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Permanent Mandibular Molars Lecture 10
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Permanent Mandibular Molars Lecture 10

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@LuxuriousAmbiguity

Questions and Answers

Which of the following statements is NOT true about permanent mandibular molars?

  • They are three in number on each side of the mandible.
  • They all have two roots, one mesial and one distal.
  • They are the largest teeth in the mandibular arch. (correct)
  • They have crowns that are longer mesiodistally than buccolingually.

    • How many cusps does a mandibular first molar typically have?

  • Six
  • Three
  • Four
  • Five (correct)

    • What is the approximate eruption time for a mandibular first molar?

  • 6-7 years (correct)
  • 3-4 years
  • 5-6 years
  • 8-9 years

    • Which of the following is TRUE regarding the mesial root of the mandibular first molar?

    <p>It is curved mesially from the cervical line.</p> Signup and view all the answers

    What is the approximate dimension difference between the mesiodistal and buccolingual dimensions of a mandibular first molar crown?

    <p>1 mm greater mesiodistally</p> Signup and view all the answers

    Which of the following is NOT a feature observed on the buccal aspect of a mandibular first molar?

    <p>A prominent central groove running from the mesiobuccal cusp to the distobuccal cusp</p> Signup and view all the answers

    Which of the following cusps on the mandibular first molar is described as being more pointed than the other buccal cusps?

    <p>Distal cusp</p> Signup and view all the answers

    What is the shape of the crown of the mandibular first molar viewed from the buccal aspect?

    <p>Trapezoidal</p> Signup and view all the answers

    What is the relationship between the mesiodistal and buccolingual measurements of the crown?

    <p>The mesiodistal measurement is greater than the buccolingual measurement.</p> Signup and view all the answers

    How does the buccal outline of the mesial root appear?

    <p>It drops straight down from the cervical line to the junction of the cervical and middle thirds.</p> Signup and view all the answers

    Which cusp is located slightly buccal to the center buccolingually?

    <p>The distobuccal cusp</p> Signup and view all the answers

    What is the relative size of the mesiobuccal cusp compared to the other cusps?

    <p>It is slightly larger than the two lingual cusps.</p> Signup and view all the answers

    What is the shape of the tooth from the occlusal aspect?

    <p>Hexagonal</p> Signup and view all the answers

    Where is the distal contact area located?

    <p>Just below the distal cusp</p> Signup and view all the answers

    What is the shape of the apical third portion of the distal root compared to the mesial root?

    <p>More rounded</p> Signup and view all the answers

    What is the name of the developmental groove that is located on the occlusal surface?

    <p>All of the above</p> Signup and view all the answers

    Which statement correctly describes the mesial triangular fossa of the occlusal surface?

    <p>It is a smaller concave area than the central fossa.</p> Signup and view all the answers

    What is the primary characteristic of the pulp chambers in the mesial root of the permanent mandibular first molar?

    <p>They are square to rectangular.</p> Signup and view all the answers

    What is a common feature of the mesial root's root canal system?

    <p>It usually has a more complicated canal system.</p> Signup and view all the answers

    Where is the apical foramen typically located for the distal root of the permanent mandibular first molar?

    <p>At the apex of the root.</p> Signup and view all the answers

    What describes the characteristics of the distal canal in comparison to the mesial canal?

    <p>The distal canal is usually larger than the mesial canal.</p> Signup and view all the answers

    What shape generally describes the cervical cross section of the mandibular first molar?

    <p>Quadrilateral</p> Signup and view all the answers

    How do the pulp horns in the mesial root of the mandibular first molar typically present?

    <p>They are usually very prominent.</p> Signup and view all the answers

    What distinguishes the curvature of the mesial root compared to the distal root in the mandibular first molar?

    <p>The mesial root shows considerable curvature.</p> Signup and view all the answers

    What is the approximate location of the bifurcation point of the two roots?

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

    Which cusp is the widest mesiodistally on the mandibular first molar?

    <p>Mesiolingual cusp</p> Signup and view all the answers

    How does the curvature of the distal root compare to the mesial root?

    <p>The distal root is straighter</p> Signup and view all the answers

    Which of the following accurately describes the buccolingual measurement of the crown and root?

    <p>It is greater at the mesial portion</p> Signup and view all the answers

    What is the shape of the cervical line from the lingual aspect?

    <p>Irregular</p> Signup and view all the answers

    From the lingual aspect, what serves as a line of demarcation between the lingual cusps?

    <p>Lingual developmental groove</p> Signup and view all the answers

    How does the mesial outline of the crown appear when viewed from the lingual aspect?

    <p>Convex from cervical line to marginal ridge</p> Signup and view all the answers

    In terms of the roots, which assertion is correct when viewed from the lingual aspect?

    <p>The roots measure about 1 mm longer lingually than buccally</p> Signup and view all the answers

    Study Notes

    Permanent Mandibular Molars

    • Permanent mandibular molars are larger than any other mandibular teeth, with three molars on each side of the mandible.
    • All mandibular molars have crowns that are longer mesiodistally than buccolingually.
    • Each mandibular molar has two roots, one mesial and one distal.
    • The crown of the molars is shorter cervico-occlusally than anterior teeth.

    Mandibular First Molar

    • It is the largest tooth in the mandibular arch.
    • It has five well-developed cusps: two buccal, two lingual, and a distal cusp.
    • It has two well-developed roots, one mesial and one distal.
    • The dimension of the crown mesio-distally is greater by about 1 mm than the dimension bucco-lingually.
    • Eruption time: 6-7 years. Root completed: 9-10 years.

    Buccal Aspect

    • The crown of the mandibular first molar is roughly trapezoidal.
    • The mesial outline of the crown is concave at the cervical third, and the distal outline of the crown is straight above the cervical line.
    • All five cusps are in view from the buccal aspect, with the lingual cusps being higher than the others.
    • The mesio-buccal cusp, disto-buccal cusp are flat, and the distal cusp is small and more pointed than either of the buccal cusps.
    • The mesiobuccal cusp is usually the widest mesiodistally of the three cusps.

    Lingual Aspect

    • From the lingual aspect, three cusps may be seen: two lingual cusps and the lingual portion of the distal cusp.
    • The mesiolingual cusp is the widest mesiodistally, with its cusp tip higher than the distolingual cusp.
    • The lingual developmental groove serves as a line of demarcation between the lingual cusps.

    Mesial Aspect

    • When viewed from the mesial aspect, two cusps and one root only are to be seen: the mesiobuccal and mesiolingual cusps and the mesial root.
    • The buccolingual measurement of the crown and root is greater at the mesial portion than at the distal portion.

    Distal Aspect

    • The distal root is narrower buccolingually than the mesial root.
    • The distal cusp is placed a little buccal to center buccolingually.
    • The distal contact area is placed just below the distal cusp.

    Occlusal Aspect

    • The crown measurement is 1 mm or greater mesiodistally than buccolingually.
    • The buccolingual measurement of the crown is greater on the mesial than on the distal.
    • There is a major fossa and two minor fossae: the mesial triangular fossa and the distal triangular fossa.

    Pulp Cavity of Permanent Mandibular First Molar

    • The pulp chambers of the mesial root are square to rectangular in shape.
    • The mesial root usually has a more complicated root canal system because of the presence of two canals.
    • One or both of the mesial canals may be significantly curved.
    • The two canals may join each other in the apical region to exit in a common foramen, or they may have separate apical foramina.

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    Description

    This quiz covers the characteristics and features of permanent mandibular molars, including their size, number, and root structure.

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