Maxillary First Molar Anatomy
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Questions and Answers

What is the characteristic feature of the buccal aspect of the maxillary second molar?

  • The buccal groove is located more distally resulting in a larger MB cusp (correct)
  • The buccal roots are more divergent
  • The buccal groove is located more mesially
  • DB cusp is larger than MB cusp

    • What can be seen on the distal aspect of the maxillary second molar?

  • Distobuccal convergence
  • Concave surface with a contact area
  • Small DB cusp and more of MB cusp is seen (correct)
  • Convex surface with a contact area

    • What is the main difference between the maxillary second and third molars in terms of their roots?

  • The roots of the maxillary third molar are more divergent
  • The maxillary second molar has a shorter root trunk
  • Fused roots are very common in the maxillary third molar (correct)
  • The maxillary third molar has a longer root trunk

    • What is the characteristic feature of the occlusal aspect of the maxillary second molar with a 4-cusp type?

    <p>Rhomboidal outline is more extreme due to lingual convergency</p> Signup and view all the answers

    What is the characteristic feature of the lingual aspect of the maxillary third molar?

    <p>Usually one large lingual cusp is present with no lingual groove</p> Signup and view all the answers

    What can be seen on the mesial aspect of the maxillary second molar?

    <p>The same BL dimensions as the maxillary first molar</p> Signup and view all the answers

    What is the characteristic feature of the maxillary third molar in terms of its size and contour?

    <p>It varies in size and contour to other teeth</p> Signup and view all the answers

    What is the characteristic feature of the buccal roots of the maxillary second molar?

    <p>They are more parallel and more distally inclined than the maxillary first molar</p> Signup and view all the answers

    What is the characteristic feature of the maxillary second molar with a 3-cusp type?

    <p>Very small or absent distolingual cusp with a triangular outline</p> Signup and view all the answers

    What is the characteristic feature of the distal aspect of the maxillary third molar?

    <p>Convex surface with no contact area</p> Signup and view all the answers

    Study Notes

    Maxillary First Molar

    • Largest tooth in the maxillary arch, centrally positioned.
    • Features four developed cusps and one supplementary cusp (Cusp of Carabelli).
    • Buccal aspect exhibits a trapezoidal crown outline with a flat mesial and convex distal contour.
    • Cervical outline is irregularly convex, occlusal outline shows visibility of four cusps.
    • Mesio-buccal cusp is broader and less sharp compared to the distobuccal cusp.
    • Elevations on the buccal surface are convex with maximum convexity at the cervical ridge.
    • Buccal developmental groove (buccal D.G.) divides the surface symmetrically, may fade or end in pits.
    • Roots consist of mesio-buccal, disto-buccal, and palatal roots, with trifurcation at the cervical-middle junction.
    • MB root curves distally, and DB root remains straighter with all roots inclined distally.
    • Lingual aspect showcases no lingual convergence; mesial outline forms an angle with the mesial slope of the ML cusp (90 degrees).
    • ML cusp is notably the largest, while the Cusp of Carabelli is found in 60% of cases.
    • Mesial aspect is characterized by an inverted trapezoid outline, with the mesial marginal ridge being higher and more prominent.
    • Distal aspect reveals a shorter and narrower profile compared to the mesial aspect.
    • Occlusal outline is rhomboid, with cusps ordered by size from largest to smallest: ML, MB, DB, DL, and Cusp of Carabelli.
    • Major fossa includes triangular central fossa and elongated distal fossa, with minor mesial and distal triangular fossae.
    • Developmental grooves include buccal, central, and transverse grooves of the oblique ridge.

    Maxillary Second Molar

    • Crown is smaller in mesiodistal and cervico-occlusal dimensions, with longer root trunk compared to the first molar.
    • Buccal groove is positioned more distally resulting in a larger MB cusp relative to the DB cusp.
    • Distobuccal convergence observed, with a tendency for root fusion.
    • Lingual aspect shows a smaller DL cusp; absence of Cusp of Carabelli.
    • Mesial aspect retains similar buccolingual dimensions but with less crown length than the first molar.
    • Distal aspect has noticeable distobuccal convergence, revealing more MB cusp visibility.
    • Occlusal aspect commonly appears with four cusps; features a more extreme rhomboid shape due to lingual convergence.

    Maxillary Third Molar

    • Crown is smaller than that of the second molar, characterized by shorter roots and more prominent root trunk.
    • Root fusion is commonly observed, giving it a developmental anomaly appearance.
    • Buccal aspect features shorter and narrower crown dimensions, with often fused roots.
    • MB cusp is larger than DB cusp, with roots inclined distally.
    • Lingual aspect typically presents one large lingual cusp; sometimes with poorly developed DL cusp.
    • Mesial aspect reflects common root fusion; bifurcation occurs apically or may be absent.
    • Distal aspect characterized by convex surface and lack of contact area, leading to a short and narrow appearance.

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    Description

    Explore the characteristics and features of the maxillary first molar, including its position, cusps, and outline. Learn about the buccal aspect, crown, and cervical outline of this important tooth.

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