Dental Anatomy: Primary 2

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Questions and Answers

What characteristics define the mesial incisal angle of the upper central incisors?

Obtuse

Rounded

Sharp (correct)

Flat

Which of the following statements is true regarding the palatal view of upper central incisors?

The crown is convex.

The crown is concave. (correct)

Cingulum is absent.

Marginal ridges are undefined.

What is the primary reason for the labial inclination of the root of upper central incisors?

To allow for eruption of permanent incisor. (correct)

To enhance esthetics.

To reduce friction during mastication.

To increase strength during biting.

How does the labial crown of the upper lateral incisors compare to the upper central incisors?

Less square. Signup and view all the answers

What is the timeframe for the eruption of upper lateral incisors?

8-9 months. Signup and view all the answers

What feature distinguishes the cingulum of upper lateral incisors from that of central incisors?

Less pronounced. Signup and view all the answers

What is the primary structural feature of the root canal in upper central incisors?

One root canal and two pulp horns. Signup and view all the answers

What is the initial calcification period for the upper lateral incisors?

4 ½ months in utero. Signup and view all the answers

What is the mesial incisal angle shape of the Lower Central Incisor?

Sharp Signup and view all the answers

Which characteristic distinguishes the Lower Lateral Incisor from the Lower Central Incisor?

The crown of the Lower Lateral Incisor is fan-shaped. Signup and view all the answers

At what age does the Lower Canine typically erupt?

16-20 months Signup and view all the answers

What is a notable anatomical feature of the root of the Lower Canine?

It is triangular in cross-section and curves distally. Signup and view all the answers

What is the timing for the initial calcification of the Lower Lateral Incisor?

4 ½ months in utero Signup and view all the answers

When does initial calcification of the upper first molar occur?

5 months in utero Signup and view all the answers

What is the last developmental milestone for the upper first molar?

Root completion Signup and view all the answers

How many cusps are present on the buccal view of the upper first molar?

Two Signup and view all the answers

What is the name of the prominent bulge of enamel over the mesio-buccal root?

Tubercle of Zuckerkandl Signup and view all the answers

Which roots does the upper first molar primarily have?

Two buccal roots and one palatal root Signup and view all the answers

When does the upper first molar typically erupt?

At 12-16 months Signup and view all the answers

How many pulp horns does the upper first molar have?

Four Signup and view all the answers

What is the smaller buccal cusp of the upper first molar called?

Disto-buccal cusp Signup and view all the answers

In the palatal view of the upper first molar, which cusp is larger?

Mesio-palatal cusp Signup and view all the answers

How many canals does the upper first molar typically have?

Three Signup and view all the answers

What notable feature differentiates the upper lateral incisor from typical incisors?

It has a bulky crown appearance Signup and view all the answers

At what age does the root of the upper canine complete its development?

Approx. 3 years Signup and view all the answers

Which of the following statements is correct regarding the upper canine’s crown structure?

It has a pronounced cingulum Signup and view all the answers

What is the chronological marker for initial calcification of the upper canine?

5 months in utero Signup and view all the answers

What is the characteristic feature of the upper canine's labial view?

An enamel ridge running from the cusp tip to the cervical margin Signup and view all the answers

How many pulp horns does the upper lateral incisor typically have?

Two Signup and view all the answers

Which of the following describes the root structure of the upper canine?

Single root with one root canal Signup and view all the answers

What dental feature is commonly observed on either side of the enamel ridge of the upper canine?

Mesial and distal depressions (fossae) Signup and view all the answers

What best describes the cervical undulation observed in the upper canine?

A pronounced wave-like appearance Signup and view all the answers

What differentiates the upper canine from the upper lateral incisor in terms of pulp anatomy?

The canine has no pulp horns Signup and view all the answers

What is the primary developmental stage of the upper second molar as indicated for initial calcification?

6 months in utero Signup and view all the answers

Which cusp is the largest on the upper second molar?

Mesio-palatal cusp Signup and view all the answers

How many root canals does the upper second molar typically have?

3 root canals Signup and view all the answers

Which of the following features is associated with the palatal view of the upper second molar?

Disto-palatal groove Signup and view all the answers

At what age does the upper second molar typically complete crown formation?

10-12 months Signup and view all the answers

What type of cusp may be present on the upper second molar, as noted in the content?

Cusp of Carabelli Signup and view all the answers

Which root is typically found on the palatal side of the upper second molar?

One palatal root Signup and view all the answers

What is the typical age range for the eruption of the upper second molar?

1.75-2.5 years Signup and view all the answers

Which cusp is noted as the smallest on the upper second molar?

Disto-palatal cusp Signup and view all the answers

How many pulp horns are typically present in the upper second molar?

4 pulp horns Signup and view all the answers

Study Notes

Upper Central Incisors

Mesial incisal angle sharp
Distal incisal angle rounded
Palatal view: Crown concave
Pronounced mesial and distal marginal ridges
Large cingulum
Mesial/Distal view: Crown bulky cervically
Single root, one half inclines labially to allow eruption of permanent incisor
One root canal, 2 pulp horns (mesially and distally)

Upper Lateral Incisors

Chronology: Initial calcification ~ 4.5 months in utero, crown completion ~ 5 months, eruption ~ 8-9 months, root completion ~ 1.5-2 years.
Labial view: Crown less square than central incisor, mesial incisal angle sharp, distal incisal angle rounded.
Palatal view: Crown concave, well-defined marginal ridges, definite cingulum (less pronounced than central incisor)
Mesial view: Crown appears bulky laterally, cervical undulation, single root, one root canal, 2 pulp horns (mesially and distally)

Upper Canine

Chronology: Initial calcification ~ 5 months in utero, crown completion ~ 9 months, eruption ~ 16-20 months, root completion ~ 3 years.
Labial view: Crown is almost symmetrical, enamel ridge runs from crown tip to cervical margin, creating mesial and distal depressions (fossae). The distal surface is slightly more rounded.
Palatal view: Mesial and distal marginal ridges, pronounced cingulum, enamel ridge from cusp tip to cingulum producing mesial and distal fossae
Mesial view: Bulky crown, cervical undulation, one root, one root canal, no pulp horns

Upper First Molar

Chronology: Initial calcification ~ 5 months in utero, crown completion ~ 6 months, eruption ~ 12-16 months, root completion ~ 2-2.5 years
Buccal view: 2 cusps: large mesio-buccal, small disto-buccal. 2 buccal roots: mesio-buccal (larger cusp) and disto-buccal
Palatal view: 2 palatal cusps: large mesio-palatal, small disto-palatal, Single palatal root
Mesial view: A large bulge of enamel cervically over the mesio-buccal root called the tubercle of Zuckerkandl, 3 root canals, and 4 pulp horns (one per cusp).

Upper Second Molar

Chronology: Initial calcification ~ 6 months in utero, crown completion ~ 10-12 months, eruption ~ 1.75-2.5 years, root completion ~ 3 years.
Buccal view: 4 cusps: mesio-buccal, disto-buccal, mesio-palatal, disto-palatal. May be a palatal cusp of Carabelli. 2 buccal roots: mesio-buccal and disto-buccal
Palatal view: Oblique ridge between disto-buccal and mesio-palatal cusps, mesio-palatal cusp the largest, disto-palatal cusp the smallest, disto-palatal groove, one palatal root
Mesial view: 3 root canals, 4 pulp horns

Lower Central Incisor

Chronology: Initial calcification ~ 4.5 months in utero, crown completion ~ 4 months, eruption ~ 6.5 months, root completion ~ 1.5-2 years.
Labial view: Almost symmetrical, sharp mesial incisal angle, rounded distal incisal angle, single root, one root canal
Lingual view: Large cingulum, quite reduced mesial and distal marginal ridges, cervical undulation mesially and distally
Mesial and distal pulp horns

Lower Lateral Incisor

Chronology: Initial calcification ~ 4.5 months in utero, crown completion ~ 4.5 months, eruption ~ 7 months, root completion ~ 1.5-2 years
Labial view: Crown fan-shaped with a long mesial side and a shorter distal side. Mesio-incisal angle sharp, disto-incisal angle rounded
Lingual view: Large single cingulum, Mesial and distal marginal ridges, one root, similar to that of the deciduous central incisor, one root canal and one mesial and one distal pulp horn
Mesial view: Crown appears wedge-shaped and bulbous cervically, cervical undulation

Lower Canine

Chronology: Initial calcification ~ 5 months in utero, crown completion ~ 9 months, eruption ~ 16-20 months, root completion ~ 2.5-3 years.
Labial view: Crown convex, mesial shorter than distal incisal slope, one root (roughly triangular cross-section) curving distally and labially, one root canal, no pulp horns
Lingual view: Crown concave, mesial and distal marginal ridges, a poorly defined enamel ridge from cusp tip to cingulum, producing mesial and distal fossae, distal surface more rounded
Distal view: Cervical undulation on mesial and distal surfaces, root curved labially

Lower First Molar

Chronology: Initial calcification ~ 5 months in utero, crown completion ~ 6 months, eruption ~ 12-16 months, root completion ~ 2-2.5 years.

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Description

Explore the intricate details of upper central incisors, lateral incisors, and canines in this quiz. Test your knowledge on their anatomical features, development chronology, and canal structures. Perfect for dental students and professionals seeking to enhance their understanding of tooth anatomy.