Maxillary Central and Lateral Incisors

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Author:
glparker86
ID:
231973
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Maxillary Central and Lateral Incisors
Updated:
2013-09-03 16:24:36
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Tooth Morphology
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Tooth Morphology
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  1. What are the numbers of the Central and Lateral incisors , Maxillary and Mandibular ?

    Which central incisors are larger , the mandibular or maxillary ?
    • Maxillary -7, 8, 9 , 10
    • Mandibular - 23,24,25,26

    Maxillary are larger
  2. Draw a tooth with the following terms and define them ?
    mamelons
    Cervical line (CEJ)
    Cingulum
    Lingual fossa
    Marginal Ridge
    Mamelons - projections on the incisal edge

    Cervical line (CEJ) -line where cementum and enamel meet

    Cingulum - a projection on the lingual side of the tooth

    Lingual Fossa- the depression on the lingual side

    Marginal Ridge - The ridges along the depression running cervical to incisal

  3. Which CEJ is more severe , the mesial or distal line ?
    The mesial CEJ is much more severe.
  4. What are at least five common traits of the central incisor ?
    • King's crown lingual fossa
    • Marginal ridges are more parallel
    • cingulum present
    • 2 to 3 mamelons
    • triangle from incisal view
    • Largest M-D incisal lenght
  5. Where are the maxillary central incisors located ? 

    Do they touch at there adjacent mesial surfaces ?

    What are they numbered ?

    They have the smallest M-D of all anterior teeth?T or F ?
    They are located at the midline

    Yes , they have adjacent mesial surfaces

    # 8 and 9 

    False , they are the widest M-D
  6. What is the basic crown shape facially of the maxillary central incisor ?

    Is the surface generally flat ? Y or N

    Are there developmental depressions visible? Y or N
    Basic crown shape is trapezoidal

    Y

    Y

  7. Is the incisal edge parallel to the long axis ? Y or N ?

    Where is the facial height of contour located incisal , middle , or cervical third ?

    When are mamelons visible ?
    No , it is perpendicular to the long axis.

    Cervical third

    They are usually seen in newly erupted teeth , but can also be seen if teeth are not worn down.

  8. Which side is more straight on the Maxillary central Incisor , Distal or Mesial ?

    Which angle is the sharpest , the DI or MI ?

    Where is the Mesial Contact located in terms of (HOC) third ?
    The mesial side is more straight while the distal curves outward.

    The MI is much sharper

    Mesial contact area (HOC)  at Incisal third

  9. Which outline is more convex on the 8 and 9 teeth ? Distal or Mesial ?

    Which angle is more rounded ? the DI or MI?

    Where is the distal contact (HOC) located on the distal side of the 8 and 9 tooth ?
    Distal 

    DI

    It is located at the juntion Incisal-middle third.

  10. What is the anatomical feature that lies immediate to the mesial ridge ?
    Lingual Fossa
  11. Which teeth have cingulum ? 

    Which teeth have the height of
    contour at the cervical third ?
    All Anterior teeth - 12

    All Anterior teeth - 12
  12. From the Mesial view what does the crown of the maxillary central incisor look like ?

    Is the incisal edge along the axis to the apex of the root ? Y or N

    What third is the mesial contact area in ?
    Crown basically triangular 

    Y

    • Mesial contact area is at Incisal third
  13. What is the ratio of the crown at root ?
    2/5 crown and 3/5 root.
  14. Name 4 characteristics that show you have a Central Maxillary Incisor ?
    • Presence of incisal edge, sloping lingually 
    • M-D width broad (8-9 mm)
    • Relatively flat facial surface
    • M and D incisal corners relatively sharp

  15. How do you tell the difference between the Left and Right Central Maxillary Incisors ?
    •Mesial outline straighter than distal*      (distal has more convexity than mesial)

    •MI angle is sharper than DI*

    •Mesial height of contour more incisal  than distal*

    •CE line curvature is more on the mesial than the distal

  16. Where is the lateral maxillary incisors located ? 

    What are the Universal numbers associated with those teeth ?

    What is different about the central and lateral maxillary teeth?
    Second tooth from mid-line, Between maxillary central and  maxillary canine

    #7 and #10 

    It tends to be more rounded , smaller in all dimensions except for root.Displays more variation in form*
  17. What is the most special thing about the maxillary lateral incisor ?
    Displays more variation in form* of all incisors ,however the 3rd molar shows more variation.
  18. What is similar about lateral and central maxillary incisor ?
    It generally has smaller dimensions , but the ROOT ASPECT IS THE SAME crown 2/5 root 3/5
  19. Is the mesial outline of the lateral maxillary incisor  more convex than the central maxillary incisor ? Y or N
    • Y, the mesial outline of the lateral is more convex than the central.
  20. Is the distal or mesial outline more convex on the maxillary lateral incisor ?
    • The Distal Incisal corner is much more convex.
  21. Which incisor has the greatest rounding ?

    Which has a deeper lingual fossa , lateral or central maxillary incisors ?

    What is the shape of the lateral maxillary incisor  lingual fossa ?

    Which of the two have more prominent marginal ridges ?

    Which has a lingual pit ?
    Maxillary lateral incisors 

    lateral maxillary incisors 

    Pope's hat or triangular

    lateral maxillary incisors have more prominent ridges.

    Lateral maxillary incisor

  22. Is the facial outline of the maxillary lateral incisor convex ? Y or N

    Is the lateral maxillary incisor's lingual outline U shaped looking from the mesial or distal view ?

    Is the Incisal edge inline with the axis of the tooth ? Y or N
    Y

    No, it is S-shaped 

    Y
  23. Is the height of contour more cervical or incisal on the Maxillary lateral Incisor ?
    It is more cervical and similar to it's mesial side.

  24. Does the maxillary lateral incisor have more convexity than the maxillary central incisor? Y or N

    Compare and contrast the MD and FL lengths of this tooth? is it the same or different ?

    Where is the Incisal edge located relative to facio-lingual dimension ?
    Y

    MD ≥ FL dimension

    • It is right in the middle 
  25. How many roots does the lateral maxillary incisor possess ?

    Which way does the root/s face ?
    A single Root 

    the root is deflected distally

  26. Which tooth has more variations then the maxillary incisor lateral ?

    Can this tooth be congenitally missing ? Y or N

    Do these teeth ever have a peg shaped form ? Y or N
    the 3rd molar 

    Y

    Y

  27. How do you tell if you have Maxillary Lateral Incisor ?
    •Smaller in size than max central

    •More distinct lingual anatomy

    •Presence of deeper lingual fossa

    •Presence of lingual pit

    •Incisal outline more rounded

    •M and D outlines more rounded
  28. How do you tell if you have a right or left Maxillary Lateral Incisor ?
    •MI corner sharper than DI corner*

    •Mesial height of contour more incisal than distal’s*

    •Distal outline more convex*

    •Apex deflected distally
  29. Explain the aspects of measurement ?

    Total Length 

    Mesial -Disatl

    Cervical 

    Length wise
  30. What teeth have Lingual Fossa ?
    All anterior
  31. Which incisor is most rounded ?
    Maxillary lateral incsor
  32. Explain the difference between the MD vs FL from the incisal view of the Central and Lateral Incisor ?
    • Central Incisor - MD > FL
    • Lateral incisor - MD > FL

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