Permanent Maxillary Central Incisor Quiz

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Questions and Answers

What is the correct order of events for the maxillary central incisor from first evidence of calcification to root completion?

10 years, 7 to 8 years, 4 to 5 years, 3 to 4 months

7 to 8 years, 4 to 5 years, 3 to 4 months, 10 years

4 to 5 years, 3 to 4 months, 7 to 8 years, 10 years

3 to 4 months, 4 to 5 years, 7 to 8 years, 10 years (correct)

Which of the following statements about the labial aspect of the maxillary central incisor is true?

The geometric outline of the crown is trapezoidal. (correct)

The mesial outline is more convex than the distal outline.

The incisal outline is irregular and curved.

Mamelons are absent in newly erupted maxillary central incisors.

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

Triangular with a sharp apex

Cylindrical with a pointed apex

Flat with a square apex

Cone shaped with a blunt apex (correct)

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

7 to 8 years Signup and view all the answers

Which part of the maxillary central incisor is characterized as having a sharp mesio-incisal angle?

Mesio-incisal angle Signup and view all the answers

How would you describe the distal contact area of the maxillary central incisor?

At the junction between incisal and middle thirds Signup and view all the answers

What feature is visible on the incisal ridge of newly erupted maxillary central incisors?

Mamelons Signup and view all the answers

What term is used to describe a space between the central incisors or other teeth?

Diastema Signup and view all the answers

What geometric shape describes the crown when viewed from the mesial aspect?

Wedge-shaped Signup and view all the answers

Which feature is NOT present on the lingual aspect of the tooth?

Incisal Edge Signup and view all the answers

How does the root taper compared to the crown?

Tapers lingually Signup and view all the answers

What is the shape of the cross-section of the root at the cervix?

Triangular with rounded angles Signup and view all the answers

What is the main characteristic of the cervical line curvature on the distal aspect compared to the mesial aspect?

It is shallower than mesial Signup and view all the answers

Where is the lingual fossa located in relation to the cingulum?

Below the cingulum Signup and view all the answers

Which component does NOT contribute to the elevation on the lingual surface?

Incisal Edge Signup and view all the answers

What is true about the dimensions of the crown viewed from the incisal aspect?

Greater mesiodistally than labiolingually Signup and view all the answers

Study Notes

### Permanent Maxillary Central Incisor

The maxillary central incisor is the largest of the anterior teeth and is the widest mesiodistally.
The maxillary central incisor differs from the lateral incisor in the following ways:
- The central incisor is wider
- The central incisor is longer
The central incisor, alongside its counterpart, is the only tooth that has its mesial surfaces in contact with each other.
A space between the central incisors or other teeth is called a “Diastema”.
The incisal ridge is present in newly erupted teeth, the incisal edge is created after incisal wear due to forces of mastication.

### Anatomy

The labial surface is smooth and convex with developmental lines that divide the surface into three parts (lobes).
The mesial contact area is near the incisal edge.
The distal contact area is at the junction between the incisal and middle thirds.
The mesio-incisal angle is sharp.
The disto-incisal angle is rounded.
The cervical line is convex rootwise.
The root is cone-shaped with a blunt apex.
The root is 2-3mm longer than the crown.
The lingual surface shows elevations and a concavity
- The elevations are:
  - Cingulum (present at the cervical 1/3)
  - Mesial and Distal Marginal Ridges (MMR and DMR)
  - Incisal Ridge
- The depression is:
  - Lingual Fossa
The crown tapers lingually and the lingual surface is narrower than the labial surface

### Development

1st Evidence of Calcification: 3 to 4 Months
Enamel Completed: 4 to 5 Years
Eruption: 7 to 8 Years
Root Completed: 10 Years

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Description

Test your knowledge about the anatomy and characteristics of the permanent maxillary central incisor. This quiz covers its size, shape, contact areas, and differences from the lateral incisor. Discover important dental terminology and factors influencing tooth structure.