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Questions and Answers
What is the first evidence of calcification for the permanent maxillary lateral incisor?
At what age does the eruption of the permanent maxillary lateral incisor typically occur?
Which anomaly is characterized by a tooth that is smaller and has a peg shape?
Which of the following is NOT a variation of the permanent maxillary lateral incisor?
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How many roots does the permanent maxillary lateral incisor have?
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Which aspect of the maxillary lateral incisor features an incisal ridge?
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What geometric shape describes the crown of the maxillary lateral incisor from the labial aspect?
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Where is the cingulum located on the maxillary lateral incisor?
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Study Notes
Maxillary Lateral Incisor
- First evidence of calcification: 1 Year
- Enamel completed: 4 to 5 Years
- Eruption: 8 to 9 Years
- Root completed: 11 Years
Function & Appearance
- Supplements the central incisor in function.
- Resembles the central incisor in form, but smaller.
- Crown has more curvature with a rounded incisal ridge and rounded incisal angles mesially and distally.
Anomalies
- Peg-shaped lateral incisor: Smaller than normal, often resembling a peg
- Missing lateral incisor: Complete absence of the tooth
Variations
- Congenitally Missing: Tooth never develops
- Peg Lateral: Smaller than normal, often resembling a peg
- Lingual Pit & Groove: A groove on the lingual surface of the tooth. Can be a predisposition factor in localized periodontal disease.
- Lingual Tubercle: A small bump on the lingual surface of the tooth
Labial Aspect
- Geometric shape of crown: Trapezoidal
-
Mesial outline:
- Slightly convex
- Crest of curvature at the junction of middle and incisal 1/3s (contact area).
- Mesioincisal (MI) angle: rounded
-
Distal outline:
- More convex
- Crest of curvature at the center of middle 1/3s
- Distoincisal (DI) angle: more rounded
- Incisal outline: Curved and rounded
- Cervical line: Convex root-wise
-
The Root:
- Root length is greater in proportion to the crown than the maxillary central.
- Tapers evenly about 2/3 of its length, then curves distally.
- Ends in a pointed apex.
Lingual Aspect
- Mirror image of the labial aspect.
- Tapers towards the lingual.
Elevations
- Cingulum: Present at the cervical 1/3
-
Marginal Ridges:
- Mesial marginal ridge
- Distal marginal ridge
- Incisal Ridge: The cutting edge of the tooth
- Number of roots: One root.
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Description
This quiz covers fundamental information about the maxillary lateral incisor, including its calcification, eruption timelines, and characteristics. It also examines various anomalies associated with this tooth type, such as peg-shaped incisors and variations that can occur. Test your understanding of the structural aspects and functions of this important dental feature.
