Pulp Anatomy and Root Morphology I & II (Ye's Version)

Question 1

What is pulp?

Answer 1

The soft tissue component of the tooth and it occupies the internal cavities of the tooth

Question 2

In general the outline of the PULP tissue resembles the _________ _______ of the tooth

Answer 2

External outline

Question 3

The pulp originates from the ________ tissue

Answer 3

Mesenchymal

Question 4

Functions of the pulp: (just the names)

3. 4.

Answer 4

1. Formative
2. Nutritive
3. Sensory
4. Defensive

Question 5

What is the 1. FORMATIVE (primary function) of pulp?

Answer 5

Involved in forming dentin and secondary dentin. Secondary dentin is formed throughout life and therfore the pulp cavity of an individual reduces in size throughout life.

Question 6

What is the 2. NUTRITIVE function of pulp?

Answer 6

BLOOD supply to the tooth

Question 7

What is the 3. SENSORY function of pulp?

Answer 7

NERVE supply to tooth

Question 8

What is the 4. DEFENSIVE function of pulp?

Answer 8

Forms reparative dentin in response to mechanical, thermal, chemical, and bacterial insults. A severe injury may result in the formation of so much reparative dentin that the pulp chamber and canal is completely obliterated.

Question 9

Internal anatomy of the Root:

The PULP CHAMBER consists of a _______, _______, and 4 ________.

Answer 9

ROOF, FLOOR, 4 WALLS - Mesial, Distal, Buccal, Lingual

Question 10

Internal anatomy of the Root:

The PULP/ROOT CANAL extends from the floor of the _________ to the _______ ________

Answer 10

Pulp chamber to the apical foramen

Question 11

Internal anatomy of the Root:

What is the apical foramen?

Answer 11

The opening of the root canal located at or near the tip of the root. The neurovascular bundle enters the root canal through here.

Question 12

Internal anatomy of the Root:

The _______________ bundle enters the root canal through the _______ ________?

Answer 12

Neurovascular bundle; Apical foramen

Question 13

Internal anatomy of the Root:

What is apical constriction?

Answer 13

The narrowest point of the root canal - usually 1/2 mm from (more coronal) the apical foramen

Question 14

Internal anatomy of the Root:

What are lateral (supplemental) canals?

Answer 14

Small branches of the main canal that come off at the right angles to the main canal

Question 15

Internal anatomy of the Root:

What are accessory canals?

Answer 15

Small branches in the apical 1/3 of the root that angle down from the main canal. Accessory canals are alos found in the furcation region of molars.

Question 16

Internal anatomy of the Root:

What is the pulp chamber shaped by?

Answer 16

Shape is determined by the contour of the crown - follows the size and number of cusps.

Question 17

Internal anatomy of the Root:

The size of the canal is affected by what 3 factors?

Answer 17

1. Age
2. Caries
3. Trauma

Question 18

Internal anatomy of the Root: Size

The size of the pulp (increases/decreases) as an individual ages?

Answer 18

Decreases

Question 19

Internal anatomy of the Root: Size

As caries/reparative dentin is formed, the pulp size (increases/decreases)?

Answer 19

Decreases

Question 20

Internal anatomy of the Root: Size

Severe trauma can result in complete __________ of the pulp space.

Answer 20

Obliteration

Question 21

Internal anatomy of the Root: Root Canal

Root canal shape options?

Answer 21

• Straight
• Curved
• S-shaped

Question 22

Internal anatomy of the Root: Root Canal

Cross section shapes?

Answer 22

Round
Ovoid
Triangular
Ribbon-shaped
etc.

Question 23

Internal anatomy of the Root: Root Canal

Length?

Answer 23

Variable but in general fall within a range

Question 24

Internal anatomy of the Root: Root Canal

Canals and Foramen: many __________ possible (will learn these in endo)

Answer 24

Combination

Question 25

Internal anatomy of the Root: Apical 1/3 of Root What is the apical delta?

Answer 25

The main canal that branches several times (breaks up into multiple canals) and exists through different foramen.

Question 26

Internal anatomy of the Root: Apical 1/3 of Root What/where are accessory canals?

Answer 26

Branch off the main channel in the apical 1/3.

Question 27

Internal anatomy of the Root: Apical 1/3 of Root Apical foramen?

Answer 27

Exit/entry of canal

Question 28

Internal anatomy of the Root: Apical 1/3 of Root Apical constriction of the canal: Usually 1/2 mm from the ____________ - point to where the endodontic tx is completed.

Answer 28

Apical Foramen

Question 29

Internal anatomy of the Root: Apical 1/3 of Root Lateral Canal: usually further from the ________ and at right angles to the canal.

Answer 29

Apex

Question 30

Pulp & Root Morph: Maxillary Central __________ shaped root

Answer 30

Inverted cone

Question 31

Pulp & Root Morph: Maxillary Central Root in cross section is described as being