Summary

Dental Tissues Summary Notes - Dentistry Year 1

0 purchase

Institution
Kings College London (KCL)

Concise and easy to access notes on dental tissues for first year dental students. Covers the physiology of enamel, dentin, the dental pulp, alveolar bone, cementum and periodontal ligament (PDL).

[Show more]

Preview 2 out of 6 pages

View example

Uploaded on May 8, 2024
Number of pages 6
Written in 2022/2023
Type Summary

Enamel
Physical Properties
• Hard / brittle
• 96% inorganic hydroxyapatite
(Ca10(PO4)6(OH)2)
• 1% organic and 3% water
• Grayish-white, but appears yellow due
to dentin
• 2mm thick

Surface Features
• Mamillons: surface swellings on incisal edge
• Perikymata: grooves (external manifestations of striae of Retzius), prominent on
cervical and facial regions, produced by ends of rod groups
• Tomes’ Process Pits: projections of secretory ends of ameloblasts at EDJ
• Enamel Pearls: hills and troughs on cervical region of tooth

Lines
• Incremental Lines: Enamel Prisms / Rods
o Cross striations due to alternating • Formed by ameloblasts
sizes of enamel rods • 4-7um diameter, 9um long
o Indicate daily changes in matrix
• Outer 1/3 is relatively straight and
secretion
perpendicular to EDJ
• Retzius Lines:
• Inner 1/3 has decussations (crossing
o Brown incremental lines
of rods) → ‘horseshoe’ boundary
o Represent changes in matrix
• Different groups of rods bend at
secretion every 7-9 days
different angles → Hunter-Shreger
o Oblique to longitudinal arrangement
bands
• Neonatal Line:
o An accentuated Retzius line formed
due to changes at birth

Enamel-Dentin Junction
• Lamellae: hypomineralised enamel matrix extending
from EDJ linearly (susceptible to decay)
• Tufts: small, darkly stained, hypomineralised,
branching defects extending 1/3 into the enamel
• Spindles: linear extensions of dentinal tubules
• EDJ is a scalloped complex

, Dentin
Dentin Classification
• Primary: mantle + circumpulpal dentin
• Secondary: forms after tooth eruption,
deposited more slowly than primary
• Tertiary: forms in response to trauma
• Predentin: newly formed, unmineralized
matrix of dentin at pulpal border

• Mantle Dentin: just below the EDJ, 150um
thick, composed of large collagen fibres,
less mineralised
• Circumpulpal Dentin: bulk of dentin
below mantle, 6-8mm thick

• Coronal Dentin = crown dentin
• Reticular Dentin = root dentin

Tertiary Dentin
• Fairly irregular in structure
• Reactionary: mild irritation → upregulation of growth factors → mineralisation
• Reparative: strong irritation → odontoblast death → pre-odontoblast differentiation →
upregulation of growth factors → mineralisation

Dentinal Tubules
• Microscopic canals in dentin
• Contains odontoblast processes
• Peritibular Dentin: hyperminalised collar
around dentin tubules
• Intertubular Dentin: main body of dentin
between dentin tubules

Lines Physical Properties
• Von Ebner’s Lines: light-dark paired • Yellowish, resilient, brittle
bands that form due to circadian • 70% mass and 50% volume inorganic
variation in acid-base balance (hydroxyapatite)
• Andresen Lines: long period variation, • 20% mass and 30% volume organic
visibility enhanced by polarised light (collagen fibre)
• Neonatal Line: accentuated contour line • 10% mass and 20% volume water

• Granular Layer of Tomes: hypomineralised area at periphery of root
• Hyaline Layer of Hopewell Smith: thin, clear, structureless layer between granular layer of
Tomes and primary cementum

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

You can quickly pay through credit card for the summaries. There is no membership needed.

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller JunaidAli025. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £3.48. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

67479 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 15 years now

Start selling

Seller

Dental Tissues & Oral Biology Summary Notes for Dentistry (Year 1)