Permanent Maxillary Incisors Quiz
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Questions and Answers

How many permanent maxillary incisors are present in the dental arch?

  • Two
  • Four (correct)
  • Eight
  • Six

    • What is the primary function of the maxillary incisors?

  • Shearing or cutting food (correct)
  • Mashing soft food
  • Crushing hard substances
  • Grinding food

    • When does calcification of the permanent maxillary central incisors begin?

  • 3-4 months (correct)
  • 1-2 years
  • 6-7 months
  • At birth

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

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

    Which of the following statements is true regarding the maxillary incisors?

    <p>The maxillary central incisor is larger than the lateral incisor</p> Signup and view all the answers

    What term describes the portion of the crown of an incisor before any wear has occurred?

    <p>Incisal ridge</p> Signup and view all the answers

    At what age does the root of the permanent maxillary central incisor typically complete its development?

    <p>9 years</p> Signup and view all the answers

    What is formed during the wear of an incisor that transitions it from an incisal ridge to an incisal edge?

    <p>Flattened surface</p> Signup and view all the answers

    What is the characteristic curvature of the cervical line on the mesial aspect of the maxillary central incisor?

    <p>It curves incisally to a noticeable degree</p> Signup and view all the answers

    From which aspect does the crown of the maxillary central incisor appear somewhat thicker toward the incisal third?

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

    How does the curvature of the cervical line outlining the CEJ on the distal surface compare to that on the mesial surface?

    <p>It is less on the distal surface</p> Signup and view all the answers

    What is the shape of the crown when viewed from the incisal aspect of the maxillary central incisor?

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

    Which statement about the labial outline of the crown from the crest of curvature to the incisal ridge is correct?

    <p>It is very slightly convex</p> Signup and view all the answers

    What describes the lingual outline at the region of the cingulum on the maxillary central incisor?

    <p>It's convex but becomes concave at the mesial marginal ridge</p> Signup and view all the answers

    How does the cervical portion of the labial surface of the maxillary central incisor appear?

    <p>Convex with a broad arc</p> Signup and view all the answers

    What is the direction of the outline of the lingual portion of the crown as it tapers towards the cingulum?

    <p>Tapers lingually</p> Signup and view all the answers

    What is the mesiodistal width of the permanent maxillary central incisor?

    <p>8.5 mm</p> Signup and view all the answers

    Which statement about the maxillary lateral incisor is true?

    <p>It is smaller in all dimensions except root length.</p> Signup and view all the answers

    When does the calcification of the maxillary lateral incisor begin?

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

    What can occur if there is a significant variation in the form of maxillary lateral incisors?

    <p>Developmental anomaly classification</p> Signup and view all the answers

    At what age is the root of the maxillary lateral incisor typically completed?

    <p>11 years</p> Signup and view all the answers

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

    <p>Increased risk of localized periodontal disease</p> Signup and view all the answers

    What happens in cases where maxillary lateral incisors are entirely missing?

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

    Which of the following dimensions is greater for the permanent maxillary central incisor?

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

    What is the distinguishing feature of the maxillary lateral incisor compared to the maxillary central incisor?

    <p>Its crown appears thicker from the distal aspect</p> Signup and view all the answers

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

    <p>11 years</p> Signup and view all the answers

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

    <p>Root length</p> Signup and view all the answers

    What is a characteristic feature of the incisal aspect of the maxillary lateral incisor?

    <p>The labiolingual dimension is slightly greater than the mesiodistal dimension</p> Signup and view all the answers

    Which of the following teeth is known to have a form variant referred to as 'peg shaped'?

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

    Which surface of the maxillary lateral incisor typically demonstrates the greatest curvature of the cervical line?

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

    Which of the following is NOT considered a border of the lingual fossa of a maxillary central incisor?

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

    From the distal aspect, how does the crown of the maxillary lateral incisor appear?

    <p>Thicker than the mesial aspect</p> Signup and view all the answers

    What feature separates the labial lobes on the permanent maxillary lateral incisor?

    <p>Developmental grooves</p> Signup and view all the answers

    Which characteristic describes the crown's lingual surface compared to the labial surface?

    <p>Narrower than the labial surface</p> Signup and view all the answers

    What portion of the lingual surface does the lingual fossa occupy?

    <p>2/3 of the lingual surface</p> Signup and view all the answers

    Where is the cingulum typically located on the permanent maxillary lateral incisor?

    <p>Cervical 1/3</p> Signup and view all the answers

    What shape does the mesial aspect of the permanent maxillary lateral incisor resemble?

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

    Which feature is less pronounced on the permanent maxillary lateral incisor compared to the central incisor?

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

    What is the appearance of the incisal portion of the maxillary lateral incisor compared to the central incisor?

    <p>Thicker due to heavy development</p> Signup and view all the answers

    What type of groove can develop within the lingual fossa of the permanent maxillary lateral incisor?

    <p>Deep lingual pit or developmental groove</p> Signup and view all the answers

    Study Notes

    Permanent Maxillary Incisors

    • There are four maxillary incisors
    • The maxillary central incisors are the only teeth in the mouth that have mesial surfaces in contact
    • Maxillary lateral incisors are distal to central incisors
    • The maxillary central incisor is larger than the lateral incisor
    • Incisors are shearing teeth, their function is to cut and punch food material
    • The incisal portion of the crown is called the incisal ridge

    Permanent Maxillary Central Incisor

    • Calcification begins between 3 -4 months
    • The crown of the tooth is complete between 4 -5 years.
    • The tooth erupts between 7-8 years.
    • The root is complete by 9 years.
    • On the labial aspect, the crown is trapezoidal and the shortest side is at the cervix.
    • The cervical line on the mesial surface of the central incisor curves incisally
    • The mesial outline of the crown is slightly convex.
    • The lingual outline is convex at the cingulum, concave at the mesial marginal ridge, and slightly convex at the linguoincisal ridge.
    • The distal outline of the crown gives the impression that the crown is thicker towards the incisal third.
    • The curvature of the cervical line on the distal surface is less than the curvature of the mesial surface.
    • The incisal aspect of the crown conforms to a triangular outline, the labial surface is broad and flat in comparison to the lingual surface

    Permanent Maxillary Lateral Incisor

    • Calcification begins in the first year
    • The crown of the tooth is complete between 4 -5 years.
    • The tooth erupts between 8-9 years.
    • The root is complete by 11 years.
    • The lateral incisor is smaller than the central incisor but has a longer root
    • The lateral incisor is known to vary in form
    • Lateral incisors that have a nondescript, pointed form are considered "peg-shaped"
    • The lateral incisor is sometimes missing completely
    • The presence of a palatogingival groove in maxillary incisors may be a predisposing factor in localized periodontal disease
    • The labial aspect of the tooth has three lobes, separated by two shallow groves.
    • The lingual surface is narrower than the labial surface.
    • The lingual fossa occupies two-thirds of the lingual surface.
    • The lateral incisor has a prominent cingulum limited to the cervical third.
    • The mesial aspect of the lateral incisor is triangular with its base at the cervix
    • The distal aspect of the lateral incisor is similar to the mesial but the crown appears thicker
    • Unlike the central incisor, the labiolingual dimension of the lateral incisor is larger than the mesiodistal dimension
    • The crest of curvature on the lateral incisor is at the cervical third.

    Questions

    • The maxillary lateral incisor is smaller than the central incisor in all dimensions except root length. (B)
    • The lingual fossa is bordered by the distal marginal ridge, mesial marginal ridge, and cingulum, but not the labioincisal ridge. (D)
    • The root of the permanent maxillary central incisor is complete by nine years. (A)
    • The lateral incisor has a variant form that's called peg-shaped. (B)
    • The mesial surface of the maxillary central incisor has the greatest curvature of the cervical line. (B)

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    Permanent Maxillary Incisors PDF

    Description

    Test your knowledge on the anatomy and characteristics of permanent maxillary incisors. This quiz covers the features, eruption timelines, and functions of central and lateral incisors. Perfect for dental students and professionals looking to refresh their understanding.

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