Dental Anatomy: Primary Dentition

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Questions and Answers

At what age does the primary dentition typically complete eruption?

3.5 years

3 years

2 years

2.5 years (correct)

Which of the following teeth erupts first in the lower arch?

Canine

Lateral incisor

First molar

Central incisor (correct)

How many primary teeth are in the primary dentition?

20 (correct)

What is the eruption sequence of the maxillary lateral incisor?

9 - 13 months Signup and view all the answers

What implications does the difference in morphology of primary teeth have on clinical practice?

Differences in treatment approaches may be needed Signup and view all the answers

Which of the following is the last primary tooth to typically exfoliate?

Upper second molar Signup and view all the answers

Which primary teeth typically erupt between 12 to 18 months?

First molars Signup and view all the answers

At which age do lower canines usually erupt?

18 - 24 months Signup and view all the answers

Which primary teeth are categorized as incisors?

4 central and lateral incisors Signup and view all the answers

When does the development of primary dentition begin?

7 weeks in utero Signup and view all the answers

At what age do the lower central incisors typically begin to erupt in primary dentition?

Around 6 months Signup and view all the answers

Which of the following teeth are expected to erupt between 12 to 18 months?

1st molars Signup and view all the answers

What teeth are noted to erupt typically between 18 to 36 months?

2nd molars Signup and view all the answers

What is a characteristic of primary dentition eruption patterns?

Chronological and symmetrical Signup and view all the answers

Which primary teeth typically erupt first in the lower arch?

Lower central incisors Signup and view all the answers

At 3 years of age, which primary teeth would one typically expect to have erupted?

All primary teeth Signup and view all the answers

What should be observed regarding the timing of primary dentition eruption?

Eruption timings show significant variations Signup and view all the answers

What is the general characterization of the order of eruption for primary teeth?

Generally chronological and symmetrical Signup and view all the answers

Which primary teeth are represented by the letter 'c' in the eruption schedule?

Canines Signup and view all the answers

What is the typical timing for the eruption of the 2nd primary molars?

18 - 36 months Signup and view all the answers

What is a notable feature of primary teeth compared to permanent teeth regarding enamel and dentine layers?

Thinner enamel and dentine layers Signup and view all the answers

What is the primary clinical significance associated with the broad flat interproximal contact areas of primary teeth?

Potential for reduced caries diagnosis Signup and view all the answers

What is a common issue that may arise due to the morphology of primary teeth during endodontic treatment?

Thin splayed roots Signup and view all the answers

During which age range does the eruption of primary teeth typically begin and end?

6 months to 2.5 years Signup and view all the answers

What is the importance of the thinner enamel in primary teeth concerning caries progression?

Caries progresses to pulp more quickly Signup and view all the answers

What morphological characteristic do primary teeth feature that can complicate restorative procedures?

Narrow occlusal table Signup and view all the answers

What potential risk is associated with permanent teeth due to multiple canals present during root development?

Increased likelihood of inter-radicular lesions Signup and view all the answers

Which of the following statements regarding natal teeth is true?

They can cause feeding issues Signup and view all the answers

What common anomaly occurs in teeth that accompany a dentigerous cyst?

Eruption cyst Signup and view all the answers

What percentage of lesions in primary dentition remain undetected without the use of bitewing radiographs?

50-70% Signup and view all the answers

Study Notes

Objectives

Understand the eruption sequence of primary teeth.
Identify morphological differences between primary and permanent teeth.
Recognize implications of these differences in clinical practice.

Primary Dentition Overview

Development begins at 7 weeks gestation.
Total of 20 primary teeth: 10 maxillary and 10 mandibular.
Eruption commences around 6 months of age.
Primary dentition is considered complete by 2.5 years.

Primary Teeth Composition

Types of teeth include:
- 4 Incisors
- 2 Canines
- 4 Molars

Eruption and Exfoliation Timeline

Eruption range varies by tooth type:
- Lower central incisors erupt between 6-10 months, exfoliate at 6-7 years.
- Upper central incisors erupt between 8-12 months.
- Lateral incisors erupt between 9-13 months (upper) and 10-16 months (lower).
- 1st molars erupt between 12-18 months, exfoliate 9-11 years (upper) and 14-18 months (lower).
- Canines erupt 16-22 months (upper) and 18-24 months (lower), with exfoliation around 10-12 years.
- 2nd molars erupt 22-33 months (upper) and 24-31 months (lower).

Eruption Patterns

Eruption generally occurs in a chronological and symmetrical fashion.
Monitor for variations in eruption order and symmetry.
Investigate any premature exfoliation, especially without root resorption.

Common Anomalies

Natal teeth may be present at or soon after birth, typically caused by a lower incisor, potentially affecting feeding.
An eruption cyst is linked to dentigerous cyst formation.

Morphological Differences: Primary vs Permanent Teeth

Primary Teeth
- Thinner enamel and dentine.
- Shallow pulpal floor with multiple canals.
- Narrow occlusal table and broad, flat interproximal contacts.
- Clinical implications include quicker progression of caries to pulp and difficulties fitting restorative materials.
Permanent Teeth
- Thicker enamel and dentine layers.
- Shorter clinical crowns, providing less space for restorative bulk.
- Potential for easier pulp exposure due to morphology.

Clinical Significance

Shape of primary teeth impacts caries diagnosis; up to 60% of lesions may remain undetected without bitewing radiographs.
Thin and splayed roots in primary teeth increase risks in endodontic treatments and fractures.

Summary of Key Points

Total of 20 primary teeth categorized into incisors, canines, and molars.
Eruption starts at 6 months, concludes by 2.5 years.
Recognize significant morphological differences impacting clinical management of primary versus permanent teeth.

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Description

This quiz focuses on the morphology and eruption sequence of primary dentition. Participants will learn to describe the characteristics of primary teeth and their development process. Ideal for dental students and professionals seeking to enhance their knowledge in pediatric dentistry.