Occlusion-operative & Orthodontics Exercises

30 Questions | Total Attempts: 157

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Occlusion-operative & Orthodontics Exercises

30 Questions 30 Minutes


Questions and Answers
  • 1. 
    Which of the following is TRUE about intercuspal contact?
    • A. 

      Contact between the cusp tip to fossa and marginal ridge of opposing tooth

    • B. 

      Contact between cusp tip to the cusp ridge and inclination of the opposing tooth

    • C. 

      Refer to the position of the jaw when the teeth in maximum intercuspation

    • D. 

      Heavy tooth contact in clenching

  • 2. 
    The greatest number (100%) of contact occurs between...
    • A. 

      Molars

    • B. 

      Premolars

    • C. 

      Anterior teeth

    • D. 

      Canine

  • 3. 
    Which of the following is TRUE about class II.2 occlusion?
    • A. 

      Retroclined upper anterior

    • B. 

      Lower incisal occlude middle third of palatal aspect of upper teeth

    • C. 

      Proclined maxillary incisors or normally inclined

    • D. 

      Forward mandibular position

  • 4. 
    Jaw opening muscle is?
    • A. 

      Digastric muscle

    • B. 

      Masseter muscle

    • C. 

      Temporalis muscle

    • D. 

      Median pterygoid muscle

  • 5. 
    All of the following will increase the posterior guidance EXCEPT:
    • A. 

      Absence of missing teeth

    • B. 

      Tilting and drifting of teeth

    • C. 

      Curve of Spee 

    • D. 

      Curve of Wilson

  • 6. 
    Which of the following factors should be in the course of occlusal examination EXCEPT:
    • A. 

      Limited interarch space

    • B. 

      No attrition of teeth and restoration

    • C. 

      Equally distributed of the number and position of occlusal contact

    • D. 

      None of the above

  • 7. 
    Which of the following is NOT influence the selection of restorative materials?
    • A. 

      The correction of balancing side

    • B. 

      Number and position of ooclusal contacts

    • C. 

      Force of the occlusion load

    • D. 

      Manner of occlusion of opposing teeth in excrusive function

  • 8. 
    Which of the following is FALSE?
    • A. 

      Functional cusp of upper tooth is bucccal cusp while lower tooth is lingual 

    • B. 

      Individuals may have satisfactory aesthetics and occlusal function with reduced number of posterior teeth

    • C. 

      Occlusal guidance influence the sagital and frontal closing path over the final 0.5mm of jaw movement into tooth contact

    • D. 

      Tooth compression within the periodontal space in healthy periodontal tissue is 100μm 

  • 9. 
    Which of the following is a TRUE statement?
    • A. 

      Horizontal force which is incline to the long axis of the tooth for a long period of time is a occlusal traumatism

    • B. 

      Downhill of the cusp is an inner incline extends from the cusp tip to central groove

    • C. 

      Occlusal contacts must be guided by the horizontal forces on the teeth

    • D. 

      Holding boundary in upper molar is distal to contact dot

  • 10. 
    All of the following is TRUE about holding boundary EXCEPT:
    • A. 

      It is a minute area on the cusp seat at which an opposing cusp tip touches the cusp seat, stabilizes the mandible, result in axial forces

    • B. 

      Slight occlusal rise in the contour of occlusal seat

    • C. 

      Continuous with the pinpoint contact in an upper and lower cusp seat

    • D. 

      Prevent mandibular slipping and stabilize the mandible in centric occlusion

  • 11. 
    Primary occlusal contact is between lower buccal cups and upper fossa
    • A. 

      True

    • B. 

      False

  • 12. 
    Freedom area, the maximal intercuspal position is slightly posterior to centric relation
    • A. 

      True

    • B. 

      False

  • 13. 
    Cusp to marginal ridge relationship have two point contact while cusp to fossa relationship have multiple point contact
    • A. 

      True

    • B. 

      False

  • 14. 
    In crossbite occlusal contact relationship, the working cups are the lower lingual cusps and the upper buccal cusps
    • A. 

      True

    • B. 

      False

  • 15. 
    Centric relation is the intercuspal contact when the jaw and condyles are in centric occlusion
    • A. 

      True

    • B. 

      False

  • 16. 
    Intercuspal contact is the contact between the cusp, fossa and marginal ridge of opposing teeth
    • A. 

      True

    • B. 

      False

  • 17. 
    Protrusive jaw movement is the rest position
    • A. 

      True

    • B. 

      False

  • 18. 
    Maximum intercuspation occurs with heavy bite force when the number and area of tooth contact is less than light tooth contact 
    • A. 

      True

    • B. 

      False

  • 19. 
    Group function defined as an occlusion in which the occlusal load in lateral excursion is distributed across at least two pairs of teeth on the working side
    • A. 

      True

    • B. 

      False

  • 20. 
    Up hill of the cusp is refer to outer incline extends from cusp tip to outer surface of tooth while stabilizing contact refer to contact between upper lingual cusp and lower fossa
    • A. 

      The first statement is false and the second statement is true

    • B. 

      Both statements are false

    • C. 

      Both statements are true

    • D. 

      The first statement is true and the second statement is false

  • 21. 
    Which of the following is NOT a key of normal occlusion?
    • A. 

      Curve of Wilson

    • B. 

      Molar inter arch relationship

    • C. 

      Rotation

    • D. 

      Tight contacts

  • 22. 
    All of the followings are normal features of adult occlusion EXCEPT:
    • A. 

      Presence pf a diastema between 8-12 years of old

    • B. 

      Lower arch is U-shaped

    • C. 

      Mesial slope of upper canine cusp occludes with the distal slope of lower canine

    • D. 

      Both dental arches have common occlusal plane with MI during closure

  • 23. 
    Which of following statements is NOT suitable for complete denture?
    • A. 

      Should be NON Balanced occlusion

    • B. 

      Functional and non functional sides contact simultaneously in excursive movements

    • C. 

      Less likely to dislodge

    • D. 

      Not causing denture sore

  • 24. 
    Which of the following statements is TRUE?
    • A. 

      Mesiolingual cusp of the maxillary first molar was seated in the central fossa of the mandibular first molar.

    • B. 

      Distobuccal cusp of the upper first permanent molar fell within the buccal groove the lower first permanent molar.

    • C. 

      The mesial surface of the distobuccal cusp of the first permanent molar contact and  occluded with the distal surface of the mesiobuccal cusp of the lower first molar.  

    • D. 

      In normal occlusion the gingival portion of the long axis of the crown was mesial to the incisal portion

  • 25. 
    Balanced occlusion is not suitable for natural dentitions
    • A. 

      True

    • B. 

      False

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