Crown of Mandibular First Molar Anatomy
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Questions and Answers

What is the shape of the crown of the mandibular first molar?

  • Circular
  • Trapezoidal (correct)
  • Triangular
  • Rectangular

    • Which cusp is the widest mesiodistally on the lingual aspect?

  • Distolingual cusp
  • Mesiobuccal cusp
  • Distobuccal cusp
  • Mesiolingual cusp (correct)

    • How does the mesial root of the mandibular first molar curve?

  • Distally from the cervical line to the apex
  • Mesially from the cervical line to the apical third, then distally to the apex
  • Mesially from the cervical line to the middle third, then distally to the apex (correct)
  • The mesial root does not curve

    • What is the approximate distance between the cervical line and the point of bifurcation of the two roots?

    <p>3 mm</p> Signup and view all the answers

    Which of the following accurately describes the cervical line of the mandibular first molar?

    <p>Regular on the buccal aspect, irregular on the lingual aspect</p> Signup and view all the answers

    How do the roots of the mandibular first molar appear from the lingual aspect compared to the buccal aspect?

    <p>They are longer lingually than buccally</p> Signup and view all the answers

    Study Notes

    Crown of Mandibular First Molar

    • The crown is roughly trapezoidal in shape
    • All five cusps are visible from the buccal aspect
    • The mesiobuccal, distobuccal, and distal cusps are relatively flat
    • The mesial outline of the crown is concave at the cervical third, then convex at the contact area
    • The distal outline of the crown is straight above the cervical line, then convex at the distal contact
    • The surface of the buccal portion of the crown is smoothly convex

    Cusp Portions and Developmental Groove

    • The cusp portions have a developmental groove between them

    Cervical Line and Root Formation

    • The cervical line is regular
    • The point of bifurcation of the two roots is approximately 3 mm below the cervical line
    • The mesial root curves mesially from a point shortly below the cervical line, then distally to the tapered apex
    • The distal root is less curved, with some curvature possible at its apical third
    • The apex is usually more pointed than that of the mesial root

    Lingual Aspect

    • The two lingual cusps are pointed and separated by the lingual groove
    • The mesiolingual cusp is the widest mesiodistally, with its cusp tip higher than the distolingual cusp
    • The cervical line lingually is irregular
    • The roots of the mandibular first molar appear 1 mm longer lingually than buccally

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    Description

    This quiz covers the shape, outline, and surface features of the crown of a mandibular first molar. Learn about the visible cusps, curvature, and convexity of the buccal portion.

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