Anatomy of Upper Incisors

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Questions and Answers

What is the approximate length of the central incisor?

32 mm

24 mm

26 mm

28 mm (correct)

Which best describes the shape of the labial surface of the central incisor?

Circular

Rectangular

Triangular

Quadrilateral or trapezoidal (correct)

What is a prominent feature of the lingual surface of the central incisor?

A cingulum in the cervical region (correct)

A deep lingual fossa

A thick, curved margin

A flat surface

What is the mesiodistal diameter of the central incisor?

10 mm Signup and view all the answers

Which characteristic of the crown shape of the central incisor is true?

It resembles a chisel or shovel. Signup and view all the answers

What is the shape of the mesial surface of the tooth?

Triangular with a convex base Signup and view all the answers

How does the cervical curve of the distal surface compare to that of the mesial surface?

It is less prominent and more concave Signup and view all the answers

Which feature distinguishes the incisal edge of a tooth?

It typically has a bevel toward the lingual surface Signup and view all the answers

What feature marks the boundary between the crown and the root of a tooth?

Neck Signup and view all the answers

What describes the shape of the root structure of a tooth?

Conical and straight Signup and view all the answers

What is the overall length of an upper lateral incisor?

27 mm Signup and view all the answers

Which crown shape characteristic distinguishes the upper lateral incisor from the central incisor?

More convex labial surface Signup and view all the answers

What is the approximate crown length of an upper lateral incisor?

10 mm Signup and view all the answers

How does the shape of the upper lateral incisor's labial surface compare to its mesial and distal surfaces?

Trapezoidal and more convex Signup and view all the answers

What distinguishes the root of the upper lateral incisor from that of the central incisor?

Flatter in mesiodistal direction Signup and view all the answers

Which feature of the upper lateral incisor's lingual surface is emphasized in the description?

Prominent cingulum Signup and view all the answers

What is a key difference between the upper lateral incisor and the upper central incisor?

Smaller in all dimensions Signup and view all the answers

What is the mesiodistal diameter of an upper lateral incisor?

7 mm Signup and view all the answers

What is the approximate mesiodistal diameter of the incisor central inferior tooth?

6 mm Signup and view all the answers

Which description best fits the crown morphology of the incisor central inferior?

Wedge-shaped or triangular in cross-section Signup and view all the answers

How thick is the incisal margin of the incisor central inferior tooth?

1-2 mm Signup and view all the answers

What is the approximate length of the cervical region of the mesial and distal surfaces?

3 mm Signup and view all the answers

What shape describes the root of the incisor central inferior tooth?

Conical or pyramidal Signup and view all the answers

What is the approximate length of the inferior lateral incisor?

26 mm Signup and view all the answers

How does the crown of the inferior lateral incisor differ from that of the central incisor?

It is wedge-shaped and slightly inclined towards the lingual side. Signup and view all the answers

Which surface of the inferior lateral incisor exhibits more prominent anatomical features compared to the central incisor?

Lingual surface Signup and view all the answers

What is the shape of the root of the inferior lateral incisor?

Pyramidal or conoid Signup and view all the answers

Which statement is true regarding the mesial and distal surfaces of the inferior lateral incisor?

They are wider labially than on the central incisor. Signup and view all the answers

What distinct feature can be noticed at the incisal edge of the inferior lateral incisor?

It has a pronounced distal inclination. Signup and view all the answers

How does the size of the neck of the inferior lateral incisor compare to that of the central incisor?

It has larger dimensions. Signup and view all the answers

Which of the following characteristics is NOT true about the crown of the inferior lateral incisor?

It is symmetric and straight. Signup and view all the answers

What shape is the incisal edge of the tooth described as?

Quadrangular Signup and view all the answers

How does the root length compare to the crown length?

The root is 1.8 times longer than the crown. Signup and view all the answers

Which surface of the tooth is described as strongly convex mesiodistally?

Labial surface Signup and view all the answers

What is a prominent characteristic of the neck of the tooth?

Pronounced stepped dimension Signup and view all the answers

What feature characterizes the structure of the root?

Conoid shape with elongated mesial and distal surfaces Signup and view all the answers

What is the average length of the upper canine tooth?

33 mm Signup and view all the answers

Which shape describes the crown of the upper canine tooth?

Pyramidal or Conical Signup and view all the answers

What feature characterizes the labial surface of the upper canine tooth?

Pentagonal shape, wider cervically Signup and view all the answers

How many small lingual fossae are present on the lingual surface of the upper canine tooth?

Two Signup and view all the answers

Which statement is true about the mesial surface of the upper canine tooth?

It has a small triangular shape with a cervical base. Signup and view all the answers

What type of edges does the incisal edge of the upper canine tooth resemble?

Similar to the labial edge, with two sections/arms Signup and view all the answers

Which feature is typical of the distal edge on the labial surface of the upper canine tooth?

Interrogation-shaped, flowing into the cervical area Signup and view all the answers

What is the characteristic of the cervical cingulum on the lingual surface of the upper canine tooth?

It forms a ridge extending from the root. Signup and view all the answers

What is the length of the inferior canine tooth?

33 mm Signup and view all the answers

Which shape describes the crown of the inferior canine tooth?

Conoid Signup and view all the answers

Which feature is specific to the labial face of the inferior canine tooth?

Pentagonal shape Signup and view all the answers

What describes the incisal border of the inferior canine tooth?

Narrow and triangular Signup and view all the answers

Which dimension of the inferior canine tooth is wider than that of the superior canine?

Vestibulo-lingual dimension Signup and view all the answers

What shape describes the mesial and distal faces of the inferior canine tooth?

Triangular Signup and view all the answers

What feature is present on the root of the inferior canine tooth?

Longitudinal groove Signup and view all the answers

How does the labial profile of the inferior canine's mesial and distal faces appear?

Gentle curve towards the lingual Signup and view all the answers

Study Notes

Incisivo Central Superior

The size of the upper central incisor varies based on race and build.
Average measurements:
- Length: 28 mm
- Crown length: 12 mm
- Mesiodistal diameter: 10 mm
- Vestibulolingual thickness: 8 mm
The crown shape is chisel or shovel-like, wider mesiodistally than labiolingually.
The labial surface can be quadrilateral or trapezoidal.
The lingual surface is trapezoidal with a cingulum in the cervical region.
The incisal edge is narrow, approximately 1-2 mm thick, and typically bevels toward the lingual surface.
The root is conical and straight with a rounded apex.

Incisor Lateral Superior

Average measurements:
- Overall length: 27 mm
- Crown length: 10 mm
- Mesiodistal diameter: 7 mm
- Vestibulo-Lingual Diameter: 7 mm
The lateral incisor is wedge or spade shaped, similar to a central incisor, but smaller.
The labial surface is trapezoidal and more convex than the central incisor.
The lingual surface is concave and more circumscribed than the central incisor.
The incisal edge is narrow and pointed, with more lingual inclination than the central incisor.
The root is conical, straight, narrower than the central incisor, and flattened in a mesiodistal sense.

INCISIVO LATERAL INFERIOR

Average tooth length: 26 mm
Mesiodistal diameter: 6.5 mm
Vestibulo-lingual thickness: 7 mm
The crown is slender, elongated from the cervical to incisal region, and wedge-shaped.
The labial surface is more convex than that of the central incisor.
The lingual surface has more exaggerated anatomical features compared to the central incisor.
The mesial and distal surfaces are wider labially than on the central incisor.
The root is pyramidal or conoid in shape, flattened mesiodistally, thicker and wider than the central incisor's root.

INCISIVO CENTRAL INFERIOR

Approximate mesiodistal diameter: 6 mm
Approximate length from the crown to the root tip: 10mm
Lingual dimension: 6.5 mm
The crown is roughly wedge-shaped or triangular.
The labial surface is trapezoidal, convex at the cervical third.
The lingual surface is concave with a limited area and a smooth surface.
The root's shape is conical or pyramidal, with a flattened mesiodistal aspect.

CANINO SUPERIOR

Average measurements:
- Length: 33 mm
- Crown length: 12 mm
- Mesiodistal and labiolingual diameter: 9 mm
The crown is cuspid type, with a highly developed central lobe.
The labial surface is pentagonal, wider cervically.
The lingual surface is pentagonal, convex, with two small lingual fossae.
The incisal edge is pyramid-shaped with two arms.
The root is 1.8 times longer than the crown, conoid and flattened mesiodistally.

CANINO INFERIOR

Length: 33 mm (slightly longer than the superior canine)
Mesiodistal diameter: 8 mm
Vestibulo-lingual dimension: 10 mm
The crown is pyramidal or conoid, resembling the superior canine but is 1 mm larger labiolingually and 1 mm narrower mesiodistally.
The labial face is pentagonal, elongated cervico-incisally.
The lingual face is pentagonal with a concave middle third to incisal area.
The incisal border is a narrow, triangular bevel between two sloping edges.
The root is flattened quadrilateral pyramid, with prominently convex labial and lingual surfaces.

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Description

This quiz covers the anatomical features and average measurements of the upper central and lateral incisors. Questions will focus on size variations, crown shape, and root structure. Perfect for dental students seeking to enhance their knowledge of incisor anatomy.