection of displaced tooth

  • 19. 
    What is the main cause of crowding?
    • A. 

      Small arch

    • B. 

      Oversized teeth

    • C. 

      Too many teeth

    • D. 

      Lack of space for permanent tooth to erupt

    • E. 

      Midline diastema

  • 20. 
    Which teeth are commonly implicated in crowding?
    • A. 

      1,3,5,8

    • B. 

      2,3,4,6

    • C. 

      2,3,5,8

    • D. 

      2,4,6,8

    • E. 

      3,5,6,7

  • 21. 
    How may you manage crowding due to a lack of space for a permanent tooth to erupt? (4)
    • A. 

      Active tooth movement

    • B. 

      Retain deciduous teeth

    • C. 

      Extract retained deciduous teeth

    • D. 

      Extract supernumeries

    • E. 

      Remove any pathology e.g. dentigerous cyst

  • 22. 
    In which malocclusion can bimaxillary proclination not occur?
    • A. 

      Class 2 div 1

    • B. 

      Class 3

    • C. 

      Class 2 div 2

    • D. 

      Class 1

  • 23. 
    What is bimaxillary proclination?
    • A. 

      Rapid growth of the maxilla

    • B. 

      Buccal scissor bite

    • C. 

      Maxillary overgrowth

    • D. 

      Proclined upper and lower incisors

    • E. 

      Retroclined upper and lower incisors

  • 24. 
    What is the cause of bimaxillary proclination?
    • A. 

      Tight strap like lips

    • B. 

      Full and evert lips

    • C. 

      Presence of supernumeries

    • D. 

      Tilted anterior teeth

    • E. 

      Crowding labially

  • 25. 
    When might a class 1 malocclusion mistakenly be diagnosed as a class 2 div 1
    • A. 

      When sunil is the operator

    • B. 

      Bimaxillary proclination

    • C. 

      In severe crowding

    • D. 

      In severe spacing

    • E. 

      When deciduous teeth are retained

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