Permanent Maxillary Incisors Quiz
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Permanent Maxillary Incisors Quiz

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Questions and Answers

How many permanent maxillary incisors are there?

  • Four (correct)
  • Six
  • Two
  • Eight

    • What is the primary function of the maxillary incisors?

  • Grinding food
  • Shearing and cutting food (correct)
  • Crushing food
  • Mashing food

    • At what age does the eruption of the permanent maxillary central incisor typically occur?

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

    • What shape is the labial outline of the crown of the permanent maxillary central incisor?

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

    What distinguishes the incisal edge from the incisal ridge?

    <p>The edge is a merging of two flat surfaces.</p> Signup and view all the answers

    What is the calcification timeframe for the permanent maxillary central incisor?

    <p>3-4 months</p> Signup and view all the answers

    What occurs to the incisal ridge of an incisor after significant wear?

    <p>It transitions into an incisal edge.</p> Signup and view all the answers

    Which statement is true regarding the maxillary central and lateral incisors?

    <p>Both have similar anatomical structures.</p> Signup and view all the answers

    Which dimension of the permanent maxillary central incisor is greater?

    <p>Mesiodistal dimension</p> Signup and view all the answers

    At what age does the crown of the maxillary lateral incisor complete its development?

    <p>4-5 years</p> Signup and view all the answers

    Which of the following is true about the maxillary lateral incisor?

    <p>It is smaller than the central incisor except for root length.</p> Signup and view all the answers

    What is the significance of a palatogingival groove in maxillary incisors?

    <p>It is a predisposing factor for localized periodontal disease.</p> Signup and view all the answers

    What happens if the lateral incisors are missing in some individuals?

    <p>The canine may contact the central incisor distally.</p> Signup and view all the answers

    What is described as peg-shaped laterals in maxillary incisors?

    <p>Variations where the incisor has a pointed form.</p> Signup and view all the answers

    How does the mesiodistal width of the permanent maxillary central incisor compare to its labiolingual width?

    <p>Mesiodistal width is greater.</p> Signup and view all the answers

    At what age does calcification of the maxillary lateral incisor begin?

    <p>1 year</p> Signup and view all the answers

    What is the Cervicoincisal (CI) Length of the permanent maxillary central incisor?

    <p>10.5 mm</p> Signup and view all the answers

    Where is the crest of curvature of the mesial outline located?

    <p>At the incisal third</p> Signup and view all the answers

    What shape is the root of the permanent maxillary central incisor?

    <p>Cone shaped with a blunt apex</p> Signup and view all the answers

    Which angle is relatively sharp on the permanent maxillary central incisor?

    <p>Mesioincisal angle</p> Signup and view all the answers

    What is the mesiodistal diameter at the cervix of the permanent maxillary central incisor?

    <p>7.0 mm</p> Signup and view all the answers

    What features differentiate the labial and palatal aspects of the maxillary central incisor?

    <p>The lingual outline is the reverse of the labial aspect</p> Signup and view all the answers

    Which description is accurate for the distal outline of the crown?

    <p>More convex than the mesial outline</p> Signup and view all the answers

    What developmental grooves are associated with the permanent maxillary central incisor?

    <p>Mesiolabial and distolabial</p> Signup and view all the answers

    What shape does the labial outline of the crown of the permanent maxillary lateral incisor resemble?

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

    How does the mesial outline of the crown of the permanent maxillary lateral incisor differ from that of the central incisor?

    <p>It resembles the central incisor with a rounded mesioincisal angle</p> Signup and view all the answers

    What is the typical crown length difference between the permanent maxillary lateral incisor and the central incisor?

    <p>Shorter by 2 to 3 mm</p> Signup and view all the answers

    Where is the mesial contact area located on the permanent maxillary lateral incisor?

    <p>At the junction of the incisal and cervical thirds</p> Signup and view all the answers

    How does the distal outline of the crown of the permanent maxillary lateral incisor appear?

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

    What is the curvature direction of the cervical line of the permanent maxillary lateral incisor?

    <p>Curves toward the root</p> Signup and view all the answers

    How does the root of the permanent maxillary lateral incisor taper?

    <p>It tapers evenly and then curves sharply from two-thirds of its length</p> Signup and view all the answers

    Where is the crest of contour distally located on the permanent maxillary lateral incisor?

    <p>In the center of the middle third</p> Signup and view all the answers

    Which dimension does the maxillary lateral incisor exceed the maxillary central incisor?

    <p>Curvature of the mesial cervical line</p> Signup and view all the answers

    Which structure is not considered a border of the lingual fossa of a maxillary central incisor?

    <p>Labioincisal edge</p> Signup and view all the answers

    At what age is the root of the permanent maxillary central incisor typically complete?

    <p>10 years</p> Signup and view all the answers

    Which tooth is known for having a variant in form referred to as 'peg shaped'?

    <p>Maxillary lateral incisor</p> Signup and view all the answers

    In the distal aspect of the maxillary lateral incisor, how does the crown appearance differ from the mesial aspect?

    <p>It appears thicker</p> Signup and view all the answers

    How does the incisal aspect of the maxillary lateral incisor compare to that of the central incisor?

    <p>The crown is more convex labially</p> Signup and view all the answers

    Which aspect of the maxillary lateral incisor is associated with the palatogingival developmental groove?

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

    What is the characteristic of the mesiodistal dimension of the maxillary lateral incisor compared to the central incisor?

    <p>It is slightly smaller in the lateral incisor</p> Signup and view all the answers

    Study Notes

    Permanent Maxillary Incisors

    • The maxillary incisors are four in number, the central incisors are centered in the maxilla with mesial surfaces in contact.
    • Maxillary and mandibular central incisors are the only teeth in the dental arches with mesial surfaces in contact.
    • The maxillary lateral incisor is distal to the central incisor.
    • The maxillary central incisor is larger than the lateral incisor.
    • The incisors' primary function is to shear and cut food during mastication.
    • Incisal ridges are found on incisors while cusps are found on canines and posterior teeth.
    • The incisal ridge encompasses the entire incisal portion of the newly erupted tooth.
    • The incisal edge is formed by the junction of the linguoincisal and labial surfaces due to occlusal wear.

    Permanent Maxillary Central Incisor

    • Calcification & Eruption: Calcification begins at 3-4 months, crown completion at 4-5 years, eruption at 7-8 years, and root completion at 9 years.
    • Labial Aspect: The crown is trapezoidal with the shortest side cervically, cervicoincisal length is 10.5mm, mesiodistal diameter is 8.5mm, and mesiodistal diameter at the cervix is 7.0mm.
    • Labial Aspect: The mesioincisal angle is sharp, while the distoincisal angle is rounded.
    • Labial Aspect: The distal outline is more convex than the mesial outline. The crest of curvature for the mesial outline is at the incisal third.
    • Labial Aspect: The crest of curvature for the distal outline is at the junction of the incisal and middle third. The incisal outline is usually straight and regular, with mamelons present on newly erupted teeth.
    • Labial Aspect: The cervical outline curves towards the root and is part of a semicircle.
    • Labial Aspect: The root is cone-shaped with a blunt apex located slightly distal to the center, with no developmental depressions.

    Permanent Maxillary Lateral Incisor

    • Calcification & Eruption: Calcification begins at 1 year, crown completion at 4-5 years, eruption at 8-9 years, and root completion at 11 years.
    • The maxillary lateral incisor is smaller than the central incisor in all dimensions except root length.
    • Some individuals may have peg-shaped lateral incisors or missing lateral incisors, leading to central incisor contact with the canine.
    • The palatogingival groove may predispose to localized periodontal disease.
    • Labial Aspect: The crown is trapezoidal with the shortest side cervically, with more outward curvature and rounded incisal angles.
    • Labial Aspect: The mesial outline is similar to the central incisor but with a more rounded mesioincisal angle.
    • Labial Aspect: The distal outline is rounded, with the mesial crest of curvature at the junction of the incisal and middle thirds, and the distal crest of curvature more cervical.
    • Labial Aspect: The cervical line curves towards the root, but the curvature is greater than the central incisor.
    • Labial Aspect: The root tapers to two-thirds of its length apically and then curves distally, ending in a pointed apex.
    • Mesial Aspect: The root apex may have a labial curvature.
    • Distal Aspect: Similar to the mesial aspect except the crown is thicker, the distal contact area is at the middle third, and the palatogingival groove may extend onto the root.
    • Incisal Aspect: Similar to the central incisor but the labial crown is more convex, mesiodistal dimension is smaller than the labiolingual, and the incisal ridge and cingulum are more prominent.

    Questions & Answers

    • The permanent maxillary lateral incisor is smaller than the maxillary central incisor in all dimensions except root length.
    • The labial edge is not a border of the lingual fossa of a maxillary central incisor.
    • The root of the permanent maxillary central incisor is complete by 9 years.
    • The tooth that has a variant in form known as being "peg shaped" is the maxillary lateral incisor.
    • The surface that demonstrates the greatest curvature of the cervical line is #7 distal.

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    Permanent Maxillary Incisors PDF

    Description

    Test your knowledge on the structure and function of permanent maxillary incisors. This quiz covers details regarding the incisors, their calcification, eruption, and comparison between central and lateral incisors. Perfect for dental students and professionals looking to refresh their understanding.

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