11 - Histogenesis + Anatomy of dental pulp

Question 1

Dental pulp

Answer 1

Derived from mesenchyme + ectomesenchyme of dental epithelium

Formed from dental papilla courtesy to odontoblasts during late bell stage

Question 2

Pulp histogenesis

Answer 2

• Begins in the bud stage
• Ends when root formation is completed
• Throughout this period ⇢ pulp is in embryonic stage

Question 3

In the core of pulp

Answer 3

Basic components are arranged similar to ones in loose CT

There are 2 types of fibrillar proteins in the pulp:

• Collagen fibres ⇢ give strength to tissue - most abundant
• Elastic fibres ⇢ give elasticity to tissue via elastin

Ground substance in pulp:

• Responsible for viscoelasticity + filtration properties
• Composed of proteoglycans + adhesive glycoproteins

Functions as pulp as loose CT

• Provide matrix that binds to cells + organelles
• Give support to body (to pulp)

Question 4

Structural organisation of pulp

Answer 4

Coronal pulp

• Larger + contains more elements ⇢ cells, fibres + blood cells

Root/Radicular pulp

• Acts as conduction tube ⇢ carries blood from coronal pulp to apical canal

Question 5

Peripheral pulp

Answer 5

• Odontogenic zone ⇢ contains odontoblasts
• Cell-free zone ⇢ Weill Basal layer
• Cell-rich zone ⇢ High cell density ⇢ these cells are perivascular cells + contain subodontoblastic plexus

Question 6

Central pulp

Answer 6

• Contains major blood vessels + nerves
• Collagen fibre bundles ⇢ More numerous in root pulp
• Fibroblasts ⇢ form + destroy collagen molecules

Question 7

Outermost layer of pulp

Answer 7

• This is a layer of odontoblasts
• They are related w/elements of the peripheral pulp
• Nerve endings + capillary loop ⇢ go between odontoblasts

Question 8

Zone of Weil / Cell-Free zone

Answer 8

Contains:

• Unmyelinated nerve fibres
• Blood capillaries
• Processes of odontoblasts + fibroblasts