Permanent Maxillary and Mandibular Incisors

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Questions and Answers

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

8-9 years

7-8 years (correct)

9-10 years

5-6 years

Which of the following is NOT a characteristic of the permanent maxillary central incisors?

They are located at the back of the mouth. (correct)

They are shearing or cutting teeth.

They have incisal ridges or edges.

They complete root development by around 10 years.

What is the universal number for the maxillary right central incisor?

#8 (correct)

#10

When does the calcification of the permanent maxillary central incisor begin?

3-4 months (C) Signup and view all the answers

Which of the following best describes the mesial contact area of the permanent maxillary central incisors?

The mesial surfaces are in contact with each other. (C) Signup and view all the answers

What is the age range for the completion of enamel for permanent maxillary central incisors?

4-5 years (D) Signup and view all the answers

Which of the following statements about the maxillary central incisors is incorrect?

They are primarily used for grinding food. (D) Signup and view all the answers

In terms of arch position, where are the permanent maxillary central incisors located?

Adjacent to the midline in the upper arch. (A) Signup and view all the answers

Where is the distal contact area of the mandibular lateral incisor located compared to the mesial contact area?

More cervically located (C) Signup and view all the answers

Which feature is unique to the lingual surface of the mandibular lateral incisor compared to the central incisor?

The curvature of the cervical line is offset distally (C) Signup and view all the answers

What is the typical root length of the mandibular lateral incisor in comparison to the central incisor?

Slightly longer than that of the central incisor (C) Signup and view all the answers

What describes the incisal edge of the mandibular lateral incisor?

Curves toward the distal (D) Signup and view all the answers

Which characteristic is true regarding the root of the mandibular lateral incisor?

It may display concavities on the distal surface (B) Signup and view all the answers

Which statement about the distal contact area of the mandibular incisor is accurate?

It is generally the most cervical of all mandibular incisor contacts (D) Signup and view all the answers

What is the typical age range for the completion of root development for mandibular canines?

12-14 years (A) Signup and view all the answers

Which characteristic is not typically associated with the labial surface of mandibular canines?

Highly convex (B) Signup and view all the answers

Which of the following describes the root profile of the mandibular lateral incisor?

It may have prominent concavities on both mesial and distal surfaces (A) Signup and view all the answers

How does the curvature of the cervical line differ in the mandibular lateral incisor compared to others?

It is offset towards the distal (B) Signup and view all the answers

What is a common feature associated with the tubercle on the lingual surface of the maxillary canine?

A lingual pit (A) Signup and view all the answers

At which developmental stage does the calcification of the mandibular canine typically begin?

4-5 months (B) Signup and view all the answers

What typically happens to the maxillary canine’s eruption space when it erupts after the maxillary premolars?

It can become partially closed (B) Signup and view all the answers

How is the crown form of the maxillary canine characterized?

Not varying widely (B) Signup and view all the answers

Which of the following refers to the universal number for the mandibular left canine?

#22 (C) Signup and view all the answers

The cusp of the mandibular canine is typically described as being:

Not sharply defined (A) Signup and view all the answers

What is the condition called when an individual has more teeth than the usual number?

Hyperdontia (A) Signup and view all the answers

Which anomalies are more commonly encountered in teeth?

Root anomalies (C) Signup and view all the answers

At what age does the calcification of the mandibular third molar typically begin?

8-10 years (A) Signup and view all the answers

Where is the mandibular third molar located in relation to the midline?

Last position (B) Signup and view all the answers

Which of the following is a common characteristic of mandibular third molars?

They can vary greatly in size. (D) Signup and view all the answers

What is a common positioning characteristic of the mandibular third molar?

It shares a mesial contact with the second molar. (A) Signup and view all the answers

Which of these statements about supernumerary teeth is true?

They are caused by hyperdontia. (A) Signup and view all the answers

What is a rare type of cusp anomaly that can be found in molars?

Five-cusp form (C) Signup and view all the answers

What describes the outline of the distal margin of the mandibular canine?

Convex incisocervically with a rounded distal outline. (A) Signup and view all the answers

How do the mesiodistal and labiolingual dimensions of the mandibular canine crown and root compare to the maxillary canine?

They are usually less in size. (D) Signup and view all the answers

What is the usual length comparison between the roots of maxillary and mandibular canines?

Mandibular roots are usually shorter. (C) Signup and view all the answers

Where is the height of contour located on the mandibular canine compared to the mesial outline?

More cervically located. (B) Signup and view all the answers

What characterizes the incisal outline of the mandibular canine?

It mimics the outlines of the labial aspect. (D) Signup and view all the answers

How does the cervical line of the mandibular canine differ from that of the maxillary canine?

It shows greater depth of curvature. (B) Signup and view all the answers

What is true about the lingual surface of the mandibular canine?

It generally lacks anatomical detail. (B) Signup and view all the answers

Which characteristic pertains to the mesioincisal angle of the mandibular canine?

It is obtuse in angle. (A) Signup and view all the answers

Study Notes

Permanent Maxillary Central Incisors

The maxillary central incisors are centered in the maxilla, one on either side of the median line, with the mesial surface of each in contact with the mesial surface of the other.
These teeth play a crucial role in aesthetics and phonetics.
The distal contact area is located more cervically than the mesial.
The lingual outlines are similar to the labial aspect.
The structures of the lingual surface are similar to their counter-parts on the central incisor.
The cingulum is more offset to the distal, resulting in the curvature of the cervical line also being offset distally.

Permanent Maxillary and Mandibular Lateral Incisors

The distal contact area is located more cervically than the mesial.
In the incisal aspect, the incisal edge is not straight mesiodistally like the central incisor, it curves toward the lingual in its distal portion.

Permanent Mandibular Lateral Incisor

The root length is slightly greater than the central incisor.
The root is also slightly thicker and wider.
Concavities may be found on the mesial and distal root surfaces, with the concavity in the distal being more pronounced.

Permanent Maxillary and Mandibular Canines

The cusp of mandibular canine is less well developed than the maxillary and its tip is not normally as sharp mesiodistally.
The labial surface is not as convex as the maxillary canine.
The maxillary canine normally erupts after the maxillary premolars, its space is sometimes partially closed.
The maxillary canine may erupt labially, lingually, or not at all, in which case it is impacted.

Permanent Mandibular Canines

The mandibular canine is the 3rd tooth from the midline in each lower quadrant.
It replaces the deciduous mandibular canine.
It is pentagonal, similar to the maxillary canine.
The labial surface is generally not as convex but is generally more convex than the mandibular incisors.
The crown is long, or longer incisogingivally.
The root is usually shorter, sometimes it may be as long as the maxillary canine.
Total crown plus root length is approximately the same for both canines.
The lingual surfaces and its structures are less well developed than the maxillary canine.

Permanent Maxillary and Mandibular Third Molars

The mandibular third molar occupies the 8th and last position from the midline in each mandibular quadrant.
The mandibular third molar shares its mesial contact with the permanent second molar, and there is no distal contact.
The size of third molars can range from very small to much larger than any other molar.
It is more common to find extra large mandibular third molars and extra small maxillary third molars.

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Description

This quiz covers the anatomy and features of the permanent maxillary and mandibular incisors. Learn about their roles in aesthetics and phonetics, as well as unique characteristics such as the position of contact areas and root lengths. Test your knowledge on these important dental structures.